proguard.classfile.visitor.ClassVersionSetter Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of proguard-core Show documentation

ProGuardCORE is a free library to read, analyze, modify, and write Java class files.

There is a newer version: 9.1.6

/*
 * ProGuardCORE -- library to process Java bytecode.
 *
 * Copyright (c) 2002-2020 Guardsquare NV
 *
 * 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 proguard.classfile.visitor;

import java.util.Set;
import proguard.classfile.*;

/**
 * This {@link ClassVisitor} sets the version number of the program classes that it visits.
 *
 * @author Eric Lafortune
 */
public class ClassVersionSetter implements ClassVisitor {
  private final int classVersion;

  private final Set newerClassVersions;

  /**
   * Creates a new ClassVersionSetter.
   *
   * @param classVersion the class version number.
   */
  public ClassVersionSetter(int classVersion) {
    this(classVersion, null);
  }

  /**
   * Creates a new ClassVersionSetter that also stores any newer class version numbers that it
   * encounters while visiting program classes.
   *
   * @param classVersion the class version number.
   * @param newerClassVersions the Set in which newer class version numbers can be
   *     collected.
   */
  public ClassVersionSetter(int classVersion, Set newerClassVersions) {
    this.classVersion = classVersion;
    this.newerClassVersions = newerClassVersions;
  }

  // Implementations for ClassVisitor.

  @Override
  public void visitAnyClass(Clazz clazz) {}

  @Override
  public void visitProgramClass(ProgramClass programClass) {
    // Only ProgramClasses have version numbers.

    if (programClass.u4version > classVersion && newerClassVersions != null) {
      newerClassVersions.add(programClass.u4version);
    }

    programClass.u4version = classVersion;
  }
}