package at.gv.egovernment.moa.util; import java.io.IOException; import java.io.InputStream; import java.util.Map; import org.xml.sax.EntityResolver; import org.xml.sax.InputSource; import org.xml.sax.SAXException; /** * An EntityResolver that maps system IDs to * InputStreams. * * @author Patrick Peck * @version $Id$ */ public class StreamEntityResolver implements EntityResolver { /** A mapping from Public ID or System ID to an InputStream * containing the entity. */ private Map mappedEntities; /** * Create a StreamEntityResolver. * * @param mappedEntities A mapping from public or system IDs * (String objects) to InputStreams. */ public StreamEntityResolver(Map mappedEntities) { this.mappedEntities = mappedEntities; } /** * Resolve an entity by looking it up in the mapped entities. * * First, the public ID is looked up in the mapping, then the system ID. * * @param publicId The public ID of the entity. * @param systemId The system ID of the entity. * @return An InputStream containing the entity or * null if no entity could be found. * @throws SAXException Signalling a parsing exception. * @throws IOException Error reading the entity. */ public InputSource resolveEntity(String publicId, String systemId) throws SAXException, IOException { InputSource src = null; if (publicId != null && mappedEntities.get(publicId) != null) { src = new InputSource((InputStream) mappedEntities.get(publicId)); } else if (systemId != null && mappedEntities.get(systemId) != null) { src = new InputSource((InputStream) mappedEntities.get(systemId)); } if (src != null) { src.setPublicId(publicId); src.setSystemId(systemId); } return src; } }