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Core interfaces and utilities for Blueprints

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package com.tinkerpop.blueprints.impls.tg;

import com.tinkerpop.blueprints.Direction;
import com.tinkerpop.blueprints.Edge;
import com.tinkerpop.blueprints.Vertex;
import com.tinkerpop.blueprints.util.ExceptionFactory;
import com.tinkerpop.blueprints.util.StringFactory;

import java.io.Serializable;


/**
 * @author Marko A. Rodriguez (http://markorodriguez.com)
 */
class TinkerEdge extends TinkerElement implements Edge, Serializable {

    private final String label;
    private final Vertex inVertex;
    private final Vertex outVertex;

    protected TinkerEdge(final String id, final Vertex outVertex, final Vertex inVertex, final String label, final TinkerGraph graph) {
        super(id, graph);
        this.label = label;
        this.outVertex = outVertex;
        this.inVertex = inVertex;
        this.graph.edgeKeyIndex.autoUpdate(StringFactory.LABEL, this.label, null, this);
    }

    public String getLabel() {
        return this.label;
    }

    public Vertex getVertex(final Direction direction) throws IllegalArgumentException {
        if (direction.equals(Direction.IN))
            return this.inVertex;
        else if (direction.equals(Direction.OUT))
            return this.outVertex;
        else
            throw ExceptionFactory.bothIsNotSupported();
    }

    public String toString() {
        return StringFactory.edgeString(this);
    }
}