1/*
2 * Copyright (c) 2006, 2015, 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/*
25 * @test
26 * @bug 6473148
27 * @summary TreePath.iterator() throws NPE
28 * @modules jdk.compiler
29 */
30import java.io.*;
31import java.util.Arrays;
32import java.util.Iterator;
33import java.util.Set;
34
35import javax.annotation.processing.*;
36import javax.lang.model.SourceVersion;
37import javax.lang.model.element.Element;
38import javax.lang.model.element.TypeElement;
39import javax.lang.model.util.ElementFilter;
40import javax.tools.JavaCompiler;
41import javax.tools.JavaFileObject;
42import javax.tools.StandardJavaFileManager;
43import javax.tools.ToolProvider;
44
45import com.sun.source.tree.Tree;
46import com.sun.source.util.*;
47
48@SupportedAnnotationTypes("*")
49public class TestTreePath extends AbstractProcessor {
50
51    @Override
52    public boolean process(Set<? extends TypeElement> annotations,
53            RoundEnvironment roundEnv) {
54        final Trees trees = Trees.instance(this.processingEnv);
55        for (Element element : ElementFilter.typesIn(roundEnv.getRootElements())) {
56            checkTreePath(trees, element, 2);
57            for (Element member : element.getEnclosedElements())
58                checkTreePath(trees, member, 3);
59        }
60        return true;
61    }
62
63    private void checkTreePath(Trees trees, Element element, int expectedLength) {
64        TreePath path = trees.getPath(element);
65        assert path != null;
66
67        int enhancedLength = 0;
68        for (Tree tree : path)
69            ++enhancedLength;
70
71        if (enhancedLength != expectedLength)
72            throw new RuntimeException("found path length is wrong");
73
74        int normalLoopLength = 0;
75        Iterator<Tree> iter = path.iterator();
76        while (iter.hasNext()) {
77          iter.next();
78          ++normalLoopLength;
79        }
80        if (normalLoopLength != expectedLength)
81            throw new RuntimeException("found path length is wrong");
82
83        TreePath curr = path;
84        // using getParent
85        int whileLoopLength = 0;
86        while (curr != null) {
87          ++whileLoopLength;
88          curr = curr.getParentPath();
89        }
90        if (whileLoopLength != expectedLength)
91            throw new RuntimeException("found path length is wrong");
92    }
93
94    @Override
95    public SourceVersion getSupportedSourceVersion() {
96        return SourceVersion.latest();
97    }
98
99    File writeTestFile() throws IOException {
100        File f = new File("Test.java");
101        PrintWriter out = new PrintWriter(new FileWriter(f));
102        out.println("class Test { void method() { } }");
103        out.close();
104        return f;
105    }
106
107    public void run() throws IOException {
108        JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();
109        try (StandardJavaFileManager fileManager
110                = compiler.getStandardFileManager(null, null, null)) {
111            Iterable<? extends JavaFileObject> tests
112                = fileManager.getJavaFileObjects(writeTestFile());
113
114            JavaCompiler.CompilationTask task =
115                ToolProvider.getSystemJavaCompiler().getTask(
116                        null, null, null,
117                        Arrays.asList("-processor", this.getClass().getName()), null,
118                        tests);
119            task.call();
120        }
121    }
122
123    public static void main(String[] args) throws IOException {
124        new TestTreePath().run();
125    }
126}
127