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/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.xbean.propertyeditor;

import java.beans.PropertyEditor;
import java.util.Collection;
import java.util.List;
import java.util.ArrayList;
import java.lang.reflect.Array;

/**
 * @version $Rev: 6687 $ $Date: 2005-12-28T21:08:56.733437Z $
 */
public abstract class AbstractCollectionConverter extends AbstractConverter {
    private final PropertyEditor editor;

    public AbstractCollectionConverter(Class type) {
        super(type);
        this.editor = new StringEditor();
    }

    public AbstractCollectionConverter(Class type, PropertyEditor editor) {
        super(type);

        if (editor == null) throw new NullPointerException("editor is null");
        this.editor = editor;
    }

    protected final Object toObjectImpl(String text) {
        List list = CollectionUtil.toList(text, editor);
        if (list == null) {
            return null;
        }
        Object collection = createCollection(list);
        return collection;
    }

    protected abstract Object createCollection(List list);

    protected final String toStringImpl(Object value) {
        Collection values;
        if (value.getClass().isArray()) {
            values = new ArrayList(Array.getLength(value));
            for (int i = 0; i < Array.getLength(value); i++) {
                values.add(Array.get(value, i));
            }
        } else {
            values = (Collection) value;
        }

        String text = CollectionUtil.toString(values, editor);
        return text;
    }
}