/*
* Copyright 2014 Google Inc. All rights reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
* in compliance with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software distributed under the License
* is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
* or implied. See the License for the specific language governing permissions and limitations under
* the License.
*/
package com.google.errorprone.refaster;
import static java.nio.charset.StandardCharsets.UTF_8;
import com.google.auto.value.AutoValue;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Iterables;
import com.google.common.io.CharStreams;
import com.google.errorprone.CodeTransformer;
import com.google.errorprone.apply.DescriptionBasedDiff;
import com.google.errorprone.apply.ImportOrganizer;
import com.google.errorprone.apply.SourceFile;
import com.google.testing.compile.JavaFileObjects;
import com.sun.source.tree.CompilationUnitTree;
import com.sun.source.util.TreePath;
import com.sun.tools.javac.api.JavacTaskImpl;
import com.sun.tools.javac.api.JavacTool;
import com.sun.tools.javac.tree.JCTree.JCClassDecl;
import com.sun.tools.javac.tree.JCTree.JCCompilationUnit;
import java.io.IOException;
import java.util.Locale;
import javax.tools.DiagnosticCollector;
import javax.tools.JavaCompiler;
import javax.tools.JavaFileObject;
import javax.tools.StandardJavaFileManager;
/**
* Test helper for {@link CodeTransformer} implementations.
*
* @author lowasser@google.com (Louis Wasserman)
*/
@AutoValue
public abstract class CodeTransformerTestHelper {
public static CodeTransformerTestHelper create(CodeTransformer transformer) {
return new AutoValue_CodeTransformerTestHelper(transformer);
}
abstract CodeTransformer transformer();
public JavaFileObject transform(JavaFileObject original) {
JavaCompiler compiler = JavacTool.create();
DiagnosticCollector<JavaFileObject> diagnosticsCollector =
new DiagnosticCollector<JavaFileObject>();
StandardJavaFileManager fileManager =
compiler.getStandardFileManager(diagnosticsCollector, Locale.ENGLISH, UTF_8);
JavacTaskImpl task = (JavacTaskImpl) compiler.getTask(CharStreams.nullWriter(),
fileManager,
diagnosticsCollector,
ImmutableList.<String>of(),
null,
ImmutableList.of(original));
try {
SourceFile sourceFile = SourceFile.create(original);
Iterable<? extends CompilationUnitTree> trees = task.parse();
task.analyze();
JCCompilationUnit tree =
Iterables.getOnlyElement(Iterables.filter(trees, JCCompilationUnit.class));
DescriptionBasedDiff diff =
DescriptionBasedDiff.create(tree, ImportOrganizer.STATIC_FIRST_ORGANIZER);
transformer().apply(new TreePath(tree), task.getContext(), diff);
diff.applyDifferences(sourceFile);
return JavaFileObjects.forSourceString(
Iterables.getOnlyElement(Iterables.filter(tree.getTypeDecls(), JCClassDecl.class))
.sym
.getQualifiedName()
.toString(),
sourceFile.getSourceText());
} catch (IOException e) {
throw new RuntimeException(e);
}
}
}