RequestRouter.java

/*
 * Copyright © 2008, 2012 Pedro Agulló Soliveres.
 * 
 * This file is part of DirectJNgine.
 *
 * DirectJNgine is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License.
 *
 * Commercial use is permitted to the extent that the code/component(s)
 * do NOT become part of another Open Source or Commercially developed
 * licensed development library or toolkit without explicit permission.
 *
 * DirectJNgine is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with DirectJNgine.  If not, see <http://www.gnu.org/licenses/>.
 * 
 * This software uses the ExtJs library (http://extjs.com), which is 
 * distributed under the GPL v3 license (see http://extjs.com/license).
 */

package com.softwarementors.extjs.djn.router;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.PrintWriter;
import java.io.Reader;
import java.io.Writer;
import java.util.List;

import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.log4j.Logger;

import com.softwarementors.extjs.djn.api.Registry;
import com.softwarementors.extjs.djn.config.GlobalConfiguration;
import com.softwarementors.extjs.djn.router.dispatcher.Dispatcher;
import com.softwarementors.extjs.djn.router.processor.RequestException;
import com.softwarementors.extjs.djn.router.processor.poll.PollRequestProcessor;
import com.softwarementors.extjs.djn.router.processor.standard.form.simple.SimpleFormPostRequestProcessor;
import com.softwarementors.extjs.djn.router.processor.standard.form.upload.UploadFormPostRequestProcessor;
import com.softwarementors.extjs.djn.router.processor.standard.json.JsonRequestProcessor;

import edu.umd.cs.findbugs.annotations.NonNull;

public class RequestRouter {
  @NonNull
  static final Logger logger = Logger.getLogger( RequestRouter.class );
  
  private @NonNull Registry registry;
  private @NonNull Dispatcher dispatcher;
  private @NonNull GlobalConfiguration globalConfiguration;
   
  public RequestRouter( Registry registry, GlobalConfiguration globalConfiguration, Dispatcher dispatcher ) {
    assert registry != null;
    assert globalConfiguration != null;
    assert dispatcher != null;
    
    this.registry = registry;
    this.dispatcher = dispatcher;
    this.globalConfiguration = globalConfiguration;
  }

  public void processSimpleFormPostRequest(Reader reader, Writer writer) throws IOException {
    new SimpleFormPostRequestProcessor( this.registry, this.dispatcher, this.globalConfiguration).process( reader, writer );
  }

  public UploadFormPostRequestProcessor createUploadFromProcessor() {
    return new UploadFormPostRequestProcessor( this.registry, this.dispatcher, this.globalConfiguration);
  }
  
  public void processUploadFormPostRequest(UploadFormPostRequestProcessor processor, List<FileItem> fileItems, Writer writer ) throws IOException {
    assert processor != null;
    
    processor.process( fileItems, writer );
  }

  public void processJsonRequest(Reader reader, Writer writer) throws IOException {
    new JsonRequestProcessor(this.registry, this.dispatcher, this.globalConfiguration).process(reader, writer);
  }

  public void processPollRequest(Reader reader, Writer writer, String pathInfo) throws IOException {
    new PollRequestProcessor(this.registry, this.dispatcher, this.globalConfiguration).process(reader, writer, pathInfo);
  }

  public void handleFileUploadException(UploadFormPostRequestProcessor processor, FileUploadException e) {
    assert e != null;
    
    processor.handleFileUploadException(e);
  }

  public static final String SOURCE_NAME_PREFIX= "/src";
  
  public void processSourceRequest(BufferedReader reader, PrintWriter writer, String pathInfo) {
    assert reader != null; 
    assert writer != null;
    assert pathInfo != null;
    
    int lastIndex = pathInfo.lastIndexOf(SOURCE_NAME_PREFIX);
    int position = lastIndex + SOURCE_NAME_PREFIX.length();
    String sourceName = pathInfo.substring(position + 1);
    if( !this.registry.hasSource(sourceName)) {
      RequestException ex = RequestException.forSourceNotFound(sourceName);
      logger.error(sourceName);
      throw ex;
    }
    String code = this.registry.getSource(sourceName);
    assert code != null;
    writer.append( code );
  }

  public static boolean isSourceRequest(String pathInfo) {
    assert pathInfo != null;
    
    int lastIndex = pathInfo.lastIndexOf(SOURCE_NAME_PREFIX);
    boolean isSource = lastIndex >= 0; 
    return isSource;
  }    

}