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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.    
 */
package org.apache.xmlrpc.util;

import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParserFactory;

import org.apache.xmlrpc.XmlRpcException;
import org.xml.sax.SAXException;
import org.xml.sax.XMLReader;


/** Utility class for working with SAX parsers.
 */
public class SAXParsers {
	private static SAXParserFactory spf;
	static {
		spf = SAXParserFactory.newInstance();
		spf.setNamespaceAware(true);
		spf.setValidating(false);
		try {
		    spf.setFeature("http://xml.org/sax/features/external-general-entities", false);
		} catch (javax.xml.parsers.ParserConfigurationException e) {
		    // Ignore it
        } catch (org.xml.sax.SAXException e) {
            // Ignore it
		}
		try {
		    spf.setFeature("http://xml.org/sax/features/external-parameter-entities", false);
        } catch (javax.xml.parsers.ParserConfigurationException e) {
            // Ignore it
        } catch (org.xml.sax.SAXException e) {
            // Ignore it
		}
        try {
            spf.setFeature("http://apache.org/xml/features/nonvalidating/load-external-dtd", false);
        } catch (javax.xml.parsers.ParserConfigurationException e) {
            // Ignore it
        } catch (org.xml.sax.SAXException e) {
            // Ignore it
        }
	}

	/** Creates a new instance of {@link XMLReader}.
	 *
	 * @return the XML Reader
	 * @throws XmlRpcException if the XML Reader cannot be created
	 */
	public static XMLReader newXMLReader() throws XmlRpcException {
		try {
			return spf.newSAXParser().getXMLReader();
		} catch (ParserConfigurationException e) {
			throw new XmlRpcException("Unable to create XML parser: " + e.getMessage(), e);
		} catch (SAXException e) {
			throw new XmlRpcException("Unable to create XML parser: " + e.getMessage(), e);
		}
	}

	/**
	 * Returns the SAX parser factory, which is used by Apache XML-RPC. You may
	 * use this to configure the factory.
	 *
	 * @return the SAX parser factory
	 */
	public static SAXParserFactory getSAXParserFactory() {
	    return spf;
	}

	/**
     * Sets the SAX parser factory, which is used by Apache XML-RPC. You may use
     * this to configure another instance than the default.
	 *
	 * @param pFactory the SAX parser factory
     */
	public static void setSAXParserFactory(SAXParserFactory pFactory) {
        spf = pFactory;
    }
}