56 lines
2.0 KiB
Java
56 lines
2.0 KiB
Java
package graph;
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import exceptions.InvalidPositionException;
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/**
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* An interface for a graph.
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* @author Roberto Tamassia
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*/
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public interface Graph<V, E> {
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/** Returns the number of vertices of the graph */
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public int numVertices();
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/** Returns the number of edges of the graph */
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public int numEdges();
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/** Returns the vertices of the graph as an iterable collection */
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public Iterable<Vertex<V>> vertices();
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/** Returns the edges of the graph as an iterable collection */
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public Iterable<Edge<E>> edges();
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/** Replaces the element of a given vertex with a new element and returns the old element */
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public V replace(Vertex<V> p, V o) throws InvalidPositionException;
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/** Replaces the element of a given edge with a new element and returns the old element */
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public E replace(Edge<E> p, E o) throws InvalidPositionException;
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/** Returns the edges incident on a vertex as an iterable collection */
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public Iterable<Edge<E>> incidentEdges(Vertex<V> v) throws InvalidPositionException;
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/** Returns the endvertices of a vertex as an array of length 2 */
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public Vertex[] endVertices(Edge<E> e) throws InvalidPositionException;
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/** Returns the other endvertex of an incident edge */
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public Vertex<V> opposite(Vertex<V> v, Edge<E> e) throws InvalidPositionException;
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/** Tests whether two vertices are adjacent */
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public boolean areAdjacent(Vertex<V> u, Vertex<V> v) throws InvalidPositionException;
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/** Inserts and return a new vertex with a given element */
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public Vertex<V> insertVertex(V o);
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/** Inserts and return a new edge with a given element between two vertices */
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public Edge<E> insertEdge(Vertex<V> u, Vertex<V> v, E o) throws InvalidPositionException;
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/** Removes a vertex and all its incident edges and returns the element stored at the removed vertex */
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public V removeVertex(Vertex<V> v) throws InvalidPositionException;
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/** Removes an edge and return its element */
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public E removeEdge(Edge<E> e) throws InvalidPositionException;
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}
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