2.4/dev/core/src/com/google/gwt/dev/asm/Item.java - gwt - Git at Google

 /***
  * ASM: a very small and fast Java bytecode manipulation framework
  * Copyright (c) 2000-2007 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 com.google.gwt.dev.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}.
      *
      * 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.UTF8:
             case ClassWriter.STR:
             case ClassWriter.CLASS:
             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:
             default:
                 hashCode = 0x7FFFFFFF & (type + strVal1.hashCode()
                         * strVal2.hashCode() * strVal3.hashCode());
         }
     }

     /**
      * Indicates if the given item is equal to this one.
      *
      * @param i the item to be compared to this one.
      * @return <tt>true</tt> if the given item if equal to this one,
      *         <tt>false</tt> otherwise.
      */
     boolean isEqualTo(final Item i) {
         if (i.type == type) {
             switch (type) {
                 case ClassWriter.INT:
                 case ClassWriter.FLOAT:
                     return i.intVal == intVal;
                 case ClassWriter.TYPE_MERGED:
                 case ClassWriter.LONG:
                 case ClassWriter.DOUBLE:
                     return i.longVal == longVal;
                 case ClassWriter.UTF8:
                 case ClassWriter.STR:
                 case ClassWriter.CLASS:
                 case ClassWriter.TYPE_NORMAL:
                     return i.strVal1.equals(strVal1);
                 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);
                     // ClassWriter.FIELD:
                     // ClassWriter.METH:
                     // ClassWriter.IMETH:
                 default:
                     return i.strVal1.equals(strVal1)
                             && i.strVal2.equals(strVal2)
                             && i.strVal3.equals(strVal3);
             }
         }
         return false;
     }
 }
	/***
	* ASM: a very small and fast Java bytecode manipulation framework
	* Copyright (c) 2000-2007 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 com.google.gwt.dev.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}.
	*
	* 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.UTF8:
	case ClassWriter.STR:
	case ClassWriter.CLASS:
	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:
	default:
	hashCode = 0x7FFFFFFF & (type + strVal1.hashCode()
	* strVal2.hashCode() * strVal3.hashCode());
	}
	}

	/**
	* Indicates if the given item is equal to this one.
	*
	* @param i the item to be compared to this one.
	* @return <tt>true</tt> if the given item if equal to this one,
	* <tt>false</tt> otherwise.
	*/
	boolean isEqualTo(final Item i) {
	if (i.type == type) {
	switch (type) {
	case ClassWriter.INT:
	case ClassWriter.FLOAT:
	return i.intVal == intVal;
	case ClassWriter.TYPE_MERGED:
	case ClassWriter.LONG:
	case ClassWriter.DOUBLE:
	return i.longVal == longVal;
	case ClassWriter.UTF8:
	case ClassWriter.STR:
	case ClassWriter.CLASS:
	case ClassWriter.TYPE_NORMAL:
	return i.strVal1.equals(strVal1);
	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);
	// ClassWriter.FIELD:
	// ClassWriter.METH:
	// ClassWriter.IMETH:
	default:
	return i.strVal1.equals(strVal1)
	&& i.strVal2.equals(strVal2)
	&& i.strVal3.equals(strVal3);
	}
	}
	return false;
	}
	}