/*
* Copyright (c) 1999, 2008, 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
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*/
package javax.swing;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.util.HashMap;
import java.util.Set;
/**
* <code>ActionMap</code> provides mappings from
* <code>Object</code>s
* (called <em>keys</em> or <em><code>Action</code> names</em>)
* to <code>Action</code>s.
* An <code>ActionMap</code> is usually used with an <code>InputMap</code>
* to locate a particular action
* when a key is pressed. As with <code>InputMap</code>,
* an <code>ActionMap</code> can have a parent
* that is searched for keys not defined in the <code>ActionMap</code>.
* <p>As with <code>InputMap</code> if you create a cycle, eg:
* <pre>
* ActionMap am = new ActionMap();
* ActionMap bm = new ActionMap():
* am.setParent(bm);
* bm.setParent(am);
* </pre>
* some of the methods will cause a StackOverflowError to be thrown.
*
* @see InputMap
*
* @author Scott Violet
* @since 1.3
*/
public class ActionMap implements Serializable {
/** Handles the mapping between Action name and Action. */
private transient ArrayTable arrayTable;
/** Parent that handles any bindings we don't contain. */
private ActionMap parent;
/**
* Creates an <code>ActionMap</code> with no parent and no mappings.
*/
public ActionMap() {
}
/**
* Sets this <code>ActionMap</code>'s parent.
*
* @param map the <code>ActionMap</code> that is the parent of this one
*/
public void setParent(ActionMap map) {
this.parent = map;
}
/**
* Returns this <code>ActionMap</code>'s parent.
*
* @return the <code>ActionMap</code> that is the parent of this one,
* or null if this <code>ActionMap</code> has no parent
*/
public ActionMap getParent() {
return parent;
}
/**
* Adds a binding for <code>key</code> to <code>action</code>.
* If <code>action</code> is null, this removes the current binding
* for <code>key</code>.
* <p>In most instances, <code>key</code> will be
* <code>action.getValue(NAME)</code>.
*/
public void put(Object key, Action action) {
if (key == null) {
return;
}
if (action == null) {
remove(key);
}
else {
if (arrayTable == null) {
arrayTable = new ArrayTable();
}
arrayTable.put(key, action);
}
}
/**
* Returns the binding for <code>key</code>, messaging the
* parent <code>ActionMap</code> if the binding is not locally defined.
*/
public Action get(Object key) {
Action value = (arrayTable == null) ? null :
(Action)arrayTable.get(key);
if (value == null) {
ActionMap parent = getParent();
if (parent != null) {
return parent.get(key);
}
}
return value;
}
/**
* Removes the binding for <code>key</code> from this <code>ActionMap</code>.
*/
public void remove(Object key) {
if (arrayTable != null) {
arrayTable.remove(key);
}
}
/**
* Removes all the mappings from this <code>ActionMap</code>.
*/
public void clear() {
if (arrayTable != null) {
arrayTable.clear();
}
}
/**
* Returns the <code>Action</code> names that are bound in this <code>ActionMap</code>.
*/
public Object[] keys() {
if (arrayTable == null) {
return null;
}
return arrayTable.getKeys(null);
}
/**
* Returns the number of bindings in this {@code ActionMap}.
*
* @return the number of bindings in this {@code ActionMap}
*/
public int size() {
if (arrayTable == null) {
return 0;
}
return arrayTable.size();
}
/**
* Returns an array of the keys defined in this <code>ActionMap</code> and
* its parent. This method differs from <code>keys()</code> in that
* this method includes the keys defined in the parent.
*/
public Object[] allKeys() {
int count = size();
ActionMap parent = getParent();
if (count == 0) {
if (parent != null) {
return parent.allKeys();
}
return keys();
}
if (parent == null) {
return keys();
}
Object[] keys = keys();
Object[] pKeys = parent.allKeys();
if (pKeys == null) {
return keys;
}
if (keys == null) {
// Should only happen if size() != keys.length, which should only
// happen if mutated from multiple threads (or a bogus subclass).
return pKeys;
}
HashMap<Object, Object> keyMap = new HashMap<Object, Object>();
int counter;
for (counter = keys.length - 1; counter >= 0; counter--) {
keyMap.put(keys[counter], keys[counter]);
}
for (counter = pKeys.length - 1; counter >= 0; counter--) {
keyMap.put(pKeys[counter], pKeys[counter]);
}
return keyMap.keySet().toArray();
}
private void writeObject(ObjectOutputStream s) throws IOException {
s.defaultWriteObject();
ArrayTable.writeArrayTable(s, arrayTable);
}
private void readObject(ObjectInputStream s) throws ClassNotFoundException,
IOException {
s.defaultReadObject();
for (int counter = s.readInt() - 1; counter >= 0; counter--) {
put(s.readObject(), (Action)s.readObject());
}
}
}