/*
* Copyright (c) 2014, Michael
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of the jo-widgets.org nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL jo-widgets.org BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
* DAMAGE.
*/
package org.jowidgets.impl.clipboard;
import java.util.LinkedHashSet;
import java.util.LinkedList;
import java.util.Set;
import org.jowidgets.api.clipboard.IClipboardListener;
import org.jowidgets.api.clipboard.IClipboardObservable;
import org.jowidgets.util.Assert;
import org.jowidgets.util.event.IObservableCallback;
class ClipboardObservable implements IClipboardObservable {
private final Set<IClipboardListener> listeners;
private final IObservableCallback observableCallback;
ClipboardObservable(final IObservableCallback observableCallback) {
Assert.paramNotNull(observableCallback, "observableCallback");
this.observableCallback = observableCallback;
this.listeners = new LinkedHashSet<IClipboardListener>();
}
@Override
public final void addClipboardListener(final IClipboardListener listener) {
Assert.paramNotNull(listener, "listener");
final int lastSize = listeners.size();
listeners.add(listener);
if (lastSize == 0) {
observableCallback.onFirstRegistered();
}
}
@Override
public final void removeClipboardListener(final IClipboardListener listener) {
Assert.paramNotNull(listener, "listener");
final int lastSize = listeners.size();
listeners.remove(listener);
if (lastSize > 0 && listeners.size() == 0) {
observableCallback.onLastUnregistered();
}
}
public final void fireClipboardChanged() {
for (final IClipboardListener listener : new LinkedList<IClipboardListener>(listeners)) {
listener.clipboardChanged();
}
}
}