Thu, 31 Aug 2017 15:17:03 +0800
merge
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 */
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 /tools/javac/lib
30 * @build JavacTestingAbstractProcessor TestResourceVariable
31 * @compile -processor TestResourceVariable -proc:only TestResourceVariable.java
32 */
34 import java.io.*;
35 import javax.annotation.processing.*;
36 import javax.lang.model.*;
37 import javax.lang.model.element.*;
38 import javax.lang.model.type.*;
39 import javax.lang.model.util.*;
40 import java.util.*;
41 import com.sun.source.tree.*;
42 import com.sun.source.util.*;
43 import static javax.tools.Diagnostic.Kind.*;
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 */
50 public class TestResourceVariable extends JavacTestingAbstractProcessor implements AutoCloseable {
51 int resourceVariableCount = 0;
53 public boolean process(Set<? extends TypeElement> annotations,
54 RoundEnvironment roundEnv) {
55 if (!roundEnv.processingOver()) {
56 Trees trees = Trees.instance(processingEnv);
58 for(Element rootElement : roundEnv.getRootElements()) {
59 TreePath treePath = trees.getPath(rootElement);
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 }
72 @Override
73 public void close() {}
75 private void test1() {
76 try(TestResourceVariable trv = this) {}
77 }
79 private void test2() {
80 try(TestResourceVariable trv1 = this; TestResourceVariable trv2 = trv1) {}
81 }
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>() {};
90 try {
91 visitor6.visit(element);
92 throw new RuntimeException("Expected UnknownElementException not thrown.");
93 } catch (UnknownElementException uee) {
94 ; // Expected.
95 }
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 };
106 if (visitorLatest.visit(element) == null) {
107 throw new RuntimeException("Null result of resource variable visitation.");
108 }
109 }
111 class ResourceVariableScanner extends TreeScanner<Void, CompilationUnitTree> {
112 private Trees trees;
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));
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 }