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/*
 * Copyright 2012, Google Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * 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.
 *     * Neither the name of Google Inc. nor the names of its
 * contributors may 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,
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 */

package org.jf.dexlib2.immutable.instruction;

import org.jf.dexlib2.Format;
import org.jf.dexlib2.Opcode;
import org.jf.dexlib2.iface.instruction.formats.Instruction23x;
import org.jf.dexlib2.util.Preconditions;

import javax.annotation.Nonnull;

public class ImmutableInstruction23x extends ImmutableInstruction implements Instruction23x {
    public static final Format FORMAT = Format.Format23x;

    protected final int registerA;
    protected final int registerB;
    protected final int registerC;

    public ImmutableInstruction23x(@Nonnull Opcode opcode,
                                   int registerA,
                                   int registerB,
                                   int registerC) {
        super(opcode);
        this.registerA = Preconditions.checkByteRegister(registerA);
        this.registerB = Preconditions.checkByteRegister(registerB);
        this.registerC = Preconditions.checkByteRegister(registerC);
    }

    public static ImmutableInstruction23x of(Instruction23x instruction) {
        if (instruction instanceof ImmutableInstruction23x) {
            return (ImmutableInstruction23x)instruction;
        }
        return new ImmutableInstruction23x(
                instruction.getOpcode(),
                instruction.getRegisterA(),
                instruction.getRegisterB(),
                instruction.getRegisterC());
    }

    @Override public int getRegisterA() { return registerA; }
    @Override public int getRegisterB() { return registerB; }
    @Override public int getRegisterC() { return registerC; }

    @Override public Format getFormat() { return FORMAT; }
}