Package cc.mallet.pipe.iterator

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

    • Method Summary

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

      • Methods inherited from class java.lang.Object

        clone, equals, finalize, 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>