1 /*
2  * Copyright (c) 2013, 2016, 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 
24 package toolbox;
25 
26 import java.util.ArrayList;
27 import java.util.Arrays;
28 import java.util.HashMap;
29 import java.util.List;
30 import java.util.Map;
31 
32 /**
33  * A task to configure and run the disassembler tool, javap.
34  */
35 public class JavapTask extends AbstractTask<JavapTask> {
36     private String classpath;
37     private List<String> options;
38     private List<String> classes;
39 
40     /**
41      * Create a task to execute {@code javap} using {@code CMDLINE} mode.
42      * @param toolBox the {@code ToolBox} to use
43      */
JavapTask(ToolBox toolBox)44     public JavapTask(ToolBox toolBox) {
45         super(toolBox, Task.Mode.CMDLINE);
46     }
47 
48     /**
49      * Sets the classpath.
50      * @param classpath the classpath
51      * @return this task object
52      */
classpath(String classpath)53     public JavapTask classpath(String classpath) {
54         this.classpath = classpath;
55         return this;
56     }
57 
58     /**
59      * Sets the options.
60      * @param options the options
61      * @return this task object
62      */
options(String... options)63     public JavapTask options(String... options) {
64         this.options = Arrays.asList(options);
65         return this;
66     }
67 
68     /**
69      * Sets the classes to be analyzed.
70      * @param classes the classes
71      * @return this task object
72      */
classes(String... classes)73     public JavapTask classes(String... classes) {
74         this.classes = Arrays.asList(classes);
75         return this;
76     }
77 
78     /**
79      * {@inheritDoc}
80      * @return the name "javap"
81      */
82     @Override
name()83     public String name() {
84         return "javap";
85     }
86 
87     /**
88      * Calls the javap tool with the arguments as currently configured.
89      * @return a Result object indicating the outcome of the task
90      * and the content of any output written to stdout, stderr, or the
91      * main stream.
92      * @throws TaskError if the outcome of the task is not as expected.
93      */
94     @Override
run()95     public Task.Result run() {
96         List<String> args = new ArrayList<>();
97         if (options != null)
98             args.addAll(options);
99         if (classpath != null) {
100             args.add("-classpath");
101             args.add(classpath);
102         }
103         if (classes != null)
104             args.addAll(classes);
105 
106         AbstractTask.WriterOutput direct = new AbstractTask.WriterOutput();
107         // These are to catch output to System.out and System.err,
108         // in case these are used instead of the primary streams
109         AbstractTask.StreamOutput sysOut = new AbstractTask.StreamOutput(System.out, System::setOut);
110         AbstractTask.StreamOutput sysErr = new AbstractTask.StreamOutput(System.err, System::setErr);
111 
112         int rc;
113         Map<Task.OutputKind, String> outputMap = new HashMap<>();
114         try {
115             rc = com.sun.tools.javap.Main.run(args.toArray(new String[args.size()]), direct.pw);
116         } finally {
117             outputMap.put(Task.OutputKind.STDOUT, sysOut.close());
118             outputMap.put(Task.OutputKind.STDERR, sysErr.close());
119             outputMap.put(Task.OutputKind.DIRECT, direct.close());
120         }
121         return checkExit(new Task.Result(toolBox, this, rc, outputMap));
122     }
123 }
124