owlsreaderimpl.java

开发owl的API,提供了W3C规定标准接口,是目前比较少的API.

// The MIT License
//
// Copyright (c) 2004 Evren Sirin
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to
// deal in the Software without restriction, including without limitation the
// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
// sell copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
// IN THE SOFTWARE.

/*
 * Created on Dec 27, 2003
 *
 */
package org.mindswap.owls.io.impl;

import java.net.URI;
import java.util.List;

import org.mindswap.owl.OWLFactory;
import org.mindswap.owl.OWLReader;
import org.mindswap.owls.io.*;
import org.mindswap.owls.io.OWLSReader;
import org.mindswap.owls.io.OWLSReaderListener;
import org.mindswap.owls.service.Service;

import com.hp.hpl.jena.rdf.arp.ParseException;
import com.hp.hpl.jena.rdf.model.Model;
import com.hp.hpl.jena.rdf.model.RDFErrorHandler;

/**
 * @author Evren Sirin
 *
 */
public abstract class OWLSReaderImpl implements OWLSReader {  
	protected OWLReader reader;
	protected String version;
	protected OWLSReaderListener listener;
	protected boolean errorOccurred = false;
	
	/**
	 * 
	 */
	public OWLSReaderImpl() {
		reader = OWLFactory.createOWLReader();
		
		listener = new OWLSReaderListenerQuiet();
	}
	
	public Service read(URI fileURI) throws Exception {
		List services = readAll(fileURI);
		if(services == null || services.isEmpty())
			return null;

		
		
		for(int i = 0; i < services.size(); i++) {
			Service s = (Service) services.get(i);
			if(s.getURI().toString().startsWith(fileURI.toString()))
				return s;
		}
		
		return (Service) services.get(0);
	}	
	
	/* (non-Javadoc)
	 * @see org.mindswap.OWLS_0_9.parser.Parser#parse(java.lang.String)
	 */
	public List readAll(URI fileURI) throws Exception {
		reader.setErrorHandler(new RDFErrorHandler() {
			public void warning(Exception e) {
				OWLSReaderImpl.this.warning(ParseException.formatMessage(e));
			}

			public void error(Exception e) {
				OWLSReaderImpl.this.warning(ParseException.formatMessage(e));			
			}

			public void fatalError(Exception e) {
				OWLSReaderImpl.this.error(ParseException.formatMessage(e));	
				throw e instanceof RuntimeException 
				? (RuntimeException) e
				: new RuntimeException( e );				
			}				
		});
		
		Model model = reader.read(fileURI);
			
		List list = createService(fileURI, model);

		return list;
	}
	
	public void setListener(OWLSReaderListener listener) {
		this.listener = listener;
	}
	
	protected void startService(String serviceURI) {
		if(listener != null)
			listener.startService(serviceURI);
		errorOccurred = false;
	}
	
	protected void finishService(String serviceURI) {
		if(listener != null)
			listener.finishService(serviceURI);
	}
	
	protected void warning(String msg) {
		if(listener != null)
			listener.warning(msg);
	}
	
	protected void error(String msg) {
		if(listener != null)
			listener.error(msg);
		errorOccurred = true;
	}	
	
	protected abstract List createService(URI fileURI, Model model);		
}