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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.ParameterInfoVisitor;

/**
 * This {@link ParameterInfoVisitor} adds all parameter information that it visits to the given
 * target method parameters attribute.
 */
public class ParameterInfoAdder implements ParameterInfoVisitor {
  private final ConstantAdder constantAdder;
  private final MethodParametersAttribute targetMethodParametersAttribute;

  /**
   * Creates a new ParameterInfoAdder that will copy parameter information into the given target
   * method parameters attribute.
   */
  public ParameterInfoAdder(
      ProgramClass targetClass, MethodParametersAttribute targetMethodParametersAttribute) {
    this.constantAdder = new ConstantAdder(targetClass);
    this.targetMethodParametersAttribute = targetMethodParametersAttribute;
  }

  // Implementations for ParameterInfoVisitor.

  public void visitParameterInfo(
      Clazz clazz, Method method, int parameterIndex, ParameterInfo parameterInfo) {
    // Create a new parameter.
    int newNameIndex =
        parameterInfo.u2nameIndex == 0
            ? 0
            : constantAdder.addConstant(clazz, parameterInfo.u2nameIndex);

    ParameterInfo newParameterInfo = new ParameterInfo(newNameIndex, parameterInfo.u2accessFlags);

    // Add it to the target.
    targetMethodParametersAttribute.parameters[parameterIndex] = newParameterInfo;
  }
}