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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.ExceptionsAttribute;
import proguard.classfile.constant.ClassConstant;
import proguard.classfile.constant.visitor.ConstantVisitor;

/**
 * This {@link ConstantVisitor} adds all class constants that it visits to the given target
 * exceptions attribute.
 *
 * @author Eric Lafortune
 */
public class ExceptionAdder implements ConstantVisitor {
  private final ConstantAdder constantAdder;
  private final ExceptionsAttributeEditor exceptionsAttributeEditor;

  /**
   * Creates a new ExceptionAdder that will copy classes into the given target exceptions attribute.
   */
  public ExceptionAdder(ProgramClass targetClass, ExceptionsAttribute targetExceptionsAttribute) {
    constantAdder = new ConstantAdder(targetClass);
    exceptionsAttributeEditor = new ExceptionsAttributeEditor(targetExceptionsAttribute);
  }

  // Implementations for ConstantVisitor.

  public void visitClassConstant(Clazz clazz, ClassConstant classConstant) {
    // Add a class constant to the constant pool.
    constantAdder.visitClassConstant(clazz, classConstant);

    // Add the index of the class constant to the list of exceptions.
    exceptionsAttributeEditor.addException(constantAdder.getConstantIndex());
  }
}