DojoResourceServlet.java

/*
 * 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.tuscany.sca.web.javascript.dojo;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URLDecoder;

import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.tuscany.sca.common.http.HTTPConstants;
import org.apache.tuscany.sca.common.http.HTTPContentTypeMapper;
import org.apache.tuscany.sca.common.http.HTTPUtil;


/**
 * A Resource servlet used to serve dojo files
 *
 * @version $Rev$ $Date$
 */
public class DojoResourceServlet extends HttpServlet {
    private static final long serialVersionUID = -4743631858548812340L;

    public DojoResourceServlet() {

    }

    @Override
    public void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException {
        String contextRoot = URLDecoder.decode(HTTPUtil.getContextRoot(request), HTTPConstants.CHARACTER_ENCODING_UTF8);
        String path = URLDecoder.decode(request.getRequestURI(), HTTPConstants.CHARACTER_ENCODING_UTF8);

        if( path.startsWith(contextRoot + "/dojo") ) {
            if( ! path.contains("tuscany/AtomService.js")) {
                //this is a workaround where we need to have dojo files in its own folder
                //to avoid clean target to clean other non dojo resources
                path = path.substring(contextRoot.length());
                path = "/dojo" + path;
            }
        } else if (path.startsWith(contextRoot)) {
            path = path.substring(contextRoot.length() + 1);
        } else if( path.startsWith("/")) {
            path = path.substring(1);
        }
        
        if(response.getContentType() == null || response.getContentType().length() == 0){
            // Calculate content-type based on extension
            String contentType = HTTPContentTypeMapper.getContentType(path);
            if(contentType != null && contentType.length() >0) {
                response.setContentType(contentType);
            }
        }
        
        response.setCharacterEncoding(HTTPConstants.CHARACTER_ENCODING_UTF8);
        
        // Write the response from the service implementation to the response
        // output stream
        InputStream is = this.getClass().getClassLoader().getResourceAsStream(path);
        if (is == null) {
            is = this.getClass().getResourceAsStream(path);
        }
        if(is != null) {
            OutputStream os = response.getOutputStream(); 
            byte[] buffer = new byte[2048];
            for (;;) {
                int n = is.read(buffer);
                if (n <= 0)
                    break;
                os.write(buffer, 0, n);
            }
            os.flush();
            os.close();            
        }
    }
}