001    /*
002     * Copyright 2002-2007 the original author or authors.
003     * 
004     * Licensed under the Apache License, Version 2.0 (the "License"); you may not
005     * use this file except in compliance with the License. You may obtain a copy of
006     * the License at
007     * 
008     * http://www.apache.org/licenses/LICENSE-2.0
009     * 
010     * Unless required by applicable law or agreed to in writing, software
011     * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
012     * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
013     * License for the specific language governing permissions and limitations under
014     * the License.
015     */
016    package org.springframework.richclient.progress;
017    
018    import javax.swing.tree.TreePath;
019    
020    import org.springframework.richclient.application.statusbar.StatusBar;
021    import org.springframework.richclient.tree.TreeSelectionListenerSupport;
022    import org.springframework.util.Assert;
023    
024    public abstract class TreeStatusBarUpdater extends TreeSelectionListenerSupport {
025        private StatusBar statusBar;
026    
027        public TreeStatusBarUpdater(StatusBar statusBar) {
028            Assert.notNull(statusBar);
029            this.statusBar = statusBar;
030        }
031    
032        private StatusBar getStatusBar() {
033            return statusBar;
034        }
035    
036        protected void onSingleSelection(TreePath newPath) {
037            updateStatusBar(getSelectedObjectName());
038        }
039    
040        protected abstract String getSelectedObjectName();
041    
042        protected void onMultiSelection(TreePath[] newPaths) {
043            updateStatusBar(getItemsSelected());
044        }
045    
046        protected void onNoSelection() {
047            updateStatusBar(null);
048        }
049    
050        private void updateStatusBar(int itemsSelected) {
051            getStatusBar().setMessage(itemsSelected + " items selected");
052        }
053    
054        private void updateStatusBar(String selectedObjectName) {
055            if (selectedObjectName != null) {
056                getStatusBar().setMessage(selectedObjectName);
057            }
058            else {
059                getStatusBar().setMessage((String)null);
060            }
061        }
062    }