1/* 2 * Copyright (c) 2012, 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 24import com.sun.source.tree.CompilationUnitTree; 25import com.sun.source.tree.IdentifierTree; 26import com.sun.source.tree.MemberSelectTree; 27import com.sun.source.tree.Tree; 28import com.sun.source.util.JavacTask; 29import com.sun.source.util.Plugin; 30import com.sun.source.util.TaskEvent; 31import com.sun.source.util.TaskListener; 32import com.sun.source.util.TreePathScanner; 33import com.sun.source.util.Trees; 34import java.util.regex.Pattern; 35import javax.lang.model.type.TypeMirror; 36import javax.tools.Diagnostic.Kind; 37 38public class ShowTypePlugin implements Plugin { 39 40 public String getName() { 41 return "showtype"; 42 } 43 44 public void init(JavacTask task, String... args) { 45 Pattern pattern = null; 46 if (args.length == 1) 47 pattern = Pattern.compile(args[0]); 48 task.addTaskListener(new PostAnalyzeTaskListener(task, pattern)); 49 } 50 51 private static class PostAnalyzeTaskListener implements TaskListener { 52 private final ShowTypeTreeVisitor visitor; 53 54 PostAnalyzeTaskListener(JavacTask task, Pattern pattern) { 55 visitor = new ShowTypeTreeVisitor(task, pattern); 56 } 57 58 @Override 59 public void started(TaskEvent taskEvent) { } 60 61 @Override 62 public void finished(TaskEvent taskEvent) { 63 if (taskEvent.getKind().equals(TaskEvent.Kind.ANALYZE)) { 64 CompilationUnitTree compilationUnit = taskEvent.getCompilationUnit(); 65 visitor.scan(compilationUnit, null); 66 } 67 } 68 } 69 70 private static class ShowTypeTreeVisitor extends TreePathScanner<Void, Void> { 71 private final Trees trees; 72 private final Pattern pattern; 73 private CompilationUnitTree currCompUnit; 74 75 ShowTypeTreeVisitor(JavacTask task, Pattern pattern) { 76 trees = Trees.instance(task); 77 this.pattern = pattern; 78 } 79 80 @Override 81 public Void visitCompilationUnit(CompilationUnitTree tree, Void ignore) { 82 currCompUnit = tree; 83 return super.visitCompilationUnit(tree, ignore); 84 } 85 86 @Override 87 public Void visitIdentifier(IdentifierTree tree, Void ignore) { 88 show(tree, tree.getName()); 89 return super.visitIdentifier(tree, ignore); 90 } 91 92 @Override 93 public Void visitMemberSelect(MemberSelectTree tree, Void ignore) { 94 show(tree, tree.getIdentifier()); 95 return super.visitMemberSelect(tree, ignore); 96 } 97 98 void show(Tree tree, CharSequence name) { 99 if (pattern == null || pattern.matcher(name).matches()) { 100 TypeMirror type = trees.getTypeMirror(getCurrentPath()); 101 trees.printMessage(Kind.NOTE, "type is " + type, tree, currCompUnit); 102 } 103 } 104 } 105 106} 107