137 lines
4.3 KiB
Java
137 lines
4.3 KiB
Java
/*
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* Copyright (c) 2004, 2011, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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* THIS FILE WAS MODIFIED BY SUN MICROSYSTEMS, INC.
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*/
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package com.sun.xml.internal.fastinfoset.util;
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import com.sun.xml.internal.fastinfoset.CommonResourceBundle;
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public abstract class KeyIntMap {
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public static final int NOT_PRESENT = -1;
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/**
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* The default initial capacity - MUST be a power of two.
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*/
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static final int DEFAULT_INITIAL_CAPACITY = 16;
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/**
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* The maximum capacity, used if a higher value is implicitly specified
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* by either of the constructors with arguments.
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* MUST be a power of two <= 1<<30.
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*/
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static final int MAXIMUM_CAPACITY = 1 << 20;
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/**
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* The load factor used when none specified in constructor.
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**/
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static final float DEFAULT_LOAD_FACTOR = 0.75f;
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int _readOnlyMapSize;
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/**
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* The number of key-value mappings contained in this identity hash map.
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*/
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int _size;
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int _capacity;
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/**
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* The next size value at which to resize (capacity * load factor).
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*/
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int _threshold;
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/**
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* The load factor for the hash table.
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*/
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final float _loadFactor;
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static class BaseEntry {
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final int _hash;
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final int _value;
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public BaseEntry(int hash, int value) {
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_hash = hash;
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_value = value;
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}
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}
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public KeyIntMap(int initialCapacity, float loadFactor) {
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if (initialCapacity < 0)
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throw new IllegalArgumentException(CommonResourceBundle.getInstance().
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getString("message.illegalInitialCapacity", new Object[]{Integer.valueOf(initialCapacity)}));
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if (initialCapacity > MAXIMUM_CAPACITY)
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initialCapacity = MAXIMUM_CAPACITY;
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if (loadFactor <= 0 || Float.isNaN(loadFactor))
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throw new IllegalArgumentException(CommonResourceBundle.getInstance().
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getString("message.illegalLoadFactor", new Object[]{Float.valueOf(loadFactor)}));
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// Find a power of 2 >= initialCapacity
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if (initialCapacity != DEFAULT_INITIAL_CAPACITY) {
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_capacity = 1;
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while (_capacity < initialCapacity)
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_capacity <<= 1;
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_loadFactor = loadFactor;
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_threshold = (int)(_capacity * _loadFactor);
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} else {
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_capacity = DEFAULT_INITIAL_CAPACITY;
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_loadFactor = DEFAULT_LOAD_FACTOR;
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_threshold = (int)(DEFAULT_INITIAL_CAPACITY * DEFAULT_LOAD_FACTOR);
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}
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}
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public KeyIntMap(int initialCapacity) {
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this(initialCapacity, DEFAULT_LOAD_FACTOR);
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}
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public KeyIntMap() {
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_capacity = DEFAULT_INITIAL_CAPACITY;
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_loadFactor = DEFAULT_LOAD_FACTOR;
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_threshold = (int)(DEFAULT_INITIAL_CAPACITY * DEFAULT_LOAD_FACTOR);
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}
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public final int size() {
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return _size + _readOnlyMapSize;
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}
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public abstract void clear();
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public abstract void setReadOnlyMap(KeyIntMap readOnlyMap, boolean clear);
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public static final int hashHash(int h) {
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h += ~(h << 9);
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h ^= (h >>> 14);
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h += (h << 4);
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h ^= (h >>> 10);
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return h;
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}
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public static final int indexFor(int h, int length) {
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return h & (length-1);
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}
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}
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