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Tiles OGNL support: Classes and tag libraries to use OGNL as an expression language in attribute expressions.
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/*
 * $Id: NestedObjectDelegatePropertyAccessor.java 817009 2009-09-20 11:26:26Z apetrelli $
 *
 * 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.tiles.ognl;

import java.util.Map;

import ognl.OgnlContext;
import ognl.OgnlException;
import ognl.PropertyAccessor;

/**
 * Uses a {@link PropertyAccessor} as a delegate, but passing a nested object as
 * target.
 *
 * @param  The root object type from which the target object will be
 * extracted.
 * @since 2.2.0
 * @version $Rev: 817009 $ $Date: 2009-09-20 13:26:26 +0200 (dom, 20 set 2009) $
 */
public class NestedObjectDelegatePropertyAccessor implements
        PropertyAccessor {

    /**
     * The extractor of the nested object.
     *
     * @since 2.2.0
     */
    private NestedObjectExtractor nestedObjectExtractor;

    /**
     * The delegated property accessor.
     *
     * @since 2.2.0
     */
    private PropertyAccessor propertyAccessor;

    /**
     * Constructor.
     *
     * @param nestedObjectExtractor The extractor of the nested object.
     * @param propertyAccessor The delegated property accessor.
     * @since 2.2.0
     */
    public NestedObjectDelegatePropertyAccessor(
            NestedObjectExtractor nestedObjectExtractor,
            PropertyAccessor propertyAccessor) {
        this.nestedObjectExtractor = nestedObjectExtractor;
        this.propertyAccessor = propertyAccessor;
    }

    /** {@inheritDoc} */
    @SuppressWarnings("unchecked")
    public Object getProperty(Map context, Object target, Object name)
            throws OgnlException {
        return propertyAccessor.getProperty(context, nestedObjectExtractor
                .getNestedObject((T) target), name);
    }

    /** {@inheritDoc} */
    @SuppressWarnings("unchecked")
    public void setProperty(Map context, Object target, Object name,
            Object value) throws OgnlException {
        propertyAccessor.setProperty(context, nestedObjectExtractor
                .getNestedObject((T) target), name, value);
    }

    /** {@inheritDoc} */
    @SuppressWarnings("unchecked")
    public String getSourceAccessor(OgnlContext context, Object target,
            Object index) {
        return propertyAccessor.getSourceAccessor(context,
                nestedObjectExtractor.getNestedObject((T) target), index);
    }

    /** {@inheritDoc} */
    @SuppressWarnings("unchecked")
    public String getSourceSetter(OgnlContext context, Object target,
            Object index) {
        return propertyAccessor.getSourceSetter(context, nestedObjectExtractor
                .getNestedObject((T) target), index);
    }
}