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

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Here is the source code for org.hibernate.search.backend.impl.lucene.works.DeleteExtWorkDelegate.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.hibernate.annotations.common.AssertionFailure;
import org.hibernate.search.SearchException;
import org.hibernate.search.backend.LuceneWork;
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.LoggerFactory;
import org.hibernate.search.util.logging.impl.Log;

/**
 * Extension of <code>DeleteLuceneWork</code> bound to a single entity.
 * This allows to perform the delete LuceneWork in an optimal way in case
 * the index is NOT shared across different entities (which is the default).
 *
 * @author Sanne Grinovero
 * @see DeleteWorkDelegate
 */
public class DeleteExtWorkDelegate extends DeleteWorkDelegate {

    private final Class<?> managedType;
    private final DocumentBuilderIndexedEntity<?> builder;
    private static final Log log = LoggerFactory.make();
    private final boolean idIsNumeric;

    DeleteExtWorkDelegate(Workspace workspace) {
        super(workspace);
        managedType = workspace.getEntitiesInIndexManager().iterator().next();
        builder = workspace.getDocumentBuilder(managedType);
        idIsNumeric = isIdNumeric(managedType, builder);
    }

    @Override
    public void performWork(LuceneWork work, IndexWriter writer) {
        checkType(work);
        Serializable id = work.getId();
        log.tracef("Removing %s#%s by id using an IndexWriter.", managedType, id);
        try {
            if (idIsNumeric) {
                writer.deleteDocuments(NumericFieldUtils.createExactMatchQuery(builder.getIdKeywordName(), id));
            } else {
                Term idTerm = builder.getTerm(id);
                writer.deleteDocuments(idTerm);
            }
        } catch (Exception e) {
            String message = "Unable to remove " + managedType + "#" + id + " from index.";
            throw new SearchException(message, e);
        }
    }

    private void checkType(final LuceneWork work) {
        if (work.getEntityClass() != managedType) {
            throw new AssertionFailure("Unexpected type");
        }
    }

}