proguard.classfile.editor.ParameterInfoAdder Maven / Gradle / Ivy

/*
 * 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;
    }
}