org.neo4j.kernel.api.impl.schema.verification.SimpleUniquenessVerifier.java Source code

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Here is the source code for org.neo4j.kernel.api.impl.schema.verification.SimpleUniquenessVerifier.java

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/*
 * Copyright (c) 2002-2016 "Neo Technology,"
 * Network Engine for Objects in Lund AB [http://neotechnology.com]
 *
 * This file is part of Neo4j.
 *
 * Neo4j is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.neo4j.kernel.api.impl.schema.verification;

import org.apache.lucene.index.Fields;
import org.apache.lucene.index.LeafReaderContext;
import org.apache.lucene.index.Term;
import org.apache.lucene.index.TermsEnum;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.TermQuery;
import org.apache.lucene.util.BytesRef;

import java.io.IOException;
import java.util.List;

import org.neo4j.kernel.api.exceptions.index.IndexEntryConflictException;
import org.neo4j.kernel.api.impl.index.partition.PartitionSearcher;
import org.neo4j.kernel.api.impl.schema.LuceneDocumentStructure;
import org.neo4j.kernel.api.index.PropertyAccessor;

/**
 * A {@link UniquenessVerifier} that is able to verify value uniqueness inside a single index partition using
 * it's {@link PartitionSearcher}.
 * <p>
 * This verifier reads all terms, checks document frequency for each term and verifies uniqueness of values from the
 * property store if document frequency is greater than 1.
 *
 * @see PartitionSearcher
 * @see DuplicateCheckingCollector
 */
public class SimpleUniquenessVerifier implements UniquenessVerifier {
    private final PartitionSearcher partitionSearcher;

    public SimpleUniquenessVerifier(PartitionSearcher partitionSearcher) {
        this.partitionSearcher = partitionSearcher;
    }

    @Override
    public void verify(PropertyAccessor accessor, int propKeyId) throws IndexEntryConflictException, IOException {
        try {
            DuplicateCheckingCollector collector = new DuplicateCheckingCollector(accessor, propKeyId);
            IndexSearcher searcher = indexSearcher();
            for (LeafReaderContext leafReaderContext : searcher.getIndexReader().leaves()) {
                Fields fields = leafReaderContext.reader().fields();
                for (String field : fields) {
                    if (LuceneDocumentStructure.NODE_ID_KEY.equals(field)) {
                        continue;
                    }

                    TermsEnum terms = LuceneDocumentStructure.originalTerms(fields.terms(field), field);
                    BytesRef termsRef;
                    while ((termsRef = terms.next()) != null) {
                        if (terms.docFreq() > 1) {
                            collector.reset();
                            searcher.search(new TermQuery(new Term(field, termsRef)), collector);
                        }
                    }
                }
            }
        } catch (IOException e) {
            Throwable cause = e.getCause();
            if (cause instanceof IndexEntryConflictException) {
                throw (IndexEntryConflictException) cause;
            }
            throw e;
        }
    }

    @Override
    public void verify(PropertyAccessor accessor, int propKeyId, List<Object> updatedPropertyValues)
            throws IndexEntryConflictException, IOException {
        try {
            DuplicateCheckingCollector collector = new DuplicateCheckingCollector(accessor, propKeyId);
            for (Object propertyValue : updatedPropertyValues) {
                collector.reset();
                Query query = LuceneDocumentStructure.newSeekQuery(propertyValue);
                indexSearcher().search(query, collector);
            }
        } catch (IOException e) {
            Throwable cause = e.getCause();
            if (cause instanceof IndexEntryConflictException) {
                throw (IndexEntryConflictException) cause;
            }
            throw e;
        }
    }

    @Override
    public void close() throws IOException {
        partitionSearcher.close();
    }

    private IndexSearcher indexSearcher() {
        return partitionSearcher.getIndexSearcher();
    }
}