com.talis.rdf.solr.DefaultDocumentBuilder.java Source code

Introduction

Here is the source code for com.talis.rdf.solr.DefaultDocumentBuilder.java

Source

/*
 *    Copyright 2011 Talis Systems Ltd
 * 
 *    Licensed under the Apache License, Version 2.0 (the "License");
 *    you may not use this file except in compliance with the License.
 *    You may obtain a copy of the License at
 * 
 *        http://www.apache.org/licenses/LICENSE-2.0
 * 
 *    Unless required by applicable law or agreed to in writing, software
 *    distributed under the License is distributed on an "AS IS" BASIS,
 *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *    See the License for the specific language governing permissions and
 *    limitations under the License.
 */

package com.talis.rdf.solr;

import static com.talis.rdf.solr.FieldNames.*;
import static org.apache.commons.lang.Validate.isTrue;
import static org.apache.commons.lang.Validate.notNull;

import java.util.Date;
import java.util.HashSet;

import org.apache.lucene.document.DateTools;
import org.apache.solr.common.SolrInputDocument;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.hp.hpl.jena.graph.Node;
import com.hp.hpl.jena.sparql.core.Quad;
import com.hp.hpl.jena.vocabulary.RDF;

public class DefaultDocumentBuilder implements SolrDocumentBuilder {

    private final static Logger LOG = LoggerFactory.getLogger(DefaultDocumentBuilder.class);

    @Override
    public SolrInputDocument getDocument(String subject, Iterable<Quad> quads) {
        LOG.debug("Creating SolrInputDocument for subject {}", subject);
        notNull(subject, "Subject URI cannot be null.");
        notNull(quads, "Quads cannot be null.");

        SolrInputDocument doc = new SolrInputDocument();
        doc.setField(INDEX_DATE, DateTools.dateToString(new Date(), DateTools.Resolution.SECOND));
        doc.setField(DOCUMENT_KEY, subject);
        doc.setField(SUBJECT_URI, subject);

        HashSet<String> graphUris = new HashSet<String>();

        for (Quad quad : quads) {
            LOG.debug("Processing quad {}", quad);

            graphUris.add(quad.getGraph().getURI());

            isTrue(quad.getSubject().getURI().equals(subject), "Subject URI not consistent with key");

            Node predicate = quad.getPredicate();
            Node object = quad.getObject();
            String predicateStr = predicate.getURI();
            if (predicateStr.equals(RDF.type.getURI()) && object.isURI()) {
                doc.addField(CLASS, object.getURI());
                doc.addField(CLASS_NS, object.getNameSpace());
            }

            doc.addField(PROPERTY, predicateStr);
            doc.addField(PROPERTY_NS, predicate.getNameSpace());

            if (object.isLiteral()) {
                doc.addField(predicateStr, object.getLiteralValue());
            }
        }
        for (String graphUri : graphUris) {
            doc.addField(GRAPH_URI, graphUri);
        }
        return doc;
    }

}