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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.attribute;

import proguard.classfile.Clazz;
import proguard.classfile.visitor.ClassVisitor;
import proguard.util.SimpleProcessable;

/**
 * Representation of a local variable table entry.
 *
 * @author Eric Lafortune
 */
public class LocalVariableInfo extends SimpleProcessable implements Comparable {
  public int u2startPC;
  public int u2length;
  public int u2nameIndex;
  public int u2descriptorIndex;
  public int u2index;

  /**
   * An extra field pointing to the referenced Clazz object. This field is typically filled out by
   * the {@link
   * proguard.classfile.util.ClassReferenceInitializer
   * ClassReferenceInitializer}.
   */
  public Clazz referencedClass;

  /** Creates an uninitialized LocalVariableInfo. */
  public LocalVariableInfo() {}

  /** Creates an initialized LocalVariableInfo. */
  public LocalVariableInfo(
      int u2startPC, int u2length, int u2nameIndex, int u2descriptorIndex, int u2index) {
    this.u2startPC = u2startPC;
    this.u2length = u2length;
    this.u2nameIndex = u2nameIndex;
    this.u2descriptorIndex = u2descriptorIndex;
    this.u2index = u2index;
  }

  /** Returns the name. */
  public String getName(Clazz clazz) {
    return clazz.getString(u2nameIndex);
  }

  /** Returns the descriptor. */
  public String getDescriptor(Clazz clazz) {
    return clazz.getString(u2descriptorIndex);
  }

  /** Lets the referenced class accept the given visitor. */
  public void referencedClassAccept(ClassVisitor classVisitor) {
    if (referencedClass != null) {
      referencedClass.accept(classVisitor);
    }
  }

  // Implementations for Comparable.

  public int compareTo(Object object) {
    LocalVariableInfo other = (LocalVariableInfo) object;

    return this.u2startPC < other.u2startPC
        ? -1
        : this.u2startPC > other.u2startPC
            ? 1
            : this.u2index < other.u2index
                ? -1
                : this.u2index > other.u2index
                    ? 1
                    : this.u2length < other.u2length
                        ? -1
                        : this.u2length > other.u2length
                            ? 1
                            : this.u2descriptorIndex < other.u2descriptorIndex
                                ? -1
                                : this.u2descriptorIndex > other.u2descriptorIndex
                                    ? 1
                                    : this.u2nameIndex < other.u2nameIndex
                                        ? -1
                                        : this.u2nameIndex > other.u2nameIndex ? 1 : 0;
  }
}