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java.lang.Object org.geotools.graph.io.standard.AbstractReaderWriter org.geotools.graph.io.standard.TextfileReaderWriter
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.
Field Summary | |
static java.lang.String |
DELIMITER
line delimiter key |
Fields inherited from class org.geotools.graph.io.standard.AbstractReaderWriter |
BUILDER, EDGES, GENERATOR, NODES |
Fields inherited from interface org.geotools.graph.io.standard.FileReaderWriter |
FILENAME |
Constructor Summary | |
TextfileReaderWriter()
|
Method Summary | |
Graph |
read()
Performs a read of the text file line by line. |
protected abstract java.lang.Object |
readInternal(java.util.StringTokenizer st)
Template method for returning the object represented by a line in the text file being read. |
void |
write(Graph g)
Performs a write on the graph out to a text file. |
protected void |
writeEdge(java.io.Writer out,
Edge e)
Template method for writing the text representation of an edge to an text file. |
protected void |
writeNode(java.io.Writer out,
Node n)
Template method for writing the text representation of a node to an text file. |
Methods inherited from class org.geotools.graph.io.standard.AbstractReaderWriter |
getProperty, setProperty, setProperty |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Methods inherited from interface org.geotools.graph.io.GraphReaderWriter |
getProperty, setProperty |
Field Detail |
public static final java.lang.String DELIMITER
Constructor Detail |
public TextfileReaderWriter()
Method Detail |
public Graph read() throws java.lang.Exception
read
in interface GraphReaderWriter
java.lang.Exception
GraphGenerator#read()
public void write(Graph g) throws java.lang.Exception
write
in interface GraphReaderWriter
g
- The graph to be
java.lang.Exception
protected void writeNode(java.io.Writer out, Node n)
out
- The text file writer.n
- The node to write.protected void writeEdge(java.io.Writer out, Edge e)
out
- The text file writer.e
- The edge to write.protected abstract java.lang.Object readInternal(java.util.StringTokenizer st)
st
- The tokenized line read from text file.
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