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 * reserved comment block

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package com.sun.org.apache.bcel.internal.generic;

/* ====================================================================

 * The Apache Software License, Version 1.1

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 * reserved.

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 * modification, are permitted provided that the following conditions

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 */

import com.sun.org.apache.bcel.internal.Constants;

import java.io.*;

/**

 * Wrapper class for push operations, which are implemented either as BIPUSH,

 * LDC or xCONST_n instructions.

 *

 * @author  <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>

 */

public final class PUSH

  implements CompoundInstruction, VariableLengthInstruction, InstructionConstants

{

  private Instruction instruction;

  /**

   * This constructor also applies for values of type short, char, byte

   *

   * @param cp Constant pool

   * @param value to be pushed

   */

  public PUSH(ConstantPoolGen cp, int value) {

    if((value >= -1) && (value <= 5)) // Use ICONST_n

      instruction = INSTRUCTIONS[Constants.ICONST_0 + value];

    else if((value >= -128) && (value <= 127)) // Use BIPUSH

      instruction = new BIPUSH((byte)value);

    else if((value >= -32768) && (value <= 32767)) // Use SIPUSH

      instruction = new SIPUSH((short)value);

    else // If everything fails create a Constant pool entry

      instruction = new LDC(cp.addInteger(value));

  }

  /**

   * @param cp Constant pool

   * @param value to be pushed

   */

  public PUSH(ConstantPoolGen cp, boolean value) {

    instruction = INSTRUCTIONS[Constants.ICONST_0 + (value? 1 : 0)];

  }

  /**

   * @param cp Constant pool

   * @param value to be pushed

   */

  public PUSH(ConstantPoolGen cp, float value) {

    if(value == 0.0)

      instruction = FCONST_0;

    else if(value == 1.0)

      instruction = FCONST_1;

    else if(value == 2.0)

      instruction = FCONST_2;

    else // Create a Constant pool entry

      instruction = new LDC(cp.addFloat(value));

  }

  /**

   * @param cp Constant pool

   * @param value to be pushed

   */

  public PUSH(ConstantPoolGen cp, long value) {

    if(value == 0)

      instruction = LCONST_0;

    else if(value == 1)

      instruction = LCONST_1;

    else // Create a Constant pool entry

      instruction = new LDC2_W(cp.addLong(value));

  }

  /**

   * @param cp Constant pool

   * @param value to be pushed

   */

  public PUSH(ConstantPoolGen cp, double value) {

    if(value == 0.0)

      instruction = DCONST_0;

    else if(value == 1.0)

      instruction = DCONST_1;

    else // Create a Constant pool entry

      instruction = new LDC2_W(cp.addDouble(value));

  }

  /**

   * @param cp Constant pool

   * @param value to be pushed

   */

  public PUSH(ConstantPoolGen cp, String value) {

    if(value == null)

      instruction = ACONST_NULL;

    else // Create a Constant pool entry

      instruction = new LDC(cp.addString(value));

  }

  /**

   * @param cp Constant pool

   * @param value to be pushed

   */

  public PUSH(ConstantPoolGen cp, Number value) {

    if((value instanceof Integer) || (value instanceof Short) || (value instanceof Byte))

      instruction = new PUSH(cp, value.intValue()).instruction;

    else if(value instanceof Double)

      instruction = new PUSH(cp, value.doubleValue()).instruction;

    else if(value instanceof Float)

      instruction = new PUSH(cp, value.floatValue()).instruction;

    else if(value instanceof Long)

      instruction = new PUSH(cp, value.longValue()).instruction;

    else

      throw new ClassGenException("What's this: " + value);

  }

  /**

   * @param cp Constant pool

   * @param value to be pushed

   */

  public PUSH(ConstantPoolGen cp, Character value) {

    this(cp, (int)value.charValue());

  }

  /**

   * @param cp Constant pool

   * @param value to be pushed

   */

  public PUSH(ConstantPoolGen cp, Boolean value) {

    this(cp, value.booleanValue());

  }

  public final InstructionList getInstructionList() {

    return new InstructionList(instruction);

  }

  public final Instruction getInstruction() {

    return instruction;

  }

  /**

   * @return mnemonic for instruction

   */

  public String toString() {

    return instruction.toString() + " (PUSH)";

  }

}