org.neo4j.index.impl.lucene.LuceneUtil.java Source code

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Here is the source code for org.neo4j.index.impl.lucene.LuceneUtil.java

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/**
 * Copyright (c) 2002-2014 "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.index.impl.lucene;

import java.io.IOException;

import org.apache.lucene.document.Document;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.NumericRangeQuery;
import org.apache.lucene.search.Query;
import org.neo4j.index.lucene.ValueContext;

public abstract class LuceneUtil {
    static void close(IndexWriter writer) {
        close((Object) writer);
    }

    static void close(IndexSearcher searcher) {
        close((Object) searcher);
    }

    private static void close(Object object) {
        if (object == null) {
            return;
        }

        try {
            if (object instanceof IndexWriter) {
                ((IndexWriter) object).close();
            } else if (object instanceof IndexSearcher) {
                ((IndexSearcher) object).close();
            }
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

    static void strictAddDocument(IndexWriter writer, Document document) {
        try {
            writer.addDocument(document);
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

    static void strictRemoveDocument(IndexWriter writer, Query query) {
        try {
            writer.deleteDocuments(query);
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

    /**
     * Will create a {@link Query} with a query for numeric ranges, that is
     * values that have been indexed using {@link ValueContext#indexNumeric()}.
     * It will match the type of numbers supplied to the type of values that
     * are indexed in the index, f.ex. long, int, float and double.
     * If both {@code from} and {@code to} is {@code null} then it will default
     * to int.
     * 
     * @param key the property key to query.
     * @param from the low end of the range (inclusive)
     * @param to the high end of the range (inclusive)
     * @param includeFrom whether or not {@code from} (the lower bound) is inclusive
     * or not.
     * @param includeTo whether or not {@code to} (the higher bound) is inclusive
     * or not.
     * @return a {@link Query} to do numeric range queries with.
     */
    public static Query rangeQuery(String key, Number from, Number to, boolean includeFrom, boolean includeTo) {
        if (from instanceof Long || to instanceof Long) {
            return NumericRangeQuery.newLongRange(key, from != null ? from.longValue() : 0,
                    to != null ? to.longValue() : Long.MAX_VALUE, includeFrom, includeTo);
        } else if (from instanceof Double || to instanceof Double) {
            return NumericRangeQuery.newDoubleRange(key, from != null ? from.doubleValue() : 0,
                    to != null ? to.doubleValue() : Double.MAX_VALUE, includeFrom, includeTo);
        } else if (from instanceof Float || to instanceof Float) {
            return NumericRangeQuery.newFloatRange(key, from != null ? from.floatValue() : 0,
                    to != null ? to.floatValue() : Float.MAX_VALUE, includeFrom, includeTo);
        } else {
            return NumericRangeQuery.newIntRange(key, from != null ? from.intValue() : 0,
                    to != null ? to.intValue() : Integer.MAX_VALUE, includeFrom, includeTo);
        }
    }
}