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	/*
	* Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
	*/
	/*
	* Licensed to the Apache Software Foundation (ASF) under one or more
	* contributor license agreements. See the NOTICE file distributed with
	* this work for additional information regarding copyright ownership.
	* The ASF licenses this file to You under the Apache License, Version 2.0
	* (the "License"); you may not use this file except in compliance with
	* the License. You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

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

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

	/**
	* Wrapper class for push operations, which are implemented either as BIPUSH,
	* LDC or xCONST_n instructions.
	*
	* @version $Id: PUSH.java 1749598 2016-06-21 20:36:33Z ggregory $
	*/
	public final class PUSH implements CompoundInstruction, VariableLengthInstruction {

	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(final ConstantPoolGen cp, final int value) {
	if ((value >= -1) && (value <= 5)) {
	instruction = InstructionConst.getInstruction(Const.ICONST_0 + value);
	} else if (Instruction.isValidByte(value)) {
	instruction = new BIPUSH((byte) value);
	} else if (Instruction.isValidShort(value)) {
	instruction = new SIPUSH((short) value);
	} else {
	instruction = new LDC(cp.addInteger(value));
	}
	}


	/**
	* @param cp Constant pool
	* @param value to be pushed
	*/
	public PUSH(final ConstantPoolGen cp, final boolean value) {
	instruction = InstructionConst.getInstruction(Const.ICONST_0 + (value ? 1 : 0));
	}


	/**
	* @param cp Constant pool
	* @param value to be pushed
	*/
	public PUSH(final ConstantPoolGen cp, final float value) {
	if (value == 0.0) {
	instruction = InstructionConst.FCONST_0;
	} else if (value == 1.0) {
	instruction = InstructionConst.FCONST_1;
	} else if (value == 2.0) {
	instruction = InstructionConst.FCONST_2;
	} else {
	instruction = new LDC(cp.addFloat(value));
	}
	}


	/**
	* @param cp Constant pool
	* @param value to be pushed
	*/
	public PUSH(final ConstantPoolGen cp, final long value) {
	if (value == 0) {
	instruction = InstructionConst.LCONST_0;
	} else if (value == 1) {
	instruction = InstructionConst.LCONST_1;
	} else {
	instruction = new LDC2_W(cp.addLong(value));
	}
	}


	/**
	* @param cp Constant pool
	* @param value to be pushed
	*/
	public PUSH(final ConstantPoolGen cp, final double value) {
	if (value == 0.0) {
	instruction = InstructionConst.DCONST_0;
	} else if (value == 1.0) {
	instruction = InstructionConst.DCONST_1;
	} else {
	instruction = new LDC2_W(cp.addDouble(value));
	}
	}


	/**
	* @param cp Constant pool
	* @param value to be pushed
	*/
	public PUSH(final ConstantPoolGen cp, final String value) {
	if (value == null) {
	instruction = InstructionConst.ACONST_NULL;
	} else {
	instruction = new LDC(cp.addString(value));
	}
	}

	/**
	*
	* @param cp
	* @param value
	* @since 6.0
	*/
	public PUSH(final ConstantPoolGen cp, final ObjectType value) {
	if (value == null) {
	instruction = InstructionConst.ACONST_NULL;
	} else {
	instruction = new LDC(cp.addClass(value));
	}
	}

	/**
	* @param cp Constant pool
	* @param value to be pushed
	*/
	public PUSH(final ConstantPoolGen cp, final 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);
	}
	}


	/**
	* creates a push object from a Character value. Warning: Make sure not to attempt to allow
	* autoboxing to create this value parameter, as an alternative constructor will be called
	*
	* @param cp Constant pool
	* @param value to be pushed
	*/
	public PUSH(final ConstantPoolGen cp, final Character value) {
	this(cp, value.charValue());
	}


	/**
	* @param cp Constant pool
	* @param value to be pushed
	*/
	public PUSH(final ConstantPoolGen cp, final Boolean value) {
	this(cp, value.booleanValue());
	}


	@Override
	public final InstructionList getInstructionList() {
	return new InstructionList(instruction);
	}


	public final Instruction getInstruction() {
	return instruction;
	}


	/**
	* @return mnemonic for instruction
	*/
	@Override
	public String toString() {
	return instruction + " (PUSH)";
	}
	}

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