ControlInformation.java

/**
 * File: $HeadURL: https://hdt-java.googlecode.com/svn/trunk/hdt-java/src/org/rdfhdt/hdt/options/ControlInformation.java $
 * Revision: $Rev: 191 $
 * Last modified: $Date: 2013-03-03 11:41:43 +0000 (dom, 03 mar 2013) $
 * Last modified by: $Author: mario.arias $
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * Contacting the authors:
 *   Mario Arias:               mario.arias@deri.org
 *   Javier D. Fernandez:       jfergar@infor.uva.es
 *   Miguel A. Martinez-Prieto: migumar2@infor.uva.es
 *   Alejandro Andres:          fuzzy.alej@gmail.com
 */

package org.rdfhdt.hdt.options;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Enumeration;

import org.rdfhdt.hdt.exceptions.IllegalFormatException;
import org.rdfhdt.hdt.util.crc.CRC16;
import org.rdfhdt.hdt.util.crc.CRCInputStream;
import org.rdfhdt.hdt.util.crc.CRCOutputStream;
import org.rdfhdt.hdt.util.io.IOUtil;

/**
 * @author mario.arias
 *
 */
public class ControlInformation extends HDTOptionsBase implements ControlInfo {
	
	ControlInfo.Type type;
	String format;
	
	public ControlInformation() {
		super();
	}	
	
	public ControlInfo.Type getType() {
		return type;
	}
	
	public void setType(ControlInfo.Type type) {
		this.type = type;
	}
	
	public String getFormat() {
		return format;
	}

	public void setFormat(String format) {
		this.format = format;
	}

	public void save(OutputStream output) throws IOException {
		CRCOutputStream out = new CRCOutputStream(output, new CRC16());
		
		// Cookie
		IOUtil.writeString(out, "$HDT");
		
		// Type
		IOUtil.writeByte(out, (byte)type.ordinal());
		
		// Format
		IOUtil.writeString(out, format);
		out.write(0);
		
		// Properties
		for (Enumeration<Object> e = properties.keys(); e.hasMoreElements();) {
			String key = (String) e.nextElement();
			
			IOUtil.writeString(out, key+'='+properties.getProperty(key)+";");
		}
		out.write(0); // Null terminator
		
		// CRC
		out.writeCRC();
	}
	
	public void load(InputStream input) throws IOException {
		CRCInputStream in = new CRCInputStream(input, new CRC16());
       
		// Cookie
        String magic = IOUtil.readChars(in, 4);
        if(!magic.equals("$HDT")) {
        	 throw new IOException("Non-HDT Section");
        }
        
        // Type
        try {
        	type = Type.values()[IOUtil.readByte(in)];
        } catch (ArrayIndexOutOfBoundsException e) {
        	throw new IllegalFormatException("The type of the ControlInformation is unknown for this implementation");
        }

        // Format
        format = IOUtil.readLine(in, '\0');
        
        // Properties
        String propertiesStr = IOUtil.readLine(in, '\0');   
        for(String item : propertiesStr.split(";")) {
        	int pos = item.indexOf('=');
        	if(pos!=-1) {
        		String property = item.substring(0, pos);
        		String value = item.substring(pos+1);
        		properties.put(property, value);
        	}
        }
        
        // CRC
        in.readCRCAndCheck();
	}
	
	@Override
	public void clear() {
		type = Type.UNKNOWN;
		format = null;
		super.clear();
	}
}