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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.VertexQuery;
import com.tinkerpop.blueprints.util.DefaultVertexQuery;
import com.tinkerpop.blueprints.util.MultiIterable;
import com.tinkerpop.blueprints.util.StringFactory;
import com.tinkerpop.blueprints.util.VerticesFromEdgesIterable;

import java.io.Serializable;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;

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

    protected Map> outEdges = new HashMap>();
    protected Map> inEdges = new HashMap>();

    protected TinkerVertex(final String id, final TinkerGraph graph) {
        super(id, graph);
    }

    public Iterable getEdges(final Direction direction, final String... labels) {
        if (direction.equals(Direction.OUT)) {
            return this.getOutEdges(labels);
        } else if (direction.equals(Direction.IN))
            return this.getInEdges(labels);
        else {
            return new MultiIterable(Arrays.asList(this.getInEdges(labels), this.getOutEdges(labels)));
        }
    }

    public Iterable getVertices(final Direction direction, final String... labels) {
        return new VerticesFromEdgesIterable(this, direction, labels);
    }

    private Iterable getInEdges(final String... labels) {
        if (labels.length == 0) {
            final List totalEdges = new ArrayList();
            for (final Collection edges : this.inEdges.values()) {
                totalEdges.addAll(edges);
            }
            return totalEdges;
        } else if (labels.length == 1) {
            final Set edges = this.inEdges.get(labels[0]);
            if (null == edges) {
                return Collections.emptyList();
            } else {
                return new ArrayList(edges);
            }
        } else {
            final List totalEdges = new ArrayList();
            for (final String label : labels) {
                final Set edges = this.inEdges.get(label);
                if (null != edges) {
                    totalEdges.addAll(edges);
                }
            }
            return totalEdges;
        }
    }

    private Iterable getOutEdges(final String... labels) {
        if (labels.length == 0) {
            final List totalEdges = new ArrayList();
            for (final Collection edges : this.outEdges.values()) {
                totalEdges.addAll(edges);
            }
            return totalEdges;
        } else if (labels.length == 1) {
            final Set edges = this.outEdges.get(labels[0]);
            if (null == edges) {
                return Collections.emptyList();
            } else {
                return new ArrayList(edges);
            }
        } else {
            final List totalEdges = new ArrayList();
            for (final String label : labels) {
                final Set edges = this.outEdges.get(label);
                if (null != edges) {
                    totalEdges.addAll(edges);
                }
            }
            return totalEdges;
        }
    }

    public VertexQuery query() {
        return new DefaultVertexQuery(this);
    }

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

    public Edge addEdge(final String label, final Vertex vertex) {
        return this.graph.addEdge(null, this, vertex, label);
    }

    protected void addOutEdge(final String label, final Edge edge) {
        Set edges = this.outEdges.get(label);
        if (null == edges) {
            edges = new HashSet();
            this.outEdges.put(label, edges);
        }
        edges.add(edge);
    }

    protected void addInEdge(final String label, final Edge edge) {
        Set edges = this.inEdges.get(label);
        if (null == edges) {
            edges = new HashSet();
            this.inEdges.put(label, edges);
        }
        edges.add(edge);
    }
}