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Graph Database API for Neo4j.

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/*
 * Copyright (c) "Neo4j"
 * Neo4j Sweden AB [http://neo4j.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 .
 */
package org.neo4j.graphdb.traversal;

import org.neo4j.annotations.api.PublicApi;

/**
 * A catalogue of convenient side selector policies for use in bidirectional traversals.
 */
@PublicApi
public enum SideSelectorPolicies implements SideSelectorPolicy
{
    /**
     * This `SideSelectorPolicy` stops traversal if the combined depth is larger than the given maximum depth. It
     * will select branches for expansion that are on the same depth as the current branch before moving on to the
     * next depth.
     */
    LEVEL
    {
        @Override
        public SideSelector create( BranchSelector start, BranchSelector end, int maxDepth )
        {
            return new LevelSelectorOrderer( start, end, false, maxDepth );
        }
    },
    /**
     * This `SideSelectorPolicy` stops as soon as a result is found. It will select branches for expansion that are on
     * the same depth as the current branch before moving on to the next depth.
     */
    LEVEL_STOP_DESCENT_ON_RESULT
    {
        @Override
        public SideSelector create( BranchSelector start, BranchSelector end, int maxDepth )
        {
            return new LevelSelectorOrderer( start, end, true, maxDepth );
        }
    },
    /**
     * This `SideSelectorPolicy` alternates which branch continues the traversal.
     */
    ALTERNATING
    {
        @Override
        public SideSelector create( BranchSelector start, BranchSelector end, int maxDepth )
        {
            return new AlternatingSelectorOrderer( start, end );
        }
    }
}