com.cyclopsgroup.waterview.valves.RenderPageValve.java Source code

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Here is the source code for com.cyclopsgroup.waterview.valves.RenderPageValve.java

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/* ==========================================================================
 * Copyright 2002-2004 Cyclops Group Community
 * 
 * Licensed under the Open Software License, Version 2.1 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://opensource.org/licenses/osl-2.1.php
 *
 *  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 com.cyclopsgroup.waterview.valves;

import java.util.HashMap;
import java.util.Hashtable;
import java.util.Iterator;
import java.util.Map;
import java.util.regex.Pattern;

import org.apache.avalon.framework.activity.Initializable;
import org.apache.avalon.framework.configuration.Configurable;
import org.apache.avalon.framework.configuration.Configuration;
import org.apache.avalon.framework.configuration.ConfigurationException;
import org.apache.avalon.framework.logger.AbstractLogEnabled;
import org.apache.avalon.framework.service.ServiceException;
import org.apache.avalon.framework.service.ServiceManager;
import org.apache.avalon.framework.service.Serviceable;
import org.apache.commons.collections.map.ListOrderedMap;

import com.cyclopsgroup.waterview.DynaViewFactory;
import com.cyclopsgroup.waterview.ModuleManager;
import com.cyclopsgroup.waterview.Page;
import com.cyclopsgroup.waterview.PageRuntime;
import com.cyclopsgroup.waterview.PipelineContext;
import com.cyclopsgroup.waterview.Valve;

/**
 * Valve to render page
 * 
 * @author <a href="mailto:jiaqi.guo@gmail.com">Jiaqi Guo </a>
 */
public class RenderPageValve extends AbstractLogEnabled implements Valve, Configurable, Initializable, Serviceable {
    private ServiceManager serviceManager;

    private Map viewFactories = ListOrderedMap.decorate(new Hashtable());

    private transient Map viewFactoryRoles = ListOrderedMap.decorate(new HashMap());

    /**
     * Override or implement method of parent class or interface
     *
     * @see org.apache.avalon.framework.configuration.Configurable#configure(org.apache.avalon.framework.configuration.Configuration)
     */
    public void configure(Configuration conf) throws ConfigurationException {
        Configuration[] children = conf.getChild("view-factories").getChildren("view-factory");
        for (int i = 0; i < children.length; i++) {
            Configuration c = children[i];
            String pattern = c.getAttribute("pattern");
            String role = c.getAttribute("role");
            viewFactoryRoles.put(pattern, role);
        }
    }

    /**
     * Override or implement method of parent class or interface
     *
     * @see org.apache.avalon.framework.activity.Initializable#initialize()
     */
    public void initialize() throws Exception {
        for (Iterator i = viewFactoryRoles.keySet().iterator(); i.hasNext();) {
            String pattern = (String) i.next();
            String role = (String) viewFactoryRoles.get(pattern);
            DynaViewFactory viewFactory = (DynaViewFactory) serviceManager.lookup(role);
            registerViewFactory(pattern, viewFactory);
        }
    }

    /**
     * Override or implement method of parent class or interface
     *
     * @see com.cyclopsgroup.waterview.Valve#invoke(com.cyclopsgroup.waterview.PageRuntime, com.cyclopsgroup.waterview.PipelineContext)
     */
    public void invoke(PageRuntime runtime, PipelineContext context) throws Exception {
        DynaViewFactory viewFactory = null;
        for (Iterator i = viewFactories.keySet().iterator(); i.hasNext();) {
            String pattern = (String) i.next();
            if (Pattern.matches('^' + pattern + '$', runtime.getPage())) {
                viewFactory = (DynaViewFactory) viewFactories.get(pattern);
                break;
            }
        }
        if (viewFactory != null) {
            runtime.getPageContext().put(DynaViewFactory.NAME, viewFactory);
        }

        runtime.setOutputContentType("text/html");
        ModuleManager mm = (ModuleManager) runtime.getServiceManager().lookup(ModuleManager.ROLE);
        Page page = (Page) runtime.getPageContext().get(Page.NAME);
        if (page != null) {
            page.execute(runtime, runtime.getPageContext());
            mm.getDefaultFrame().execute(runtime, runtime.getPageContext());
            mm.getDefaultFrame().display(page, runtime);
        }
        context.invokeNextValve(runtime);
        runtime.getOutput().flush();
    }

    /**
     * Register a view factory
     *
     * @param pattern Pattern of page
     * @param viewFactory View factory object
     */
    public void registerViewFactory(String pattern, DynaViewFactory viewFactory) {
        viewFactories.put(pattern, viewFactory);
    }

    /**
     * Override or implement method of parent class or interface
     *
     * @see org.apache.avalon.framework.service.Serviceable#service(org.apache.avalon.framework.service.ServiceManager)
     */
    public void service(ServiceManager serviceManager) throws ServiceException {
        this.serviceManager = serviceManager;
    }
}