TestResourceVariable.java revision 1053:111bbf1ad913 
1/*
2 * Copyright (c) 2010, 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
24/*
25 * @test
26 * @bug  6911256 6964740 6967842 6961571 7025809
27 * @summary Test that the resource variable kind is appropriately set
28 * @author  Joseph D. Darcy
29 * @library ../../../lib
30 * @build   JavacTestingAbstractProcessor TestResourceVariable
31 * @compile -processor TestResourceVariable -proc:only TestResourceVariable.java
32 */
33
34import java.io.*;
35import javax.annotation.processing.*;
36import javax.lang.model.*;
37import javax.lang.model.element.*;
38import javax.lang.model.type.*;
39import javax.lang.model.util.*;
40import java.util.*;
41import com.sun.source.tree.*;
42import com.sun.source.util.*;
43import static javax.tools.Diagnostic.Kind.*;
44
45/**
46 * Using the tree API, retrieve element representations of the
47 * resource of a try-with-resources statement and verify their kind
48 * tags are set appropriately.
49 */
50public class TestResourceVariable extends JavacTestingAbstractProcessor implements AutoCloseable {
51    int resourceVariableCount = 0;
52
53    public boolean process(Set<? extends TypeElement> annotations,
54                          RoundEnvironment roundEnv) {
55       if (!roundEnv.processingOver()) {
56           Trees trees = Trees.instance(processingEnv);
57
58           for(Element rootElement : roundEnv.getRootElements()) {
59               TreePath treePath = trees.getPath(rootElement);
60
61               (new ResourceVariableScanner(trees)).
62                   scan(trees.getTree(rootElement),
63                        treePath.getCompilationUnit());
64           }
65           if (resourceVariableCount != 3)
66               throw new RuntimeException("Bad resource variable count " +
67                                          resourceVariableCount);
68       }
69       return true;
70    }
71
72    @Override
73    public void close() {}
74
75    private void test1() {
76        try(TestResourceVariable trv = this) {}
77    }
78
79    private void test2() {
80        try(TestResourceVariable trv1 = this; TestResourceVariable trv2 = trv1) {}
81    }
82
83    /**
84     * Verify that a resource variable modeled as an element behaves
85     * as expected under 6 and latest specific visitors.
86     */
87    private static void testResourceVariable(Element element) {
88        ElementVisitor visitor6 = new ElementKindVisitor6<Void, Void>() {};
89
90        try {
91            visitor6.visit(element);
92            throw new RuntimeException("Expected UnknownElementException not thrown.");
93        } catch (UnknownElementException uee) {
94            ; // Expected.
95        }
96
97        ElementKindVisitor visitorLatest =
98            new ElementKindVisitor<Object, Void>() {
99            @Override
100            public Object visitVariableAsResourceVariable(VariableElement e,
101                                                          Void p) {
102                return e; // a non-null value
103            }
104        };
105
106        if (visitorLatest.visit(element) == null) {
107            throw new RuntimeException("Null result of resource variable visitation.");
108        }
109    }
110
111    class ResourceVariableScanner extends TreeScanner<Void, CompilationUnitTree> {
112       private Trees trees;
113
114       public ResourceVariableScanner(Trees trees) {
115           super();
116           this.trees = trees;
117       }
118       @Override
119       public Void visitVariable(VariableTree node, CompilationUnitTree cu) {
120           Element element = trees.getElement(trees.getPath(cu, node));
121
122           System.out.println("Name: " + element.getSimpleName() +
123                              "\tKind: " + element.getKind());
124           if (element.getKind() == ElementKind.RESOURCE_VARIABLE) {
125               testResourceVariable(element);
126               resourceVariableCount++;
127           }
128           return super.visitVariable(node, cu);
129       }
130    }
131}
132