| java.lang.Object
 org.geotools.graph.io.standard.AbstractReaderWriter
org.geotools.graph.io.standard.TextfileReaderWriter
| TextfileReaderWriter | | abstract public class TextfileReaderWriter extends AbstractReaderWriter implements FileReaderWriter(Code) | | An implementation of GraphReaderWriter that reads/writes graphs from/to text
files. Each line of the text file represents an object to be modelled by
the graph.
When performing a read, the text file is read line by line. As each line
is read it is tokenized based on the delimiter property, and passed to the
template method readInternal(StringTokenizer), which must be implemented
by a subclass. The method returns the object that is to be represented in
the graph. The returned object is then passed to an underlying GraphGenerator
which creates the necessary graph components to modell the object.
When performing a write, the graph is read component by component based
on set properties. If the NODES property is set, nodes will be written. If
the EDGES property is set, edges will be written as well. As each component
is processed, it is passed to the repspective template methods
writeNode(Writer,Node) and writeEdge(Writer,Edge). The methods then write
out the text representation of the component.
author:
Justin Deoliveira, Refractions Research Inc, jdeolive@refractions.net |
| Method Summary | |
| public Graph | read()
Performs a read of the text file line by line. | | abstract protected Object | readInternal(StringTokenizer st)
Template method for returning the object represented by a line in the
text file being read.
Parameters:
st - The tokenized line read from text file. | | public void | write(Graph g)
Performs a write on the graph out to a text file. | | protected void | writeEdge(Writer out, Edge e)
Template method for writing the text representation of an edge to
an text file. | | protected void | writeNode(Writer out, Node n)
Template method for writing the text representation of a node to
an text file. |
| DELIMITER | | final public static String DELIMITER(Code) | | line delimiter key *
|
| read | | public Graph read() throws Exception(Code) | | Performs a read of the text file line by line. As each line is read the
corresponding graph components represented by the line of text are
created by an underlying GraphGenerator.
See Also: GraphGenerator.read |
| readInternal | | abstract protected Object readInternal(StringTokenizer st)(Code) | | Template method for returning the object represented by a line in the
text file being read.
Parameters:
st - The tokenized line read from text file. The object represented by the line of text. |
| write | | public void write(Graph g) throws Exception(Code) | | Performs a write on the graph out to a text file. If the NODES property
is set, the nodes of the graph will be written, and if the EDGES property
is set, the edges of the graph will be written.
See Also: GraphGenerator.write |
| writeEdge | | protected void writeEdge(Writer out, Edge e)(Code) | | Template method for writing the text representation of an edge to
an text file.
Parameters:
out - The text file writer.
Parameters:
e - The edge to write. |
| writeNode | | protected void writeNode(Writer out, Node n)(Code) | | Template method for writing the text representation of a node to
an text file.
Parameters:
out - The text file writer.
Parameters:
n - The node to write. |
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