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 */
017package org.apache.xbean.propertyeditor;
018
019import java.beans.PropertyEditor;
020import java.util.Collection;
021import java.util.List;
022import java.util.ArrayList;
023import java.lang.reflect.Array;
024
025/**
026 * @version $Rev: 6687 $ $Date: 2005-12-28T21:08:56.733437Z $
027 */
028public 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}