/*
 *
 * 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.dexlib.Code.Opcode;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.ibm.wala.dalvik.classLoader.DexIMethod;

public class Switch extends Instruction {
	private static final Logger logger = LoggerFactory.getLogger(Switch.class);

    public final int regA;
    public final int tableAddressOffset;
    public SwitchPad pad;
    private int[] casesAndLabels;
    private int defaultLabel;

    public Switch(int instLoc, int regA, int tableAddressOffset, Opcode opcode, DexIMethod method)
    {
        super(instLoc, opcode, method);
        this.regA = regA;
        this.tableAddressOffset = tableAddressOffset;
    }

    public void setSwitchPad (SwitchPad pad)
    {
        this.pad = pad;
        computeCasesAndLabels();
    }

    private void computeCasesAndLabels() {
        casesAndLabels = pad.getLabelsAndOffsets();
        for (int i = 1; i < casesAndLabels.length; i+=2)
            casesAndLabels[i] = method.getInstructionIndex(pc+casesAndLabels[i]);

        defaultLabel = method.getInstructionIndex(pc + pad.getDefaultOffset());
        logger.debug("SwitchInstruction");
        for (int i = 0; i < casesAndLabels.length; i+=2) {
        	logger.debug("\tcase: " + casesAndLabels[i] + 
        			" label: "+casesAndLabels[i+1]);
        }
        logger.debug("\tdefaultLabel: " + defaultLabel);
    }

    public int[] getOffsets()
    {
        return pad.getOffsets();
    }

    public int getDefaultLabel()
    {
        return defaultLabel;
    }

    public int[] getCasesAndLabels() {
        return casesAndLabels;
    }

    @Override
    public int[] getBranchTargets() {
        int[] r = new int[casesAndLabels.length / 2 + 1];
        r[0] = defaultLabel;
        for (int i = 1; i < r.length; i++) {
            r[i] = casesAndLabels[(i - 1) * 2 + 1];
        }
        return r;
    }

    @Override
    public void visit(Visitor visitor)
    {
        visitor.visitSwitch(this);
    }

}
