Java example source code file (ConversionInstruction.java)

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Java - Java tags/keywords

classgenexception, conversioninstruction, never, stackconsumer, stackproducer, typedinstruction, unknown

The ConversionInstruction.java Java example source code

/*
 * reserved comment block
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 */
package com.sun.org.apache.bcel.internal.generic;

/* ====================================================================
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2001 The Apache Software Foundation.  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.
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 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
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 * 4. The names "Apache" and "Apache Software Foundation" and
 *    "Apache BCEL" must not be used to endorse or promote products
 *    derived from this software without prior written permission. For
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 *
 * 5. Products derived from this software may not be called "Apache",
 *    "Apache BCEL", nor may "Apache" appear in their name, without
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 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */
import com.sun.org.apache.bcel.internal.Constants;
/**
 * Super class for the x2y family of instructions.
 *
 * @author  <A HREF="mailto:markus.dahm@berlin.de">M. Dahm
 */
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
   */
  public Type getType(ConstantPoolGen cp) {
    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);
    }
  }
}