001    /**
002     *  Licensed to the Apache Software Foundation (ASF) under one or more
003     *  contributor license agreements.  See the NOTICE file distributed with
004     *  this work for additional information regarding copyright ownership.
005     *  The ASF licenses this file to You under the Apache License, Version 2.0
006     *  (the "License"); you may not use this file except in compliance with
007     *  the License.  You may obtain a copy of the License at
008     *
009     *     http://www.apache.org/licenses/LICENSE-2.0
010     *
011     *  Unless required by applicable law or agreed to in writing, software
012     *  distributed under the License is distributed on an "AS IS" BASIS,
013     *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014     *  See the License for the specific language governing permissions and
015     *  limitations under the License.
016     */
017    package org.apache.geronimo.common.propertyeditor;
018    
019    import java.beans.PropertyEditorSupport;
020    import java.util.Collection;
021    import java.util.StringTokenizer;
022    
023    /**
024     * An abstract collection editor.  Subclasses should provide the correct type of collection from
025     * the createCollection method and should override setValue to check the type of the value.
026     *
027     * @version $Rev: 476049 $ $Date: 2006-11-16 23:35:17 -0500 (Thu, 16 Nov 2006) $
028     */
029    public abstract class AbstractCollectionEditor extends PropertyEditorSupport {
030    
031        /**
032         * Concrete subclasses should implement this method to create the correct type of collection.
033         *
034         * @return an empty instance of the type of collection  the subclass edits.
035         */
036        protected abstract Collection createCollection();
037    
038        public void setAsText(String text) {
039            if (text == null) {
040                setValue(null);
041            } else {
042                if (text.startsWith("[")) {
043                    text = text.substring(1);
044                }
045                if (text.endsWith("]")) {
046                    text = text.substring(0, text.length() - 1);
047                }
048                Collection collection = createCollection();
049                StringTokenizer stok = new StringTokenizer(text, ",");
050    
051                while (stok.hasMoreTokens()) {
052                    collection.add(stok.nextToken().trim());
053                }
054    
055                setValue(collection);
056            }
057        }
058    }