| /* |
| * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. |
| * 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. |
| */ |
| /* |
| * Copyright (C) 2004-2011 |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining a copy |
| * of this software and associated documentation files (the "Software"), to deal |
| * in the Software without restriction, including without limitation the rights |
| * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| * copies of the Software, and to permit persons to whom the Software is |
| * furnished to do so, subject to the following conditions: |
| * |
| * The above copyright notice and this permission notice shall be included in |
| * all copies or substantial portions of the Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
| * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
| * THE SOFTWARE. |
| */ |
| package com.sun.xml.internal.rngom.binary; |
| |
| final class PatternInterner { |
| private static final int INIT_SIZE = 256; |
| private static final float LOAD_FACTOR = 0.3f; |
| private Pattern[] table; |
| private int used; |
| private int usedLimit; |
| |
| PatternInterner() { |
| table = null; |
| used = 0; |
| usedLimit = 0; |
| } |
| |
| PatternInterner(PatternInterner parent) { |
| table = parent.table; |
| if (table != null) |
| table = (Pattern[]) table.clone(); |
| used = parent.used; |
| usedLimit = parent.usedLimit; |
| } |
| |
| @SuppressWarnings("empty-statement") |
| Pattern intern(Pattern p) { |
| int h; |
| |
| if (table == null) { |
| table = new Pattern[INIT_SIZE]; |
| usedLimit = (int) (INIT_SIZE * LOAD_FACTOR); |
| h = firstIndex(p); |
| } else { |
| for (h = firstIndex(p); table[h] != null; h = nextIndex(h)) { |
| if (p.samePattern(table[h])) |
| return table[h]; |
| } |
| } |
| if (used >= usedLimit) { |
| // rehash |
| Pattern[] oldTable = table; |
| table = new Pattern[table.length << 1]; |
| for (int i = oldTable.length; i > 0;) { |
| --i; |
| if (oldTable[i] != null) { |
| int j; |
| for (j = firstIndex(oldTable[i]); |
| table[j] != null; |
| j = nextIndex(j)); |
| table[j] = oldTable[i]; |
| } |
| } |
| for (h = firstIndex(p); table[h] != null; h = nextIndex(h)); |
| usedLimit = (int) (table.length * LOAD_FACTOR); |
| } |
| used++; |
| table[h] = p; |
| return p; |
| } |
| |
| private int firstIndex(Pattern p) { |
| return p.patternHashCode() & (table.length - 1); |
| } |
| |
| private int nextIndex(int i) { |
| return i == 0 ? table.length - 1 : i - 1; |
| } |
| } |