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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.attribute.visitor.ExceptionInfoVisitor;

/**
 * This {@link ExceptionInfoVisitor} adds all exception information that it visits to the given
 * target code attribute.
 *
 * @author Eric Lafortune
 */
public class ExceptionInfoAdder implements ExceptionInfoVisitor {
  private final ConstantAdder constantAdder;
  private final CodeAttributeComposer codeAttributeComposer;

  /**
   * Creates a new ExceptionAdder that will copy exceptions into the given target code attribute.
   */
  public ExceptionInfoAdder(ProgramClass targetClass, CodeAttributeComposer targetComposer) {
    constantAdder = new ConstantAdder(targetClass);
    codeAttributeComposer = targetComposer;
  }

  // Implementations for ExceptionInfoVisitor.

  public void visitExceptionInfo(
      Clazz clazz, Method method, CodeAttribute codeAttribute, ExceptionInfo exceptionInfo) {
    // Create a copy of the exception info.
    ExceptionInfo newExceptionInfo =
        new ExceptionInfo(
            exceptionInfo.u2startPC,
            exceptionInfo.u2endPC,
            exceptionInfo.u2handlerPC,
            exceptionInfo.u2catchType == 0
                ? 0
                : constantAdder.addConstant(clazz, exceptionInfo.u2catchType));

    // Add the completed exception info.
    codeAttributeComposer.appendException(newExceptionInfo);
  }
}