/*
 * Copyright (c) 2005, 2006, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */



package com.sun.xml.internal.messaging.saaj.util;

import java.util.EmptyStackException;
import java.util.Stack;

import javax.xml.parsers.*;

import org.xml.sax.SAXException;

/**
 * Pool of SAXParser objects
 */
public class ParserPool {
    private Stack parsers;
    private SAXParserFactory factory;
    private int capacity;

    public ParserPool(int capacity) {
		this.capacity = capacity;
        factory = new com.sun.org.apache.xerces.internal.jaxp.SAXParserFactoryImpl(); //SAXParserFactory.newInstance();
        factory.setNamespaceAware(true);
        parsers = new Stack();
    }

    public synchronized SAXParser get() throws ParserConfigurationException,
		SAXException {

        try {
            return (SAXParser) parsers.pop();
        } catch (EmptyStackException e) {
            return factory.newSAXParser();
        }
    }

    public synchronized void put(SAXParser parser) {
        if (parsers.size() < capacity) {
            parsers.push(parser);
        }
    }

}