gcc/libjava/javax/swing/undo/CompoundEdit.java

/* AbstractTableModel.java --
   Copyright (C) 2002 Free Software Foundation, Inc.

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package javax.swing.undo;

import java.util.Vector;

/**
 * CompoundEdit
 * @author Andrew Selkirk
 */
public class CompoundEdit extends AbstractUndoableEdit {

	//-------------------------------------------------------------
	// Variables --------------------------------------------------
	//-------------------------------------------------------------

	/**
	 * The collection of UndoableEdits undone/redone en
	 * masse by this CompoundEdit
	 */
	protected	Vector	edits		= new Vector();

	/**
	 * TODO
	 */
	private		boolean	inProgress	= false;


	//-------------------------------------------------------------
	// Initialization ---------------------------------------------
	//-------------------------------------------------------------

	/**
	 * Create new Compound Edit
	 */
	public CompoundEdit() {
	} // CompoundEdit()


	//-------------------------------------------------------------
	// Interface: UndoableEdit ------------------------------------
	//-------------------------------------------------------------

	/**
	 * addEdit
	 * @param anEdit TODO
	 * @returns TODO
	 */
	public boolean addEdit(UndoableEdit anEdit) {

		// Variables
		UndoableEdit	lastEdit;

		if (inProgress == true) {

			// Get Last Edit
			lastEdit = lastEdit();

			// Check for null
			if (lastEdit != null) {

				if (lastEdit.addEdit(anEdit) == false) {
					if (lastEdit.replaceEdit(anEdit) == false) {
						edits.add(anEdit);
					}
				}

			} // if: lastEdit

			return true;

		} else {
			return false;
		}
	} // addEdit()

	/**
	 * canRedo
	 * @returns TODO
	 */
	public boolean canRedo() {
		if (isInProgress() == true || super.canRedo() == false) {
			return false;
		}
		return true;
	} // canRedo()

	/**
	 * canUndo
	 * @returns TODO
	 */
	public boolean canUndo() {
		if (isInProgress() == true || super.canUndo() == false) {
			return false;
		}
		return true;
	} // canUndo()

	/**
	 * die
	 */
	public void die() {

		// Variables
		int				index;
		UndoableEdit	current;

		// Loop through all contained UndoableEdits
		for (index = edits.size() - 1; index >= 0; index--) {
			current = (UndoableEdit) edits.elementAt(index);
			current.die();
		} // for: index

	} // die()

	/**
	 * end
	 */
	public void end() {
		inProgress = false;
	} // end()

	/**
	 * getPresentationName
	 * @returns TODO
	 */
	public String getPresentationName() {
		if (edits.size() == 0) {
			return super.getPresentationName();
		} else {
			return lastEdit().getPresentationName();
		}
	} // getPresentationName()

	/**
	 * getRedoPresentationName
	 * @returns TODO
	 */
	public String getRedoPresentationName()	{
		if (edits.size() == 0) {
			return super.getRedoPresentationName();
		} else {
			return lastEdit().getRedoPresentationName();
		}
	} // getRedoPresentationName()

	/**
	 * getUndoPresentationName
	 * @returns TODO
	 */
	public String getUndoPresentationName()	{
		if (edits.size() == 0) {
			return super.getUndoPresentationName();
		} else {
			return lastEdit().getUndoPresentationName();
		}
	} // getUndoPresentationName()

	/**
	 * isInProgress
	 * @returns TODO
	 */
	public boolean isInProgress() {
		return inProgress;
	} // isInProgress()


	/**
	 * isSignigicant
	 * @returns TODO
	 */
	public boolean isSignificant() {

		// Variables
		int				index;
		UndoableEdit	current;

		// Check each edit
		for (index = 0; index < edits.size(); index++) {
			current = (UndoableEdit) edits.elementAt(index);
			if (current.isSignificant() == true) {
				return true;
			}
		} // for: index

		return false;

	} // isSignificant()

	/**
	 * lastEdit
	 * @returns TODO
	 */
	protected UndoableEdit lastEdit() {
		if (edits.size() == 0) {
			return null;
		}
		return (UndoableEdit) edits.elementAt(edits.size() - 1);
	} // lastEdit()

	/**
	 * redo
	 * @throws CannotRedoException TODO
	 */
	public void redo() throws CannotRedoException {

		// Variables
		int				index;
		UndoableEdit	current;

		// Loop through all contained UndoableEdits
		for (index = 0; index < edits.size(); index++) {
			current = (UndoableEdit) edits.elementAt(index);
			current.redo();
		} // for: index

	} // redo()

	/**
	 * String representation
	 * @returns String representation
	 */
	public String toString() {
		return null; // TODO
	} // toString()

	/**
	 * undo
	 * @throws CannotUndoException TODO
	 */
	public void undo() throws CannotUndoException {

		// Variables
		int				index;
		UndoableEdit	current;

		// Loop through all contained UndoableEdits
		for (index = edits.size() - 1; index >= 0; index--) {
			current = (UndoableEdit) edits.elementAt(index);
			current.undo();
		} // for: index

	} // undo()


} // CompoundEdit