plugins/java-decompiler/test/org/jetbrains/java/decompiler/IdeaDecompilerTest.java

/*
 * Copyright 2000-2014 JetBrains s.r.o.
 *
 * 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 org.jetbrains.java.decompiler;

import com.intellij.openapi.fileTypes.StdFileTypes;
import com.intellij.openapi.vfs.StandardFileSystems;
import com.intellij.openapi.vfs.VfsUtilCore;
import com.intellij.openapi.vfs.VirtualFile;
import com.intellij.openapi.vfs.VirtualFileVisitor;
import com.intellij.psi.PsiElement;
import com.intellij.psi.PsiFile;
import com.intellij.psi.impl.compiled.ClsFileImpl;
import com.intellij.testFramework.PlatformTestUtil;
import com.intellij.testFramework.fixtures.LightCodeInsightFixtureTestCase;
import org.jetbrains.annotations.NotNull;

public class IdeaDecompilerTest extends LightCodeInsightFixtureTestCase {
  private static final String BANNER =
    "//\n" +
    "// Source code recreated from a .class file by IntelliJ IDEA\n" +
    "// (powered by Fernflower decompiler)\n" +
    "//\n\n";

  public void testSimple() {
    String path = PlatformTestUtil.getRtJarPath() + "!/java/lang/String.class";
    VirtualFile file = StandardFileSystems.jar().findFileByPath(path);
    assertNotNull(path, file);

    String decompiled = new IdeaDecompiler().getText(file).toString();
    assertTrue(decompiled.startsWith(BANNER + "package java.lang;\n"));
    assertTrue(decompiled, decompiled.contains("public final class String"));
    assertTrue(decompiled, decompiled.contains("@deprecated"));
    assertTrue(decompiled, decompiled.contains("private static class CaseInsensitiveComparator"));
    assertFalse(decompiled, decompiled.contains("{ /* compiled code */ }"));
    assertFalse(decompiled, decompiled.contains("synthetic"));
  }

  public void testStubCompatibility() {
    String path = PlatformTestUtil.getRtJarPath() + "!/java";
    VirtualFile dir = StandardFileSystems.jar().findFileByPath(path);
    assertNotNull(path, dir);
    doTestStubCompatibility(dir);
  }

  private void doTestStubCompatibility(VirtualFile root) {
    VfsUtilCore.visitChildrenRecursively(root, new VirtualFileVisitor() {
      @Override
      public boolean visitFile(@NotNull VirtualFile file) {
        if (file.isDirectory()) {
          System.out.println(file.getPath());
        }
        else if (file.getFileType() == StdFileTypes.CLASS && !file.getName().contains("$")) {
          PsiFile clsFile = getPsiManager().findFile(file);
          assertNotNull(file.getPath(), clsFile);
          PsiElement mirror = ((ClsFileImpl)clsFile).getMirror();
          String decompiled = mirror.getText();
          assertTrue(file.getPath(), decompiled.contains(file.getNameWithoutExtension()));
        }
        return true;
      }
    });
  }
}