source: trunk/gcc/libjava/javax/swing/undo/CompoundEdit.java

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

This file is part of GNU Classpath.

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it under the terms of the GNU General Public License as published by
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package javax.swing.undo;

// Imports
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