1 /*
   2  * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package com.sun.xml.internal.messaging.saaj.util;
  27 
  28 
  29 import org.xml.sax.SAXException;
  30 import java.util.concurrent.ArrayBlockingQueue;
  31 import java.util.concurrent.BlockingQueue;
  32 import javax.xml.parsers.ParserConfigurationException;
  33 import javax.xml.parsers.SAXParser;
  34 import javax.xml.parsers.SAXParserFactory;
  35 import org.xml.sax.SAXNotRecognizedException;
  36 import org.xml.sax.SAXNotSupportedException;
  37 
  38 
  39 /**
  40  * Pool of SAXParser objects
  41  */
  42 public class ParserPool {
  43     private final BlockingQueue queue;
  44     private SAXParserFactory factory;
  45     private int capacity;
  46 
  47     public ParserPool(int capacity) {
  48         this.capacity = capacity;
  49         queue = new ArrayBlockingQueue(capacity);
  50         //factory = SAXParserFactory.newInstance();
  51         factory = new com.sun.org.apache.xerces.internal.jaxp.SAXParserFactoryImpl();
  52         factory.setNamespaceAware(true);
  53         for (int i=0; i < capacity; i++) {
  54            try {
  55                 queue.put(factory.newSAXParser());
  56             } catch (InterruptedException ex) {
  57                 Thread.currentThread().interrupt();
  58                 throw new RuntimeException(ex);
  59             } catch (ParserConfigurationException ex) {
  60                 throw new RuntimeException(ex);
  61             } catch (SAXException ex) {
  62                 throw new RuntimeException(ex);
  63             }
  64         }
  65     }
  66 
  67     public SAXParser get() throws ParserConfigurationException,
  68                 SAXException {
  69 
  70         try {
  71             return (SAXParser) queue.take();
  72         } catch (InterruptedException ex) {
  73             throw new SAXException(ex);
  74         }
  75 
  76     }
  77 
  78     public void put(SAXParser parser) {
  79         queue.offer(parser);
  80     }
  81 
  82     public void returnParser(SAXParser saxParser) {
  83         saxParser.reset();
  84         resetSaxParser(saxParser);
  85         put(saxParser);
  86     }
  87 
  88 
  89     /**
  90      * SAAJ Issue 46 :https://saaj.dev.java.net/issues/show_bug.cgi?id=46
  91      * Xerces does not provide a way to reset the SymbolTable
  92      * So we are trying to reset it using the proprietary code below.
  93      * Temporary Until the bug : https://jaxp.dev.java.net/issues/show_bug.cgi?id=59
  94      * is fixed.
  95      * @param parser the parser from the pool whose Symbol Table needs to be reset.
  96      */
  97      private void resetSaxParser(SAXParser parser) {
  98         try {
  99             //Object obj = parser.getProperty("http://apache.org/xml/properties/internal/symbol-table");
 100             com.sun.org.apache.xerces.internal.util.SymbolTable table = new com.sun.org.apache.xerces.internal.util.SymbolTable();
 101             parser.setProperty("http://apache.org/xml/properties/internal/symbol-table", table);
 102             //obj = parser.getProperty("http://apache.org/xml/properties/internal/symbol-table");
 103         } catch (SAXNotRecognizedException ex) {
 104             //nothing to do
 105         } catch (SAXNotSupportedException ex) {
 106             //nothing to do
 107         }
 108     }
 109 
 110 }