--- a/jdk/src/java.desktop/share/classes/sun/datatransfer/DataFlavorUtil.java Thu Feb 19 16:36:35 2015 -0800
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,841 +0,0 @@
-/*
- * Copyright (c) 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 sun.datatransfer;
-
-import java.awt.datatransfer.DataFlavor;
-import java.awt.datatransfer.FlavorMap;
-import java.io.IOException;
-import java.io.InputStream;
-import java.io.Reader;
-import java.lang.reflect.Constructor;
-import java.lang.reflect.InvocationTargetException;
-import java.lang.reflect.Method;
-import java.nio.ByteBuffer;
-import java.nio.CharBuffer;
-import java.nio.charset.Charset;
-import java.nio.charset.IllegalCharsetNameException;
-import java.nio.charset.StandardCharsets;
-import java.nio.charset.UnsupportedCharsetException;
-import java.util.Collections;
-import java.util.Comparator;
-import java.util.HashMap;
-import java.util.Iterator;
-import java.util.LinkedHashSet;
-import java.util.Map;
-import java.util.ServiceLoader;
-import java.util.Set;
-import java.util.SortedSet;
-import java.util.TreeSet;
-import java.util.function.Supplier;
-
-
-/**
- * Utility class with different datatransfer helper functions
- *
- * @see 1.9
- */
-public class DataFlavorUtil {
-
- private DataFlavorUtil() {
- // Avoid instantiation
- }
-
- private static Comparator<String> getCharsetComparator() {
- return CharsetComparator.INSTANCE;
- }
-
- public static Comparator<DataFlavor> getDataFlavorComparator() {
- return DataFlavorComparator.INSTANCE;
- }
-
- public static Comparator<Long> getIndexOrderComparator(Map<Long, Integer> indexMap) {
- return new IndexOrderComparator(indexMap);
- }
-
- public static Comparator<DataFlavor> getTextFlavorComparator() {
- return TextFlavorComparator.INSTANCE;
- }
-
- /**
- * Tracks whether a particular text/* MIME type supports the charset
- * parameter. The Map is initialized with all of the standard MIME types
- * listed in the DataFlavor.selectBestTextFlavor method comment. Additional
- * entries may be added during the life of the JRE for text/<other> types.
- */
- private static final Map<String, Boolean> textMIMESubtypeCharsetSupport;
-
- static {
- Map<String, Boolean> tempMap = new HashMap<>(17);
- tempMap.put("sgml", Boolean.TRUE);
- tempMap.put("xml", Boolean.TRUE);
- tempMap.put("html", Boolean.TRUE);
- tempMap.put("enriched", Boolean.TRUE);
- tempMap.put("richtext", Boolean.TRUE);
- tempMap.put("uri-list", Boolean.TRUE);
- tempMap.put("directory", Boolean.TRUE);
- tempMap.put("css", Boolean.TRUE);
- tempMap.put("calendar", Boolean.TRUE);
- tempMap.put("plain", Boolean.TRUE);
- tempMap.put("rtf", Boolean.FALSE);
- tempMap.put("tab-separated-values", Boolean.FALSE);
- tempMap.put("t140", Boolean.FALSE);
- tempMap.put("rfc822-headers", Boolean.FALSE);
- tempMap.put("parityfec", Boolean.FALSE);
- textMIMESubtypeCharsetSupport = Collections.synchronizedMap(tempMap);
- }
-
- /**
- * Lazy initialization of Standard Encodings.
- */
- private static class StandardEncodingsHolder {
- private static final SortedSet<String> standardEncodings = load();
-
- private static SortedSet<String> load() {
- final SortedSet<String> tempSet = new TreeSet<>(getCharsetComparator().reversed());
- tempSet.add("US-ASCII");
- tempSet.add("ISO-8859-1");
- tempSet.add("UTF-8");
- tempSet.add("UTF-16BE");
- tempSet.add("UTF-16LE");
- tempSet.add("UTF-16");
- tempSet.add(Charset.defaultCharset().name());
- return Collections.unmodifiableSortedSet(tempSet);
- }
- }
-
- /**
- * Returns a {@code SortedSet} of Strings which are a total order of the standard
- * character sets supported by the JRE. The ordering follows the same principles as
- * {@link java.awt.datatransfer.DataFlavor#selectBestTextFlavor(java.awt.datatransfer.DataFlavor[])}.
- * So as to avoid loading all available character converters, optional, non-standard,
- * character sets are not included.
- */
- public static Set<String> standardEncodings() {
- return StandardEncodingsHolder.standardEncodings;
- }
-
- /**
- * Converts an arbitrary text encoding to its canonical name.
- */
- public static String canonicalName(String encoding) {
- if (encoding == null) {
- return null;
- }
- try {
- return Charset.forName(encoding).name();
- } catch (IllegalCharsetNameException icne) {
- return encoding;
- } catch (UnsupportedCharsetException uce) {
- return encoding;
- }
- }
-
- /**
- * Tests only whether the flavor's MIME type supports the charset
- * parameter. Must only be called for flavors with a primary type of
- * "text".
- */
- public static boolean doesSubtypeSupportCharset(DataFlavor flavor) {
- String subType = flavor.getSubType();
- if (subType == null) {
- return false;
- }
-
- Boolean support = textMIMESubtypeCharsetSupport.get(subType);
-
- if (support != null) {
- return support;
- }
-
- boolean ret_val = (flavor.getParameter("charset") != null);
- textMIMESubtypeCharsetSupport.put(subType, ret_val);
- return ret_val;
- }
- public static boolean doesSubtypeSupportCharset(String subType,
- String charset)
- {
- Boolean support = textMIMESubtypeCharsetSupport.get(subType);
-
- if (support != null) {
- return support;
- }
-
- boolean ret_val = (charset != null);
- textMIMESubtypeCharsetSupport.put(subType, ret_val);
- return ret_val;
- }
-
-
- /**
- * Returns whether this flavor is a text type which supports the
- * 'charset' parameter.
- */
- public static boolean isFlavorCharsetTextType(DataFlavor flavor) {
- // Although stringFlavor doesn't actually support the charset
- // parameter (because its primary MIME type is not "text"), it should
- // be treated as though it does. stringFlavor is semantically
- // equivalent to "text/plain" data.
- if (DataFlavor.stringFlavor.equals(flavor)) {
- return true;
- }
-
- if (!"text".equals(flavor.getPrimaryType()) ||
- !doesSubtypeSupportCharset(flavor))
- {
- return false;
- }
-
- Class<?> rep_class = flavor.getRepresentationClass();
-
- if (flavor.isRepresentationClassReader() ||
- String.class.equals(rep_class) ||
- flavor.isRepresentationClassCharBuffer() ||
- char[].class.equals(rep_class))
- {
- return true;
- }
-
- if (!(flavor.isRepresentationClassInputStream() ||
- flavor.isRepresentationClassByteBuffer() ||
- byte[].class.equals(rep_class))) {
- return false;
- }
-
- String charset = flavor.getParameter("charset");
-
- // null equals default encoding which is always supported
- return (charset == null) || isEncodingSupported(charset);
- }
-
- /**
- * Returns whether this flavor is a text type which does not support the
- * 'charset' parameter.
- */
- public static boolean isFlavorNoncharsetTextType(DataFlavor flavor) {
- if (!"text".equals(flavor.getPrimaryType()) || doesSubtypeSupportCharset(flavor)) {
- return false;
- }
-
- return (flavor.isRepresentationClassInputStream() ||
- flavor.isRepresentationClassByteBuffer() ||
- byte[].class.equals(flavor.getRepresentationClass()));
- }
-
- /**
- * If the specified flavor is a text flavor which supports the "charset"
- * parameter, then this method returns that parameter, or the default
- * charset if no such parameter was specified at construction. For non-
- * text DataFlavors, and for non-charset text flavors, this method returns
- * null.
- */
- public static String getTextCharset(DataFlavor flavor) {
- if (!isFlavorCharsetTextType(flavor)) {
- return null;
- }
-
- String encoding = flavor.getParameter("charset");
-
- return (encoding != null) ? encoding : Charset.defaultCharset().name();
- }
-
- /**
- * Determines whether this JRE can both encode and decode text in the
- * specified encoding.
- */
- private static boolean isEncodingSupported(String encoding) {
- if (encoding == null) {
- return false;
- }
- try {
- return Charset.isSupported(encoding);
- } catch (IllegalCharsetNameException icne) {
- return false;
- }
- }
-
- /**
- * Helper method to compare two objects by their Integer indices in the
- * given map. If the map doesn't contain an entry for either of the
- * objects, the fallback index will be used for the object instead.
- *
- * @param indexMap the map which maps objects into Integer indexes.
- * @param obj1 the first object to be compared.
- * @param obj2 the second object to be compared.
- * @param fallbackIndex the Integer to be used as a fallback index.
- * @return a negative integer, zero, or a positive integer as the
- * first object is mapped to a less, equal to, or greater
- * index than the second.
- */
- static <T> int compareIndices(Map<T, Integer> indexMap,
- T obj1, T obj2,
- Integer fallbackIndex) {
- Integer index1 = indexMap.getOrDefault(obj1, fallbackIndex);
- Integer index2 = indexMap.getOrDefault(obj2, fallbackIndex);
- return index1.compareTo(index2);
- }
-
- /**
- * An IndexedComparator which compares two String charsets. The comparison
- * follows the rules outlined in DataFlavor.selectBestTextFlavor. In order
- * to ensure that non-Unicode, non-ASCII, non-default charsets are sorted
- * in alphabetical order, charsets are not automatically converted to their
- * canonical forms.
- */
- private static class CharsetComparator implements Comparator<String> {
- static final CharsetComparator INSTANCE = new CharsetComparator();
-
- private static final Map<String, Integer> charsets;
-
- private static final Integer DEFAULT_CHARSET_INDEX = 2;
- private static final Integer OTHER_CHARSET_INDEX = 1;
- private static final Integer WORST_CHARSET_INDEX = 0;
- private static final Integer UNSUPPORTED_CHARSET_INDEX = Integer.MIN_VALUE;
-
- private static final String UNSUPPORTED_CHARSET = "UNSUPPORTED";
-
- static {
- Map<String, Integer> charsetsMap = new HashMap<>(8, 1.0f);
-
- // we prefer Unicode charsets
- charsetsMap.put(canonicalName("UTF-16LE"), 4);
- charsetsMap.put(canonicalName("UTF-16BE"), 5);
- charsetsMap.put(canonicalName("UTF-8"), 6);
- charsetsMap.put(canonicalName("UTF-16"), 7);
-
- // US-ASCII is the worst charset supported
- charsetsMap.put(canonicalName("US-ASCII"), WORST_CHARSET_INDEX);
-
- charsetsMap.putIfAbsent(Charset.defaultCharset().name(), DEFAULT_CHARSET_INDEX);
-
- charsetsMap.put(UNSUPPORTED_CHARSET, UNSUPPORTED_CHARSET_INDEX);
-
- charsets = Collections.unmodifiableMap(charsetsMap);
- }
-
- /**
- * Compares charsets. Returns a negative integer, zero, or a positive
- * integer as the first charset is worse than, equal to, or better than
- * the second.
- * <p>
- * Charsets are ordered according to the following rules:
- * <ul>
- * <li>All unsupported charsets are equal.
- * <li>Any unsupported charset is worse than any supported charset.
- * <li>Unicode charsets, such as "UTF-16", "UTF-8", "UTF-16BE" and
- * "UTF-16LE", are considered best.
- * <li>After them, platform default charset is selected.
- * <li>"US-ASCII" is the worst of supported charsets.
- * <li>For all other supported charsets, the lexicographically less
- * one is considered the better.
- * </ul>
- *
- * @param charset1 the first charset to be compared
- * @param charset2 the second charset 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.
- */
- public int compare(String charset1, String charset2) {
- charset1 = getEncoding(charset1);
- charset2 = getEncoding(charset2);
-
- int comp = compareIndices(charsets, charset1, charset2, OTHER_CHARSET_INDEX);
-
- if (comp == 0) {
- return charset2.compareTo(charset1);
- }
-
- return comp;
- }
-
- /**
- * Returns encoding for the specified charset according to the
- * following rules:
- * <ul>
- * <li>If the charset is <code>null</code>, then <code>null</code> will
- * be returned.
- * <li>Iff the charset specifies an encoding unsupported by this JRE,
- * <code>UNSUPPORTED_CHARSET</code> will be returned.
- * <li>If the charset specifies an alias name, the corresponding
- * canonical name will be returned iff the charset is a known
- * Unicode, ASCII, or default charset.
- * </ul>
- *
- * @param charset the charset.
- * @return an encoding for this charset.
- */
- static String getEncoding(String charset) {
- if (charset == null) {
- return null;
- } else if (!isEncodingSupported(charset)) {
- return UNSUPPORTED_CHARSET;
- } else {
- // Only convert to canonical form if the charset is one
- // of the charsets explicitly listed in the known charsets
- // map. This will happen only for Unicode, ASCII, or default
- // charsets.
- String canonicalName = canonicalName(charset);
- return (charsets.containsKey(canonicalName))
- ? canonicalName
- : charset;
- }
- }
- }
-
- /**
- * An IndexedComparator which compares two DataFlavors. For text flavors,
- * the comparison follows the rules outlined in
- * DataFlavor.selectBestTextFlavor. For non-text flavors, unknown
- * application MIME types are preferred, followed by known
- * application/x-java-* MIME types. Unknown application types are preferred
- * because if the user provides his own data flavor, it will likely be the
- * most descriptive one. For flavors which are otherwise equal, the
- * flavors' string representation are compared in the alphabetical order.
- */
- private static class DataFlavorComparator implements Comparator<DataFlavor> {
-
- static final DataFlavorComparator INSTANCE = new DataFlavorComparator();
-
- private static final Map<String, Integer> exactTypes;
- private static final Map<String, Integer> primaryTypes;
- private static final Map<Class<?>, Integer> nonTextRepresentations;
- private static final Map<String, Integer> textTypes;
- private static final Map<Class<?>, Integer> decodedTextRepresentations;
- private static final Map<Class<?>, Integer> encodedTextRepresentations;
-
- private static final Integer UNKNOWN_OBJECT_LOSES = Integer.MIN_VALUE;
- private static final Integer UNKNOWN_OBJECT_WINS = Integer.MAX_VALUE;
-
- static {
- {
- Map<String, Integer> exactTypesMap = new HashMap<>(4, 1.0f);
-
- // application/x-java-* MIME types
- exactTypesMap.put("application/x-java-file-list", 0);
- exactTypesMap.put("application/x-java-serialized-object", 1);
- exactTypesMap.put("application/x-java-jvm-local-objectref", 2);
- exactTypesMap.put("application/x-java-remote-object", 3);
-
- exactTypes = Collections.unmodifiableMap(exactTypesMap);
- }
-
- {
- Map<String, Integer> primaryTypesMap = new HashMap<>(1, 1.0f);
-
- primaryTypesMap.put("application", 0);
-
- primaryTypes = Collections.unmodifiableMap(primaryTypesMap);
- }
-
- {
- Map<Class<?>, Integer> nonTextRepresentationsMap = new HashMap<>(3, 1.0f);
-
- nonTextRepresentationsMap.put(java.io.InputStream.class, 0);
- nonTextRepresentationsMap.put(java.io.Serializable.class, 1);
-
- nonTextRepresentationsMap.put(RMI.remoteClass(), 2);
-
- nonTextRepresentations = Collections.unmodifiableMap(nonTextRepresentationsMap);
- }
-
- {
- Map<String, Integer> textTypesMap = new HashMap<>(16, 1.0f);
-
- // plain text
- textTypesMap.put("text/plain", 0);
-
- // stringFlavor
- textTypesMap.put("application/x-java-serialized-object", 1);
-
- // misc
- textTypesMap.put("text/calendar", 2);
- textTypesMap.put("text/css", 3);
- textTypesMap.put("text/directory", 4);
- textTypesMap.put("text/parityfec", 5);
- textTypesMap.put("text/rfc822-headers", 6);
- textTypesMap.put("text/t140", 7);
- textTypesMap.put("text/tab-separated-values", 8);
- textTypesMap.put("text/uri-list", 9);
-
- // enriched
- textTypesMap.put("text/richtext", 10);
- textTypesMap.put("text/enriched", 11);
- textTypesMap.put("text/rtf", 12);
-
- // markup
- textTypesMap.put("text/html", 13);
- textTypesMap.put("text/xml", 14);
- textTypesMap.put("text/sgml", 15);
-
- textTypes = Collections.unmodifiableMap(textTypesMap);
- }
-
- {
- Map<Class<?>, Integer> decodedTextRepresentationsMap = new HashMap<>(4, 1.0f);
-
- decodedTextRepresentationsMap.put(char[].class, 0);
- decodedTextRepresentationsMap.put(CharBuffer.class, 1);
- decodedTextRepresentationsMap.put(String.class, 2);
- decodedTextRepresentationsMap.put(Reader.class, 3);
-
- decodedTextRepresentations =
- Collections.unmodifiableMap(decodedTextRepresentationsMap);
- }
-
- {
- Map<Class<?>, Integer> encodedTextRepresentationsMap = new HashMap<>(3, 1.0f);
-
- encodedTextRepresentationsMap.put(byte[].class, 0);
- encodedTextRepresentationsMap.put(ByteBuffer.class, 1);
- encodedTextRepresentationsMap.put(InputStream.class, 2);
-
- encodedTextRepresentations =
- Collections.unmodifiableMap(encodedTextRepresentationsMap);
- }
- }
-
-
- public int compare(DataFlavor flavor1, DataFlavor flavor2) {
- if (flavor1.equals(flavor2)) {
- return 0;
- }
-
- int comp;
-
- String primaryType1 = flavor1.getPrimaryType();
- String subType1 = flavor1.getSubType();
- String mimeType1 = primaryType1 + "/" + subType1;
- Class<?> class1 = flavor1.getRepresentationClass();
-
- String primaryType2 = flavor2.getPrimaryType();
- String subType2 = flavor2.getSubType();
- String mimeType2 = primaryType2 + "/" + subType2;
- Class<?> class2 = flavor2.getRepresentationClass();
-
- if (flavor1.isFlavorTextType() && flavor2.isFlavorTextType()) {
- // First, compare MIME types
- comp = compareIndices(textTypes, mimeType1, mimeType2, UNKNOWN_OBJECT_LOSES);
- if (comp != 0) {
- return comp;
- }
-
- // Only need to test one flavor because they both have the
- // same MIME type. Also don't need to worry about accidentally
- // passing stringFlavor because either
- // 1. Both flavors are stringFlavor, in which case the
- // equality test at the top of the function succeeded.
- // 2. Only one flavor is stringFlavor, in which case the MIME
- // type comparison returned a non-zero value.
- if (doesSubtypeSupportCharset(flavor1)) {
- // Next, prefer the decoded text representations of Reader,
- // String, CharBuffer, and [C, in that order.
- comp = compareIndices(decodedTextRepresentations, class1,
- class2, UNKNOWN_OBJECT_LOSES);
- if (comp != 0) {
- return comp;
- }
-
- // Next, compare charsets
- comp = CharsetComparator.INSTANCE.compare(getTextCharset(flavor1),
- getTextCharset(flavor2));
- if (comp != 0) {
- return comp;
- }
- }
-
- // Finally, prefer the encoded text representations of
- // InputStream, ByteBuffer, and [B, in that order.
- comp = compareIndices(encodedTextRepresentations, class1,
- class2, UNKNOWN_OBJECT_LOSES);
- if (comp != 0) {
- return comp;
- }
- } else {
- // First, prefer application types.
- comp = compareIndices(primaryTypes, primaryType1, primaryType2,
- UNKNOWN_OBJECT_LOSES);
- if (comp != 0) {
- return comp;
- }
-
- // Next prefer text types
- if (flavor1.isFlavorTextType()) {
- return 1;
- }
-
- if (flavor2.isFlavorTextType()) {
- return -1;
- }
-
- // Next, look for application/x-java-* types. Prefer unknown
- // MIME types because if the user provides his own data flavor,
- // it will likely be the most descriptive one.
- comp = compareIndices(exactTypes, mimeType1, mimeType2,
- UNKNOWN_OBJECT_WINS);
- if (comp != 0) {
- return comp;
- }
-
- // Finally, prefer the representation classes of Remote,
- // Serializable, and InputStream, in that order.
- comp = compareIndices(nonTextRepresentations, class1, class2,
- UNKNOWN_OBJECT_LOSES);
- if (comp != 0) {
- return comp;
- }
- }
-
- // The flavours are not equal but still not distinguishable.
- // Compare String representations in alphabetical order
- return flavor1.getMimeType().compareTo(flavor2.getMimeType());
- }
- }
-
- /*
- * Given the Map that maps objects to Integer indices and a boolean value,
- * this Comparator imposes a direct or reverse order on set of objects.
- * <p>
- * If the specified boolean value is SELECT_BEST, the Comparator imposes the
- * direct index-based order: an object A is greater than an object B if and
- * only if the index of A is greater than the index of B. An object that
- * doesn't have an associated index is less or equal than any other object.
- * <p>
- * If the specified boolean value is SELECT_WORST, the Comparator imposes the
- * reverse index-based order: an object A is greater than an object B if and
- * only if A is less than B with the direct index-based order.
- */
- private static class IndexOrderComparator implements Comparator<Long> {
- private final Map<Long, Integer> indexMap;
- private static final Integer FALLBACK_INDEX = Integer.MIN_VALUE;
-
- public IndexOrderComparator(Map<Long, Integer> indexMap) {
- this.indexMap = indexMap;
- }
-
- public int compare(Long obj1, Long obj2) {
- return compareIndices(indexMap, obj1, obj2, FALLBACK_INDEX);
- }
- }
-
- private static class TextFlavorComparator extends DataFlavorComparator {
-
- static final TextFlavorComparator INSTANCE = new TextFlavorComparator();
- /**
- * 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 java.awt.datatransfer.DataFlavor#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;
- }
- }
- }
-
- /**
- * A fallback implementation of {@link sun.datatransfer.DesktopDatatransferService}
- * used if there is no desktop.
- */
- private static final class DefaultDesktopDatatransferService implements DesktopDatatransferService {
- static final DesktopDatatransferService INSTANCE = getDesktopService();
-
- private static DesktopDatatransferService getDesktopService() {
- ServiceLoader<DesktopDatatransferService> loader =
- ServiceLoader.load(DesktopDatatransferService.class, null);
- Iterator<DesktopDatatransferService> iterator = loader.iterator();
- if (iterator.hasNext()) {
- return iterator.next();
- } else {
- return new DefaultDesktopDatatransferService();
- }
- }
-
- /**
- * System singleton FlavorTable.
- * Only used if there is no desktop
- * to provide an appropriate FlavorMap.
- */
- private volatile FlavorMap flavorMap;
-
- @Override
- public void invokeOnEventThread(Runnable r) {
- r.run();
- }
-
- @Override
- public String getDefaultUnicodeEncoding() {
- return StandardCharsets.UTF_8.name();
- }
-
- @Override
- public FlavorMap getFlavorMap(Supplier<FlavorMap> supplier) {
- FlavorMap map = flavorMap;
- if (map == null) {
- synchronized (this) {
- map = flavorMap;
- if (map == null) {
- flavorMap = map = supplier.get();
- }
- }
- }
- return map;
- }
-
- @Override
- public boolean isDesktopPresent() {
- return false;
- }
-
- @Override
- public LinkedHashSet<DataFlavor> getPlatformMappingsForNative(String nat) {
- return new LinkedHashSet<>();
- }
-
- @Override
- public LinkedHashSet<String> getPlatformMappingsForFlavor(DataFlavor df) {
- return new LinkedHashSet<>();
- }
-
- @Override
- public void registerTextFlavorProperties(String nat, String charset,
- String eoln, String terminators) {
- // Not needed if desktop module is absent
- }
- }
-
- public static DesktopDatatransferService getDesktopService() {
- return DefaultDesktopDatatransferService.INSTANCE;
- }
-
- /**
- * A class that provides access to java.rmi.Remote and java.rmi.MarshalledObject
- * without creating a static dependency.
- */
- public static class RMI {
- private static final Class<?> remoteClass = getClass("java.rmi.Remote");
- private static final Class<?> marshallObjectClass = getClass("java.rmi.MarshalledObject");
- private static final Constructor<?> marshallCtor = getConstructor(marshallObjectClass, Object.class);
- private static final Method marshallGet = getMethod(marshallObjectClass, "get");
-
- private static Class<?> getClass(String name) {
- try {
- return Class.forName(name, true, null);
- } catch (ClassNotFoundException e) {
- return null;
- }
- }
-
- private static Constructor<?> getConstructor(Class<?> c, Class<?>... types) {
- try {
- return (c == null) ? null : c.getDeclaredConstructor(types);
- } catch (NoSuchMethodException x) {
- throw new AssertionError(x);
- }
- }
-
- private static Method getMethod(Class<?> c, String name, Class<?>... types) {
- try {
- return (c == null) ? null : c.getMethod(name, types);
- } catch (NoSuchMethodException e) {
- throw new AssertionError(e);
- }
- }
-
- /**
- * Returns java.rmi.Remote.class if RMI is present; otherwise {@code null}.
- */
- static Class<?> remoteClass() {
- return remoteClass;
- }
-
- /**
- * Returns {@code true} if the given class is java.rmi.Remote.
- */
- public static boolean isRemote(Class<?> c) {
- return (remoteClass != null) && remoteClass.isAssignableFrom(c);
- }
-
- /**
- * Returns a new MarshalledObject containing the serialized representation
- * of the given object.
- */
- public static Object newMarshalledObject(Object obj) throws IOException {
- try {
- return marshallCtor == null ? null : marshallCtor.newInstance(obj);
- } catch (InstantiationException | IllegalAccessException x) {
- throw new AssertionError(x);
- } catch (InvocationTargetException x) {
- Throwable cause = x.getCause();
- if (cause instanceof IOException)
- throw (IOException) cause;
- throw new AssertionError(x);
- }
- }
-
- /**
- * Returns a new copy of the contained marshalled object.
- */
- public static Object getMarshalledObject(Object obj)
- throws IOException, ClassNotFoundException {
- try {
- return marshallGet == null ? null : marshallGet.invoke(obj);
- } catch (IllegalAccessException x) {
- throw new AssertionError(x);
- } catch (InvocationTargetException x) {
- Throwable cause = x.getCause();
- if (cause instanceof IOException)
- throw (IOException) cause;
- if (cause instanceof ClassNotFoundException)
- throw (ClassNotFoundException) cause;
- throw new AssertionError(x);
- }
- }
-
- }
-}