001: /*
002: * ParserFactory.java
003: *
004: *
005: * Copyright (c) 2003 Rimfaxe ApS (www.rimfaxe.com).
006: * All rights reserved.
007: *
008: * This package is written by Lars Andersen <lars@rimfaxe.com>
009: * and licensed by Rimfaxe ApS.
010: *
011: * Redistribution and use in source and binary forms, with or without
012: * modification, are permitted provided that the following conditions
013: * are met:
014: *
015: * 1. Redistributions of source code must retain the above copyright
016: * notice, this list of conditions and the following disclaimer.
017: *
018: * 2. Redistributions in binary form must reproduce the above copyright
019: * notice, this list of conditions and the following disclaimer in
020: * the documentation and/or other materials provided with the
021: * distribution.
022: *
023: * 3. The end-user documentation included with the redistribution, if
024: * any, must include the following acknowlegement:
025: * "This product includes software developed by Rimfaxe ApS
026: (www.rimfaxe.com)"
027: * Alternately, this acknowlegement may appear in the software itself,
028: * if and wherever such third-party acknowlegements normally appear.
029: *
030: * 4. The names "Rimfaxe", "Rimfaxe Software", "Lars Andersen" and
031: * "Rimfaxe WebServer" must not be used to endorse or promote products
032: * derived from this software without prior written permission. For written
033: * permission, please contact info@rimfaxe.com
034: *
035: * 5. Products derived from this software may not be called "Rimfaxe"
036: * nor may "Rimfaxe" appear in their names without prior written
037: * permission of the Rimfaxe ApS.
038: *
039: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
040: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
041: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
042: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
043: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
044: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
045: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
046: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
047: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
048: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
049: * SUCH DAMAGE.
050: *
051: */
052:
053: package com.rimfaxe.xml;
054:
055: import java.util.*;
056:
057: /**
058: *
059: * @author Lars Andersen
060: */
061: public class ParserFactory {
062: static ParserFactory instance = null;
063:
064: boolean xerces = false;
065:
066: Vector rep = new Vector();
067:
068: /** Creates a new instance of ParserFactory */
069: public ParserFactory() {
070: // Check if xerces xml parser is present...
071: try {
072: Class.forName("org.apache.xerces.parsers.DOMParser");
073: xerces = true;
074: //System.out.println("Xerces is present");
075: } catch (ClassNotFoundException ce) {
076: xerces = false;
077: //System.out.println("Xerces is absent");
078: }
079: }
080:
081: public synchronized static ParserFactory getInstance() {
082: if (instance == null) {
083: instance = new ParserFactory();
084: }
085: return instance;
086: }
087:
088: public ParserInterface checkoutParser() {
089: if (rep.size() > 0) {
090: ParserInterface pi = (ParserInterface) rep.remove(0);
091: return pi;
092: } else {
093: build(3);
094: ParserInterface pi = (ParserInterface) rep.remove(0);
095: return pi;
096: }
097: }
098:
099: public void checkinParser(ParserInterface pi) {
100: rep.addElement(pi);
101: }
102:
103: public void build(int n) {
104: for (int i = 0; i < n; i++) {
105: if (xerces) {
106: try {
107: ParserInterface p = (ParserInterface) Class
108: .forName("com.rimfaxe.xml.XercesParser")
109: .newInstance();
110: //XercesParser p = new XercesParser();
111: rep.addElement(p);
112: } catch (Exception e) {
113: }
114: } else {
115: XMLParser p = new XMLParser();
116: rep.addElement(p);
117: }
118: }
119: }
120: }
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