org.sakaiproject.metaobj.utils.mvc.impl.beans.AddableResourceBundleViewResolver.java Source code

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Here is the source code for org.sakaiproject.metaobj.utils.mvc.impl.beans.AddableResourceBundleViewResolver.java

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/**********************************************************************************
 * $URL: https://source.sakaiproject.org/svn/metaobj/trunk/metaobj-util/tool-lib/src/java/org/sakaiproject/metaobj/utils/mvc/impl/beans/AddableResourceBundleViewResolver.java $
 * $Id: AddableResourceBundleViewResolver.java 105079 2012-02-24 23:08:11Z ottenhoff@longsight.com $
 ***********************************************************************************
 *
 * Copyright (c) 2004, 2005, 2006, 2008 The Sakai Foundation
 *
 * Licensed under the Educational Community 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.opensource.org/licenses/ECL-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.sakaiproject.metaobj.utils.mvc.impl.beans;

import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.MissingResourceException;
import java.util.ResourceBundle;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.config.ConfigurableBeanFactory;
import org.springframework.beans.factory.support.DefaultListableBeanFactory;
import org.springframework.beans.factory.support.PropertiesBeanDefinitionReader;
import org.springframework.core.io.Resource;
import org.springframework.core.io.ResourceEditor;
import org.springframework.web.servlet.view.ResourceBundleViewResolver;

public class AddableResourceBundleViewResolver extends ResourceBundleViewResolver {
    protected final transient Log logger = LogFactory.getLog(getClass());

    private List baseNames;
    private Map cachedFactories = new HashMap();
    private String defaultParentView;

    public List getBaseNames() {
        return baseNames;
    }

    public void setBaseNames(List baseNames) {
        this.baseNames = baseNames;
    }

    /**
     * Set the default parent for views defined in the ResourceBundle.
     * This avoids repeated "yyy1.parent=xxx", "yyy2.parent=xxx" definitions
     * in the bundle, especially if all defined views share the same parent.
     * <p>The parent will typically define the view class and common attributes.
     * Concrete views might simply consist of an URL definition then:
     * a la "yyy1.url=/my.jsp", "yyy2.url=/your.jsp".
     * <p>View definitions that define their own parent or carry their own
     * class can still override this. Strictly speaking, the rule that a
     * default parent setting does not apply to a bean definition that
     * carries a class is there for backwards compatiblity reasons.
     * It still matches the typical use case.
     *
     * @param defaultParentView the default parent view
     */
    public synchronized void setDefaultParentView(String defaultParentView) {
        this.defaultParentView = defaultParentView;
    }

    /**
     * Initialize the BeanFactory from the ResourceBundle, for the given locale.
     * Synchronized because of access by parallel threads.
     */
    protected synchronized BeanFactory initFactory(Locale locale) throws MissingResourceException, BeansException {
        BeanFactory parsedBundle = isCache() ? (BeanFactory) this.cachedFactories.get(locale) : null;
        if (parsedBundle != null) {
            return parsedBundle;
        }

        DefaultListableBeanFactory factory = new DefaultListableBeanFactory(getApplicationContext());
        PropertiesBeanDefinitionReader reader = new PropertiesBeanDefinitionReader(factory);
        reader.setDefaultParentBean(this.defaultParentView);
        for (Iterator i = baseNames.iterator(); i.hasNext();) {
            ResourceBundle bundle = ResourceBundle.getBundle((String) i.next(), locale,
                    Thread.currentThread().getContextClassLoader());
            reader.registerBeanDefinitions(bundle);
        }
        factory.registerCustomEditor(Resource.class, new ResourceEditor(getApplicationContext()));

        if (isCache()) {
            factory.preInstantiateSingletons();
            this.cachedFactories.put(locale, factory);
        }
        return factory;
    }

    public void destroy() throws BeansException {
        for (Iterator it = this.cachedFactories.values().iterator(); it.hasNext();) {
            ConfigurableBeanFactory factory = (ConfigurableBeanFactory) it.next();
            factory.destroySingletons();
        }
        this.cachedFactories.clear();
    }

}