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src/org/herac/tuxguitar/gui/undo/undoables/JoinedUndoable.java

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package org.herac.tuxguitar.gui.undo.undoables;

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import java.util.ArrayList;

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import java.util.List;

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import org.herac.tuxguitar.gui.undo.CannotRedoException;

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import org.herac.tuxguitar.gui.undo.CannotUndoException;

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import org.herac.tuxguitar.gui.undo.UndoableEdit;

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public class JoinedUndoable implements UndoableEdit{

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        private int doAction;

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        private UndoableCaretHelper undoCaret;

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        private UndoableCaretHelper redoCaret;          

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        private List undoables;

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        public JoinedUndoable(){

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                this.doAction = UNDO_ACTION;

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                this.undoCaret = new UndoableCaretHelper();

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                this.undoables = new ArrayList();

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        }

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        public void addUndoableEdit(UndoableEdit undoable){

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                this.undoables.add(undoable);

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        }

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        public void redo() throws CannotRedoException {

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                int count = this.undoables.size();

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                for(int i = 0;i < count;i++){

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                        UndoableEdit undoable = (UndoableEdit)this.undoables.get(i);

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                        undoable.redo();

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                }                       

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                this.redoCaret.update();

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                this.doAction = UNDO_ACTION;

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        }

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        public void undo() throws CannotUndoException {

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                int count = this.undoables.size();

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                for(int i = (count - 1);i >= 0;i--){

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                        UndoableEdit undoable = (UndoableEdit)this.undoables.get(i);

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                        undoable.undo();

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                }               

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                this.undoCaret.update();

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                this.doAction = REDO_ACTION;

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        }

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    public boolean canRedo() {

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        return (doAction == REDO_ACTION);

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    }

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    public boolean canUndo() {

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        return (doAction == UNDO_ACTION);

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    }

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    public JoinedUndoable endUndo(){

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        this.redoCaret = new UndoableCaretHelper();

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        return this;

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    }

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}

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