Package org.codehaus.plexus.util.dag

Class DAG

java.lang.Object

org.codehaus.plexus.util.dag.DAG

All Implemented Interfaces:

Serializable, Cloneable

public class DAG
extends Object
implements Cloneable, Serializable

DAG = Directed Acyclic Graph

Author:

Michal Maczka TODO this class should be renamed from DAG to Dag

See Also:

• Serialized Form

Constructor Summary

Constructors

Constructor	Description
DAG()

Method Summary

Modifier and Type	Method	Description
void	addEdge(String from, String to)
void	addEdge(Vertex from, Vertex to)
Vertex	addVertex(String label)	Adds vertex to DAG.
Object	clone()
List<String>	getChildLabels(String label)
Set<String>	getLabels()
List<String>	getParentLabels(String label)
List<String>	getSuccessorLabels(String label)	Return the list of labels of successor in order decided by topological sort
Vertex	getVertex(String label)
List<Vertex>	getVertices()
List<Vertex>	getVerticies()	Deprecated. instead use getVertices()
boolean	hasEdge(String label1, String label2)
boolean	isConnected(String label)	Indicates if there is at least one edge leading to or from vertex of given label
void	removeEdge(String from, String to)
void	removeEdge(Vertex from, Vertex to)

Methods inherited from class java.lang.Object

equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

DAG

public DAG()

Method Details

getVertices

public List<Vertex> getVertices()

Returns:

the vertices

getVerticies

@Deprecated
public List<Vertex> getVerticies()

Deprecated.

instead use getVertices()

Returns:

the vertices

getLabels

public Set<String> getLabels()

addVertex

public Vertex addVertex(String label)

Adds vertex to DAG. If vertex of given label already exist in DAG no vertex is added

Parameters:

label - The label of the Vertex

Returns:

New vertex if vertex of given label was not present in the DAG or existing vertex if vertex of given label was already added to DAG

addEdge

public void addEdge(String from,
 String to)
             throws CycleDetectedException

Throws:

CycleDetectedException

addEdge

public void addEdge(Vertex from,
 Vertex to)
             throws CycleDetectedException

Throws:

CycleDetectedException

removeEdge

public void removeEdge(String from,
 String to)

removeEdge

public void removeEdge(Vertex from,
 Vertex to)

getVertex

public Vertex getVertex(String label)

hasEdge

public boolean hasEdge(String label1,
 String label2)

getChildLabels

public List<String> getChildLabels(String label)

Parameters:

label - see name

Returns:

the childs

getParentLabels

public List<String> getParentLabels(String label)

Parameters:

label - see name

Returns:

the parents

clone

public Object clone()
             throws CloneNotSupportedException

Overrides:

clone in class Object

Throws:

CloneNotSupportedException

See Also:

• Object.clone()

isConnected

public boolean isConnected(String label)

Indicates if there is at least one edge leading to or from vertex of given label

Parameters:

label - the label

Returns:

true if this vertex is connected with other vertex,false otherwise

getSuccessorLabels

public List<String> getSuccessorLabels(String label)

Return the list of labels of successor in order decided by topological sort

Parameters:

label - The label of the vertex whose predecessors are searched

Returns:

The list of labels. Returned list contains also the label passed as parameter to this method. This label should always be the last item in the list.