org.richfaces.view.facelets.html.AttachQueueStack Maven / Gradle / Ivy
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* Copyright 2010, Red Hat, Inc. and individual contributors
* by the @authors tag. See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.richfaces.view.facelets.html;
import java.util.LinkedList;
import java.util.Map;
import javax.faces.context.FacesContext;
/**
* @author Nick Belaevski
*
*/
final class AttachQueueStack {
private static final String STACK_ATTRIBUTE_NAME = "org.richfaces.AttachQueueStack";
private LinkedList stack = null;
public AttachQueueStack() {
stack = new LinkedList();
}
public static AttachQueueStack getStack(FacesContext context, boolean createIfNull) {
Map attributes = context.getAttributes();
AttachQueueStack attachQueueStack = (AttachQueueStack) attributes.get(STACK_ATTRIBUTE_NAME);
if (attachQueueStack == null && createIfNull) {
attachQueueStack = new AttachQueueStack();
attributes.put(STACK_ATTRIBUTE_NAME, attachQueueStack);
}
return attachQueueStack;
}
public void push(AttachQueueInfo info) {
stack.addFirst(info);
}
public AttachQueueInfo pop() {
return stack.removeFirst();
}
public AttachQueueInfo peek() {
if (!stack.isEmpty()) {
return stack.getFirst();
} else {
return null;
}
}
}