PostcodeAnalyser.java

/**
 * 
 */
package uk.bl.wa.analyser.text;

/*
 * #%L
 * warc-indexer
 * %%
 * Copyright (C) 2013 - 2014 The UK Web Archive
 * %%
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as
 * published by the Free Software Foundation, either version 2 of the
 * License, or (at your option) any later version.
 * 
 * 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 for more details.
 * 
 * You should have received a copy of the GNU General Public
 * License along with this program.  If not, see
 * <http://www.gnu.org/licenses/gpl-2.0.html>.
 * #L%
 */

import java.util.HashSet;
import java.util.Set;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import com.typesafe.config.Config;

import uk.bl.wa.extract.PostcodeGeomapper;
import uk.bl.wa.solr.SolrFields;
import uk.bl.wa.solr.SolrRecord;
import uk.bl.wa.util.Instrument;

/**
 * @author anj
 *
 */
public class PostcodeAnalyser extends AbstractTextAnalyser {

	private static final Pattern postcodePattern = Pattern.compile( "[A-Z]{1,2}[0-9R][0-9A-Z]? [0-9][ABD-HJLNP-UW-Z]{2}" );

	/** */
	private PostcodeGeomapper pcg = new PostcodeGeomapper();
	
	/**
	 * @param conf
	 */
	public PostcodeAnalyser(Config conf) {
	}

	/* (non-Javadoc)
	 * @see uk.bl.wa.analyser.text.TextAnalyser#analyse(java.lang.String, uk.bl.wa.util.solr.SolrRecord)
	 */
	@Override
	public void analyse(String text, SolrRecord solr) {
        final long start = System.nanoTime();
		// Postcode Extractor (based on text extracted by Tika)
		Matcher pcm = postcodePattern.matcher( text );
		Set<String> pcs = new HashSet<String>();
		while( pcm.find() )
			pcs.add( pcm.group() );
		for( String pc : pcs ) {
			solr.addField( SolrFields.POSTCODE, pc );
			String pcd = pc.substring( 0, pc.lastIndexOf( " " ) );
			solr.addField( SolrFields.POSTCODE_DISTRICT, pcd );
			String location = pcg.getLatLogForPostcodeDistrict( pcd );
			if( location != null )
				solr.addField( SolrFields.LOCATIONS, location );
		}
        Instrument.timeRel("TextAnalyzers#total", "PostcodeAnalyzer", start);
	}

}