dev/codeserver/java/com/google/gwt/dev/codeserver/Pages.java - gwt - Git at Google

 /*
  * Copyright 2014 Google Inc.
  *
  * Licensed 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.google.gwt.dev.codeserver;

 import com.google.gwt.core.ext.TreeLogger;
 import com.google.gwt.core.ext.TreeLogger.Type;
 import com.google.gwt.dev.json.JsonObject;
 import com.google.gwt.thirdparty.guava.common.io.Resources;

 import java.io.IOException;
 import java.io.OutputStreamWriter;
 import java.io.Writer;
 import java.net.URL;

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

 /**
  * Common HTTP responses that send HTML pages. For non-HTML pages, see {@link Responses}.
  */
 class Pages {

   /**
    * Returns an HTML page with some JSON code prepended to it.
    * (If the resource file isn't found, returns an ErrorPage instead.)
    *
    * @param variableName  the name of the variable to set on the "window" object.
    * @param json  the data to embed in the script.
    * @param resourceName  the name of the HTML file to send (in the current directory)
    */
   static Response newHtmlPage(final String variableName, final JsonObject json,
       final String resourceName) {

     final URL resource = WebServer.class.getResource(resourceName);
     if (resource == null) {
       return new ErrorPage("resource not found: " + resourceName);
     } else {
       return new HtmlPage(variableName, json, resource);
     }
   }

   /**
    * A response that will send a static HTML page with JSON data prepended.
    */
   static class HtmlPage implements Response {
     final String variableName;
     final JsonObject json;
     final URL resource;

     /**
      * @see {@link #newHtmlPage}.
      */
     private HtmlPage(String variableName, JsonObject json, URL resource) {
       this.variableName = variableName;
       this.json = json;
       this.resource = resource;
     }

     @Override
     public void send(HttpServletRequest request, HttpServletResponse response, TreeLogger logger)
         throws IOException {
       response.setStatus(HttpServletResponse.SC_OK);
       response.setContentType("text/html");

       ServletOutputStream outBytes = response.getOutputStream();
       Writer out = new OutputStreamWriter(outBytes, "UTF-8");

       out.append("<!DOCTYPE html>\n");
       out.append("<script>\n");
       out.append("window." + variableName + " = ");
       json.write(out);
       out.append(";\n");
       out.append("</script>\n");
       out.flush();

       Resources.copy(resource, outBytes);
     }
   }

   /**
    * A response that will send an error page.
    */
   static class ErrorPage implements Response {
     final int status;
     final String message;

     ErrorPage(String message) {
       this(HttpServletResponse.SC_NOT_FOUND, message);
     }

     ErrorPage(int httpStatus, String message) {
       this.status = httpStatus;
       this.message = message;
     }

     @Override
     public void send(HttpServletRequest request, HttpServletResponse response, TreeLogger logger)
         throws IOException {

       response.setStatus(status);
       response.setContentType("text/html");
       HtmlWriter out = new HtmlWriter(response.getWriter());
       out.startTag("html").nl();

       out.startTag("head").nl();
       out.startTag("title").text("Unavailable (GWT Code Server)").endTag("title").nl();
       out.endTag("head").nl();

       out.startTag("body").nl();
       out.startTag("p").text(message).endTag("p");
       out.endTag("body").nl();

       out.endTag("html").nl();

       logger.log(Type.INFO, "Sent error page: " + message);
     }
   }
 }
	/*
	* Copyright 2014 Google Inc.
	*
	* Licensed 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.google.gwt.dev.codeserver;

	import com.google.gwt.core.ext.TreeLogger;
	import com.google.gwt.core.ext.TreeLogger.Type;
	import com.google.gwt.dev.json.JsonObject;
	import com.google.gwt.thirdparty.guava.common.io.Resources;

	import java.io.IOException;
	import java.io.OutputStreamWriter;
	import java.io.Writer;
	import java.net.URL;

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

	/**
	* Common HTTP responses that send HTML pages. For non-HTML pages, see {@link Responses}.
	*/
	class Pages {

	/**
	* Returns an HTML page with some JSON code prepended to it.
	* (If the resource file isn't found, returns an ErrorPage instead.)
	*
	* @param variableName the name of the variable to set on the "window" object.
	* @param json the data to embed in the script.
	* @param resourceName the name of the HTML file to send (in the current directory)
	*/
	static Response newHtmlPage(final String variableName, final JsonObject json,
	final String resourceName) {

	final URL resource = WebServer.class.getResource(resourceName);
	if (resource == null) {
	return new ErrorPage("resource not found: " + resourceName);
	} else {
	return new HtmlPage(variableName, json, resource);
	}
	}

	/**
	* A response that will send a static HTML page with JSON data prepended.
	*/
	static class HtmlPage implements Response {
	final String variableName;
	final JsonObject json;
	final URL resource;

	/**
	* @see {@link #newHtmlPage}.
	*/
	private HtmlPage(String variableName, JsonObject json, URL resource) {
	this.variableName = variableName;
	this.json = json;
	this.resource = resource;
	}

	@Override
	public void send(HttpServletRequest request, HttpServletResponse response, TreeLogger logger)
	throws IOException {
	response.setStatus(HttpServletResponse.SC_OK);
	response.setContentType("text/html");

	ServletOutputStream outBytes = response.getOutputStream();
	Writer out = new OutputStreamWriter(outBytes, "UTF-8");

	out.append("<!DOCTYPE html>\n");
	out.append("<script>\n");
	out.append("window." + variableName + " = ");
	json.write(out);
	out.append(";\n");
	out.append("</script>\n");
	out.flush();

	Resources.copy(resource, outBytes);
	}
	}

	/**
	* A response that will send an error page.
	*/
	static class ErrorPage implements Response {
	final int status;
	final String message;

	ErrorPage(String message) {
	this(HttpServletResponse.SC_NOT_FOUND, message);
	}

	ErrorPage(int httpStatus, String message) {
	this.status = httpStatus;
	this.message = message;
	}

	@Override
	public void send(HttpServletRequest request, HttpServletResponse response, TreeLogger logger)
	throws IOException {

	response.setStatus(status);
	response.setContentType("text/html");
	HtmlWriter out = new HtmlWriter(response.getWriter());
	out.startTag("html").nl();

	out.startTag("head").nl();
	out.startTag("title").text("Unavailable (GWT Code Server)").endTag("title").nl();
	out.endTag("head").nl();

	out.startTag("body").nl();
	out.startTag("p").text(message).endTag("p");
	out.endTag("body").nl();

	out.endTag("html").nl();

	logger.log(Type.INFO, "Sent error page: " + message);
	}
	}
	}