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comparison graal/com.oracle.max.graal.graphviz/src/com/oracle/max/graal/graphviz/GraphvizRunner.java @ 2874:d90bf514d647

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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
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2873:810e2d253e00 2874:d90bf514d647
1 /*
2 * Copyright (c) 2011, 2011, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23 package com.oracle.max.graal.graphviz;
24
25 import java.io.IOException;
26 import java.io.InputStream;
27 import java.io.OutputStream;
28
29 /**
30 * Provides functionality to process graphs in the DOT language with a Graphviz tool and obtain the generated output.
31 */
32 public class GraphvizRunner {
33
34 public static final String DOT_LAYOUT = "dot";
35
36 /**
37 * Processes data from an input stream with a Graphviz tool such as {@code dot}, writing output in the specified
38 * format to the given output stream. The method waits for the executed tool to finish and then returns its exit
39 * code.
40 *
41 * @param layout
42 * The Graphviz layouter to use (e.g. "dot").
43 * @param in
44 * Stream to read input from.
45 * @param out
46 * Stream to write output to.
47 * @param format
48 * Desired output format (-T parameter).
49 * @return Exit code of the called utility.
50 * @throws IOException
51 * When the process can not be started (e.g. Graphviz missing) or reading/writing a stream fails.
52 */
53 public static int process(String layout, InputStream in, OutputStream out, String format) throws IOException {
54 byte[] buffer = new byte[4096];
55
56 // create and start process
57 ProcessBuilder pb = new ProcessBuilder("dot", "-T", format, "-K", layout);
58 Process p = pb.start();
59
60 // write data from in to stdin
61 OutputStream stdin = p.getOutputStream();
62 transfer(buffer, in, stdin);
63 stdin.close();
64 in.close();
65
66 // read output from stdout and write to out
67 InputStream stdout = p.getInputStream();
68 transfer(buffer, stdout, out);
69 stdout.close();
70
71 // wait for process to terminate
72 for (;;) {
73 try {
74 return p.waitFor();
75 } catch (InterruptedException e) {
76 // ignore
77 }
78 }
79 }
80
81 /**
82 * Reads all data from an {@link InputStream} and writes it to an {@link OutputStream}, using the provided buffer.
83 */
84 private static void transfer(byte[] buffer, InputStream in, OutputStream out) throws IOException {
85 int count;
86 while ((count = in.read(buffer, 0, buffer.length)) != -1) {
87 out.write(buffer, 0, count);
88 }
89 in.close();
90 }
91 }