com.graphaware.relcount.full.strategy.ExtractNoRelationshipProperties Maven / Gradle / Ivy

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/*
 * Copyright (c) 2013 GraphAware
 *
 * This file is part of GraphAware.
 *
 * GraphAware 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
 * .
 */

package com.graphaware.relcount.full.strategy;

import org.neo4j.graphdb.Node;
import org.neo4j.graphdb.Relationship;

import java.util.Collections;
import java.util.Map;

/**
 * A {@link RelationshipPropertiesExtractionStrategy} that extracts nothing. Singleton.
 */
public final class ExtractNoRelationshipProperties implements RelationshipPropertiesExtractionStrategy {

    private static final RelationshipPropertiesExtractionStrategy INSTANCE = new ExtractNoRelationshipProperties();

    public static RelationshipPropertiesExtractionStrategy getInstance() {
        return INSTANCE;
    }

    private ExtractNoRelationshipProperties() {
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public Map extractProperties(Relationship relationship, Node pointOfView) {
        return Collections.emptyMap();
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public int hashCode() {
        return this.getClass().getCanonicalName().hashCode();
    }
}