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Class structure.GraphListDirected

java.lang.Object
    |
    +----structure.GraphList
            |
            +----structure.GraphListDirected

public class GraphListDirected

extends GraphList

See Also:

GraphList, GraphListUndirected, GraphMatrixDirected

GraphListDirected()

Construct a directed, adjacency-list based graph.

addEdge(Object, Object, Object)

Add an edge between two vertices within the graph.

edgeCount()

Determine the number of edges in graph.

remove(Object)

Remove a vertex from the graph.

removeEdge(Object, Object)

Remove possible edge between vertices labeled vLabel1 and vLabel2.

toString()

Construct a string representation of graph.

public GraphListDirected()

Construct a directed, adjacency-list based graph.

Postcondition:

constructs an directed graph

public void addEdge(Object vLabel1,
                    Object vLabel2,
                    Object label)

Add an edge between two vertices within the graph. Edge is directed. Duplicate edges are silently replaced. Labels on edges may be null.

Precondition:

vLabel1 and vLabel2 are labels of existing vertices, v1 & v2

Postcondition:

an edge is inserted between v1 and v2. if edge is new, it is labeled with label (can be null)

Parameters:

vLabel1 - Source vertex.

vLabel2 - Destination vertex.

label - Label associated with the edge.

Overrides:

addEdge in class GraphList

public Object remove(Object label)

Remove a vertex from the graph. Associated edges are also removed. Non-vertices are silently ignored.

Precondition:

label is non-null vertex label

Postcondition:

vertex with "equals" label is removed, if found

Parameters:

label - The label of the vertex within the graph.

Returns:

The label associated with the vertex.

Overrides:

remove in class GraphList

public Object removeEdge(Object vLabel1,
                         Object vLabel2)

Remove possible edge between vertices labeled vLabel1 and vLabel2. vLabel1 is the source.

Precondition:

vLabel1 and vLabel2 are labels of existing vertices

Postcondition:

edge is removed, its label is returned

Parameters:

vLabel1 - Source vertex.

vLabel2 - Destination vertex.

Returns:

The label associated with the edge removed.

Overrides:

removeEdge in class GraphList

public int edgeCount()

Determine the number of edges in graph.

Postcondition:

returns the number of edges in graph

Returns:

Number of edges in graph.

Overrides:

edgeCount in class GraphList

public String toString()

Construct a string representation of graph.

Postcondition:

returns string representation of graph

Returns:

String representing graph.

Overrides:

toString in class Object

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