com.googlecode.jsfFlex.renderkit.html.util.JsfFlexResourceImpl.java Source code

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Here is the source code for com.googlecode.jsfFlex.renderkit.html.util.JsfFlexResourceImpl.java

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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 com.googlecode.jsfFlex.renderkit.html.util;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.util.Collection;
import java.util.LinkedHashSet;
import java.util.LinkedList;
import java.util.List;
import java.util.Set;

import javax.servlet.http.HttpServletResponse;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import com.googlecode.jsfFlex.shared.util.FlexConstants;

/**
 * @author Ji Hoon Kim
 */
class JsfFlexResourceImpl extends AbstractJsfFlexResource {

    private static final Log _log = LogFactory.getLog(JsfFlexResourceImpl.class);

    private static final String RESOURCE_DIRECTORY_NAME = "resource";

    private final Set<JsfFlexResourceElement> _resourceSet;

    JsfFlexResourceImpl() {
        super();
        _resourceSet = new LinkedHashSet<JsfFlexResourceElement>();
    }

    @Override
    public void addResource(Class jsfFlexComponent, String resourceName) {
        _resourceSet.add(new JsfFlexResourceElement(jsfFlexComponent, resourceName));
    }

    @Override
    public Collection<String> getResources() {

        List<String> resourceList = new LinkedList<String>();
        for (JsfFlexResourceElement currResourceElement : _resourceSet) {
            resourceList.add(currResourceElement.generateResourcePath());
        }

        return resourceList;
    }

    @Override
    public void processRequestResource(HttpServletResponse httpResponse, String[] requestURISplitted) {

        /*
         * need to get the resource as stream and flush it out using httpResponse
         *  The key should be [3] + [4] where :
         *     [3]   =   name of the packaged class where the resource lives [use it for loading the resource]
         *     [4] =   name of the resource file
         */

        Class resourceClass = null;

        try {
            resourceClass = Class.forName(requestURISplitted[3]);
        } catch (ClassNotFoundException classNotFound) {
            _log.debug("Class Not found for " + requestURISplitted[3], classNotFound);
        }

        StringBuilder resourcePath = new StringBuilder(RESOURCE_DIRECTORY_NAME);
        resourcePath.append("/");

        for (int i = 4; i < requestURISplitted.length; i++) {
            resourcePath.append(requestURISplitted[i]);

            if ((i + 1) < requestURISplitted.length) {
                resourcePath.append("/");
            }
        }

        InputStream resourceStream = resourceClass.getResourceAsStream(resourcePath.toString());

        readInputWriteOutput(resourceStream, httpResponse);

    }

    private void readInputWriteOutput(InputStream resourceStream, HttpServletResponse httpResponse) {

        PrintWriter responseWriter = null;

        try {
            responseWriter = httpResponse.getWriter();

            BufferedReader reader = new BufferedReader(new InputStreamReader(resourceStream));

            char[] charBuffer = new char[2048];
            int offSet = 0;
            while ((offSet = reader.read(charBuffer, 0, 2048)) > -1) {
                responseWriter.write(charBuffer, 0, offSet);
            }

            responseWriter.flush();
        } catch (IOException ioException) {
            _log.debug("IOException while writing the script's content to PrintWriter of HttpServletResponse",
                    ioException);
        }

    }

    private final class JsfFlexResourceElement {

        private final Class _jsfFlexComponent;
        private final String _resourceName;

        private final int HASH_CODE_VAL;

        private JsfFlexResourceElement() {
            super();
            _jsfFlexComponent = null;
            _resourceName = null;
            HASH_CODE_VAL = -1;
        }

        private JsfFlexResourceElement(Class jsfFlexComponent, String resourceName) {
            super();
            _jsfFlexComponent = jsfFlexComponent;
            _resourceName = resourceName;
            int hashCodeVal = FlexConstants.HASH_CODE_INIT_VALUE;
            hashCodeVal = FlexConstants.HASH_CODE_MULTIPLY_VALUE * hashCodeVal
                    + _jsfFlexComponent.getPackage().getName().hashCode();
            hashCodeVal = FlexConstants.HASH_CODE_MULTIPLY_VALUE * hashCodeVal
                    + _jsfFlexComponent.getName().hashCode();
            hashCodeVal = FlexConstants.HASH_CODE_MULTIPLY_VALUE * hashCodeVal + _resourceName.hashCode();
            HASH_CODE_VAL = hashCodeVal;
        }

        public String generateResourcePath() {
            StringBuilder resourcePath = new StringBuilder();

            resourcePath.append(JSF_FLEX_SCRIPT_RESOURCE_REQUEST_PREFIX);
            resourcePath.append("/");
            resourcePath.append(_jsfFlexComponent.getPackage().getName());
            resourcePath.append(".");
            resourcePath.append(_jsfFlexComponent.getSimpleName());
            resourcePath.append("/");
            resourcePath.append(_resourceName);

            return resourcePath.toString();
        }

        @Override
        public boolean equals(Object instance) {
            if (!(instance instanceof JsfFlexResourceElement)) {
                return false;
            }

            JsfFlexResourceElement jsfFlexResourceElementInstance = JsfFlexResourceElement.class.cast(instance);

            return _jsfFlexComponent.getPackage().getName()
                    .equals(jsfFlexResourceElementInstance._jsfFlexComponent.getPackage().getName())
                    && _resourceName.equals(jsfFlexResourceElementInstance._resourceName);
        }

        @Override
        public int hashCode() {
            return HASH_CODE_VAL;
        }

    }

}