| /* |
| * Copyright (c) 2015, 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. |
| */ |
| /* |
| * $Id: CustomStringPool.java,v 1.2.4.1 2005/09/15 08:14:59 suresh_emailid Exp $ |
| */ |
| package com.sun.org.apache.xml.internal.dtm.ref; |
| |
| import java.util.HashMap; |
| import java.util.Map; |
| |
| /** |
| * CustomStringPool is an example of an application-provided data structure for a |
| * DTM implementation to hold symbol references, e.g. element names. It will |
| * follow the DTMStringPool interface and use two simple methods |
| * indexToString(int i) and stringToIndex(String s) to map between a set of |
| * string values and a set of integer index values. Therefore, an application |
| * may improve DTM processing speed by substituting the DTM symbol resolution |
| * tables with application specific quick symbol resolution tables. |
| * <p> |
| * %REVIEW% The only difference between this an DTMStringPool seems to be that |
| * it uses a java.lang.Hashtable full of Integers rather than implementing its |
| * own hashing. Joe deliberately avoided that approach when writing |
| * DTMStringPool, since it is both much more memory-hungry and probably slower |
| * -- especially in JDK 1.1.x, where Hashtable is synchronized. We need to |
| * either justify this implementation or discard it. |
| * |
| * <p> |
| * Status: In progress, under discussion. |
| * |
| */ |
| public class CustomStringPool extends DTMStringPool { |
| |
| final Map<String, Integer> m_stringToInt = new HashMap<>(); |
| public static final int NULL = -1; |
| |
| public CustomStringPool() { |
| super(); |
| } |
| |
| public void removeAllElements() { |
| m_intToString.removeAllElements(); |
| if (m_stringToInt != null) { |
| m_stringToInt.clear(); |
| } |
| } |
| |
| /** |
| * @return string whose value is uniquely identified by this integer index. |
| * @throws java.lang.ArrayIndexOutOfBoundsException if index doesn't map to |
| * a string. |
| */ |
| @Override |
| public String indexToString(int i) |
| throws java.lang.ArrayIndexOutOfBoundsException { |
| return (String) m_intToString.elementAt(i); |
| } |
| |
| /** |
| * @return integer index uniquely identifying the value of this string. |
| */ |
| @Override |
| public int stringToIndex(String s) { |
| if (s == null) { |
| return NULL; |
| } |
| Integer iobj = m_stringToInt.get(s); |
| if (iobj == null) { |
| m_intToString.addElement(s); |
| iobj = m_intToString.size(); |
| m_stringToInt.put(s, iobj); |
| } |
| return iobj; |
| } |
| } |