ptolemy.graph.analysis.strategy
Class SourceNodeStrategy

java.lang.Object
  ptolemy.graph.analysis.strategy.Strategy
      ptolemy.graph.analysis.strategy.CachedStrategy
          ptolemy.graph.analysis.strategy.SourceNodeStrategy

All Implemented Interfaces:

Analyzer, GraphAnalyzer, SourceNodeAnalyzer

public class SourceNodeStrategy
extends CachedStrategy
implements SourceNodeAnalyzer

Computation of source nodes in a graph. The collection returned cannot be modified.

This analysis requires O(N) time, where N is the number of nodes in the graph.

Since:

Ptolemy II 4.0

Version:

$Id: SourceNodeStrategy.java 57040 2010-01-27 20:52:32Z cxh $

Author:

Ming Yung Ko, Shahrooz Shahparnia

See Also:

SourceNodeAnalysis

Accepted Rating:

Red (ssb)

Proposed Rating:

Red (shahrooz)

Constructor Summary

SourceNodeStrategy(Graph graph)
Construct an instance of this strategy for a given graph.

Method Summary

protected java.lang.Object	_compute() Compute the source nodes in the graph in the form of a collection.
protected java.lang.Object	_convertResult() Return the result of this analysis (collection of source nodes) in a form that cannot be modified.
java.util.List	nodes() Compute the source nodes in the graph in the form of a collection.
java.lang.String	toString() Return a description of the analyzer.
boolean	valid() Check compatibility of the class of graph.

Methods inherited from class ptolemy.graph.analysis.strategy.CachedStrategy

_convertResult, _result, cachingStatus, disableCaching, enableCaching, getCachedResult, graph, obsolete, reset, setCachedResult

Methods inherited from class java.lang.Object

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

Methods inherited from interface ptolemy.graph.analysis.analyzer.GraphAnalyzer

graph

Constructor Detail

SourceNodeStrategy

public SourceNodeStrategy(Graph graph)

Construct an instance of this strategy for a given graph.

Parameters:

graph - The given graph.

Method Detail

nodes

public java.util.List nodes()

Compute the source nodes in the graph in the form of a collection. Each element of the collection is a Node.

Specified by:

nodes in interface SourceNodeAnalyzer

Returns:

The source nodes.

toString

public java.lang.String toString()

Return a description of the analyzer.

Specified by:

toString in interface Analyzer

Overrides:

toString in class CachedStrategy

Returns:

Return a description of the analyzer..

valid

public boolean valid()

Check compatibility of the class of graph. The given graph must be an instance of DirectedGraph.

Specified by:

valid in interface Analyzer

Returns:

True if the given graph is of class DirectedGraph.

_compute

protected java.lang.Object _compute()

Compute the source nodes in the graph in the form of a collection. Each element of the collection is a Node.

Overrides:

_compute in class CachedStrategy

Returns:

The source nodes.

_convertResult

protected java.lang.Object _convertResult()

Return the result of this analysis (collection of source nodes) in a form that cannot be modified.

Returns:

The analysis result in unmodifiable form.