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	/*
	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
	*
	* This code is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License version 2 only, as
	* published by the Free Software Foundation. Oracle designates this
	* particular file as subject to the "Classpath" exception as provided
	* by Oracle in the LICENSE file that accompanied this code.
	*
	* This code is distributed in the hope that it will be useful, but WITHOUT
	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
	* version 2 for more details (a copy is included in the LICENSE file that
	* accompanied this code).
	*
	* You should have received a copy of the GNU General Public License version
	* 2 along with this work; if not, write to the Free Software Foundation,
	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
	*
	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
	* or visit www.oracle.com if you need additional information or have any
	* questions.
	*/

	/*
	* This file is available under and governed by the GNU General Public
	* License version 2 only, as published by the Free Software Foundation.
	* However, the following notice accompanied the original version of this
	* file:
	*
	* ASM: a very small and fast Java bytecode manipulation framework
	* Copyright (c) 2000-2011 INRIA, France Telecom
	* 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.
	* 2. 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.
	* 3. Neither the name of the copyright holders 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, DATA, OR PROFITS; OR BUSINESS
	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
	* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
	* THE POSSIBILITY OF SUCH DAMAGE.
	*/
	package jdk.internal.org.objectweb.asm;

	/**
	* A constant pool item. Constant pool items can be created with the 'newXXX'
	* methods in the {@link ClassWriter} class.
	*
	* @author Eric Bruneton
	*/
	final class Item {

	/**
	* Index of this item in the constant pool.
	*/
	int index;

	/**
	* Type of this constant pool item. A single class is used to represent all
	* constant pool item types, in order to minimize the bytecode size of this
	* package. The value of this field is one of {@link ClassWriter#INT},
	* {@link ClassWriter#LONG}, {@link ClassWriter#FLOAT},
	* {@link ClassWriter#DOUBLE}, {@link ClassWriter#UTF8},
	* {@link ClassWriter#STR}, {@link ClassWriter#CLASS},
	* {@link ClassWriter#NAME_TYPE}, {@link ClassWriter#FIELD},
	* {@link ClassWriter#METH}, {@link ClassWriter#IMETH},
	* {@link ClassWriter#MTYPE}, {@link ClassWriter#INDY}.
	*
	* MethodHandle constant 9 variations are stored using a range of 9 values
	* from {@link ClassWriter#HANDLE_BASE} + 1 to
	* {@link ClassWriter#HANDLE_BASE} + 9.
	*
	* Special Item types are used for Items that are stored in the ClassWriter
	* {@link ClassWriter#typeTable}, instead of the constant pool, in order to
	* avoid clashes with normal constant pool items in the ClassWriter constant
	* pool's hash table. These special item types are
	* {@link ClassWriter#TYPE_NORMAL}, {@link ClassWriter#TYPE_UNINIT} and
	* {@link ClassWriter#TYPE_MERGED}.
	*/
	int type;

	/**
	* Value of this item, for an integer item.
	*/
	int intVal;

	/**
	* Value of this item, for a long item.
	*/
	long longVal;

	/**
	* First part of the value of this item, for items that do not hold a
	* primitive value.
	*/
	String strVal1;

	/**
	* Second part of the value of this item, for items that do not hold a
	* primitive value.
	*/
	String strVal2;

	/**
	* Third part of the value of this item, for items that do not hold a
	* primitive value.
	*/
	String strVal3;

	/**
	* The hash code value of this constant pool item.
	*/
	int hashCode;

	/**
	* Link to another constant pool item, used for collision lists in the
	* constant pool's hash table.
	*/
	Item next;

	/**
	* Constructs an uninitialized {@link Item}.
	*/
	Item() {
	}

	/**
	* Constructs an uninitialized {@link Item} for constant pool element at
	* given position.
	*
	* @param index
	* index of the item to be constructed.
	*/
	Item(final int index) {
	this.index = index;
	}

	/**
	* Constructs a copy of the given item.
	*
	* @param index
	* index of the item to be constructed.
	* @param i
	* the item that must be copied into the item to be constructed.
	*/
	Item(final int index, final Item i) {
	this.index = index;
	type = i.type;
	intVal = i.intVal;
	longVal = i.longVal;
	strVal1 = i.strVal1;
	strVal2 = i.strVal2;
	strVal3 = i.strVal3;
	hashCode = i.hashCode;
	}

	/**
	* Sets this item to an integer item.
	*
	* @param intVal
	* the value of this item.
	*/
	void set(final int intVal) {
	this.type = ClassWriter.INT;
	this.intVal = intVal;
	this.hashCode = 0x7FFFFFFF & (type + intVal);
	}

	/**
	* Sets this item to a long item.
	*
	* @param longVal
	* the value of this item.
	*/
	void set(final long longVal) {
	this.type = ClassWriter.LONG;
	this.longVal = longVal;
	this.hashCode = 0x7FFFFFFF & (type + (int) longVal);
	}

	/**
	* Sets this item to a float item.
	*
	* @param floatVal
	* the value of this item.
	*/
	void set(final float floatVal) {
	this.type = ClassWriter.FLOAT;
	this.intVal = Float.floatToRawIntBits(floatVal);
	this.hashCode = 0x7FFFFFFF & (type + (int) floatVal);
	}

	/**
	* Sets this item to a double item.
	*
	* @param doubleVal
	* the value of this item.
	*/
	void set(final double doubleVal) {
	this.type = ClassWriter.DOUBLE;
	this.longVal = Double.doubleToRawLongBits(doubleVal);
	this.hashCode = 0x7FFFFFFF & (type + (int) doubleVal);
	}

	/**
	* Sets this item to an item that do not hold a primitive value.
	*
	* @param type
	* the type of this item.
	* @param strVal1
	* first part of the value of this item.
	* @param strVal2
	* second part of the value of this item.
	* @param strVal3
	* third part of the value of this item.
	*/
	void set(final int type, final String strVal1, final String strVal2,
	final String strVal3) {
	this.type = type;
	this.strVal1 = strVal1;
	this.strVal2 = strVal2;
	this.strVal3 = strVal3;
	switch (type) {
	case ClassWriter.CLASS:
	this.intVal = 0; // intVal of a class must be zero, see visitInnerClass
	case ClassWriter.UTF8:
	case ClassWriter.STR:
	case ClassWriter.MTYPE:
	case ClassWriter.TYPE_NORMAL:
	hashCode = 0x7FFFFFFF & (type + strVal1.hashCode());
	return;
	case ClassWriter.NAME_TYPE: {
	hashCode = 0x7FFFFFFF & (type + strVal1.hashCode()
	* strVal2.hashCode());
	return;
	}
	// ClassWriter.FIELD:
	// ClassWriter.METH:
	// ClassWriter.IMETH:
	// ClassWriter.HANDLE_BASE + 1..9
	default:
	hashCode = 0x7FFFFFFF & (type + strVal1.hashCode()
	* strVal2.hashCode() * strVal3.hashCode());
	}
	}

	/**
	* Sets the item to an InvokeDynamic item.
	*
	* @param name
	* invokedynamic's name.
	* @param desc
	* invokedynamic's desc.
	* @param bsmIndex
	* zero based index into the class attribute BootrapMethods.
	*/
	void set(String name, String desc, int bsmIndex) {
	this.type = ClassWriter.INDY;
	this.longVal = bsmIndex;
	this.strVal1 = name;
	this.strVal2 = desc;
	this.hashCode = 0x7FFFFFFF & (ClassWriter.INDY + bsmIndex
	* strVal1.hashCode() * strVal2.hashCode());
	}

	/**
	* Sets the item to a BootstrapMethod item.
	*
	* @param position
	* position in byte in the class attribute BootrapMethods.
	* @param hashCode
	* hashcode of the item. This hashcode is processed from the
	* hashcode of the bootstrap method and the hashcode of all
	* bootstrap arguments.
	*/
	void set(int position, int hashCode) {
	this.type = ClassWriter.BSM;
	this.intVal = position;
	this.hashCode = hashCode;
	}

	/**
	* Indicates if the given item is equal to this one. <i>This method assumes
	* that the two items have the same {@link #type}</i>.
	*
	* @param i
	* the item to be compared to this one. Both items must have the
	* same {@link #type}.
	* @return <tt>true</tt> if the given item if equal to this one,
	* <tt>false</tt> otherwise.
	*/
	boolean isEqualTo(final Item i) {
	switch (type) {
	case ClassWriter.UTF8:
	case ClassWriter.STR:
	case ClassWriter.CLASS:
	case ClassWriter.MTYPE:
	case ClassWriter.TYPE_NORMAL:
	return i.strVal1.equals(strVal1);
	case ClassWriter.TYPE_MERGED:
	case ClassWriter.LONG:
	case ClassWriter.DOUBLE:
	return i.longVal == longVal;
	case ClassWriter.INT:
	case ClassWriter.FLOAT:
	return i.intVal == intVal;
	case ClassWriter.TYPE_UNINIT:
	return i.intVal == intVal && i.strVal1.equals(strVal1);
	case ClassWriter.NAME_TYPE:
	return i.strVal1.equals(strVal1) && i.strVal2.equals(strVal2);
	case ClassWriter.INDY: {
	return i.longVal == longVal && i.strVal1.equals(strVal1)
	&& i.strVal2.equals(strVal2);
	}
	// case ClassWriter.FIELD:
	// case ClassWriter.METH:
	// case ClassWriter.IMETH:
	// case ClassWriter.HANDLE_BASE + 1..9
	default:
	return i.strVal1.equals(strVal1) && i.strVal2.equals(strVal2)
	&& i.strVal3.equals(strVal3);
	}
	}

	}

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