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

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

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/*
 * Hibernate Search, full-text search for your domain model
 *
 * License: GNU Lesser General Public License (LGPL), version 2.1 or later
 * See the lgpl.txt file in the root directory or <http://www.gnu.org/licenses/lgpl-2.1.html>.
 */
package org.hibernate.search.backend.impl.lucene.works;

import java.io.IOException;

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.backend.DeleteByQueryLuceneWork;
import org.hibernate.search.backend.IndexingMonitor;
import org.hibernate.search.backend.LuceneWork;
import org.hibernate.search.backend.DeletionQuery;
import org.hibernate.search.backend.impl.DeleteByQuerySupport;
import org.hibernate.search.engine.ProjectionConstants;
import org.hibernate.search.exception.SearchException;
import org.hibernate.search.store.Workspace;
import org.hibernate.search.util.impl.ScopedAnalyzer;
import org.hibernate.search.util.logging.impl.Log;
import org.hibernate.search.util.logging.impl.LoggerFactory;

/**
 * Stateless implementation that performs a <code>DeleteByQueryWork</code>.
 *
 * @author Martin Braun
 * @see LuceneWorkVisitor
 * @see LuceneWorkDelegate
 */
class DeleteByQueryWorkDelegate implements LuceneWorkDelegate {

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

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

    @Override
    public void performWork(LuceneWork work, IndexWriter writer, IndexingMonitor monitor) {
        DeleteByQueryLuceneWork deleteWork = (DeleteByQueryLuceneWork) work;

        final Class<?> entityType = work.getEntityClass();
        final DeletionQuery query = deleteWork.getDeletionQuery();

        if (log.isTraceEnabled()) {
            log.tracef("Removing all %s matching Query: %s", entityType.toString(), query.toString());
        }

        BooleanQuery entityDeletionQuery = new BooleanQuery();

        {
            DeleteByQuerySupport.ToLuceneQuery converter = DeleteByQuerySupport
                    .getToLuceneQuery(query.getQueryKey());

            ScopedAnalyzer analyzer = this.workspace.getDocumentBuilder(entityType).getAnalyzer();
            Query queryToDelete = converter.build(query, analyzer);

            entityDeletionQuery.add(queryToDelete, BooleanClause.Occur.MUST);
        }

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

        try {
            writer.deleteDocuments(entityDeletionQuery);
        } catch (IOException e) {
            SearchException ex = log.unableToDeleteByQuery(entityType, query, e);
            throw ex;
        }
        this.workspace.notifyWorkApplied(work);

    }

}