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.xbean.propertyeditor;
018    
019    import java.beans.PropertyEditor;
020    import java.util.Collection;
021    import java.util.List;
022    import java.util.ArrayList;
023    import java.lang.reflect.Array;
024    
025    /**
026     * @version $Rev: 6687 $ $Date: 2005-12-28T21:08:56.733437Z $
027     */
028    public abstract class AbstractCollectionConverter extends AbstractConverter {
029        private final PropertyEditor editor;
030    
031        public AbstractCollectionConverter(Class type) {
032            super(type);
033            this.editor = new StringEditor();
034        }
035    
036        public AbstractCollectionConverter(Class type, PropertyEditor editor) {
037            super(type);
038    
039            if (editor == null) throw new NullPointerException("editor is null");
040            this.editor = editor;
041        }
042    
043        protected final Object toObjectImpl(String text) {
044            List list = CollectionUtil.toList(text, editor);
045            if (list == null) {
046                return null;
047            }
048            Object collection = createCollection(list);
049            return collection;
050        }
051    
052        protected abstract Object createCollection(List list);
053    
054        protected final String toStringImpl(Object value) {
055            Collection values;
056            if (value.getClass().isArray()) {
057                values = new ArrayList(Array.getLength(value));
058                for (int i = 0; i < Array.getLength(value); i++) {
059                    values.add(Array.get(value, i));
060                }
061            } else {
062                values = (Collection) value;
063            }
064    
065            String text = CollectionUtil.toString(values, editor);
066            return text;
067        }
068    }