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Core interfaces and utilities for Blueprints

There is a newer version: 2.6.0

package com.tinkerpop.blueprints;

/**
 * @author Marko A. Rodriguez (http://markorodriguez.com)
 */
public enum Direction {

    OUT, IN, BOTH;

    public static final Direction[] proper = new Direction[]{OUT, IN};

    public Direction opposite() {
        if (this.equals(OUT))
            return IN;
        else if (this.equals(IN))
            return OUT;
        else
            return BOTH;
    }
}