
package org.apache.commons.bcel6.generic;

import org.apache.commons.bcel6.Constants;

/**
 * Super class for the x2y family of instructions.
 *
 * @version $Id$
 */
public abstract class ConversionInstruction extends Instruction implements TypedInstruction,
        StackProducer, StackConsumer {

    /**
     * Empty constructor needed for the Class.newInstance() statement in
     * Instruction.readInstruction(). Not to be used otherwise.
     */
    ConversionInstruction() {
    }


    /**
     * @param opcode opcode of instruction
     */
    protected ConversionInstruction(short opcode) {
        super(opcode, (short) 1);
    }


    /** @return type associated with the instruction
     */
    @Override
    public Type getType( ConstantPoolGen cp ) {
        final short _opcode = super.getOpcode();
        switch (_opcode) {
            case Constants.D2I:
            case Constants.F2I:
            case Constants.L2I:
                return Type.INT;
            case Constants.D2F:
            case Constants.I2F:
            case Constants.L2F:
                return Type.FLOAT;
            case Constants.D2L:
            case Constants.F2L:
            case Constants.I2L:
                return Type.LONG;
            case Constants.F2D:
            case Constants.I2D:
            case Constants.L2D:
                return Type.DOUBLE;
            case Constants.I2B:
                return Type.BYTE;
            case Constants.I2C:
                return Type.CHAR;
            case Constants.I2S:
                return Type.SHORT;
            default: // Never reached
                throw new ClassGenException("Unknown type " + _opcode);
        }
    }
}
