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