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Free Java Reporting Library
/*
* JasperReports - Free Java Reporting Library.
* Copyright (C) 2001 - 2019 TIBCO Software Inc. All rights reserved.
* http://www.jaspersoft.com
*
* Unless you have purchased a commercial license agreement from Jaspersoft,
* the following license terms apply:
*
* This program is part of JasperReports.
*
* JasperReports 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 3 of the License, or
* (at your option) any later version.
*
* JasperReports 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 JasperReports. If not, see .
*/
package net.sf.jasperreports.web.commands;
import java.io.Serializable;
import java.util.LinkedList;
import net.sf.jasperreports.engine.JRConstants;
/**
* @author Narcis Marcu ([email protected])
*/
public class CommandStack implements Serializable {
private static final long serialVersionUID = JRConstants.SERIAL_VERSION_UID;
private LinkedList commandStack = new LinkedList();
private LinkedList redoStack = new LinkedList();
public void execute(Command command) throws CommandException{
try {
command.execute();
} catch (CommandException e) {
command.undo();
throw e;
}
commandStack.addFirst(command);
redoStack.clear();
}
public void undo() {
if (commandStack.isEmpty()) {
return;
}
Command command = commandStack.removeFirst();
command.undo();
redoStack.addFirst(command);
}
public void redo() {
if (redoStack.isEmpty()) {
return;
}
Command command = redoStack.removeFirst();
command.redo();
commandStack.addFirst(command);
}
public void undoAll() {
if (commandStack.isEmpty()) {
return;
}
while (!commandStack.isEmpty()) {
undo();
}
}
public void redoAll() {
if (redoStack.isEmpty()) {
return;
}
while (!redoStack.isEmpty()) {
redo();
}
}
public void clear()
{
commandStack.clear();
redoStack.clear();
}
public int getExecutionStackSize() {
return commandStack.size();
}
}