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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.editor;

import proguard.classfile.*;
import proguard.classfile.attribute.*;
import proguard.classfile.constant.*;
import proguard.classfile.constant.visitor.ConstantVisitor;
import proguard.classfile.visitor.ClassVisitor;
import proguard.util.ArrayUtil;

/**
 * This {@link ConstantVisitor} and {@link ClassVisitor} adds the class constants or the classes
 * that it visits to the given target permitted classes attribute.
 */
public class PermittedSubclassAdder implements ConstantVisitor, ClassVisitor {

  private final ConstantPoolEditor constantPoolEditor;
  private final PermittedSubclassesAttribute targetPermittedSubclassesAttribute;

  /**
   * Creates a new PermittedSubclassAdder that will add classes to the given target nest members
   * attribute.
   */
  public PermittedSubclassAdder(
      ProgramClass targetClass, PermittedSubclassesAttribute targetPermittedSubclassesAttribute) {
    this.constantPoolEditor = new ConstantPoolEditor(targetClass);
    this.targetPermittedSubclassesAttribute = targetPermittedSubclassesAttribute;
  }

  // Implementations for ConstantVisitor.

  public void visitAnyConstant(Clazz clazz, Constant constant) {}

  public void visitClassConstant(Clazz clazz, ClassConstant classConstant) {
    targetPermittedSubclassesAttribute.u2classes =
        ArrayUtil.add(
            targetPermittedSubclassesAttribute.u2classes,
            targetPermittedSubclassesAttribute.u2classesCount++,
            constantPoolEditor.addClassConstant(
                classConstant.getName(clazz), classConstant.referencedClass));
  }

  // Implementations for ClassVisitor.

  @Override
  public void visitAnyClass(Clazz clazz) {
    targetPermittedSubclassesAttribute.u2classes =
        ArrayUtil.add(
            targetPermittedSubclassesAttribute.u2classes,
            targetPermittedSubclassesAttribute.u2classesCount++,
            constantPoolEditor.addClassConstant(clazz));
  }
}