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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.attribute.annotation.*;
import proguard.util.ArrayUtil;

/**
 * This class can add annotations to a given parameter annotations attribute. Annotations to be
 * added must have been filled out beforehand.
 *
 * @author Eric Lafortune
 */
public class ParameterAnnotationsAttributeEditor {
  private ParameterAnnotationsAttribute targetParameterAnnotationsAttribute;

  /**
   * Creates a new ParameterAnnotationsAttributeEditor that will edit annotations in the given
   * parameter annotations attribute.
   */
  public ParameterAnnotationsAttributeEditor(
      ParameterAnnotationsAttribute targetParameterAnnotationsAttribute) {
    this.targetParameterAnnotationsAttribute = targetParameterAnnotationsAttribute;
  }

  /** Adds a given annotation to the annotations attribute. */
  public void addAnnotation(int parameterIndex, Annotation annotation) {
    targetParameterAnnotationsAttribute.parameterAnnotations[parameterIndex] =
        ArrayUtil.add(
            targetParameterAnnotationsAttribute.parameterAnnotations[parameterIndex],
            targetParameterAnnotationsAttribute.u2parameterAnnotationsCount[parameterIndex]++,
            annotation);
  }

  /** Deletes a given annotation from the annotations attribute. */
  public void deleteAnnotation(int parameterIndex, Annotation annotation) {
    int index =
        findAnnotationIndex(
            annotation,
            targetParameterAnnotationsAttribute.parameterAnnotations[parameterIndex],
            targetParameterAnnotationsAttribute.u2parameterAnnotationsCount[parameterIndex]);
    deleteAnnotation(parameterIndex, index);
  }

  /** Deletes the annotation at the given index from the annotations attribute. */
  public void deleteAnnotation(int parameterIndex, int annotationIndex) {
    ArrayUtil.remove(
        targetParameterAnnotationsAttribute.parameterAnnotations[parameterIndex],
        targetParameterAnnotationsAttribute.u2parameterAnnotationsCount[parameterIndex],
        annotationIndex);
    targetParameterAnnotationsAttribute.u2parameterAnnotationsCount[parameterIndex]--;
  }

  private int findAnnotationIndex(
      Annotation annotation, Annotation[] annotations, int annotationCount) {
    for (int index = 0; index < annotationCount; index++) {
      if (annotation == annotations[index]) {
        return index;
      }
    }
    return -1;
  }
}