/*
* Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
import java.io.File;
import java.io.IOException;
import java.io.Writer;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.Arrays;
import java.util.Comparator;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;
import java.util.TreeMap;
import javax.annotation.processing.AbstractProcessor;
import javax.annotation.processing.RoundEnvironment;
import javax.annotation.processing.SupportedAnnotationTypes;
import javax.annotation.processing.SupportedOptions;
import javax.lang.model.element.TypeElement;
import javax.tools.Diagnostic;
import javax.tools.DiagnosticCollector;
import javax.tools.DiagnosticListener;
import javax.tools.FileObject;
import javax.tools.ForwardingJavaFileManager;
import javax.tools.JavaFileManager;
import javax.tools.JavaFileObject;
import javax.tools.JavaFileObject.Kind;
import javax.tools.SimpleJavaFileObject;
import com.sun.source.tree.AnnotationTree;
import com.sun.source.tree.CompilationUnitTree;
import com.sun.source.tree.LiteralTree;
import com.sun.source.util.JavacTask;
import com.sun.source.util.TreeScanner;
import com.sun.source.util.Trees;
import com.sun.tools.javac.api.JavacTool;
import com.sun.tools.javac.file.JavacFileManager;
import com.sun.tools.javac.util.Assert;
@SupportedAnnotationTypes("*")
@SupportedOptions("target")
public class Processor extends AbstractProcessor {
private int round = 0;
@Override
public boolean process(Set<? extends TypeElement> annotations, RoundEnvironment roundEnv) {
if (round++ == 0) {
try (Writer out = processingEnv.getFiler()
.createSourceFile("Anno.java")
.openWriter()) {
String target = processingEnv.getOptions().get("target");
String code = "import java.lang.annotation.ElementType;\n" +
"import java.lang.annotation.Target;\n" +
"@Target(ElementType." + target + ")\n" +
"@interface Anno { public String value(); }\n";
out.write(code);
} catch (IOException exc) {
throw new IllegalStateException(exc);
}
}
return true;
}
public static void main(String... args) throws IOException, URISyntaxException {
if (args.length != 1) throw new IllegalStateException("Must provide class name!");
String testContent = null;
File testSrc = new File(System.getProperty("test.src"));
File testFile = new File(testSrc, args[0]);
if (!testFile.canRead()) throw new IllegalStateException("Cannot read the test source");
JavacTool compiler = JavacTool.create();
JavacFileManager fm = compiler.getStandardFileManager(null, null, null);
testContent = fm.getRegularFile(testFile).getCharContent(true).toString();
JavaFileObject testFileObject = new TestFO(new URI("mem://" + args[0]), testContent);
TestFM testFileManager = new TestFM(fm);
JavacTask task = compiler.getTask(null,
testFileManager,
new DiagnosticCollector<JavaFileObject>(),
null,
null,
Arrays.asList(testFileObject));
final Trees trees = Trees.instance(task);
final CompilationUnitTree cut = task.parse().iterator().next();
final Map<int[], String> annotation2Target = new TreeMap<>(new Comparator<int[]>() {
@Override public int compare(int[] o1, int[] o2) {
return o2[0] - o1[0];
}
});
new TreeScanner<Void, Void>() {
@Override
public Void visitAnnotation(AnnotationTree node, Void p) {
int endPos = (int) trees.getSourcePositions().getEndPosition(cut, node);
Assert.check(endPos >= 0);
int startPos = (int) trees.getSourcePositions().getStartPosition(cut, node);
String target = ((LiteralTree) node.getArguments().get(0)).getValue().toString();
annotation2Target.put(new int[] {startPos, endPos}, target);
return super.visitAnnotation(node, p);
}
}.scan(cut.getTypeDecls().get(0), null);
DiagnosticListener<JavaFileObject> noErrors = new DiagnosticListener<JavaFileObject>() {
@Override public void report(Diagnostic<? extends JavaFileObject> diagnostic) {
if (diagnostic.getKind() == Diagnostic.Kind.ERROR) {
throw new IllegalStateException(diagnostic.toString());
}
}
};
for (Entry<int[], String> e : annotation2Target.entrySet()) {
StringBuilder updatedContent = new StringBuilder();
int last = testContent.length();
for (int[] toRemove : annotation2Target.keySet()) {
if (toRemove == e.getKey()) continue;
updatedContent.insert(0, testContent.substring(toRemove[1], last));
last = toRemove[0];
}
updatedContent.insert(0, testContent.substring(0, last));
JavaFileObject updatedFile = new TestFO(new URI("mem://" + args[0]),
updatedContent.toString());
JavacTask testTask = compiler.getTask(null,
testFileManager,
noErrors,
Arrays.asList("-processor", "Processor",
"-Atarget=" + e.getValue()),
null,
Arrays.asList(updatedFile));
try {
testTask.analyze();
} catch (Throwable exc) {
System.out.println("error while processing:");
System.out.println(updatedContent);
throw exc;
}
JavacTask testTask2 = compiler.getTask(null,
testFileManager,
new DiagnosticCollector<JavaFileObject>(),
null,
null,
Arrays.asList(updatedFile));
try {
testTask2.analyze();
} catch (Throwable exc) {
System.out.println("error while processing:");
System.out.println(updatedContent);
throw exc;
}
}
}
private static final class TestFO extends SimpleJavaFileObject {
private final String content;
public TestFO(URI uri, String content) {
super(uri, Kind.SOURCE);
this.content = content;
}
@Override public CharSequence getCharContent(boolean ignoreEncodingErrors) throws IOException {
return content;
}
@Override public boolean isNameCompatible(String simpleName, Kind kind) {
return true;
}
}
private static final class TestFM extends ForwardingJavaFileManager<JavaFileManager> {
public TestFM(JavaFileManager fileManager) {
super(fileManager);
}
@Override
public boolean isSameFile(FileObject a, FileObject b) {
return a.equals(b);
}
}
}