Processor.java revision 3155:30e288cb2d22 
1/*
2 * Copyright (c) 2013, 2015, 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 java.io.File;
25import java.io.IOException;
26import java.io.Writer;
27import java.net.URI;
28import java.net.URISyntaxException;
29import java.util.Arrays;
30import java.util.Comparator;
31import java.util.Map;
32import java.util.Map.Entry;
33import java.util.Set;
34import java.util.TreeMap;
35import javax.annotation.processing.AbstractProcessor;
36import javax.annotation.processing.RoundEnvironment;
37import javax.annotation.processing.SupportedAnnotationTypes;
38import javax.annotation.processing.SupportedOptions;
39import javax.lang.model.element.TypeElement;
40import javax.tools.Diagnostic;
41import javax.tools.DiagnosticCollector;
42import javax.tools.DiagnosticListener;
43import javax.tools.FileObject;
44import javax.tools.ForwardingJavaFileManager;
45import javax.tools.JavaFileManager;
46import javax.tools.JavaFileObject;
47import javax.tools.JavaFileObject.Kind;
48import javax.tools.SimpleJavaFileObject;
49import com.sun.source.tree.AnnotationTree;
50import com.sun.source.tree.CompilationUnitTree;
51import com.sun.source.tree.LiteralTree;
52import com.sun.source.util.JavacTask;
53import com.sun.source.util.TreeScanner;
54import com.sun.source.util.Trees;
55import com.sun.tools.javac.api.JavacTool;
56import com.sun.tools.javac.file.JavacFileManager;
57import com.sun.tools.javac.util.Assert;
58
59@SupportedAnnotationTypes("*")
60@SupportedOptions("target")
61public class Processor extends AbstractProcessor {
62
63    private int round = 0;
64    @Override
65    public boolean process(Set<? extends TypeElement> annotations, RoundEnvironment roundEnv) {
66        if (round++ == 0) {
67            try (Writer out = processingEnv.getFiler()
68                                                 .createSourceFile("Anno.java")
69                                                 .openWriter()) {
70                String target = processingEnv.getOptions().get("target");
71                String code = "import java.lang.annotation.ElementType;\n" +
72                              "import java.lang.annotation.Target;\n" +
73                              "@Target(ElementType." + target + ")\n" +
74                              "@interface Anno { public String value(); }\n";
75                out.write(code);
76            } catch (IOException exc) {
77                throw new IllegalStateException(exc);
78            }
79        }
80        return true;
81    }
82
83    public static void main(String... args) throws IOException, URISyntaxException {
84        if (args.length != 1) throw new IllegalStateException("Must provide class name!");
85        String testContent = null;
86        File testSrc = new File(System.getProperty("test.src"));
87        File testFile = new File(testSrc, args[0]);
88        if (!testFile.canRead()) throw new IllegalStateException("Cannot read the test source");
89        JavacTool compiler = JavacTool.create();
90        JavacFileManager fm = compiler.getStandardFileManager(null, null, null);
91        testContent = fm.getJavaFileObject(testFile.toPath()).getCharContent(true).toString();
92        JavaFileObject testFileObject = new TestFO(new URI("mem://" + args[0]), testContent);
93        TestFM testFileManager = new TestFM(fm);
94        JavacTask task = compiler.getTask(null,
95                                          testFileManager,
96                                          new DiagnosticCollector<JavaFileObject>(),
97                                          null,
98                                          null,
99                                          Arrays.asList(testFileObject));
100        final Trees trees = Trees.instance(task);
101        final CompilationUnitTree cut = task.parse().iterator().next();
102
103        final Map<int[], String> annotation2Target = new TreeMap<>(new Comparator<int[]>() {
104            @Override public int compare(int[] o1, int[] o2) {
105                return o2[0] - o1[0];
106            }
107        });
108
109        new TreeScanner<Void, Void>() {
110            @Override
111            public Void visitAnnotation(AnnotationTree node, Void p) {
112                int endPos = (int) trees.getSourcePositions().getEndPosition(cut, node);
113
114                Assert.check(endPos >= 0);
115
116                int startPos = (int) trees.getSourcePositions().getStartPosition(cut, node);
117                String target = ((LiteralTree) node.getArguments().get(0)).getValue().toString();
118
119                annotation2Target.put(new int[] {startPos, endPos}, target);
120
121                return super.visitAnnotation(node, p);
122            }
123        }.scan(cut.getTypeDecls().get(0), null);
124
125        DiagnosticListener<JavaFileObject> noErrors = new DiagnosticListener<JavaFileObject>() {
126            @Override public void report(Diagnostic<? extends JavaFileObject> diagnostic) {
127                if (diagnostic.getKind() == Diagnostic.Kind.ERROR) {
128                    throw new IllegalStateException(diagnostic.toString());
129                }
130            }
131        };
132
133        for (Entry<int[], String> e : annotation2Target.entrySet()) {
134            StringBuilder updatedContent = new StringBuilder();
135            int last = testContent.length();
136
137            for (int[] toRemove : annotation2Target.keySet()) {
138                if (toRemove == e.getKey()) continue;
139                updatedContent.insert(0, testContent.substring(toRemove[1], last));
140                last = toRemove[0];
141            }
142
143            updatedContent.insert(0, testContent.substring(0, last));
144
145            JavaFileObject updatedFile = new TestFO(new URI("mem://" + args[0]),
146                                                    updatedContent.toString());
147            JavacTask testTask = compiler.getTask(null,
148                                                  testFileManager,
149                                                  noErrors,
150                                                  Arrays.asList("-processor", "Processor",
151                                                                "-Atarget=" + e.getValue()),
152                                                  null,
153                                                  Arrays.asList(updatedFile));
154
155            try {
156                testTask.analyze();
157            } catch (Throwable exc) {
158                System.out.println("error while processing:");
159                System.out.println(updatedContent);
160                throw exc;
161            }
162
163            JavacTask testTask2 = compiler.getTask(null,
164                                                   testFileManager,
165                                                   new DiagnosticCollector<JavaFileObject>(),
166                                                   null,
167                                                   null,
168                                                   Arrays.asList(updatedFile));
169
170            try {
171                testTask2.analyze();
172            } catch (Throwable exc) {
173                System.out.println("error while processing:");
174                System.out.println(updatedContent);
175                throw exc;
176            }
177        }
178    }
179
180    private static final class TestFO extends SimpleJavaFileObject {
181        private final String content;
182        public TestFO(URI uri, String content) {
183            super(uri, Kind.SOURCE);
184            this.content = content;
185        }
186
187        @Override public CharSequence getCharContent(boolean ignoreEncodingErrors) throws IOException {
188            return content;
189        }
190
191        @Override public boolean isNameCompatible(String simpleName, Kind kind) {
192            return true;
193        }
194    }
195
196    private static final class TestFM extends ForwardingJavaFileManager<JavaFileManager> {
197
198        public TestFM(JavaFileManager fileManager) {
199            super(fileManager);
200        }
201
202        @Override
203        public boolean isSameFile(FileObject a, FileObject b) {
204            return a.equals(b);
205        }
206
207    }
208}
209