Processor.java revision 2674:e284f560acf6 
1/*
2 * Copyright (c) 2013, 2014, 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.AnnotationTree;
25import com.sun.source.tree.CompilationUnitTree;
26import com.sun.source.util.JavacTask;
27import com.sun.source.util.TreeScanner;
28import com.sun.source.util.Trees;
29import com.sun.tools.javac.api.JavacTool;
30import com.sun.tools.javac.file.JavacFileManager;
31import com.sun.tools.javac.util.Assert;
32import java.io.File;
33import java.io.IOException;
34import java.net.URI;
35import java.net.URISyntaxException;
36import java.util.ArrayList;
37import java.util.Arrays;
38import java.util.Collections;
39import java.util.Comparator;
40import java.util.List;
41import java.util.Set;
42import javax.annotation.processing.AbstractProcessor;
43import javax.annotation.processing.RoundEnvironment;
44import javax.annotation.processing.SupportedAnnotationTypes;
45import javax.lang.model.element.TypeElement;
46import javax.tools.Diagnostic;
47import javax.tools.DiagnosticListener;
48import javax.tools.FileObject;
49import javax.tools.ForwardingJavaFileManager;
50import javax.tools.JavaFileManager;
51import javax.tools.JavaFileObject;
52import javax.tools.SimpleJavaFileObject;
53
54@SupportedAnnotationTypes("*")
55public class Processor extends AbstractProcessor {
56
57    @Override
58    public boolean process(Set<? extends TypeElement> annotations, RoundEnvironment roundEnv) {
59        throw new IllegalStateException("Should not be invoked.");
60    }
61
62    public static void main(String... args) throws IOException, URISyntaxException {
63        if (args.length != 1) throw new IllegalStateException("Must provide class name!");
64        String testContent = null;
65        List<File> sourcePath = new ArrayList<>();
66        for (String sourcePaths : System.getProperty("test.src.path").split(":")) {
67            sourcePath.add(new File(sourcePaths));
68        }
69        JavacFileManager fm = JavacTool.create().getStandardFileManager(null, null, null);
70        for (File sp : sourcePath) {
71            File inp = new File(sp, args[0]);
72
73            if (inp.canRead()) {
74                testContent = fm.getRegularFile(inp.toPath()).getCharContent(true).toString();
75            }
76        }
77        if (testContent == null) throw new IllegalStateException();
78        DiagnosticListener<JavaFileObject> devNull = new DiagnosticListener<JavaFileObject>() {
79            @Override public void report(Diagnostic<? extends JavaFileObject> diagnostic) { }
80        };
81        JavaFileObject testFile = new TestFO(new URI("mem://" + args[0]), testContent);
82        JavacTask task = JavacTool.create().getTask(null,
83                                                    new TestFM(fm),
84                                                    devNull,
85                                                    Arrays.asList("-Xjcov"),
86                                                    null,
87                                                    Arrays.asList(testFile));
88        final Trees trees = Trees.instance(task);
89        final CompilationUnitTree cut = task.parse().iterator().next();
90        task.analyze();
91
92        final List<int[]> annotations = new ArrayList<>();
93
94        new TreeScanner<Void, Void>() {
95            @Override
96            public Void visitAnnotation(AnnotationTree node, Void p) {
97                int endPos = (int) trees.getSourcePositions().getEndPosition(cut, node);
98
99                Assert.check(endPos >= 0);
100
101                annotations.add(new int[] {(int) trees.getSourcePositions().getStartPosition(cut, node), endPos});
102                return super.visitAnnotation(node, p);
103            }
104        }.scan(cut.getTypeDecls().get(0), null);
105
106        Collections.sort(annotations, new Comparator<int[]>() {
107            @Override public int compare(int[] o1, int[] o2) {
108                return o2[0] - o1[0];
109            }
110        });
111
112        for (final int[] annotation : annotations) {
113            StringBuilder updatedContent = new StringBuilder();
114            int last = testContent.length();
115
116            for (int[] toRemove : annotations) {
117                if (toRemove == annotation) continue;
118                updatedContent.insert(0, testContent.substring(toRemove[1], last));
119                last = toRemove[0];
120            }
121
122            updatedContent.insert(0, testContent.substring(0, last));
123
124            JavaFileObject updatedFile = new TestFO(new URI("mem://" + args[0]), updatedContent.toString());
125            JavacTask testTask = JavacTool.create().getTask(null,
126                                                            new TestFM(fm),
127                                                            devNull,
128                                                            Arrays.asList("-processor", "Processor"),
129                                                            null,
130                                                            Arrays.asList(updatedFile));
131
132            try {
133                testTask.analyze();
134            } catch (Throwable e) {
135                System.out.println("error while processing:");
136                System.out.println(updatedContent);
137                throw e;
138            }
139        }
140    }
141
142    private static final class TestFO extends SimpleJavaFileObject {
143        private final String content;
144        public TestFO(URI uri, String content) {
145            super(uri, Kind.SOURCE);
146            this.content = content;
147        }
148
149        @Override public CharSequence getCharContent(boolean ignoreEncodingErrors) throws IOException {
150            return content;
151        }
152
153        @Override public boolean isNameCompatible(String simpleName, Kind kind) {
154            return true;
155        }
156    }
157
158    private static final class TestFM extends ForwardingJavaFileManager<JavaFileManager> {
159
160        public TestFM(JavaFileManager fileManager) {
161            super(fileManager);
162        }
163
164        @Override
165        public boolean isSameFile(FileObject a, FileObject b) {
166            return a.equals(b);
167        }
168
169    }
170}
171