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/*
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* Copyright (c) 1999, 2006, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package sun.awt.datatransfer;
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import java.awt.EventQueue;
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import java.awt.datatransfer.Clipboard;
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import java.awt.datatransfer.FlavorTable;
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import java.awt.datatransfer.SystemFlavorMap;
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import java.awt.datatransfer.Transferable;
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import java.awt.datatransfer.ClipboardOwner;
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import java.awt.datatransfer.DataFlavor;
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import java.awt.datatransfer.FlavorListener;
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import java.awt.datatransfer.FlavorEvent;
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import java.awt.datatransfer.UnsupportedFlavorException;
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import java.beans.PropertyChangeEvent;
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import java.beans.PropertyChangeListener;
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import java.util.Iterator;
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import java.util.Set;
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import java.util.HashSet;
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import java.io.IOException;
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import sun.awt.AppContext;
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import sun.awt.PeerEvent;
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import sun.awt.SunToolkit;
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import sun.awt.EventListenerAggregate;
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/**
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* Serves as a common, helper superclass for the Win32 and X11 system
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* Clipboards.
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*
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* @author Danila Sinopalnikov
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* @author Alexander Gerasimov
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*
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* @since 1.3
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*/
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public abstract class SunClipboard extends Clipboard
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implements PropertyChangeListener {
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public static final FlavorTable flavorMap =
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(FlavorTable)SystemFlavorMap.getDefaultFlavorMap();
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private AppContext contentsContext = null;
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private final Object CLIPBOARD_FLAVOR_LISTENER_KEY;
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/**
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* A number of <code>FlavorListener</code>s currently registered
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* on this clipboard across all <code>AppContext</code>s.
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*/
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private volatile int numberOfFlavorListeners = 0;
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/**
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* A set of <code>DataFlavor</code>s that is available on
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* this clipboard. It is used for tracking changes
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* of <code>DataFlavor</code>s available on this clipboard.
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*/
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private volatile Set currentDataFlavors;
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public SunClipboard(String name) {
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super(name);
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CLIPBOARD_FLAVOR_LISTENER_KEY = new StringBuffer(name + "_CLIPBOARD_FLAVOR_LISTENER_KEY");
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}
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public synchronized void setContents(Transferable contents,
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ClipboardOwner owner) {
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// 4378007 : Toolkit.getSystemClipboard().setContents(null, null)
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// should throw NPE
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if (contents == null) {
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throw new NullPointerException("contents");
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}
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initContext();
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final ClipboardOwner oldOwner = this.owner;
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final Transferable oldContents = this.contents;
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try {
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this.owner = owner;
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this.contents = new TransferableProxy(contents, true);
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setContentsNative(contents);
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} finally {
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if (oldOwner != null && oldOwner != owner) {
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EventQueue.invokeLater(new Runnable() {
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public void run() {
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oldOwner.lostOwnership(SunClipboard.this, oldContents);
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}
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});
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}
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}
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}
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private synchronized void initContext() {
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final AppContext context = AppContext.getAppContext();
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if (contentsContext != context) {
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// Need to synchronize on the AppContext to guarantee that it cannot
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// be disposed after the check, but before the listener is added.
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synchronized (context) {
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if (context.isDisposed()) {
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throw new IllegalStateException("Can't set contents from disposed AppContext");
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}
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context.addPropertyChangeListener
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(AppContext.DISPOSED_PROPERTY_NAME, this);
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}
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if (contentsContext != null) {
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contentsContext.removePropertyChangeListener
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(AppContext.DISPOSED_PROPERTY_NAME, this);
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}
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contentsContext = context;
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}
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}
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public synchronized Transferable getContents(Object requestor) {
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if (contents != null) {
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return contents;
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}
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return new ClipboardTransferable(this);
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}
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/**
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* @return the contents of this clipboard if it has been set from the same
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* AppContext as it is currently retrieved or null otherwise
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* @since 1.5
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*/
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private synchronized Transferable getContextContents() {
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AppContext context = AppContext.getAppContext();
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return (context == contentsContext) ? contents : null;
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}
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/**
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* @see java.awt.Clipboard#getAvailableDataFlavors
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* @since 1.5
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*/
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public DataFlavor[] getAvailableDataFlavors() {
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Transferable cntnts = getContextContents();
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if (cntnts != null) {
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return cntnts.getTransferDataFlavors();
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}
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long[] formats = getClipboardFormatsOpenClose();
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return DataTransferer.getInstance().
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getFlavorsForFormatsAsArray(formats, flavorMap);
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}
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/**
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* @see java.awt.Clipboard#isDataFlavorAvailable
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* @since 1.5
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*/
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public boolean isDataFlavorAvailable(DataFlavor flavor) {
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if (flavor == null) {
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throw new NullPointerException("flavor");
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}
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Transferable cntnts = getContextContents();
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if (cntnts != null) {
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return cntnts.isDataFlavorSupported(flavor);
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}
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long[] formats = getClipboardFormatsOpenClose();
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return formatArrayAsDataFlavorSet(formats).contains(flavor);
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}
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/**
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* @see java.awt.Clipboard#getData
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* @since 1.5
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*/
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public Object getData(DataFlavor flavor)
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throws UnsupportedFlavorException, IOException {
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if (flavor == null) {
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throw new NullPointerException("flavor");
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}
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Transferable cntnts = getContextContents();
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if (cntnts != null) {
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return cntnts.getTransferData(flavor);
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}
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long format = 0;
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byte[] data = null;
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Transferable localeTransferable = null;
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try {
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openClipboard(null);
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long[] formats = getClipboardFormats();
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Long lFormat = (Long)DataTransferer.getInstance().
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getFlavorsForFormats(formats, flavorMap).get(flavor);
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if (lFormat == null) {
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throw new UnsupportedFlavorException(flavor);
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}
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format = lFormat.longValue();
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data = getClipboardData(format);
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if (DataTransferer.getInstance().isLocaleDependentTextFormat(format)) {
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localeTransferable = createLocaleTransferable(formats);
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}
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} finally {
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closeClipboard();
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}
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return DataTransferer.getInstance().
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translateBytes(data, flavor, format, localeTransferable);
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}
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/**
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* The clipboard must be opened.
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*
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* @since 1.5
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*/
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protected Transferable createLocaleTransferable(long[] formats) throws IOException {
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return null;
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}
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/**
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* @throws IllegalStateException if the clipboard has not been opened
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*/
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public void openClipboard(SunClipboard newOwner) {}
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public void closeClipboard() {}
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public abstract long getID();
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public void propertyChange(PropertyChangeEvent evt) {
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if (AppContext.DISPOSED_PROPERTY_NAME.equals(evt.getPropertyName()) &&
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Boolean.TRUE.equals(evt.getNewValue())) {
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final AppContext disposedContext = (AppContext)evt.getSource();
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lostOwnershipLater(disposedContext);
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}
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}
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protected void lostOwnershipImpl() {
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lostOwnershipLater(null);
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}
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/**
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* Clears the clipboard state (contents, owner and contents context) and
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* notifies the current owner that ownership is lost. Does nothing if the
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* argument is not <code>null</code> and is not equal to the current
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* contents context.
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*
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* @param disposedContext the AppContext that is disposed or
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* <code>null</code> if the ownership is lost because another
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* application acquired ownership.
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*/
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protected void lostOwnershipLater(final AppContext disposedContext) {
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final AppContext context = this.contentsContext;
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if (context == null) {
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return;
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}
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final Runnable runnable = new Runnable() {
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public void run() {
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final SunClipboard sunClipboard = SunClipboard.this;
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ClipboardOwner owner = null;
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Transferable contents = null;
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synchronized (sunClipboard) {
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final AppContext context = sunClipboard.contentsContext;
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if (context == null) {
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return;
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}
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if (disposedContext == null || context == disposedContext) {
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owner = sunClipboard.owner;
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contents = sunClipboard.contents;
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sunClipboard.contentsContext = null;
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sunClipboard.owner = null;
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sunClipboard.contents = null;
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sunClipboard.clearNativeContext();
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context.removePropertyChangeListener
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(AppContext.DISPOSED_PROPERTY_NAME, sunClipboard);
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} else {
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return;
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}
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}
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if (owner != null) {
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owner.lostOwnership(sunClipboard, contents);
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}
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}
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};
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SunToolkit.postEvent(context, new PeerEvent(this, runnable,
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PeerEvent.PRIORITY_EVENT));
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}
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protected abstract void clearNativeContext();
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protected abstract void setContentsNative(Transferable contents);
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/**
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* @since 1.5
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*/
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protected long[] getClipboardFormatsOpenClose() {
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try {
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openClipboard(null);
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return getClipboardFormats();
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} finally {
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closeClipboard();
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}
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}
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/**
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* Returns zero-length array (not null) if the number of available formats is zero.
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*
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* @throws IllegalStateException if formats could not be retrieved
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*/
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protected abstract long[] getClipboardFormats();
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protected abstract byte[] getClipboardData(long format) throws IOException;
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private static Set formatArrayAsDataFlavorSet(long[] formats) {
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return (formats == null) ? null :
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DataTransferer.getInstance().
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getFlavorsForFormatsAsSet(formats, flavorMap);
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}
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public synchronized void addFlavorListener(FlavorListener listener) {
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if (listener == null) {
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return;
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}
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AppContext appContext = AppContext.getAppContext();
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EventListenerAggregate contextFlavorListeners = (EventListenerAggregate)
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appContext.get(CLIPBOARD_FLAVOR_LISTENER_KEY);
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if (contextFlavorListeners == null) {
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contextFlavorListeners = new EventListenerAggregate(FlavorListener.class);
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appContext.put(CLIPBOARD_FLAVOR_LISTENER_KEY, contextFlavorListeners);
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}
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contextFlavorListeners.add(listener);
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if (numberOfFlavorListeners++ == 0) {
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long[] currentFormats = null;
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try {
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openClipboard(null);
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currentFormats = getClipboardFormats();
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} catch (IllegalStateException exc) {
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} finally {
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closeClipboard();
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}
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currentDataFlavors = formatArrayAsDataFlavorSet(currentFormats);
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registerClipboardViewerChecked();
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}
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}
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public synchronized void removeFlavorListener(FlavorListener listener) {
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if (listener == null) {
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return;
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}
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AppContext appContext = AppContext.getAppContext();
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EventListenerAggregate contextFlavorListeners = (EventListenerAggregate)
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|
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appContext.get(CLIPBOARD_FLAVOR_LISTENER_KEY);
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391 |
if (contextFlavorListeners == null){
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|
392 |
//else we throw NullPointerException, but it is forbidden
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return;
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|
394 |
}
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|
395 |
if (contextFlavorListeners.remove(listener) &&
|
|
396 |
--numberOfFlavorListeners == 0) {
|
|
397 |
unregisterClipboardViewerChecked();
|
|
398 |
currentDataFlavors = null;
|
|
399 |
}
|
|
400 |
}
|
|
401 |
|
|
402 |
public synchronized FlavorListener[] getFlavorListeners() {
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|
403 |
EventListenerAggregate contextFlavorListeners = (EventListenerAggregate)
|
|
404 |
AppContext.getAppContext().get(CLIPBOARD_FLAVOR_LISTENER_KEY);
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|
405 |
return contextFlavorListeners == null ? new FlavorListener[0] :
|
|
406 |
(FlavorListener[])contextFlavorListeners.getListenersCopy();
|
|
407 |
}
|
|
408 |
|
|
409 |
public boolean areFlavorListenersRegistered() {
|
|
410 |
return (numberOfFlavorListeners > 0);
|
|
411 |
}
|
|
412 |
|
|
413 |
protected abstract void registerClipboardViewerChecked();
|
|
414 |
|
|
415 |
protected abstract void unregisterClipboardViewerChecked();
|
|
416 |
|
|
417 |
/**
|
|
418 |
* Checks change of the <code>DataFlavor</code>s and, if necessary,
|
|
419 |
* posts notifications on <code>FlavorEvent</code>s to the
|
|
420 |
* AppContexts' EDTs.
|
|
421 |
* The parameter <code>formats</code> is null iff we have just
|
|
422 |
* failed to get formats available on the clipboard.
|
|
423 |
*
|
|
424 |
* @param formats data formats that have just been retrieved from
|
|
425 |
* this clipboard
|
|
426 |
*/
|
|
427 |
public void checkChange(long[] formats) {
|
|
428 |
Set prevDataFlavors = currentDataFlavors;
|
|
429 |
currentDataFlavors = formatArrayAsDataFlavorSet(formats);
|
|
430 |
|
|
431 |
if ((prevDataFlavors != null) && (currentDataFlavors != null) &&
|
|
432 |
prevDataFlavors.equals(currentDataFlavors)) {
|
|
433 |
// we've been able to successfully get available on the clipboard
|
|
434 |
// DataFlavors this and previous time and they are coincident;
|
|
435 |
// don't notify
|
|
436 |
return;
|
|
437 |
}
|
|
438 |
|
|
439 |
class SunFlavorChangeNotifier implements Runnable {
|
|
440 |
private final FlavorListener flavorListener;
|
|
441 |
|
|
442 |
SunFlavorChangeNotifier(FlavorListener flavorListener) {
|
|
443 |
this.flavorListener = flavorListener;
|
|
444 |
}
|
|
445 |
|
|
446 |
public void run() {
|
|
447 |
if (flavorListener != null) {
|
|
448 |
flavorListener.flavorsChanged(new FlavorEvent(SunClipboard.this));
|
|
449 |
}
|
|
450 |
}
|
|
451 |
};
|
|
452 |
|
|
453 |
for (Iterator it = AppContext.getAppContexts().iterator(); it.hasNext();) {
|
|
454 |
AppContext appContext = (AppContext)it.next();
|
|
455 |
if (appContext == null || appContext.isDisposed()) {
|
|
456 |
continue;
|
|
457 |
}
|
|
458 |
EventListenerAggregate flavorListeners = (EventListenerAggregate)
|
|
459 |
appContext.get(CLIPBOARD_FLAVOR_LISTENER_KEY);
|
|
460 |
if (flavorListeners != null) {
|
|
461 |
FlavorListener[] flavorListenerArray =
|
|
462 |
(FlavorListener[])flavorListeners.getListenersInternal();
|
|
463 |
for (int i = 0; i < flavorListenerArray.length; i++) {
|
|
464 |
SunToolkit.postEvent(appContext, new PeerEvent(this,
|
|
465 |
new SunFlavorChangeNotifier(flavorListenerArray[i]),
|
|
466 |
PeerEvent.PRIORITY_EVENT));
|
|
467 |
}
|
|
468 |
}
|
|
469 |
}
|
|
470 |
}
|
|
471 |
|
|
472 |
}
|