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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.instruction;

import java.util.*;

/**
 * This {@link Instruction} represents a switch instruction.
 *
 * @author Eric Lafortune
 */
public abstract class SwitchInstruction extends Instruction {
  public int defaultOffset;
  public int[] jumpOffsets;

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

  /**
   * Creates a new SwitchInstruction with the given arguments. All offsets are relative to this
   * instruction's offset.
   */
  public SwitchInstruction(byte opcode, int defaultOffset, int[] jumpOffsets) {
    this.opcode = opcode;
    this.defaultOffset = defaultOffset;
    this.jumpOffsets = jumpOffsets;
  }

  /**
   * Copies the given instruction into this instruction.
   *
   * @param switchInstruction the instruction to be copied.
   * @return this instruction.
   */
  public SwitchInstruction copy(SwitchInstruction switchInstruction) {
    this.opcode = switchInstruction.opcode;
    this.defaultOffset = switchInstruction.defaultOffset;
    this.jumpOffsets = switchInstruction.jumpOffsets;

    return this;
  }

  // Implementations for Instruction.

  public String toString(int offset) {
    return "[" + offset + "] " + toString() + " (target=" + (offset + defaultOffset) + ")";
  }

  // Implementations for Object.

  @Override
  public String toString() {
    return getName() + " (" + jumpOffsets.length + " offsets, default=" + defaultOffset + ")";
  }

  @Override
  public boolean equals(Object o) {
    if (this == o) return true;
    if (o == null || getClass() != o.getClass()) return false;
    SwitchInstruction that = (SwitchInstruction) o;
    return opcode == that.opcode
        && defaultOffset == that.defaultOffset
        && Arrays.equals(jumpOffsets, that.jumpOffsets);
  }

  @Override
  public int hashCode() {
    int result = Objects.hash(opcode, defaultOffset);
    result = 31 * result + Arrays.hashCode(jumpOffsets);
    return result;
  }
}