cc.mallet.pipe.iterator

Class CsvIterator

java.lang.Object

cc.mallet.pipe.iterator.CsvIterator

All Implemented Interfaces:

java.util.Iterator<Instance>

public class CsvIterator
extends java.lang.Object
implements java.util.Iterator<Instance>

This iterator, perhaps more properly called a Line Pattern Iterator, reads through a file and returns one instance per line, based on a regular expression.

If you have data of the form

[name]  [label]  [data]

and a Pipe instancePipe, you could read instances using this code:

    InstanceList instances = new InstanceList(instancePipe);

    instances.addThruPipe(new CsvIterator(new FileReader(dataFile),
                                          "(\\w+)\\s+(\\w+)\\s+(.*)",
                                          3, 2, 1)  // (data, target, name) field indices                    
                         );

Constructor Summary

Constructors

Constructor and Description
CsvIterator(java.io.Reader input, java.util.regex.Pattern lineRegex, int dataGroup, int targetGroup, int uriGroup)
CsvIterator(java.io.Reader input, java.lang.String lineRegex, int dataGroup, int targetGroup, int uriGroup)
CsvIterator(java.lang.String filename, java.lang.String lineRegex, int dataGroup, int targetGroup, int uriGroup)

Method Summary

Modifier and Type	Method and Description
boolean	hasNext()
Instance	next()
void	remove()

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Iterator

forEachRemaining

Constructor Detail

CsvIterator

public CsvIterator(java.io.Reader input,
                   java.util.regex.Pattern lineRegex,
                   int dataGroup,
                   int targetGroup,
                   int uriGroup)

CsvIterator

public CsvIterator(java.io.Reader input,
                   java.lang.String lineRegex,
                   int dataGroup,
                   int targetGroup,
                   int uriGroup)

CsvIterator

public CsvIterator(java.lang.String filename,
                   java.lang.String lineRegex,
                   int dataGroup,
                   int targetGroup,
                   int uriGroup)
            throws java.io.FileNotFoundException

Throws:

java.io.FileNotFoundException

Method Detail

next

public Instance next()

Specified by:

next in interface java.util.Iterator<Instance>

hasNext

public boolean hasNext()

Specified by:

hasNext in interface java.util.Iterator<Instance>

remove

public void remove()

Specified by:

remove in interface java.util.Iterator<Instance>