--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/src/java.desktop/share/classes/java/awt/datatransfer/DataFlavor.java Sun Aug 17 15:54:13 2014 +0100
@@ -0,0 +1,1484 @@
+/*
+ * Copyright (c) 1996, 2014, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation. Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+package java.awt.datatransfer;
+
+import sun.awt.datatransfer.DataTransferer;
+import sun.reflect.misc.ReflectUtil;
+
+import java.io.ByteArrayInputStream;
+import java.io.CharArrayReader;
+import java.io.Externalizable;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.io.ObjectInput;
+import java.io.ObjectOutput;
+import java.io.OptionalDataException;
+import java.io.Reader;
+import java.io.StringReader;
+import java.io.UnsupportedEncodingException;
+import java.nio.ByteBuffer;
+import java.nio.CharBuffer;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.Comparator;
+import java.util.Objects;
+
+import static sun.security.util.SecurityConstants.GET_CLASSLOADER_PERMISSION;
+
+/**
+ * A {@code DataFlavor} provides meta information about data. {@code DataFlavor}
+ * is typically used to access data on the clipboard, or during
+ * a drag and drop operation.
+ * <p>
+ * An instance of {@code DataFlavor} encapsulates a content type as
+ * defined in <a href="http://www.ietf.org/rfc/rfc2045.txt">RFC 2045</a>
+ * and <a href="http://www.ietf.org/rfc/rfc2046.txt">RFC 2046</a>.
+ * A content type is typically referred to as a MIME type.
+ * <p>
+ * A content type consists of a media type (referred
+ * to as the primary type), a subtype, and optional parameters. See
+ * <a href="http://www.ietf.org/rfc/rfc2045.txt">RFC 2045</a>
+ * for details on the syntax of a MIME type.
+ * <p>
+ * The JRE data transfer implementation interprets the parameter "class"
+ * of a MIME type as <B>a representation class</b>.
+ * The representation class reflects the class of the object being
+ * transferred. In other words, the representation class is the type of
+ * object returned by {@link Transferable#getTransferData}.
+ * For example, the MIME type of {@link #imageFlavor} is
+ * {@code "image/x-java-image;class=java.awt.Image"},
+ * the primary type is {@code image}, the subtype is
+ * {@code x-java-image}, and the representation class is
+ * {@code java.awt.Image}. When {@code getTransferData} is invoked
+ * with a {@code DataFlavor} of {@code imageFlavor}, an instance of
+ * {@code java.awt.Image} is returned.
+ * It's important to note that {@code DataFlavor} does no error checking
+ * against the representation class. It is up to consumers of
+ * {@code DataFlavor}, such as {@code Transferable}, to honor the representation
+ * class.
+ * <br>
+ * Note, if you do not specify a representation class when
+ * creating a {@code DataFlavor}, the default
+ * representation class is used. See appropriate documentation for
+ * {@code DataFlavor}'s constructors.
+ * <p>
+ * Also, {@code DataFlavor} instances with the "text" primary
+ * MIME type may have a "charset" parameter. Refer to
+ * <a href="http://www.ietf.org/rfc/rfc2046.txt">RFC 2046</a> and
+ * {@link #selectBestTextFlavor} for details on "text" MIME types
+ * and the "charset" parameter.
+ * <p>
+ * Equality of {@code DataFlavors} is determined by the primary type,
+ * subtype, and representation class. Refer to {@link #equals(DataFlavor)} for
+ * details. When determining equality, any optional parameters are ignored.
+ * For example, the following produces two {@code DataFlavors} that
+ * are considered identical:
+ * <pre>
+ * DataFlavor flavor1 = new DataFlavor(Object.class, "X-test/test; class=<java.lang.Object>; foo=bar");
+ * DataFlavor flavor2 = new DataFlavor(Object.class, "X-test/test; class=<java.lang.Object>; x=y");
+ * // The following returns true.
+ * flavor1.equals(flavor2);
+ * </pre>
+ * As mentioned, {@code flavor1} and {@code flavor2} are considered identical.
+ * As such, asking a {@code Transferable} for either {@code DataFlavor} returns
+ * the same results.
+ * <p>
+ * For more information on using data transfer with Swing see
+ * the <a href="http://docs.oracle.com/javase/tutorial/uiswing/dnd/index.html">
+ * How to Use Drag and Drop and Data Transfer</a>,
+ * section in <em>Java Tutorial</em>.
+ *
+ * @author Blake Sullivan
+ * @author Laurence P. G. Cable
+ * @author Jeff Dunn
+ */
+public class DataFlavor implements Externalizable, Cloneable {
+
+ private static final long serialVersionUID = 8367026044764648243L;
+ private static final Class<InputStream> ioInputStreamClass = InputStream.class;
+
+ /**
+ * Tries to load a class from: the bootstrap loader, the system loader,
+ * the context loader (if one is present) and finally the loader specified.
+ *
+ * @param className the name of the class to be loaded
+ * @param fallback the fallback loader
+ * @return the class loaded
+ * @exception ClassNotFoundException if class is not found
+ */
+ protected final static Class<?> tryToLoadClass(String className,
+ ClassLoader fallback)
+ throws ClassNotFoundException
+ {
+ ReflectUtil.checkPackageAccess(className);
+ try {
+ SecurityManager sm = System.getSecurityManager();
+ if (sm != null) {
+ sm.checkPermission(GET_CLASSLOADER_PERMISSION);
+ }
+ ClassLoader loader = ClassLoader.getSystemClassLoader();
+ try {
+ // bootstrap class loader and system class loader if present
+ return Class.forName(className, true, loader);
+ }
+ catch (ClassNotFoundException exception) {
+ // thread context class loader if and only if present
+ loader = Thread.currentThread().getContextClassLoader();
+ if (loader != null) {
+ try {
+ return Class.forName(className, true, loader);
+ }
+ catch (ClassNotFoundException e) {
+ // fallback to user's class loader
+ }
+ }
+ }
+ } catch (SecurityException exception) {
+ // ignore secured class loaders
+ }
+ return Class.forName(className, true, fallback);
+ }
+
+ /*
+ * private initializer
+ */
+ static private DataFlavor createConstant(Class<?> rc, String prn) {
+ try {
+ return new DataFlavor(rc, prn);
+ } catch (Exception e) {
+ return null;
+ }
+ }
+
+ /*
+ * private initializer
+ */
+ static private DataFlavor createConstant(String mt, String prn) {
+ try {
+ return new DataFlavor(mt, prn);
+ } catch (Exception e) {
+ return null;
+ }
+ }
+
+ /*
+ * private initializer
+ */
+ static private DataFlavor initHtmlDataFlavor(String htmlFlavorType) {
+ try {
+ return new DataFlavor ("text/html; class=java.lang.String;document=" +
+ htmlFlavorType + ";charset=Unicode");
+ } catch (Exception e) {
+ return null;
+ }
+ }
+
+ /**
+ * The <code>DataFlavor</code> representing a Java Unicode String class,
+ * where:
+ * <pre>
+ * representationClass = java.lang.String
+ * mimeType = "application/x-java-serialized-object"
+ * </pre>
+ */
+ public static final DataFlavor stringFlavor = createConstant(java.lang.String.class, "Unicode String");
+
+ /**
+ * The <code>DataFlavor</code> representing a Java Image class,
+ * where:
+ * <pre>
+ * representationClass = java.awt.Image
+ * mimeType = "image/x-java-image"
+ * </pre>
+ */
+ public static final DataFlavor imageFlavor = createConstant("image/x-java-image; class=java.awt.Image", "Image");
+
+ /**
+ * The <code>DataFlavor</code> representing plain text with Unicode
+ * encoding, where:
+ * <pre>
+ * representationClass = InputStream
+ * mimeType = "text/plain; charset=unicode"
+ * </pre>
+ * This <code>DataFlavor</code> has been <b>deprecated</b> because
+ * (1) Its representation is an InputStream, an 8-bit based representation,
+ * while Unicode is a 16-bit character set; and (2) The charset "unicode"
+ * is not well-defined. "unicode" implies a particular platform's
+ * implementation of Unicode, not a cross-platform implementation.
+ *
+ * @deprecated as of 1.3. Use <code>DataFlavor.getReaderForText(Transferable)</code>
+ * instead of <code>Transferable.getTransferData(DataFlavor.plainTextFlavor)</code>.
+ */
+ @Deprecated
+ public static final DataFlavor plainTextFlavor = createConstant("text/plain; charset=unicode; class=java.io.InputStream", "Plain Text");
+
+ /**
+ * A MIME Content-Type of application/x-java-serialized-object represents
+ * a graph of Java object(s) that have been made persistent.
+ *
+ * The representation class associated with this <code>DataFlavor</code>
+ * identifies the Java type of an object returned as a reference
+ * from an invocation <code>java.awt.datatransfer.getTransferData</code>.
+ */
+ public static final String javaSerializedObjectMimeType = "application/x-java-serialized-object";
+
+ /**
+ * To transfer a list of files to/from Java (and the underlying
+ * platform) a <code>DataFlavor</code> of this type/subtype and
+ * representation class of <code>java.util.List</code> is used.
+ * Each element of the list is required/guaranteed to be of type
+ * <code>java.io.File</code>.
+ */
+ public static final DataFlavor javaFileListFlavor = createConstant("application/x-java-file-list;class=java.util.List", null);
+
+ /**
+ * To transfer a reference to an arbitrary Java object reference that
+ * has no associated MIME Content-type, across a <code>Transferable</code>
+ * interface WITHIN THE SAME JVM, a <code>DataFlavor</code>
+ * with this type/subtype is used, with a <code>representationClass</code>
+ * equal to the type of the class/interface being passed across the
+ * <code>Transferable</code>.
+ * <p>
+ * The object reference returned from
+ * <code>Transferable.getTransferData</code> for a <code>DataFlavor</code>
+ * with this MIME Content-Type is required to be
+ * an instance of the representation Class of the <code>DataFlavor</code>.
+ */
+ public static final String javaJVMLocalObjectMimeType = "application/x-java-jvm-local-objectref";
+
+ /**
+ * In order to pass a live link to a Remote object via a Drag and Drop
+ * <code>ACTION_LINK</code> operation a Mime Content Type of
+ * application/x-java-remote-object should be used,
+ * where the representation class of the <code>DataFlavor</code>
+ * represents the type of the <code>Remote</code> interface to be
+ * transferred.
+ */
+ public static final String javaRemoteObjectMimeType = "application/x-java-remote-object";
+
+ /**
+ * Represents a piece of an HTML markup. The markup consists of the part
+ * selected on the source side. Therefore some tags in the markup may be
+ * unpaired. If the flavor is used to represent the data in
+ * a {@link Transferable} instance, no additional changes will be made.
+ * This DataFlavor instance represents the same HTML markup as DataFlavor
+ * instances which content MIME type does not contain document parameter
+ * and representation class is the String class.
+ * <pre>
+ * representationClass = String
+ * mimeType = "text/html"
+ * </pre>
+ */
+ public static DataFlavor selectionHtmlFlavor = initHtmlDataFlavor("selection");
+
+ /**
+ * Represents a piece of an HTML markup. If possible, the markup received
+ * from a native system is supplemented with pair tags to be
+ * a well-formed HTML markup. If the flavor is used to represent the data in
+ * a {@link Transferable} instance, no additional changes will be made.
+ * <pre>
+ * representationClass = String
+ * mimeType = "text/html"
+ * </pre>
+ */
+ public static DataFlavor fragmentHtmlFlavor = initHtmlDataFlavor("fragment");
+
+ /**
+ * Represents a piece of an HTML markup. If possible, the markup
+ * received from a native system is supplemented with additional
+ * tags to make up a well-formed HTML document. If the flavor is used to
+ * represent the data in a {@link Transferable} instance,
+ * no additional changes will be made.
+ * <pre>
+ * representationClass = String
+ * mimeType = "text/html"
+ * </pre>
+ */
+ public static DataFlavor allHtmlFlavor = initHtmlDataFlavor("all");
+
+ /**
+ * Constructs a new <code>DataFlavor</code>. This constructor is
+ * provided only for the purpose of supporting the
+ * <code>Externalizable</code> interface. It is not
+ * intended for public (client) use.
+ *
+ * @since 1.2
+ */
+ public DataFlavor() {
+ super();
+ }
+
+ /**
+ * Constructs a fully specified <code>DataFlavor</code>.
+ *
+ * @exception NullPointerException if either <code>primaryType</code>,
+ * <code>subType</code> or <code>representationClass</code> is null
+ */
+ private DataFlavor(String primaryType, String subType, MimeTypeParameterList params, Class<?> representationClass, String humanPresentableName) {
+ super();
+ if (primaryType == null) {
+ throw new NullPointerException("primaryType");
+ }
+ if (subType == null) {
+ throw new NullPointerException("subType");
+ }
+ if (representationClass == null) {
+ throw new NullPointerException("representationClass");
+ }
+
+ if (params == null) params = new MimeTypeParameterList();
+
+ params.set("class", representationClass.getName());
+
+ if (humanPresentableName == null) {
+ humanPresentableName = params.get("humanPresentableName");
+
+ if (humanPresentableName == null)
+ humanPresentableName = primaryType + "/" + subType;
+ }
+
+ try {
+ mimeType = new MimeType(primaryType, subType, params);
+ } catch (MimeTypeParseException mtpe) {
+ throw new IllegalArgumentException("MimeType Parse Exception: " + mtpe.getMessage());
+ }
+
+ this.representationClass = representationClass;
+ this.humanPresentableName = humanPresentableName;
+
+ mimeType.removeParameter("humanPresentableName");
+ }
+
+ /**
+ * Constructs a <code>DataFlavor</code> that represents a Java class.
+ * <p>
+ * The returned <code>DataFlavor</code> will have the following
+ * characteristics:
+ * <pre>
+ * representationClass = representationClass
+ * mimeType = application/x-java-serialized-object
+ * </pre>
+ * @param representationClass the class used to transfer data in this flavor
+ * @param humanPresentableName the human-readable string used to identify
+ * this flavor; if this parameter is <code>null</code>
+ * then the value of the the MIME Content Type is used
+ * @exception NullPointerException if <code>representationClass</code> is null
+ */
+ public DataFlavor(Class<?> representationClass, String humanPresentableName) {
+ this("application", "x-java-serialized-object", null, representationClass, humanPresentableName);
+ if (representationClass == null) {
+ throw new NullPointerException("representationClass");
+ }
+ }
+
+ /**
+ * Constructs a <code>DataFlavor</code> that represents a
+ * <code>MimeType</code>.
+ * <p>
+ * The returned <code>DataFlavor</code> will have the following
+ * characteristics:
+ * <p>
+ * If the <code>mimeType</code> is
+ * "application/x-java-serialized-object; class=<representation class>",
+ * the result is the same as calling
+ * <code>new DataFlavor(Class.forName(<representation class>)</code>.
+ * <p>
+ * Otherwise:
+ * <pre>
+ * representationClass = InputStream
+ * mimeType = mimeType
+ * </pre>
+ * @param mimeType the string used to identify the MIME type for this flavor;
+ * if the <code>mimeType</code> does not specify a
+ * "class=" parameter, or if the class is not successfully
+ * loaded, then an <code>IllegalArgumentException</code>
+ * is thrown
+ * @param humanPresentableName the human-readable string used to identify
+ * this flavor; if this parameter is <code>null</code>
+ * then the value of the the MIME Content Type is used
+ * @exception IllegalArgumentException if <code>mimeType</code> is
+ * invalid or if the class is not successfully loaded
+ * @exception NullPointerException if <code>mimeType</code> is null
+ */
+ public DataFlavor(String mimeType, String humanPresentableName) {
+ super();
+ if (mimeType == null) {
+ throw new NullPointerException("mimeType");
+ }
+ try {
+ initialize(mimeType, humanPresentableName, this.getClass().getClassLoader());
+ } catch (MimeTypeParseException mtpe) {
+ throw new IllegalArgumentException("failed to parse:" + mimeType);
+ } catch (ClassNotFoundException cnfe) {
+ throw new IllegalArgumentException("can't find specified class: " + cnfe.getMessage());
+ }
+ }
+
+ /**
+ * Constructs a <code>DataFlavor</code> that represents a
+ * <code>MimeType</code>.
+ * <p>
+ * The returned <code>DataFlavor</code> will have the following
+ * characteristics:
+ * <p>
+ * If the mimeType is
+ * "application/x-java-serialized-object; class=<representation class>",
+ * the result is the same as calling
+ * <code>new DataFlavor(Class.forName(<representation class>)</code>.
+ * <p>
+ * Otherwise:
+ * <pre>
+ * representationClass = InputStream
+ * mimeType = mimeType
+ * </pre>
+ * @param mimeType the string used to identify the MIME type for this flavor
+ * @param humanPresentableName the human-readable string used to
+ * identify this flavor
+ * @param classLoader the class loader to use
+ * @exception ClassNotFoundException if the class is not loaded
+ * @exception IllegalArgumentException if <code>mimeType</code> is
+ * invalid
+ * @exception NullPointerException if <code>mimeType</code> is null
+ */
+ public DataFlavor(String mimeType, String humanPresentableName, ClassLoader classLoader) throws ClassNotFoundException {
+ super();
+ if (mimeType == null) {
+ throw new NullPointerException("mimeType");
+ }
+ try {
+ initialize(mimeType, humanPresentableName, classLoader);
+ } catch (MimeTypeParseException mtpe) {
+ throw new IllegalArgumentException("failed to parse:" + mimeType);
+ }
+ }
+
+ /**
+ * Constructs a <code>DataFlavor</code> from a <code>mimeType</code> string.
+ * The string can specify a "class=<fully specified Java class name>"
+ * parameter to create a <code>DataFlavor</code> with the desired
+ * representation class. If the string does not contain "class=" parameter,
+ * <code>java.io.InputStream</code> is used as default.
+ *
+ * @param mimeType the string used to identify the MIME type for this flavor;
+ * if the class specified by "class=" parameter is not
+ * successfully loaded, then an
+ * <code>ClassNotFoundException</code> is thrown
+ * @exception ClassNotFoundException if the class is not loaded
+ * @exception IllegalArgumentException if <code>mimeType</code> is
+ * invalid
+ * @exception NullPointerException if <code>mimeType</code> is null
+ */
+ public DataFlavor(String mimeType) throws ClassNotFoundException {
+ super();
+ if (mimeType == null) {
+ throw new NullPointerException("mimeType");
+ }
+ try {
+ initialize(mimeType, null, this.getClass().getClassLoader());
+ } catch (MimeTypeParseException mtpe) {
+ throw new IllegalArgumentException("failed to parse:" + mimeType);
+ }
+ }
+
+ /**
+ * Common initialization code called from various constructors.
+ *
+ * @param mimeType the MIME Content Type (must have a class= param)
+ * @param humanPresentableName the human Presentable Name or
+ * <code>null</code>
+ * @param classLoader the fallback class loader to resolve against
+ *
+ * @throws MimeTypeParseException
+ * @throws ClassNotFoundException
+ * @throws NullPointerException if <code>mimeType</code> is null
+ *
+ * @see #tryToLoadClass
+ */
+ private void initialize(String mimeType, String humanPresentableName, ClassLoader classLoader) throws MimeTypeParseException, ClassNotFoundException {
+ if (mimeType == null) {
+ throw new NullPointerException("mimeType");
+ }
+
+ this.mimeType = new MimeType(mimeType); // throws
+
+ String rcn = getParameter("class");
+
+ if (rcn == null) {
+ if ("application/x-java-serialized-object".equals(this.mimeType.getBaseType()))
+
+ throw new IllegalArgumentException("no representation class specified for:" + mimeType);
+ else
+ representationClass = java.io.InputStream.class; // default
+ } else { // got a class name
+ representationClass = DataFlavor.tryToLoadClass(rcn, classLoader);
+ }
+
+ this.mimeType.setParameter("class", representationClass.getName());
+
+ if (humanPresentableName == null) {
+ humanPresentableName = this.mimeType.getParameter("humanPresentableName");
+ if (humanPresentableName == null)
+ humanPresentableName = this.mimeType.getPrimaryType() + "/" + this.mimeType.getSubType();
+ }
+
+ this.humanPresentableName = humanPresentableName; // set it.
+
+ this.mimeType.removeParameter("humanPresentableName"); // just in case
+ }
+
+ /**
+ * String representation of this <code>DataFlavor</code> and its
+ * parameters. The resulting <code>String</code> contains the name of
+ * the <code>DataFlavor</code> class, this flavor's MIME type, and its
+ * representation class. If this flavor has a primary MIME type of "text",
+ * supports the charset parameter, and has an encoded representation, the
+ * flavor's charset is also included. See <code>selectBestTextFlavor</code>
+ * for a list of text flavors which support the charset parameter.
+ *
+ * @return string representation of this <code>DataFlavor</code>
+ * @see #selectBestTextFlavor
+ */
+ public String toString() {
+ String string = getClass().getName();
+ string += "["+paramString()+"]";
+ return string;
+ }
+
+ private String paramString() {
+ String params = "";
+ params += "mimetype=";
+ if (mimeType == null) {
+ params += "null";
+ } else {
+ params += mimeType.getBaseType();
+ }
+ params += ";representationclass=";
+ if (representationClass == null) {
+ params += "null";
+ } else {
+ params += representationClass.getName();
+ }
+ if (DataTransferer.isFlavorCharsetTextType(this) &&
+ (isRepresentationClassInputStream() ||
+ isRepresentationClassByteBuffer() ||
+ byte[].class.equals(representationClass)))
+ {
+ params += ";charset=" + DataTransferer.getTextCharset(this);
+ }
+ return params;
+ }
+
+ /**
+ * Returns a <code>DataFlavor</code> representing plain text with Unicode
+ * encoding, where:
+ * <pre>
+ * representationClass = java.io.InputStream
+ * mimeType = "text/plain;
+ * charset=<platform default Unicode encoding>"
+ * </pre>
+ * Sun's implementation for Microsoft Windows uses the encoding <code>utf-16le</code>.
+ * Sun's implementation for Solaris and Linux uses the encoding
+ * <code>iso-10646-ucs-2</code>.
+ *
+ * @return a <code>DataFlavor</code> representing plain text
+ * with Unicode encoding
+ * @since 1.3
+ */
+ public static final DataFlavor getTextPlainUnicodeFlavor() {
+ String encoding = null;
+ DataTransferer transferer = DataTransferer.getInstance();
+ if (transferer != null) {
+ encoding = transferer.getDefaultUnicodeEncoding();
+ }
+ return new DataFlavor(
+ "text/plain;charset="+encoding
+ +";class=java.io.InputStream", "Plain Text");
+ }
+
+ /**
+ * Selects the best text <code>DataFlavor</code> from an array of <code>
+ * DataFlavor</code>s. Only <code>DataFlavor.stringFlavor</code>, and
+ * equivalent flavors, and flavors that have a primary MIME type of "text",
+ * are considered for selection.
+ * <p>
+ * Flavors are first sorted by their MIME types in the following order:
+ * <ul>
+ * <li>"text/sgml"
+ * <li>"text/xml"
+ * <li>"text/html"
+ * <li>"text/rtf"
+ * <li>"text/enriched"
+ * <li>"text/richtext"
+ * <li>"text/uri-list"
+ * <li>"text/tab-separated-values"
+ * <li>"text/t140"
+ * <li>"text/rfc822-headers"
+ * <li>"text/parityfec"
+ * <li>"text/directory"
+ * <li>"text/css"
+ * <li>"text/calendar"
+ * <li>"application/x-java-serialized-object"
+ * <li>"text/plain"
+ * <li>"text/<other>"
+ * </ul>
+ * <p>For example, "text/sgml" will be selected over
+ * "text/html", and <code>DataFlavor.stringFlavor</code> will be chosen
+ * over <code>DataFlavor.plainTextFlavor</code>.
+ * <p>
+ * If two or more flavors share the best MIME type in the array, then that
+ * MIME type will be checked to see if it supports the charset parameter.
+ * <p>
+ * The following MIME types support, or are treated as though they support,
+ * the charset parameter:
+ * <ul>
+ * <li>"text/sgml"
+ * <li>"text/xml"
+ * <li>"text/html"
+ * <li>"text/enriched"
+ * <li>"text/richtext"
+ * <li>"text/uri-list"
+ * <li>"text/directory"
+ * <li>"text/css"
+ * <li>"text/calendar"
+ * <li>"application/x-java-serialized-object"
+ * <li>"text/plain"
+ * </ul>
+ * The following MIME types do not support, or are treated as though they
+ * do not support, the charset parameter:
+ * <ul>
+ * <li>"text/rtf"
+ * <li>"text/tab-separated-values"
+ * <li>"text/t140"
+ * <li>"text/rfc822-headers"
+ * <li>"text/parityfec"
+ * </ul>
+ * For "text/<other>" MIME types, the first time the JRE needs to
+ * determine whether the MIME type supports the charset parameter, it will
+ * check whether the parameter is explicitly listed in an arbitrarily
+ * chosen <code>DataFlavor</code> which uses that MIME type. If so, the JRE
+ * will assume from that point on that the MIME type supports the charset
+ * parameter and will not check again. If the parameter is not explicitly
+ * listed, the JRE will assume from that point on that the MIME type does
+ * not support the charset parameter and will not check again. Because
+ * this check is performed on an arbitrarily chosen
+ * <code>DataFlavor</code>, developers must ensure that all
+ * <code>DataFlavor</code>s with a "text/<other>" MIME type specify
+ * the charset parameter if it is supported by that MIME type. Developers
+ * should never rely on the JRE to substitute the platform's default
+ * charset for a "text/<other>" DataFlavor. Failure to adhere to this
+ * restriction will lead to undefined behavior.
+ * <p>
+ * If the best MIME type in the array does not support the charset
+ * parameter, the flavors which share that MIME type will then be sorted by
+ * their representation classes in the following order:
+ * <code>java.io.InputStream</code>, <code>java.nio.ByteBuffer</code>,
+ * <code>[B</code>, <all others>.
+ * <p>
+ * If two or more flavors share the best representation class, or if no
+ * flavor has one of the three specified representations, then one of those
+ * flavors will be chosen non-deterministically.
+ * <p>
+ * If the best MIME type in the array does support the charset parameter,
+ * the flavors which share that MIME type will then be sorted by their
+ * representation classes in the following order:
+ * <code>java.io.Reader</code>, <code>java.lang.String</code>,
+ * <code>java.nio.CharBuffer</code>, <code>[C</code>, <all others>.
+ * <p>
+ * If two or more flavors share the best representation class, and that
+ * representation is one of the four explicitly listed, then one of those
+ * flavors will be chosen non-deterministically. If, however, no flavor has
+ * one of the four specified representations, the flavors will then be
+ * sorted by their charsets. Unicode charsets, such as "UTF-16", "UTF-8",
+ * "UTF-16BE", "UTF-16LE", and their aliases, are considered best. After
+ * them, the platform default charset and its aliases are selected.
+ * "US-ASCII" and its aliases are worst. All other charsets are chosen in
+ * alphabetical order, but only charsets supported by this implementation
+ * of the Java platform will be considered.
+ * <p>
+ * If two or more flavors share the best charset, the flavors will then
+ * again be sorted by their representation classes in the following order:
+ * <code>java.io.InputStream</code>, <code>java.nio.ByteBuffer</code>,
+ * <code>[B</code>, <all others>.
+ * <p>
+ * If two or more flavors share the best representation class, or if no
+ * flavor has one of the three specified representations, then one of those
+ * flavors will be chosen non-deterministically.
+ *
+ * @param availableFlavors an array of available <code>DataFlavor</code>s
+ * @return the best (highest fidelity) flavor according to the rules
+ * specified above, or <code>null</code>,
+ * if <code>availableFlavors</code> is <code>null</code>,
+ * has zero length, or contains no text flavors
+ * @since 1.3
+ */
+ public static final DataFlavor selectBestTextFlavor(
+ DataFlavor[] availableFlavors) {
+ if (availableFlavors == null || availableFlavors.length == 0) {
+ return null;
+ }
+
+ if (textFlavorComparator == null) {
+ textFlavorComparator = new TextFlavorComparator();
+ }
+
+ DataFlavor bestFlavor = Collections.max(Arrays.asList(availableFlavors),
+ textFlavorComparator);
+
+ if (!bestFlavor.isFlavorTextType()) {
+ return null;
+ }
+
+ return bestFlavor;
+ }
+
+ private static Comparator<DataFlavor> textFlavorComparator;
+
+ static class TextFlavorComparator
+ extends DataTransferer.DataFlavorComparator {
+
+ /**
+ * Compares two <code>DataFlavor</code> objects. Returns a negative
+ * integer, zero, or a positive integer as the first
+ * <code>DataFlavor</code> is worse than, equal to, or better than the
+ * second.
+ * <p>
+ * <code>DataFlavor</code>s are ordered according to the rules outlined
+ * for <code>selectBestTextFlavor</code>.
+ *
+ * @param flavor1 the first <code>DataFlavor</code> to be compared
+ * @param flavor2 the second <code>DataFlavor</code> to be compared
+ * @return a negative integer, zero, or a positive integer as the first
+ * argument is worse, equal to, or better than the second
+ * @throws ClassCastException if either of the arguments is not an
+ * instance of <code>DataFlavor</code>
+ * @throws NullPointerException if either of the arguments is
+ * <code>null</code>
+ *
+ * @see #selectBestTextFlavor
+ */
+ public int compare(DataFlavor flavor1, DataFlavor flavor2) {
+ if (flavor1.isFlavorTextType()) {
+ if (flavor2.isFlavorTextType()) {
+ return super.compare(flavor1, flavor2);
+ } else {
+ return 1;
+ }
+ } else if (flavor2.isFlavorTextType()) {
+ return -1;
+ } else {
+ return 0;
+ }
+ }
+ }
+
+ /**
+ * Gets a Reader for a text flavor, decoded, if necessary, for the expected
+ * charset (encoding). The supported representation classes are
+ * <code>java.io.Reader</code>, <code>java.lang.String</code>,
+ * <code>java.nio.CharBuffer</code>, <code>[C</code>,
+ * <code>java.io.InputStream</code>, <code>java.nio.ByteBuffer</code>,
+ * and <code>[B</code>.
+ * <p>
+ * Because text flavors which do not support the charset parameter are
+ * encoded in a non-standard format, this method should not be called for
+ * such flavors. However, in order to maintain backward-compatibility,
+ * if this method is called for such a flavor, this method will treat the
+ * flavor as though it supports the charset parameter and attempt to
+ * decode it accordingly. See <code>selectBestTextFlavor</code> for a list
+ * of text flavors which do not support the charset parameter.
+ *
+ * @param transferable the <code>Transferable</code> whose data will be
+ * requested in this flavor
+ *
+ * @return a <code>Reader</code> to read the <code>Transferable</code>'s
+ * data
+ *
+ * @exception IllegalArgumentException if the representation class
+ * is not one of the seven listed above
+ * @exception IllegalArgumentException if the <code>Transferable</code>
+ * has <code>null</code> data
+ * @exception NullPointerException if the <code>Transferable</code> is
+ * <code>null</code>
+ * @exception UnsupportedEncodingException if this flavor's representation
+ * is <code>java.io.InputStream</code>,
+ * <code>java.nio.ByteBuffer</code>, or <code>[B</code> and
+ * this flavor's encoding is not supported by this
+ * implementation of the Java platform
+ * @exception UnsupportedFlavorException if the <code>Transferable</code>
+ * does not support this flavor
+ * @exception IOException if the data cannot be read because of an
+ * I/O error
+ * @see #selectBestTextFlavor
+ * @since 1.3
+ */
+ public Reader getReaderForText(Transferable transferable)
+ throws UnsupportedFlavorException, IOException
+ {
+ Object transferObject = transferable.getTransferData(this);
+ if (transferObject == null) {
+ throw new IllegalArgumentException
+ ("getTransferData() returned null");
+ }
+
+ if (transferObject instanceof Reader) {
+ return (Reader)transferObject;
+ } else if (transferObject instanceof String) {
+ return new StringReader((String)transferObject);
+ } else if (transferObject instanceof CharBuffer) {
+ CharBuffer buffer = (CharBuffer)transferObject;
+ int size = buffer.remaining();
+ char[] chars = new char[size];
+ buffer.get(chars, 0, size);
+ return new CharArrayReader(chars);
+ } else if (transferObject instanceof char[]) {
+ return new CharArrayReader((char[])transferObject);
+ }
+
+ InputStream stream = null;
+
+ if (transferObject instanceof InputStream) {
+ stream = (InputStream)transferObject;
+ } else if (transferObject instanceof ByteBuffer) {
+ ByteBuffer buffer = (ByteBuffer)transferObject;
+ int size = buffer.remaining();
+ byte[] bytes = new byte[size];
+ buffer.get(bytes, 0, size);
+ stream = new ByteArrayInputStream(bytes);
+ } else if (transferObject instanceof byte[]) {
+ stream = new ByteArrayInputStream((byte[])transferObject);
+ }
+
+ if (stream == null) {
+ throw new IllegalArgumentException("transfer data is not Reader, String, CharBuffer, char array, InputStream, ByteBuffer, or byte array");
+ }
+
+ String encoding = getParameter("charset");
+ return (encoding == null)
+ ? new InputStreamReader(stream)
+ : new InputStreamReader(stream, encoding);
+ }
+
+ /**
+ * Returns the MIME type string for this <code>DataFlavor</code>.
+ * @return the MIME type string for this flavor
+ */
+ public String getMimeType() {
+ return (mimeType != null) ? mimeType.toString() : null;
+ }
+
+ /**
+ * Returns the <code>Class</code> which objects supporting this
+ * <code>DataFlavor</code> will return when this <code>DataFlavor</code>
+ * is requested.
+ * @return the <code>Class</code> which objects supporting this
+ * <code>DataFlavor</code> will return when this <code>DataFlavor</code>
+ * is requested
+ */
+ public Class<?> getRepresentationClass() {
+ return representationClass;
+ }
+
+ /**
+ * Returns the human presentable name for the data format that this
+ * <code>DataFlavor</code> represents. This name would be localized
+ * for different countries.
+ * @return the human presentable name for the data format that this
+ * <code>DataFlavor</code> represents
+ */
+ public String getHumanPresentableName() {
+ return humanPresentableName;
+ }
+
+ /**
+ * Returns the primary MIME type for this <code>DataFlavor</code>.
+ * @return the primary MIME type of this <code>DataFlavor</code>
+ */
+ public String getPrimaryType() {
+ return (mimeType != null) ? mimeType.getPrimaryType() : null;
+ }
+
+ /**
+ * Returns the sub MIME type of this <code>DataFlavor</code>.
+ * @return the Sub MIME type of this <code>DataFlavor</code>
+ */
+ public String getSubType() {
+ return (mimeType != null) ? mimeType.getSubType() : null;
+ }
+
+ /**
+ * Returns the human presentable name for this <code>DataFlavor</code>
+ * if <code>paramName</code> equals "humanPresentableName". Otherwise
+ * returns the MIME type value associated with <code>paramName</code>.
+ *
+ * @param paramName the parameter name requested
+ * @return the value of the name parameter, or <code>null</code>
+ * if there is no associated value
+ */
+ public String getParameter(String paramName) {
+ if (paramName.equals("humanPresentableName")) {
+ return humanPresentableName;
+ } else {
+ return (mimeType != null)
+ ? mimeType.getParameter(paramName) : null;
+ }
+ }
+
+ /**
+ * Sets the human presentable name for the data format that this
+ * <code>DataFlavor</code> represents. This name would be localized
+ * for different countries.
+ * @param humanPresentableName the new human presentable name
+ */
+ public void setHumanPresentableName(String humanPresentableName) {
+ this.humanPresentableName = humanPresentableName;
+ }
+
+ /**
+ * {@inheritDoc}
+ * <p>
+ * The equals comparison for the {@code DataFlavor} class is implemented
+ * as follows: Two <code>DataFlavor</code>s are considered equal if and
+ * only if their MIME primary type and subtype and representation class are
+ * equal. Additionally, if the primary type is "text", the subtype denotes
+ * a text flavor which supports the charset parameter, and the
+ * representation class is not <code>java.io.Reader</code>,
+ * <code>java.lang.String</code>, <code>java.nio.CharBuffer</code>, or
+ * <code>[C</code>, the <code>charset</code> parameter must also be equal.
+ * If a charset is not explicitly specified for one or both
+ * <code>DataFlavor</code>s, the platform default encoding is assumed. See
+ * <code>selectBestTextFlavor</code> for a list of text flavors which
+ * support the charset parameter.
+ *
+ * @param o the <code>Object</code> to compare with <code>this</code>
+ * @return <code>true</code> if <code>that</code> is equivalent to this
+ * <code>DataFlavor</code>; <code>false</code> otherwise
+ * @see #selectBestTextFlavor
+ */
+ public boolean equals(Object o) {
+ return ((o instanceof DataFlavor) && equals((DataFlavor)o));
+ }
+
+ /**
+ * This method has the same behavior as {@link #equals(Object)}.
+ * The only difference being that it takes a {@code DataFlavor} instance
+ * as a parameter.
+ *
+ * @param that the <code>DataFlavor</code> to compare with
+ * <code>this</code>
+ * @return <code>true</code> if <code>that</code> is equivalent to this
+ * <code>DataFlavor</code>; <code>false</code> otherwise
+ * @see #selectBestTextFlavor
+ */
+ public boolean equals(DataFlavor that) {
+ if (that == null) {
+ return false;
+ }
+ if (this == that) {
+ return true;
+ }
+
+ if (!Objects.equals(this.getRepresentationClass(), that.getRepresentationClass())) {
+ return false;
+ }
+
+ if (mimeType == null) {
+ if (that.mimeType != null) {
+ return false;
+ }
+ } else {
+ if (!mimeType.match(that.mimeType)) {
+ return false;
+ }
+
+ if ("text".equals(getPrimaryType())) {
+ if (DataTransferer.doesSubtypeSupportCharset(this)
+ && representationClass != null
+ && !isStandardTextRepresentationClass()) {
+ String thisCharset =
+ DataTransferer.canonicalName(this.getParameter("charset"));
+ String thatCharset =
+ DataTransferer.canonicalName(that.getParameter("charset"));
+ if (!Objects.equals(thisCharset, thatCharset)) {
+ return false;
+ }
+ }
+
+ if ("html".equals(getSubType())) {
+ String thisDocument = this.getParameter("document");
+ String thatDocument = that.getParameter("document");
+ if (!Objects.equals(thisDocument, thatDocument)) {
+ return false;
+ }
+ }
+ }
+ }
+
+ return true;
+ }
+
+ /**
+ * Compares only the <code>mimeType</code> against the passed in
+ * <code>String</code> and <code>representationClass</code> is
+ * not considered in the comparison.
+ *
+ * If <code>representationClass</code> needs to be compared, then
+ * <code>equals(new DataFlavor(s))</code> may be used.
+ * @deprecated As inconsistent with <code>hashCode()</code> contract,
+ * use <code>isMimeTypeEqual(String)</code> instead.
+ * @param s the {@code mimeType} to compare.
+ * @return true if the String (MimeType) is equal; false otherwise or if
+ * {@code s} is {@code null}
+ */
+ @Deprecated
+ public boolean equals(String s) {
+ if (s == null || mimeType == null)
+ return false;
+ return isMimeTypeEqual(s);
+ }
+
+ /**
+ * Returns hash code for this <code>DataFlavor</code>.
+ * For two equal <code>DataFlavor</code>s, hash codes are equal.
+ * For the <code>String</code>
+ * that matches <code>DataFlavor.equals(String)</code>, it is not
+ * guaranteed that <code>DataFlavor</code>'s hash code is equal
+ * to the hash code of the <code>String</code>.
+ *
+ * @return a hash code for this <code>DataFlavor</code>
+ */
+ public int hashCode() {
+ int total = 0;
+
+ if (representationClass != null) {
+ total += representationClass.hashCode();
+ }
+
+ if (mimeType != null) {
+ String primaryType = mimeType.getPrimaryType();
+ if (primaryType != null) {
+ total += primaryType.hashCode();
+ }
+
+ // Do not add subType.hashCode() to the total. equals uses
+ // MimeType.match which reports a match if one or both of the
+ // subTypes is '*', regardless of the other subType.
+
+ if ("text".equals(primaryType)) {
+ if (DataTransferer.doesSubtypeSupportCharset(this)
+ && representationClass != null
+ && !isStandardTextRepresentationClass()) {
+ String charset = DataTransferer.canonicalName(getParameter("charset"));
+ if (charset != null) {
+ total += charset.hashCode();
+ }
+ }
+
+ if ("html".equals(getSubType())) {
+ String document = this.getParameter("document");
+ if (document != null) {
+ total += document.hashCode();
+ }
+ }
+ }
+ }
+
+ return total;
+ }
+
+ /**
+ * Identical to {@link #equals(DataFlavor)}.
+ *
+ * @param that the <code>DataFlavor</code> to compare with
+ * <code>this</code>
+ * @return <code>true</code> if <code>that</code> is equivalent to this
+ * <code>DataFlavor</code>; <code>false</code> otherwise
+ * @see #selectBestTextFlavor
+ * @since 1.3
+ */
+ public boolean match(DataFlavor that) {
+ return equals(that);
+ }
+
+ /**
+ * Returns whether the string representation of the MIME type passed in
+ * is equivalent to the MIME type of this <code>DataFlavor</code>.
+ * Parameters are not included in the comparison.
+ *
+ * @param mimeType the string representation of the MIME type
+ * @return true if the string representation of the MIME type passed in is
+ * equivalent to the MIME type of this <code>DataFlavor</code>;
+ * false otherwise
+ * @throws NullPointerException if mimeType is <code>null</code>
+ */
+ public boolean isMimeTypeEqual(String mimeType) {
+ // JCK Test DataFlavor0117: if 'mimeType' is null, throw NPE
+ if (mimeType == null) {
+ throw new NullPointerException("mimeType");
+ }
+ if (this.mimeType == null) {
+ return false;
+ }
+ try {
+ return this.mimeType.match(new MimeType(mimeType));
+ } catch (MimeTypeParseException mtpe) {
+ return false;
+ }
+ }
+
+ /**
+ * Compares the <code>mimeType</code> of two <code>DataFlavor</code>
+ * objects. No parameters are considered.
+ *
+ * @param dataFlavor the <code>DataFlavor</code> to be compared
+ * @return true if the <code>MimeType</code>s are equal,
+ * otherwise false
+ */
+
+ public final boolean isMimeTypeEqual(DataFlavor dataFlavor) {
+ return isMimeTypeEqual(dataFlavor.mimeType);
+ }
+
+ /**
+ * Compares the <code>mimeType</code> of two <code>DataFlavor</code>
+ * objects. No parameters are considered.
+ *
+ * @return true if the <code>MimeType</code>s are equal,
+ * otherwise false
+ */
+
+ private boolean isMimeTypeEqual(MimeType mtype) {
+ if (this.mimeType == null) {
+ return (mtype == null);
+ }
+ return mimeType.match(mtype);
+ }
+
+ /**
+ * Checks if the representation class is one of the standard text
+ * representation classes.
+ *
+ * @return true if the representation class is one of the standard text
+ * representation classes, otherwise false
+ */
+ private boolean isStandardTextRepresentationClass() {
+ return isRepresentationClassReader()
+ || String.class.equals(representationClass)
+ || isRepresentationClassCharBuffer()
+ || char[].class.equals(representationClass);
+ }
+
+ /**
+ * Does the <code>DataFlavor</code> represent a serialized object?
+ * @return whether or not a serialized object is represented
+ */
+ public boolean isMimeTypeSerializedObject() {
+ return isMimeTypeEqual(javaSerializedObjectMimeType);
+ }
+
+ /**
+ * Returns the default representation class.
+ * @return the default representation class
+ */
+ public final Class<?> getDefaultRepresentationClass() {
+ return ioInputStreamClass;
+ }
+
+ /**
+ * Returns the name of the default representation class.
+ * @return the name of the default representation class
+ */
+ public final String getDefaultRepresentationClassAsString() {
+ return getDefaultRepresentationClass().getName();
+ }
+
+ /**
+ * Does the <code>DataFlavor</code> represent a
+ * <code>java.io.InputStream</code>?
+ * @return whether or not this {@code DataFlavor} represent a
+ * {@code java.io.InputStream}
+ */
+ public boolean isRepresentationClassInputStream() {
+ return ioInputStreamClass.isAssignableFrom(representationClass);
+ }
+
+ /**
+ * Returns whether the representation class for this
+ * <code>DataFlavor</code> is <code>java.io.Reader</code> or a subclass
+ * thereof.
+ * @return whether or not the representation class for this
+ * {@code DataFlavor} is {@code java.io.Reader} or a subclass
+ * thereof
+ *
+ * @since 1.4
+ */
+ public boolean isRepresentationClassReader() {
+ return java.io.Reader.class.isAssignableFrom(representationClass);
+ }
+
+ /**
+ * Returns whether the representation class for this
+ * <code>DataFlavor</code> is <code>java.nio.CharBuffer</code> or a
+ * subclass thereof.
+ * @return whether or not the representation class for this
+ * {@code DataFlavor} is {@code java.nio.CharBuffer} or a subclass
+ * thereof
+ *
+ * @since 1.4
+ */
+ public boolean isRepresentationClassCharBuffer() {
+ return java.nio.CharBuffer.class.isAssignableFrom(representationClass);
+ }
+
+ /**
+ * Returns whether the representation class for this
+ * <code>DataFlavor</code> is <code>java.nio.ByteBuffer</code> or a
+ * subclass thereof.
+ * @return whether or not the representation class for this
+ * {@code DataFlavor} is {@code java.nio.ByteBuffer} or a subclass
+ * thereof
+ *
+ * @since 1.4
+ */
+ public boolean isRepresentationClassByteBuffer() {
+ return java.nio.ByteBuffer.class.isAssignableFrom(representationClass);
+ }
+
+ /**
+ * Returns true if the representation class can be serialized.
+ * @return true if the representation class can be serialized
+ */
+
+ public boolean isRepresentationClassSerializable() {
+ return java.io.Serializable.class.isAssignableFrom(representationClass);
+ }
+
+ /**
+ * Returns true if the representation class is <code>Remote</code>.
+ * @return true if the representation class is <code>Remote</code>
+ */
+
+ public boolean isRepresentationClassRemote() {
+ return DataTransferer.isRemote(representationClass);
+ }
+
+ /**
+ * Returns true if the <code>DataFlavor</code> specified represents
+ * a serialized object.
+ * @return true if the <code>DataFlavor</code> specified represents
+ * a Serialized Object
+ */
+
+ public boolean isFlavorSerializedObjectType() {
+ return isRepresentationClassSerializable() && isMimeTypeEqual(javaSerializedObjectMimeType);
+ }
+
+ /**
+ * Returns true if the <code>DataFlavor</code> specified represents
+ * a remote object.
+ * @return true if the <code>DataFlavor</code> specified represents
+ * a Remote Object
+ */
+
+ public boolean isFlavorRemoteObjectType() {
+ return isRepresentationClassRemote()
+ && isRepresentationClassSerializable()
+ && isMimeTypeEqual(javaRemoteObjectMimeType);
+ }
+
+
+ /**
+ * Returns true if the <code>DataFlavor</code> specified represents
+ * a list of file objects.
+ * @return true if the <code>DataFlavor</code> specified represents
+ * a List of File objects
+ */
+
+ public boolean isFlavorJavaFileListType() {
+ if (mimeType == null || representationClass == null)
+ return false;
+ return java.util.List.class.isAssignableFrom(representationClass) &&
+ mimeType.match(javaFileListFlavor.mimeType);
+
+ }
+
+ /**
+ * Returns whether this <code>DataFlavor</code> is a valid text flavor for
+ * this implementation of the Java platform. Only flavors equivalent to
+ * <code>DataFlavor.stringFlavor</code> and <code>DataFlavor</code>s with
+ * a primary MIME type of "text" can be valid text flavors.
+ * <p>
+ * If this flavor supports the charset parameter, it must be equivalent to
+ * <code>DataFlavor.stringFlavor</code>, or its representation must be
+ * <code>java.io.Reader</code>, <code>java.lang.String</code>,
+ * <code>java.nio.CharBuffer</code>, <code>[C</code>,
+ * <code>java.io.InputStream</code>, <code>java.nio.ByteBuffer</code>, or
+ * <code>[B</code>. If the representation is
+ * <code>java.io.InputStream</code>, <code>java.nio.ByteBuffer</code>, or
+ * <code>[B</code>, then this flavor's <code>charset</code> parameter must
+ * be supported by this implementation of the Java platform. If a charset
+ * is not specified, then the platform default charset, which is always
+ * supported, is assumed.
+ * <p>
+ * If this flavor does not support the charset parameter, its
+ * representation must be <code>java.io.InputStream</code>,
+ * <code>java.nio.ByteBuffer</code>, or <code>[B</code>.
+ * <p>
+ * See <code>selectBestTextFlavor</code> for a list of text flavors which
+ * support the charset parameter.
+ *
+ * @return <code>true</code> if this <code>DataFlavor</code> is a valid
+ * text flavor as described above; <code>false</code> otherwise
+ * @see #selectBestTextFlavor
+ * @since 1.4
+ */
+ public boolean isFlavorTextType() {
+ return (DataTransferer.isFlavorCharsetTextType(this) ||
+ DataTransferer.isFlavorNoncharsetTextType(this));
+ }
+
+ /**
+ * Serializes this <code>DataFlavor</code>.
+ */
+
+ public synchronized void writeExternal(ObjectOutput os) throws IOException {
+ if (mimeType != null) {
+ mimeType.setParameter("humanPresentableName", humanPresentableName);
+ os.writeObject(mimeType);
+ mimeType.removeParameter("humanPresentableName");
+ } else {
+ os.writeObject(null);
+ }
+
+ os.writeObject(representationClass);
+ }
+
+ /**
+ * Restores this <code>DataFlavor</code> from a Serialized state.
+ */
+
+ public synchronized void readExternal(ObjectInput is) throws IOException , ClassNotFoundException {
+ String rcn = null;
+ mimeType = (MimeType)is.readObject();
+
+ if (mimeType != null) {
+ humanPresentableName =
+ mimeType.getParameter("humanPresentableName");
+ mimeType.removeParameter("humanPresentableName");
+ rcn = mimeType.getParameter("class");
+ if (rcn == null) {
+ throw new IOException("no class parameter specified in: " +
+ mimeType);
+ }
+ }
+
+ try {
+ representationClass = (Class)is.readObject();
+ } catch (OptionalDataException ode) {
+ if (!ode.eof || ode.length != 0) {
+ throw ode;
+ }
+ // Ensure backward compatibility.
+ // Old versions didn't write the representation class to the stream.
+ if (rcn != null) {
+ representationClass =
+ DataFlavor.tryToLoadClass(rcn, getClass().getClassLoader());
+ }
+ }
+ }
+
+ /**
+ * Returns a clone of this <code>DataFlavor</code>.
+ * @return a clone of this <code>DataFlavor</code>
+ */
+
+ public Object clone() throws CloneNotSupportedException {
+ Object newObj = super.clone();
+ if (mimeType != null) {
+ ((DataFlavor)newObj).mimeType = (MimeType)mimeType.clone();
+ }
+ return newObj;
+ } // clone()
+
+ /**
+ * Called on <code>DataFlavor</code> for every MIME Type parameter
+ * to allow <code>DataFlavor</code> subclasses to handle special
+ * parameters like the text/plain <code>charset</code>
+ * parameters, whose values are case insensitive. (MIME type parameter
+ * values are supposed to be case sensitive.
+ * <p>
+ * This method is called for each parameter name/value pair and should
+ * return the normalized representation of the <code>parameterValue</code>.
+ *
+ * This method is never invoked by this implementation from 1.1 onwards.
+ *
+ * @param parameterName the parameter name
+ * @param parameterValue the parameter value
+ * @return the parameter value
+ * @deprecated
+ */
+ @Deprecated
+ protected String normalizeMimeTypeParameter(String parameterName, String parameterValue) {
+ return parameterValue;
+ }
+
+ /**
+ * Called for each MIME type string to give <code>DataFlavor</code> subtypes
+ * the opportunity to change how the normalization of MIME types is
+ * accomplished. One possible use would be to add default
+ * parameter/value pairs in cases where none are present in the MIME
+ * type string passed in.
+ *
+ * This method is never invoked by this implementation from 1.1 onwards.
+ *
+ * @param mimeType the mime type
+ * @return the mime type
+ * @deprecated
+ */
+ @Deprecated
+ protected String normalizeMimeType(String mimeType) {
+ return mimeType;
+ }
+
+ /*
+ * fields
+ */
+
+ /* placeholder for caching any platform-specific data for flavor */
+
+ transient int atom;
+
+ /* Mime Type of DataFlavor */
+
+ MimeType mimeType;
+
+ private String humanPresentableName;
+
+ /** Java class of objects this DataFlavor represents **/
+
+ private Class<?> representationClass;
+
+} // class DataFlavor