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This is a backport of OpenJFX 8 to run on Java 7.
The newest version!
/*
* Copyright (c) 2012, 2013, 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 com.sun.javafx.collections;
import com.sun.javafx.binding.ExpressionHelperBase;
import javafx.beans.InvalidationListener;
import javafx.collections.SetChangeListener;
import java.util.Arrays;
/**
*/
public abstract class SetListenerHelper extends ExpressionHelperBase {
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// Static methods
public static SetListenerHelper addListener(SetListenerHelper helper, InvalidationListener listener) {
if (listener == null) {
throw new NullPointerException();
}
return (helper == null)? new SingleInvalidation(listener) : helper.addListener(listener);
}
public static SetListenerHelper removeListener(SetListenerHelper helper, InvalidationListener listener) {
if (listener == null) {
throw new NullPointerException();
}
return (helper == null)? null : helper.removeListener(listener);
}
public static SetListenerHelper addListener(SetListenerHelper helper, SetChangeListener listener) {
if (listener == null) {
throw new NullPointerException();
}
return (helper == null)? new SingleChange(listener) : helper.addListener(listener);
}
public static SetListenerHelper removeListener(SetListenerHelper helper, SetChangeListener listener) {
if (listener == null) {
throw new NullPointerException();
}
return (helper == null)? null : helper.removeListener(listener);
}
public static void fireValueChangedEvent(SetListenerHelper helper, SetChangeListener.Change change) {
if (helper != null) {
helper.fireValueChangedEvent(change);
}
}
public static boolean hasListeners(SetListenerHelper helper) {
return helper != null;
}
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// Common implementations
protected abstract SetListenerHelper addListener(InvalidationListener listener);
protected abstract SetListenerHelper removeListener(InvalidationListener listener);
protected abstract SetListenerHelper addListener(SetChangeListener listener);
protected abstract SetListenerHelper removeListener(SetChangeListener listener);
protected abstract void fireValueChangedEvent(SetChangeListener.Change change);
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// Implementations
private static class SingleInvalidation extends SetListenerHelper {
private final InvalidationListener listener;
private SingleInvalidation(InvalidationListener listener) {
this.listener = listener;
}
@Override
protected SetListenerHelper addListener(InvalidationListener listener) {
return new Generic(this.listener, listener);
}
@Override
protected SetListenerHelper removeListener(InvalidationListener listener) {
return (listener.equals(this.listener))? null : this;
}
@Override
protected SetListenerHelper addListener(SetChangeListener listener) {
return new Generic(this.listener, listener);
}
@Override
protected SetListenerHelper removeListener(SetChangeListener listener) {
return this;
}
@Override
protected void fireValueChangedEvent(SetChangeListener.Change change) {
listener.invalidated(change.getSet());
}
}
private static class SingleChange extends SetListenerHelper {
private final SetChangeListener listener;
private SingleChange(SetChangeListener listener) {
this.listener = listener;
}
@Override
protected SetListenerHelper addListener(InvalidationListener listener) {
return new Generic(listener, this.listener);
}
@Override
protected SetListenerHelper removeListener(InvalidationListener listener) {
return this;
}
@Override
protected SetListenerHelper addListener(SetChangeListener listener) {
return new Generic(this.listener, listener);
}
@Override
protected SetListenerHelper removeListener(SetChangeListener listener) {
return (listener.equals(this.listener))? null : this;
}
@Override
protected void fireValueChangedEvent(SetChangeListener.Change change) {
listener.onChanged(change);
}
}
private static class Generic extends SetListenerHelper {
private InvalidationListener[] invalidationListeners;
private SetChangeListener[] changeListeners;
private int invalidationSize;
private int changeSize;
private boolean locked;
private Generic(InvalidationListener listener0, InvalidationListener listener1) {
this.invalidationListeners = new InvalidationListener[] {listener0, listener1};
this.invalidationSize = 2;
}
private Generic(SetChangeListener listener0, SetChangeListener listener1) {
this.changeListeners = new SetChangeListener[] {listener0, listener1};
this.changeSize = 2;
}
private Generic(InvalidationListener invalidationListener, SetChangeListener changeListener) {
this.invalidationListeners = new InvalidationListener[] {invalidationListener};
this.invalidationSize = 1;
this.changeListeners = new SetChangeListener[] {changeListener};
this.changeSize = 1;
}
@Override
protected Generic addListener(InvalidationListener listener) {
if (invalidationListeners == null) {
invalidationListeners = new InvalidationListener[] {listener};
invalidationSize = 1;
} else {
final int oldCapacity = invalidationListeners.length;
if (locked) {
final int newCapacity = (invalidationSize < oldCapacity)? oldCapacity : (oldCapacity * 3)/2 + 1;
invalidationListeners = Arrays.copyOf(invalidationListeners, newCapacity);
} else if (invalidationSize == oldCapacity) {
invalidationSize = trim(invalidationSize, invalidationListeners);
if (invalidationSize == oldCapacity) {
final int newCapacity = (oldCapacity * 3)/2 + 1;
invalidationListeners = Arrays.copyOf(invalidationListeners, newCapacity);
}
}
invalidationListeners[invalidationSize++] = listener;
}
return this;
}
@Override
protected SetListenerHelper removeListener(InvalidationListener listener) {
if (invalidationListeners != null) {
for (int index = 0; index < invalidationSize; index++) {
if (listener.equals(invalidationListeners[index])) {
if (invalidationSize == 1) {
if (changeSize == 1) {
return new SingleChange(changeListeners[0]);
}
invalidationListeners = null;
invalidationSize = 0;
} else if ((invalidationSize == 2) && (changeSize == 0)) {
return new SingleInvalidation(invalidationListeners[1-index]);
} else {
final int numMoved = invalidationSize - index - 1;
final InvalidationListener[] oldListeners = invalidationListeners;
if (locked) {
invalidationListeners = new InvalidationListener[invalidationListeners.length];
System.arraycopy(oldListeners, 0, invalidationListeners, 0, index);
}
if (numMoved > 0) {
System.arraycopy(oldListeners, index+1, invalidationListeners, index, numMoved);
}
invalidationSize--;
if (!locked) {
invalidationListeners[invalidationSize] = null; // Let gc do its work
}
}
break;
}
}
}
return this;
}
@Override
protected SetListenerHelper addListener(SetChangeListener listener) {
if (changeListeners == null) {
changeListeners = new SetChangeListener[] {listener};
changeSize = 1;
} else {
final int oldCapacity = changeListeners.length;
if (locked) {
final int newCapacity = (changeSize < oldCapacity)? oldCapacity : (oldCapacity * 3)/2 + 1;
changeListeners = Arrays.copyOf(changeListeners, newCapacity);
} else if (changeSize == oldCapacity) {
changeSize = trim(changeSize, changeListeners);
if (changeSize == oldCapacity) {
final int newCapacity = (oldCapacity * 3)/2 + 1;
changeListeners = Arrays.copyOf(changeListeners, newCapacity);
}
}
changeListeners[changeSize++] = listener;
}
return this;
}
@Override
protected SetListenerHelper removeListener(SetChangeListener listener) {
if (changeListeners != null) {
for (int index = 0; index < changeSize; index++) {
if (listener.equals(changeListeners[index])) {
if (changeSize == 1) {
if (invalidationSize == 1) {
return new SingleInvalidation(invalidationListeners[0]);
}
changeListeners = null;
changeSize = 0;
} else if ((changeSize == 2) && (invalidationSize == 0)) {
return new SingleChange(changeListeners[1-index]);
} else {
final int numMoved = changeSize - index - 1;
final SetChangeListener[] oldListeners = changeListeners;
if (locked) {
changeListeners = new SetChangeListener[changeListeners.length];
System.arraycopy(oldListeners, 0, changeListeners, 0, index);
}
if (numMoved > 0) {
System.arraycopy(oldListeners, index+1, changeListeners, index, numMoved);
}
changeSize--;
if (!locked) {
changeListeners[changeSize] = null; // Let gc do its work
}
}
break;
}
}
}
return this;
}
@Override
protected void fireValueChangedEvent(SetChangeListener.Change change) {
final InvalidationListener[] curInvalidationList = invalidationListeners;
final int curInvalidationSize = invalidationSize;
final SetChangeListener[] curChangeList = changeListeners;
final int curChangeSize = changeSize;
try {
locked = true;
for (int i = 0; i < curInvalidationSize; i++) {
curInvalidationList[i].invalidated(change.getSet());
}
for (int i = 0; i < curChangeSize; i++) {
curChangeList[i].onChanged(change);
}
} finally {
locked = false;
}
}
}
}