/*
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html.
 *
 * This file is a derivative of code released under the terms listed below.
 *
 */
/*
 *
 * Copyright (c) 2009-2012,
 *
 *  Adam Fuchs          <afuchs@cs.umd.edu>
 *  Avik Chaudhuri      <avik@cs.umd.edu>
 *  Steve Suh           <suhsteve@gmail.com>
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * 3. The names of the contributors may not be used to endorse or promote
 * products derived from this software without specific prior written
 * permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 *
 */

package com.ibm.wala.dalvik.dex.instructions;

import org.jf.dexlib2.iface.instruction.SwitchElement;
import org.jf.dexlib2.iface.instruction.SwitchPayload;

public class PackedSwitchPad implements SwitchPad {

  public int firstValue;
  public final int[] offsets;
  public final int defaultOffset;
  private int[] labelsAndOffsets;
  private int[] values;

  public PackedSwitchPad(SwitchPayload inst, int defaultOffset) {
    int i = 0;
    this.offsets = new int[inst.getSwitchElements().size()];
    for (SwitchElement elt : inst.getSwitchElements()) {
      if (i == 0) {
        firstValue = elt.getKey();
      }
      offsets[i++] = elt.getOffset();
    }
    this.defaultOffset = defaultOffset;
  }

  @Override
  public int[] getOffsets() {
    return offsets;
  }

  @Override
  public int[] getValues() {
    if (values != null) return values;
    values = new int[offsets.length];
    for (int i = 0; i < offsets.length; i++) {
      values[i] = firstValue + i;
    }
    return values;
  }

  @Override
  public int getDefaultOffset() {
    // return Integer.MIN_VALUE;
    return defaultOffset;
  }

  @Override
  public int[] getLabelsAndOffsets() {
    if (labelsAndOffsets != null) return labelsAndOffsets;
    //      labelsAndOffsets = new int[offsets.length * 2 + 2];
    labelsAndOffsets = new int[offsets.length * 2];
    for (int i = 0; i < offsets.length; i++) {
      labelsAndOffsets[i * 2] = firstValue + i;
      labelsAndOffsets[i * 2 + 1] = offsets[i];
    }
    //      labelsAndOffsets[offsets.length*2] = getDefaultLabel();
    //      labelsAndOffsets[offsets.length*2+1] = defaultOffset;
    return labelsAndOffsets;
  }
}
