1 /* 2 * Copyright (c) 2018, 2019, 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 8231827 27 * @summary Ensure SimpleTreeVisitor.visitBindingPattern and visitInstanceOf behaves as it should 28 * @modules jdk.compiler 29 */ 30 31 import java.io.IOException; 32 import java.io.StringWriter; 33 import java.net.URI; 34 import java.util.Arrays; 35 import java.util.List; 36 37 import javax.tools.*; 38 39 import com.sun.source.tree.BindingPatternTree; 40 import com.sun.source.tree.CompilationUnitTree; 41 import com.sun.source.tree.InstanceOfTree; 42 import com.sun.source.tree.Tree; 43 import com.sun.source.util.JavacTask; 44 import com.sun.source.util.SimpleTreeVisitor; 45 import com.sun.source.util.TreePathScanner; 46 47 public class PatternsSimpleVisitorTest { 48 main(String[] args)49 public static void main(String[] args) throws Exception { 50 new PatternsSimpleVisitorTest().run(); 51 } 52 run()53 void run() throws Exception { 54 String code = "class Test {\n" + 55 " boolean t(Object o) {\n" + 56 " return o instanceof String s ? s.isEmpty() : false;\n" + 57 " }\n" + 58 "}\n"; 59 int[] callCount = new int[1]; 60 int[] instanceOfNodeCount = new int[1]; 61 int[] bindingPatternNodeCount = new int[1]; 62 new TreePathScanner<Void, Void>() { 63 @Override 64 public Void visitInstanceOf(InstanceOfTree node, Void p) { 65 node.accept(new SimpleTreeVisitor<Void, Void>() { 66 @Override 67 protected Void defaultAction(Tree defaultActionNode, Void p) { 68 callCount[0]++; 69 if (node == defaultActionNode) { 70 instanceOfNodeCount[0]++; 71 } 72 return null; 73 } 74 }, null); 75 return super.visitInstanceOf(node, p); 76 } 77 @Override 78 public Void visitBindingPattern(BindingPatternTree node, Void p) { 79 node.accept(new SimpleTreeVisitor<Void, Void>() { 80 @Override 81 protected Void defaultAction(Tree defaultActionNode, Void p) { 82 callCount[0]++; 83 if (node == defaultActionNode) { 84 bindingPatternNodeCount[0]++; 85 } 86 return null; 87 } 88 }, null); 89 return super.visitBindingPattern(node, p); 90 } 91 }.scan(parse(code), null); 92 93 if (callCount[0] != 2 || instanceOfNodeCount[0] != 1 || 94 bindingPatternNodeCount[0] != 1) { 95 throw new AssertionError("Unexpected counts; callCount=" + callCount[0] + 96 ", switchExprNodeCount=" + instanceOfNodeCount[0] + 97 ", yieldNodeCount=" + bindingPatternNodeCount[0]); 98 } 99 } 100 parse(String code)101 private CompilationUnitTree parse(String code) throws IOException { 102 final JavaCompiler tool = ToolProvider.getSystemJavaCompiler(); 103 assert tool != null; 104 DiagnosticListener<JavaFileObject> noErrors = d -> {}; 105 106 StringWriter out = new StringWriter(); 107 JavacTask ct = (JavacTask) tool.getTask(out, null, noErrors, 108 null, null, 109 Arrays.asList(new MyFileObject(code))); 110 return ct.parse().iterator().next(); 111 } 112 113 static class MyFileObject extends SimpleJavaFileObject { 114 private String text; 115 MyFileObject(String text)116 public MyFileObject(String text) { 117 super(URI.create("myfo:/Test.java"), JavaFileObject.Kind.SOURCE); 118 this.text = text; 119 } 120 121 @Override getCharContent(boolean ignoreEncodingErrors)122 public CharSequence getCharContent(boolean ignoreEncodingErrors) { 123 return text; 124 } 125 } 126 } 127