mirceatoma 2002/12/06 14:11:05
Added: xmlutil/src/java/org/apache/excalibur/xmlizer
DefaultXMLizer.java
Log:
Moved from ./impl directory.
Renamed from XMLizerImpl.
Refactored implementation to select an appropriate
Parser based on the content mime type.
Revision Changes Path
1.1
jakarta-avalon-excalibur/xmlutil/src/java/org/apache/excalibur/xmlizer/DefaultXMLizer.java
Index: DefaultXMLizer.java
===================================================================
/*
* Copyright (C) The Apache Software Foundation. All rights reserved.
*
* This software is published under the terms of the Apache Software License
* version 1.1, a copy of which has been included with this distribution in
* the LICENSE.txt file.
*/
package org.apache.excalibur.xmlizer;
import org.apache.avalon.framework.component.Component;
import org.apache.avalon.framework.configuration.Configurable;
import org.apache.avalon.framework.configuration.Configuration;
import org.apache.avalon.framework.configuration.ConfigurationException;
import org.apache.avalon.framework.logger.AbstractLogEnabled;
import org.apache.avalon.framework.service.ServiceException;
import org.apache.avalon.framework.service.ServiceManager;
import org.apache.avalon.framework.service.Serviceable;
import org.apache.avalon.framework.thread.ThreadSafe;
import org.apache.excalibur.xml.sax.Parser;
import org.xml.sax.ContentHandler;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import java.io.IOException;
import java.io.InputStream;
import java.util.HashMap;
import java.util.Map;
/**
* Converter for transforming any input stream with a given mime-type
* into SAX events.
* This component acts like a selector. All XMLizer can "register"
* themselfes for a given mime-type and this component forwards
* the transformation to the registered on.
*
* @author <a href="mailto:[EMAIL PROTECTED]">Carsten Ziegeler</a>
* @version CVS $Revision: 1.1 $ $Date: 2002/12/06 22:11:05 $
*/
public final class DefaultXMLizer extends AbstractLogEnabled
implements XMLizer, Serviceable, Configurable, ThreadSafe, Component
{
private ServiceManager m_serviceManager;
private Map m_mimeTypes = new HashMap();
public void service( ServiceManager serviceManager ) throws
ServiceException
{
m_serviceManager = serviceManager;
}
public void configure( Configuration configuration ) throws
ConfigurationException
{
final Configuration[] parsers = configuration.getChildren("parser");
for ( int i = 0; i < parsers.length; i++ )
{
final Configuration parser = parsers[i];
final String mimeType = parser.getAttribute("mime-type");
final String role = parser.getAttribute("parser");
m_mimeTypes.put(mimeType, role);
}
}
/**
* Generates SAX events from the given input stream
* @param stream the data
* @param mimeType the mime-type for the data
* @param systemID the URI defining the data (this is optional and can
be null)
*/
public void toSAX( final InputStream stream,
final String mimeType,
final String systemID,
final ContentHandler handler )
throws SAXException, IOException
{
if ( null == stream )
{
throw new NullPointerException( "stream" );
}
if ( null == handler )
{
throw new NullPointerException( "handler" );
}
final String parserRole;
if ( m_mimeTypes.containsKey(mimeType) )
{
parserRole = (String) m_mimeTypes.get(mimeType);
}
else
{
if ( getLogger().isDebugEnabled() )
{
final String message = "No mime-type for xmlizing " +
systemID +
", guessing text/xml";
getLogger().debug( message );
}
parserRole = Parser.ROLE;
}
try
{
final Parser parser = (Parser) m_serviceManager.lookup(
parserRole );
final InputSource inputSource = new InputSource( stream );
inputSource.setSystemId( systemID );
parser.parse( inputSource, handler, null );
}
catch ( ServiceException e )
{
throw new SAXException( "Cannot parse content of type" + mimeType
);
}
}
}
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