svn-gvsig-desktop / branches / v2_0_0_prep / libraries / libTools / src / org / gvsig / tools / undo / command / impl / DefaultUndoRedoCommandStack.java @ 24961
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package org.gvsig.tools.undo.command.impl; |
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import java.util.ArrayList; |
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import java.util.List; |
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import java.util.Stack; |
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import org.gvsig.tools.observer.Observer; |
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import org.gvsig.tools.observer.impl.DelegateWeakReferencingObservable; |
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import org.gvsig.tools.undo.RedoException; |
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import org.gvsig.tools.undo.UndoException; |
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import org.gvsig.tools.undo.command.Command; |
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import org.gvsig.tools.undo.command.CommandNotification; |
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import org.gvsig.tools.undo.command.UndoRedoCommandStack; |
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/**
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* Clase en memoria para registrar y gestionar los comandos que vamos
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* realizando. La forma en que ha sido implementada esta clase, en vez de una
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* ?nica lista para albergar los comandos de deshacer(undos) y los de
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* rehacer(redos), se ha optado por dos pilas una para deshacer(undos) y otra
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* para rehacer(redos), de esta forma : Cuando se a?ade un nuevo comando, se
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* inserta este a la pila de deshacer(undos) y se borra de la de rehacer(redos).
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* Si se realiza un deshacer se desapila este comando de la pila deshacer(undos)
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* y se apila en la de rehacer(redos). Y de la misma forma cuando se realiza un
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* rehacer se desapila este comando de la pila de rehacer(redos) y pasa a la de
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* deshacer(undos).
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*
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* @author Vicente Caballero Navarro
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*/
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public class DefaultUndoRedoCommandStack implements UndoRedoCommandStack { |
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private Stack undos = new Stack(); |
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private Stack redos = new Stack(); |
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private DelegateWeakReferencingObservable delegateObservable = new DelegateWeakReferencingObservable( |
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this);
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private boolean complex = false; |
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private CompoundCommand collection = null; |
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public void add(Command command) { |
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if (complex) {
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collection.add(command); |
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} else {
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undos.add(command); |
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redos.clear(); |
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delegateObservable.notifyObservers(new DefaultCommandNotification(
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command, CommandNotification.ADD)); |
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} |
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} |
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public void undo() throws UndoException { |
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AbstractCommand command = (AbstractCommand) undos.pop(); |
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command.undo(); |
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redos.add(command); |
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delegateObservable.notifyObservers(new DefaultCommandNotification(
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command, CommandNotification.UNDO)); |
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} |
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public void redo() throws RedoException { |
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AbstractCommand command = (AbstractCommand) redos.pop(); |
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command.redo(); |
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undos.add(command); |
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delegateObservable.notifyObservers(new DefaultCommandNotification(
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command, CommandNotification.REDO)); |
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} |
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public void redo(int commands) throws RedoException { |
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for (int i = 0; i < commands; i++) { |
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redo(); |
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} |
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} |
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public void undo(int commands) throws UndoException { |
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for (int i = 0; i < commands; i++) { |
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undo(); |
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} |
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} |
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public boolean canUndo() { |
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return (!undos.isEmpty());
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} |
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public boolean canRedo() { |
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return (!redos.isEmpty());
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} |
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public List getUndoInfos() { |
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Stack clonedUndos = (Stack) undos.clone(); |
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ArrayList commands = new ArrayList(); |
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while (!clonedUndos.isEmpty()) {
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commands.add(clonedUndos.pop()); |
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} |
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return commands;
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} |
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public List getRedoInfos() { |
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Stack clonedRedos = (Stack) redos.clone(); |
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ArrayList commands = new ArrayList(); |
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while (!clonedRedos.isEmpty()) {
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commands.add(clonedRedos.pop()); |
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} |
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return commands;
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} |
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public int size() { |
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return undos.size() + redos.size();
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} |
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public void clear() { |
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redos.clear(); |
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undos.clear(); |
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} |
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public Command getNextUndoCommand() {
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return (Command) undos.peek();
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} |
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public Command getNextRedoCommand() {
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return (Command) redos.peek();
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} |
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public void addObserver(Observer o) { |
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delegateObservable.addObserver(o); |
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} |
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public void deleteObserver(Observer o) { |
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delegateObservable.deleteObserver(o); |
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} |
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public void deleteObservers() { |
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delegateObservable.deleteObservers(); |
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} |
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public void endComplex() { |
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if (collection.isEmpty()) {
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complex = false;
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return;
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} |
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complex = false;
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undos.add(collection); |
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redos.clear(); |
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delegateObservable.notifyObservers(new DefaultCommandNotification(
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collection, CommandNotification.ADD)); |
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} |
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public void startComplex(String description) { |
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collection = new CompoundCommand(description);
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complex = true;
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} |
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} |