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    • net.java.ao.RelatedEntityImpl Maven / Gradle / Ivy

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    This is the core library for Active Objects. It is generic and can be embedded in any environment. As such it is generic and won't contain all connection pooling, etc.

    There is a newer version: 6.1.1
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    /*
 * Copyright 2007 Daniel Spiewak
 * 
 * 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 net.java.ao;

import net.java.ao.types.TypeManager;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.index.Term;
import org.apache.lucene.index.TermDocs;
import org.apache.lucene.search.Hits;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.similar.MoreLikeThis;
import org.apache.lucene.store.Directory;

import java.io.IOException;
import java.lang.reflect.Array;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;

/**
 * @author Daniel Spiewak
 */
class RelatedEntityImpl {
    private RawEntity entity;

    public RelatedEntityImpl(RelatedEntity entity) {
        this.entity = (RawEntity) entity;
    }

    public RelatedEntity[] getRelated() throws IOException, SQLException {
        Class> type = entity.getEntityType();
        EntityManager entityManager = entity.getEntityManager();
        String table = entityManager.getNameConverters().getTableNameConverter().getName(type);
        List indexFields = Common.getSearchableFields(entityManager, type);
        String[] searchFields = new String[indexFields.size()];

        for (int i = 0; i < searchFields.length; i++) {
            searchFields[i] = table + '.' + indexFields.get(i);
        }

        Directory indexDir = ((SearchableEntityManager) entityManager).getIndexDir();
        IndexReader reader = null;

        try {
            reader = IndexReader.open(indexDir);
            IndexSearcher searcher = new IndexSearcher(indexDir);

            MoreLikeThis more = new MoreLikeThis(reader);
            more.setFieldNames(searchFields);
            more.setAnalyzer(((SearchableEntityManager) entityManager).getAnalyzer());

            int docID = -1;
            String primaryKeyField = Common.getPrimaryKeyField(type, entityManager.getNameConverters().getFieldNameConverter());
            Object primaryKeyValue = Common.getPrimaryKeyValue(entity);

            TermDocs docs = reader.termDocs(new Term(table + "." + primaryKeyField,
                    Common.getPrimaryKeyType(getTypeManager(), type).getLogicalType().valueToString(primaryKeyValue)));
            if (docs.next()) {
                docID = docs.doc();
            }

            if (docID < 0) {
                return (RelatedEntity[]) Array.newInstance(type, 0);
            }

            org.apache.lucene.search.Query query = more.like(docID);
            Hits hits = searcher.search(query);
            List> back = new ArrayList>();

            for (int i = 0; i < hits.length(); i++) {
                String entityKey = hits.doc(i).get(table + "." + primaryKeyField);
                if (entityKey.equals(primaryKeyValue.toString())) {
                    continue;
                }

                back.add((RelatedEntity) (entityManager).peer(entityManager.resolveEntityInfo(type),
                        Common.getPrimaryKeyType(getTypeManager(), type).getLogicalType().parseDefault(entityKey)));
            }

            return back.toArray((RelatedEntity[]) Array.newInstance(type, back.size()));
        } finally {
            if (reader != null) {
                try {
                    reader.close();
                } catch (IOException e) {
                }
            }
        }
    }

    private TypeManager getTypeManager() {
        return entity.getEntityManager().getProvider().getTypeManager();
    }
}
    
    
    
    

    




    
    
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