Java tutorial
/* * Copyright (c) 2012, the Dart project authors. * * Licensed under the Eclipse Public License v1.0 (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.eclipse.org/legal/epl-v10.html * * 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.dart.tools.designer.model; import com.google.dart.tools.designer.DartDesignerPlugin; import org.apache.commons.lang.StringUtils; import org.eclipse.core.runtime.FileLocator; import org.eclipse.swt.graphics.Image; import org.eclipse.wb.internal.core.utils.IOUtils2; import org.osgi.framework.Bundle; import java.io.BufferedReader; import java.io.ByteArrayInputStream; import java.io.EOFException; import java.io.File; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.io.OutputStream; import java.io.Reader; import java.net.URL; public class HtmlRenderHelper { private static Process process; private static OutputStream processOutputStream; private static InputStream processInputStream; private static BufferedReader processReader; /** * @return the image of given HTML content, may be <code>null</code>. */ public static Image renderImage(final String content) { try { File tempFile = File.createTempFile("htmlRender", ".html"); try { IOUtils2.writeBytes(tempFile, content.getBytes()); // start DumpRenderTree if (processOutputStream == null) { String path; { Bundle bundle = DartDesignerPlugin.getDefault().getBundle(); URL url = bundle.getEntry("lib/DumpRenderTree.app/Contents/MacOS/DumpRenderTree"); path = FileLocator.toFileURL(url).getPath(); } // ProcessBuilder builder = new ProcessBuilder(path, "-p", tempFile.getAbsolutePath()); ProcessBuilder builder = new ProcessBuilder(path, "-p", "-"); builder.redirectErrorStream(true); Process process = builder.start(); processOutputStream = process.getOutputStream(); processInputStream = process.getInputStream(); processReader = new BufferedReader(new InputStreamReader(processInputStream)); } long start = System.nanoTime(); // XXX // processOutputStream.write((tempFile.getAbsolutePath() + "\n").getBytes()); processOutputStream .write(("http://127.0.0.1:3030/Users/scheglov/dart/dwc_first/web/out/dwc_first.html\n") .getBytes()); processOutputStream.flush(); // read tree while (true) { String line = processReader.readLine(); System.out.println(line); if (line.isEmpty()) { break; } } // read image { processReader.readLine(); // ActualHash: processReader.readLine(); // Content-Type: image/png String lengthLine = processReader.readLine(); // Content-Length: 5546 int pngLength = Integer.parseInt(StringUtils.removeStart(lengthLine, "Content-Length: ")); // System.out.println("pngLength: " + pngLength); char[] pngChars = new char[pngLength]; readFully(processReader, pngChars); byte[] pngBytes = new String(pngChars).getBytes(); Image image = new Image(null, new ByteArrayInputStream(pngBytes)); System.out.println("imageTime: " + (System.nanoTime() - start) / 1000000.0); return image; } // // { // SessionInputBuffer buffer = new AbstractSessionInputBuffer() { // { // init(processInputStream, 1024, new BasicHttpParams()); // } // // @Override // public boolean isDataAvailable(int timeout) throws IOException { // return false; // } // }; // LineParser lineParser = new BasicLineParser(new ProtocolVersion("HTTP", 1, 1)); // HttpMessageParser<HttpResponse> parser = new DefaultHttpResponseParser( // buffer, // lineParser, // new DefaultHttpResponseFactory(), // new BasicHttpParams()); // HttpResponse response = parser.parse(); // System.out.println(response); // HttpParams params = new BasicHttpParams(); // SessionInputBuffer inbuffer = new SessionInputBufferMockup(s, "US-ASCII", params); // HttpMessageParser<BasicHttpResponse> parser = new DefaultResponseParser( // inbuffer, // BasicLineParser.DEFAULT, // new DefaultHttpResponseFactory(), // params); // // HttpResponse response = parser.parse(); // } // while (true) { // String line = processReader.readLine(); // System.out.println(line); // } // // byte[] bytes = IOUtils2.readBytes(processInputStream); // int exitValue = process.exitValue(); // System.out.println("bytes: " + bytes.length); // System.out.println("bytesTime: " + (System.nanoTime() - start) / 1000000.0); // String output = new String(bytes); // System.out.println(StringUtils.substring(output, -10, 0)); //// System.out.println(output); // // // int pngOffset = output.indexOf("Content-Type: image/png"); // pngOffset = output.indexOf('\n', pngOffset) + 1; // pngOffset = output.indexOf('\n', pngOffset) + 1; // Image image = new Image(null, new ByteArrayInputStream(bytes, pngOffset, bytes.length // - pngOffset)); // System.out.println("imageTime: " + (System.nanoTime() - start) / 1000000.0); // return image; } finally { tempFile.delete(); } } catch (Throwable e) { e.printStackTrace(); } return null; } /** * Read the requested number of characters or fail if there are not enough left. * <p> * TODO(scheglov) update to modern Commons-IO which has this method. */ private static void readFully(Reader input, char[] buffer) throws IOException { int length = buffer.length; int remaining = length; while (remaining > 0) { int location = length - remaining; int count = input.read(buffer, location, remaining); if (count == -1) { throw new EOFException("Length to read: " + length + " actual: " + (length - remaining)); } remaining -= count; } } }