org.apache.tiles.ognl.TilesContextPropertyAccessorDelegateFactory Maven / Gradle / Ivy

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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: TilesContextPropertyAccessorDelegateFactory.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.PropertyAccessor;

import org.apache.tiles.TilesApplicationContext;
import org.apache.tiles.context.TilesRequestContext;
import org.apache.tiles.util.CombinedBeanInfo;

/**
 * Decides the appropriate {@link PropertyAccessor} for the given property name
 * and {@link TilesRequestContext}.
 *
 * @version $Rev: 817009 $ $Date: 2009-09-20 13:26:26 +0200 (dom, 20 set 2009) $
 * @since 2.2.0
 */
public class TilesContextPropertyAccessorDelegateFactory implements
        PropertyAccessorDelegateFactory {

    /**
     * The plain object property accessor, to be used directly for
     * {@link TilesRequestContext}.
     */
    private PropertyAccessor objectPropertyAccessor;

    /**
     * The application context property accessor.
     */
    private PropertyAccessor applicationContextPropertyAccessor;

    /**
     * The request scope property accessor.
     */
    private PropertyAccessor requestScopePropertyAccessor;

    /**
     * The session scope property accessor.
     */
    private PropertyAccessor sessionScopePropertyAccessor;

    /**
     * The application scope property accessor.
     */
    private PropertyAccessor applicationScopePropertyAccessor;

    /**
     * The bean info of {@link TilesRequestContext} and
     * {@link org.apache.tiles.TilesApplicationContext}.
     */
    private CombinedBeanInfo beanInfo;

    /**
     * Constructor.
     *
     * @param objectPropertyAccessor The plain object property accessor, to be
     * used directly for {@link TilesRequestContext}.
     * @param applicationContextPropertyAccessor The application context
     * property accessor.
     * @param requestScopePropertyAccessor The request scope property accessor.
     * @param sessionScopePropertyAccessor The session scope property accessor.
     * @param applicationScopePropertyAccessor The application scope property
     * accessor.
     * @since 2.2.0
     */
    public TilesContextPropertyAccessorDelegateFactory(
            PropertyAccessor objectPropertyAccessor,
            PropertyAccessor applicationContextPropertyAccessor,
            PropertyAccessor requestScopePropertyAccessor,
            PropertyAccessor sessionScopePropertyAccessor,
            PropertyAccessor applicationScopePropertyAccessor) {
        beanInfo = new CombinedBeanInfo(TilesRequestContext.class, TilesApplicationContext.class);
        this.objectPropertyAccessor = objectPropertyAccessor;
        this.applicationContextPropertyAccessor = applicationContextPropertyAccessor;
        this.requestScopePropertyAccessor = requestScopePropertyAccessor;
        this.sessionScopePropertyAccessor = sessionScopePropertyAccessor;
        this.applicationScopePropertyAccessor = applicationScopePropertyAccessor;
    }

    /** {@inheritDoc} */
    public PropertyAccessor getPropertyAccessor(String propertyName,
            TilesRequestContext request) {
        PropertyAccessor retValue;
        if (beanInfo.getMappedDescriptors(TilesRequestContext.class)
                .containsKey(propertyName)) {
            retValue = objectPropertyAccessor;
        } else if (beanInfo.getMappedDescriptors(TilesApplicationContext.class)
                .containsKey(propertyName)) {
            retValue = applicationContextPropertyAccessor;
        } else {
            Map scopeMap = request.getRequestScope();
            if (scopeMap.containsKey(propertyName)) {
                retValue = requestScopePropertyAccessor;
            } else {
                scopeMap = request.getSessionScope();
                if (scopeMap.containsKey(propertyName)) {
                    retValue = sessionScopePropertyAccessor;
                } else {
                    scopeMap = request.getApplicationContext()
                            .getApplicationScope();
                    if (scopeMap.containsKey(propertyName)) {
                        retValue = applicationScopePropertyAccessor;
                    } else {
                        retValue = requestScopePropertyAccessor;
                    }
                }
            }
        }
        return retValue;
    }
}