Mercurial > hg > truffle
view graal/com.oracle.max.graal.graphviz/src/com/oracle/max/graal/graphviz/GraphvizRunner.java @ 2874:d90bf514d647
Renamed packages.
author | Thomas Wuerthinger <thomas@wuerthinger.net> |
---|---|
date | Wed, 08 Jun 2011 08:59:54 +0200 |
parents | graal/com.oracle.max.graal.graphviz/src/com/oracle/graal/graph/vis/GraphvizRunner.java@0341b6424579 |
children |
line wrap: on
line source
/* * Copyright (c) 2011, 2011, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code 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 General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ package com.oracle.max.graal.graphviz; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; /** * Provides functionality to process graphs in the DOT language with a Graphviz tool and obtain the generated output. */ public class GraphvizRunner { public static final String DOT_LAYOUT = "dot"; /** * Processes data from an input stream with a Graphviz tool such as {@code dot}, writing output in the specified * format to the given output stream. The method waits for the executed tool to finish and then returns its exit * code. * * @param layout * The Graphviz layouter to use (e.g. "dot"). * @param in * Stream to read input from. * @param out * Stream to write output to. * @param format * Desired output format (-T parameter). * @return Exit code of the called utility. * @throws IOException * When the process can not be started (e.g. Graphviz missing) or reading/writing a stream fails. */ public static int process(String layout, InputStream in, OutputStream out, String format) throws IOException { byte[] buffer = new byte[4096]; // create and start process ProcessBuilder pb = new ProcessBuilder("dot", "-T", format, "-K", layout); Process p = pb.start(); // write data from in to stdin OutputStream stdin = p.getOutputStream(); transfer(buffer, in, stdin); stdin.close(); in.close(); // read output from stdout and write to out InputStream stdout = p.getInputStream(); transfer(buffer, stdout, out); stdout.close(); // wait for process to terminate for (;;) { try { return p.waitFor(); } catch (InterruptedException e) { // ignore } } } /** * Reads all data from an {@link InputStream} and writes it to an {@link OutputStream}, using the provided buffer. */ private static void transfer(byte[] buffer, InputStream in, OutputStream out) throws IOException { int count; while ((count = in.read(buffer, 0, buffer.length)) != -1) { out.write(buffer, 0, count); } in.close(); } }