/*
* Copyright (c) 2013, 2015, 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 com.sun.source.tree.ClassTree;
import com.sun.source.tree.CompilationUnitTree;
import com.sun.source.tree.MethodTree;
import com.sun.source.tree.NewClassTree;
import com.sun.source.tree.Tree;
import com.sun.source.tree.VariableTree;
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.code.Flags;
import com.sun.tools.javac.file.JavacFileManager;
import com.sun.tools.javac.tree.JCTree.JCMethodDecl;
import java.io.File;
import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Iterator;
import java.util.List;
import javax.tools.Diagnostic;
import javax.tools.DiagnosticListener;
import javax.tools.FileObject;
import javax.tools.ForwardingJavaFileManager;
import javax.tools.JavaFileManager;
import javax.tools.JavaFileObject;
import javax.tools.SimpleJavaFileObject;
/**Takes a source file, parses it once to get the warnings inside the file and
* then for each and every declaration in the file, it tries to place
* the @SuppressWarnings annotation on the declaration and verifies than no
* warnings are produced inside the declaration, but all are produced outside it.
*
* Currently only works with <code>unchecked,deprecation,cast,divzero</code> warnings.
*/
public class VerifySuppressWarnings {
private static final List<String> STANDARD_PARAMS =
Arrays.asList("-Xlint:unchecked,deprecation,cast,divzero");
public static void main(String... args) throws IOException, URISyntaxException {
if (args.length != 1) throw new IllegalStateException("Must provide class name!");
String testContent = null;
List<File> sourcePath = new ArrayList<>();
for (String sourcePaths : System.getProperty("test.src.path").split(":")) {
sourcePath.add(new File(sourcePaths));
}
JavacFileManager fm = JavacTool.create().getStandardFileManager(null, null, null);
for (File sp : sourcePath) {
File inp = new File(sp, args[0]);
if (inp.canRead()) {
testContent = fm.getJavaFileObject(inp.toPath()).getCharContent(true).toString();
}
}
if (testContent == null) throw new IllegalStateException();
final List<Diagnostic<?>> diagnostics = new ArrayList<>();
DiagnosticListener<JavaFileObject> collectDiagnostics = new DiagnosticListener<JavaFileObject>() {
@Override public void report(Diagnostic<? extends JavaFileObject> diagnostic) {
diagnostics.add(diagnostic);
}
};
JavaFileObject testFile = new TestFO(new URI("mem://" + args[0]), testContent);
JavacTask task = JavacTool.create().getTask(null,
new TestFM(fm),
collectDiagnostics,
STANDARD_PARAMS,
null,
Arrays.asList(testFile));
final Trees trees = Trees.instance(task);
final CompilationUnitTree cut = task.parse().iterator().next();
task.analyze();
final List<int[]> declarationSpans = new ArrayList<>();
new TreeScanner<Void, Void>() {
@Override public Void visitClass(ClassTree node, Void p) {
handleDeclaration(node);
return super.visitClass(node, p);
}
@Override public Void visitMethod(MethodTree node, Void p) {
handleDeclaration(node);
return super.visitMethod(node, p);
}
@Override public Void visitVariable(VariableTree node, Void p) {
handleDeclaration(node);
return super.visitVariable(node, p);
}
@Override
public Void visitNewClass(NewClassTree node, Void p) {
if (node.getClassBody() != null) {
scan(node.getClassBody().getMembers(), null);
}
return null;
}
private void handleDeclaration(Tree node) {
int endPos = (int) trees.getSourcePositions().getEndPosition(cut, node);
if (endPos == (-1)) {
if (node.getKind() == Tree.Kind.METHOD && (((JCMethodDecl) node).getModifiers().flags & Flags.GENERATEDCONSTR) != 0) {
return ;
}
throw new IllegalStateException();
}
declarationSpans.add(new int[] {(int) trees.getSourcePositions().getStartPosition(cut, node), endPos});
}
}.scan(cut, null);
for (final int[] declarationSpan : declarationSpans) {
final String suppressWarnings =
"@SuppressWarnings({\"deprecation\", \"unchecked\", \"serial\", \"divzero\"})";
final String updatedContent = testContent.substring(0, declarationSpan[0]) + suppressWarnings + testContent.substring(declarationSpan[0]);
final List<Diagnostic<?>> foundErrors = new ArrayList<>(diagnostics);
DiagnosticListener<JavaFileObject> verifyDiagnostics = new DiagnosticListener<JavaFileObject>() {
@Override public void report(Diagnostic<? extends JavaFileObject> diagnostic) {
long adjustedPos = diagnostic.getPosition();
if (adjustedPos >= declarationSpan[0]) adjustedPos -= suppressWarnings.length();
if (declarationSpan[0] <= adjustedPos && adjustedPos <= declarationSpan[1]) {
throw new IllegalStateException("unsuppressed: " + diagnostic.getMessage(null));
}
boolean found = false;
for (Iterator<Diagnostic<?>> it = foundErrors.iterator(); it.hasNext();) {
Diagnostic<?> d = it.next();
if (d.getPosition() == adjustedPos && d.getCode().equals(diagnostic.getCode())) {
it.remove();
found = true;
break;
}
}
if (!found) {
throw new IllegalStateException("diagnostic not originally reported: " + diagnostic.getMessage(null));
}
}
};
JavaFileObject updatedFile = new TestFO(new URI("mem://" + args[0]), updatedContent);
JavacTask testTask = JavacTool.create().getTask(null,
new TestFM(fm),
verifyDiagnostics,
STANDARD_PARAMS,
null,
Arrays.asList(updatedFile));
testTask.analyze();
for (Diagnostic<?> d : foundErrors) {
if (d.getPosition() < declarationSpan[0] || declarationSpan[1] < d.getPosition()) {
throw new IllegalStateException("missing: " + d.getMessage(null));
}
}
}
}
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);
}
}
}