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

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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.AttributeVisitor;
import proguard.classfile.visitor.*;

/**
 * This {@link ClassVisitor} deletes attributes with a given name in the program classes, fields,
 * methods, or code attributes that it visits.
 *
 * @author Eric Lafortune
 */
public class NamedAttributeDeleter implements ClassVisitor, MemberVisitor, AttributeVisitor {
  private final String attributeName;

  public NamedAttributeDeleter(String attributeName) {
    this.attributeName = attributeName;
  }

  // Implementations for ClassVisitor.

  @Override
  public void visitAnyClass(Clazz clazz) {}

  @Override
  public void visitProgramClass(ProgramClass programClass) {
    new AttributesEditor(programClass, false).deleteAttribute(attributeName);
  }

  // Implementations for MemberVisitor.

  public void visitLibraryMember(LibraryClass libraryClass, LibraryMember libraryMember) {}

  public void visitProgramMember(ProgramClass programClass, ProgramMember programMember) {
    new AttributesEditor(programClass, programMember, false).deleteAttribute(attributeName);
  }

  // Implementations for AttributeVisitor.

  public void visitAnyAttribute(Clazz clazz, Attribute attribute) {}

  public void visitCodeAttribute(Clazz clazz, Method method, CodeAttribute codeAttribute) {
    new AttributesEditor((ProgramClass) clazz, (ProgramMember) method, codeAttribute, false)
        .deleteAttribute(attributeName);
  }
}