org.eclipse.rwt.widgets.codemirror.internal.CodeMirrorJSService.java Source code

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Here is the source code for org.eclipse.rwt.widgets.codemirror.internal.CodeMirrorJSService.java

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/*
 * polymap.org
 * Copyright 2011, Falko Brutigam, and other contributors as indicated by
 * the @authors tag.
 * 
 * This 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 2.1 of the License, or (at your option)
 * any later version.
 * 
 * This software 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.
 */
package org.eclipse.rwt.widgets.codemirror.internal;

import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.net.URL;

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

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

import org.eclipse.rwt.RWT;
import org.eclipse.rwt.internal.util.URLHelper;
import org.eclipse.rwt.service.IServiceHandler;
import org.eclipse.rwt.widgets.codemirror.CodeMirrorPlugin;

/**
 * Provides JavaScript and CSS files from the codemirror.zip. 
 *
 * @author <a href="http://www.polymap.de">Falko Brutigam</a>
 */
@SuppressWarnings("restriction")
public class CodeMirrorJSService implements IServiceHandler {

    private static Log log = LogFactory.getLog(CodeMirrorJSService.class);

    private static final String SERVICE_HANDLER_ID = CodeMirrorJSService.class.getSimpleName();

    private static final String RESOURCE_BASE = "codemirror";

    private static final String FILENAME_PARAM = "res";

    /**
     * Registers this service handler. This method should be called only once.
     */
    public static void register() {
        CodeMirrorJSService instance = new CodeMirrorJSService();
        RWT.getServiceManager().registerServiceHandler(SERVICE_HANDLER_ID, instance);
    }

    /**
     * Builds a url which points to the service handler and encodes the given parameters
     * as url parameters. 
     */
    public static String getBaseUrl() {
        StringBuffer url = new StringBuffer();
        url.append(URLHelper.getURLString(false));

        URLHelper.appendFirstParam(url, REQUEST_PARAM, SERVICE_HANDLER_ID);

        // convert to relative URL
        int firstSlash = url.indexOf("/", url.indexOf("//") + 2); // first slash after double slash of "http://"
        url.delete(0, firstSlash + 1); // Result is sth like "/rap?custom_service_handler..."
        return RWT.getResponse().encodeURL(url.toString());
    }

    // instance *******************************************

    public void service() throws IOException, ServletException {
        // request
        final HttpServletRequest request = RWT.getRequest();
        log.debug("Request: " + request.getPathInfo());
        String filename = request.getParameter(FILENAME_PARAM);

        // response
        final HttpServletResponse response = RWT.getResponse();
        final PrintWriter out = response.getWriter();

        if (filename.endsWith(".js")) {
            response.setContentType("text/javascript");
        } else if (filename.endsWith(".css")) {
            response.setContentType("text/css");
        }
        response.setHeader("Cache-Control", "no-cache");
        response.setBufferSize(4096);

        // copy resource to response out
        URL res = CodeMirrorPlugin.getDefault().getBundle().getResource(RESOURCE_BASE + "/" + filename);
        InputStream in = null;
        try {
            in = new BufferedInputStream(res.openStream());
            for (int c = in.read(); c != -1; c = in.read()) {
                out.write(c);
            }
        } finally {
            if (in != null) {
                in.close();
            }
        }
    }

}