- /*
- * The Apache Software License, Version 1.1
- *
- *
- * Copyright (c) 1999,2000 The Apache Software Foundation. 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. The end-user documentation included with the redistribution,
- * if any, must include the following acknowledgment:
- * "This product includes software developed by the
- * Apache Software Foundation (http://www.apache.org/)."
- * Alternately, this acknowledgment may appear in the software itself,
- * if and wherever such third-party acknowledgments normally appear.
- *
- * 4. The names "Xerces" and "Apache Software Foundation" must
- * not be used to endorse or promote products derived from this
- * software without prior written permission. For written
- * permission, please contact apache@apache.org.
- *
- * 5. Products derived from this software may not be called "Apache",
- * nor may "Apache" appear in their name, without prior written
- * permission of the Apache Software Foundation.
- *
- * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED 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 APACHE SOFTWARE FOUNDATION OR
- * ITS 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.
- * ====================================================================
- *
- * This software consists of voluntary contributions made by many
- * individuals on behalf of the Apache Software Foundation and was
- * originally based on software copyright (c) 1999, International
- * Business Machines, Inc., http://www.apache.org. For more
- * information on the Apache Software Foundation, please see
- * <http://www.apache.org/>.
- */
-
- package org.apache.xml.dtm.ref;
- import java.util.Vector;
- import java.util.Hashtable;
-
- /** <p>CustomStringPool is an example of appliction provided data structure
- * for a DTM implementation to hold symbol references, e.g. elelment names.
- * It will follow the DTMDStringPool interface and use two simple methods
- * indexToString(int i) and stringToIndex(Sring 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.</p>
- * */
- public class CustomStringPool extends DTMStringPool {
- //final Vector m_intToString;
- //static final int HASHPRIME=101;
- //int[] m_hashStart=new int[HASHPRIME];
- final Hashtable m_stringToInt = new Hashtable();
- public static final int NULL=-1;
-
- public CustomStringPool()
- {
- super();
- /*m_intToString=new Vector();
- System.out.println("In constructor m_intToString is " +
- ((null == m_intToString) ? "null" : "not null"));*/
- //m_stringToInt=new Hashtable();
- //removeAllElements();
- }
-
- 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.
- * */
- 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. */
- public int stringToIndex(String s)
- {
- if (s==null) return NULL;
- Integer iobj=(Integer)m_stringToInt.get(s);
- if (iobj==null) {
- m_intToString.addElement(s);
- iobj=new Integer(m_intToString.size());
- m_stringToInt.put(s,iobj);
- }
- return iobj.intValue();
- }
- }