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/*
 * Generic graph library
 * Copyright (C) 2000,2003,2004 University of Maryland
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

// $Revision: 1.15 $

package edu.umd.cs.findbugs.graph;

import java.util.Iterator;

/**
 * Graph interface; defines the operations used to access and manipulate a
 * graph.
 */
public interface Graph, VertexType extends GraphVertex> {

    /**
     * Get number of edges in the graph.
     */
    public int getNumEdges();

    /**
     * Get number of vertices in the graph.
     */
    public int getNumVertices();

    /**
     * Get Iterator over all edges in the graph.
     */
    public Iterator edgeIterator();

    /**
     * Get Iterator over all vertices in the graph.
     */
    public Iterator vertexIterator();

    /**
     * Add given vertex to the graph. The vertex should not be part of any other
     * graph.
     *
     * @param v
     *            the vertex to add
     */
    public void addVertex(VertexType v);

    /**
     * Determine if the graph contains the given vertex.
     *
     * @param v
     *            the vertex
     * @return true if the vertex is part of the graph, false if not
     */
    public boolean containsVertex(VertexType v);

    /**
     * Add a new edge to the graph. Duplicate edges (with same source and target
     * vertices) are allowed.
     *
     * @param source
     *            the source vertex
     * @param target
     *            the target vertex
     * @return the new edge
     */
    public EdgeType createEdge(VertexType source, VertexType target);

    /**
     * Look up an edge by source and target vertex. If multiple edges with same
     * source and target vertex exist, one is selected arbitrarily.
     *
     * @param source
     *            the source vertex
     * @param target
     *            the target vertex
     * @return a matching edge, or null if there is no matching edge
     */
    public EdgeType lookupEdge(VertexType source, VertexType target);

    /**
     * Get the number of numeric (integer) labels that have been assigned to
     * vertices in the graph. All vertices in the graph are guaranteed to have
     * labels in the range 0..n, where n is the value returned by this method.
     */
    public int getNumVertexLabels();

    /**
     * Reset number of (integer) labels. This might be necessary if an algorithm
     * has assigned new labels to a graph's vertices.
     */
    public void setNumVertexLabels(int numLabels);

    /**
     * Get the number of numeric labels that have been assigned to edges.
     */
    public int getNumEdgeLabels();

    /**
     * Reset the number of edge labels.
     */
    public void setNumEdgeLabels(int numLabels);

    /**
     * Remove given edge from the graph.
     */
    public void removeEdge(EdgeType e);

    /**
     * Remove given vertex from the graph. Note that all edges referencing the
     * vertex will be removed.
     */
    public void removeVertex(VertexType v);

    /**
     * Get an Iterator over outgoing edges from given vertex.
     *
     * @param source
     *            the source vertex
     * @return an Iterator over outgoing edges
     */
    public Iterator outgoingEdgeIterator(VertexType source);

    /**
     * Get an Iterator over incoming edges to a given vertex.
     *
     * @param target
     *            the target vertex
     * @return an Iterator over incoming edges
     */
    public Iterator incomingEdgeIterator(VertexType target);

    /**
     * Get number of edges going into given vertex.
     *
     * @param vertex
     *            the vertex
     * @return number of edges going into the vertex
     */
    public int getNumIncomingEdges(VertexType vertex);

    /**
     * Get number of edges going out of given vertex.
     *
     * @param vertex
     *            the vertex
     * @return number of edges going out of the vertex
     */
    public int getNumOutgoingEdges(VertexType vertex);

    /**
     * Get an iterator over the successors of this vertex; i.e., the targets of
     * the vertex's outgoing edges.
     *
     * @param source
     *            the source vertex
     * @return an Iterator over the successors of the vertex
     */
    public Iterator successorIterator(VertexType source);

    /**
     * Get an iterator over the predecessors of this vertex; i.e., the sources
     * of the vertex's incoming edges.
     *
     * @param target
     *            the target vertex
     * @return an Iterator over the predecessors of the vertex
     */
    public Iterator predecessorIterator(VertexType target);

}