/*
* Portions Copyright 2000-2007 Sun Microsystems, Inc. All Rights
* Reserved. Use is subject to license terms.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
*
* This program 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.
*
* This program 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 at /legal/license.txt).
*
* 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 Sun Microsystems, Inc., 4150 Network Circle, Santa
* Clara, CA 95054 or visit www.sun.com if you need additional
* information or have any questions.
*/
package gov.nist.javax.sdp.parser;
import java.util.*;
import gov.nist.core.*;
/**
* Factory for creating parsers for the SDP stuff.
*
* @version JAIN-SIP-1.1
*
*
* <a href="{@docRoot}/uncopyright.html">This code is in the public domain.</a>
*/
public class ParserFactory {
/** Current parser table. */
private static Hashtable parserTable;
/** Parameters for instantiating the parser. */
private static Class[] constructorArgs;
/** the PArser classname. */
private static
final String packageName = "gov.nist.javax.sdp.parser";
/**
* Factory method to get the parser class.
* @param parserClass the name of the parser class.
* @return handle to parser engine
*/
private static Class getParser(String parserClass) {
try {
return Class.forName(packageName + "." + parserClass);
} catch (ClassNotFoundException ex) {
System.out.println("Could not find class");
ex.printStackTrace();
System.exit(0);
return null; // dummy
}
}
static {
constructorArgs = new Class[1];
constructorArgs[0] = new String().getClass();
parserTable = new Hashtable();
parserTable.put("a", getParser("AttributeFieldParser"));
parserTable.put("b", getParser("BandwidthFieldParser"));
parserTable.put("c", getParser("ConnectionFieldParser"));
parserTable.put("e", getParser("EmailFieldParser"));
parserTable.put("i", getParser("InformationFieldParser"));
parserTable.put("k", getParser("KeyFieldParser"));
parserTable.put("m", getParser("MediaFieldParser"));
parserTable.put("o", getParser("OriginFieldParser"));
parserTable.put("p", getParser("PhoneFieldParser"));
parserTable.put("v", getParser("ProtoVersionFieldParser"));
parserTable.put("r", getParser("RepeatFieldParser"));
parserTable.put("s", getParser("SessionNameFieldParser"));
parserTable.put("t", getParser("TimeFieldParser"));
parserTable.put("u", getParser("URIFieldParser"));
parserTable.put("z", getParser("ZoneFieldParser"));
}
/**
* Factory method to create a parser engine.
* @param field the name of the next field to parse
* @return the handle to the SDP parsing engine
*/
public static SDPParser
createParser(String field) throws ParseException {
String fieldName = Lexer.getFieldName(field);
if (fieldName == null)
return null;
Class parserClass =
(Class) parserTable.get(fieldName.toLowerCase());
if (parserClass != null) {
Exception ex = null;
try {
SDPParser retval = (SDPParser) parserClass.newInstance();
retval.setField(field);
return retval;
} catch (InstantiationException ie) {
ex = ie;
} catch (IllegalAccessException iae) {
ex = iae;
}
if (ex != null) {
// print system message and exit
InternalErrorHandler.handleException(ex);
return null;
}
} else
throw new ParseException
("Could not find parser for " + fieldName, 0);
}
}
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