org.hibernate.search.backend.impl.lucene.works.DeleteWorkDelegate.java Source code

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Here is the source code for org.hibernate.search.backend.impl.lucene.works.DeleteWorkDelegate.java

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/*
 * Hibernate, Relational Persistence for Idiomatic Java
 *
 * Copyright (c) 2010, Red Hat, Inc. and/or its affiliates or third-party contributors as
 * indicated by the @author tags or express copyright attribution
 * statements applied by the authors.  All third-party contributions are
 * distributed under license by Red Hat, Inc.
 *
 * This copyrighted material is made available to anyone wishing to use, modify,
 * copy, or redistribute it subject to the terms and conditions of the GNU
 * Lesser General Public License, as published by the Free Software Foundation.
 *
 * 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 Lesser General Public License
 * for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this distribution; if not, write to:
 * Free Software Foundation, Inc.
 * 51 Franklin Street, Fifth Floor
 * Boston, MA  02110-1301  USA
 */
package org.hibernate.search.backend.impl.lucene.works;

import java.io.Serializable;

import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.index.Term;
import org.apache.lucene.search.BooleanClause;
import org.apache.lucene.search.BooleanQuery;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.TermQuery;
import org.hibernate.search.bridge.TwoWayFieldBridge;
import org.hibernate.search.bridge.builtin.NumericFieldBridge;
import org.hibernate.search.bridge.util.impl.NumericFieldUtils;
import org.hibernate.search.engine.spi.DocumentBuilderIndexedEntity;
import org.hibernate.search.store.Workspace;
import org.hibernate.search.util.logging.impl.Log;

import org.hibernate.search.SearchException;
import org.hibernate.search.backend.LuceneWork;
import org.hibernate.search.batchindexing.MassIndexerProgressMonitor;
import org.hibernate.search.engine.DocumentBuilder;
import org.hibernate.search.util.logging.impl.LoggerFactory;

/**
 * Stateless implementation that performs a <code>DeleteLuceneWork</code>.
 *
 * @author Emmanuel Bernard
 * @author Hardy Ferentschik
 * @author John Griffin
 * @author Sanne Grinovero
 * @see LuceneWorkVisitor
 * @see LuceneWorkDelegate
 */
class DeleteWorkDelegate implements LuceneWorkDelegate {

    private static final Log log = LoggerFactory.make();
    private final Workspace workspace;

    DeleteWorkDelegate(Workspace workspace) {
        this.workspace = workspace;
    }

    public void performWork(LuceneWork work, IndexWriter writer) {
        final Class<?> entityType = work.getEntityClass();
        final Serializable id = work.getId();
        log.tracef("Removing %s#%s by query.", entityType, id);
        DocumentBuilderIndexedEntity<?> builder = workspace.getDocumentBuilder(entityType);

        BooleanQuery entityDeletionQuery = new BooleanQuery();

        Query idQueryTerm;
        if (isIdNumeric(entityType, builder)) {
            idQueryTerm = NumericFieldUtils.createExactMatchQuery(builder.getIdKeywordName(), id);
        } else {
            idQueryTerm = new TermQuery(builder.getTerm(id));
        }
        entityDeletionQuery.add(idQueryTerm, BooleanClause.Occur.MUST);

        Term classNameQueryTerm = new Term(DocumentBuilder.CLASS_FIELDNAME, entityType.getName());
        TermQuery classNameQuery = new TermQuery(classNameQueryTerm);
        entityDeletionQuery.add(classNameQuery, BooleanClause.Occur.MUST);

        try {
            writer.deleteDocuments(entityDeletionQuery);
        } catch (Exception e) {
            String message = "Unable to remove " + entityType + "#" + id + " from index.";
            throw new SearchException(message, e);
        }
    }

    protected static boolean isIdNumeric(Class<?> entityType, DocumentBuilderIndexedEntity<?> documentBuilder) {
        TwoWayFieldBridge idBridge = documentBuilder.getIdBridge();
        return idBridge instanceof NumericFieldBridge;
    }

    public void logWorkDone(LuceneWork work, MassIndexerProgressMonitor monitor) {
        // TODO Auto-generated method stub
    }

}