Source Code Cross Referenced for CustomStringPool.java in  » XML » xalan » org » apache » xml » dtm » ref » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » XML » xalan » org.apache.xml.dtm.ref 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


01:        /*
02:         * Copyright 1999-2004 The Apache Software Foundation.
03:         *
04:         * Licensed under the Apache License, Version 2.0 (the "License");
05:         * you may not use this file except in compliance with the License.
06:         * You may obtain a copy of the License at
07:         *
08:         *     http://www.apache.org/licenses/LICENSE-2.0
09:         *
10:         * Unless required by applicable law or agreed to in writing, software
11:         * distributed under the License is distributed on an "AS IS" BASIS,
12:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13:         * See the License for the specific language governing permissions and
14:         * limitations under the License.
15:         */
16:        /*
17:         * $Id: CustomStringPool.java,v 1.5 2004/02/16 23:06:11 minchau Exp $
18:         */
19:
20:        package org.apache.xml.dtm.ref;
21:
22:        import java.util.Hashtable;
23:
24:        /** <p>CustomStringPool is an example of appliction provided data structure
25:         * for a DTM implementation to hold symbol references, e.g. elelment names.
26:         * It will follow the DTMDStringPool interface and use two simple methods
27:         * indexToString(int i) and stringToIndex(Sring s) to map between a set of
28:         * string values and a set of integer index values.  Therefore, an application
29:         * may improve DTM processing speed by substituting the DTM symbol resolution
30:         * tables with application specific quick symbol resolution tables.</p>
31:         *
32:         * %REVIEW% The only difference between this an DTMStringPool seems to be that
33:         * it uses a java.lang.Hashtable full of Integers rather than implementing its
34:         * own hashing. Joe deliberately avoided that approach when writing
35:         * DTMStringPool, since it is both much more memory-hungry and probably slower
36:         * -- especially in JDK 1.1.x, where Hashtable is synchronized. We need to
37:         * either justify this implementation or discard it.
38:         *
39:         * <p>Status: In progress, under discussion.</p>
40:         * */
41:        public class CustomStringPool extends DTMStringPool {
42:            //final Vector m_intToString;
43:            //static final int HASHPRIME=101;
44:            //int[] m_hashStart=new int[HASHPRIME];
45:            final Hashtable m_stringToInt = new Hashtable();
46:            public static final int NULL = -1;
47:
48:            public CustomStringPool() {
49:                super ();
50:                /*m_intToString=new Vector();
51:                System.out.println("In constructor m_intToString is " + 
52:                                                                                         ((null == m_intToString) ? "null" : "not null"));*/
53:                //m_stringToInt=new Hashtable();
54:                //removeAllElements();
55:            }
56:
57:            public void removeAllElements() {
58:                m_intToString.removeAllElements();
59:                if (m_stringToInt != null)
60:                    m_stringToInt.clear();
61:            }
62:
63:            /** @return string whose value is uniquely identified by this integer index.
64:             * @throws java.lang.ArrayIndexOutOfBoundsException
65:             *  if index doesn't map to a string.
66:             * */
67:            public String indexToString(int i)
68:                    throws java.lang.ArrayIndexOutOfBoundsException {
69:                return (String) m_intToString.elementAt(i);
70:            }
71:
72:            /** @return integer index uniquely identifying the value of this string. */
73:            public int stringToIndex(String s) {
74:                if (s == null)
75:                    return NULL;
76:                Integer iobj = (Integer) m_stringToInt.get(s);
77:                if (iobj == null) {
78:                    m_intToString.addElement(s);
79:                    iobj = new Integer(m_intToString.size());
80:                    m_stringToInt.put(s, iobj);
81:                }
82:                return iobj.intValue();
83:            }
84:        }
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