edu.udo.cs.yale.example
Class SPSSDataRowReader

java.lang.Object
  edu.udo.cs.yale.example.AbstractDataRowReader
      edu.udo.cs.yale.example.SPSSDataRowReader

All Implemented Interfaces:

DataRowReader, java.util.Iterator<DataRow>

public class SPSSDataRowReader
extends AbstractDataRowReader

SPSSDataRowReader implements a DataRowReader that reads DataRows from an SPSS file.

Version:

$Id: SPSSDataRowReader.java,v 1.5 2006/10/02 21:45:26 ingomierswa Exp $

Author:

Tobias Malbrecht

Nested Class Summary

private class	SPSSDataRowReader.DictionaryTermination
private class	SPSSDataRowReader.Document
private class	SPSSDataRowReader.SPSSFileHeader
private class	SPSSDataRowReader.ValueLabels
private class	SPSSDataRowReader.ValueLabelVariable
private class	SPSSDataRowReader.Variable

Field Summary

(package private) Attribute[]	attributes
(package private) AttributeSet	attributeSet
private int	commandCodeCounter
(package private) java.lang.String[]	data
(package private) DataRowFactory	dataRowFactory
private boolean	eof
(package private) SPSSDataRowReader.SPSSFileHeader	fileHeader
(package private) java.io.FileInputStream	fileReader
private boolean	lineRead
private int	linesRead
(package private) byte[]	readBuffer
private boolean	recodeUserMissings
(package private) boolean	reverseEndian
private double	sampleRatio
private int	sampleSize
private boolean	useValueLabels
(package private) java.util.LinkedHashMap<java.lang.Integer,java.lang.Integer>	variableNrTranslations
(package private) java.util.List<SPSSDataRowReader.Variable>	variables

Constructor Summary

SPSSDataRowReader(DataRowFactory factory, java.io.File file, boolean useVarLabels, boolean useValueLabels, boolean recodeUserMissings, double sampleRatio, int sampleSize)

Method Summary

private double	extractDouble(byte[] value, int offset) Extracts double from byte array.
private int	extractInt(byte[] value, int offset) Extracts int from byte array.
private java.lang.String	extractString(byte[] value, int offset, int length) Extracts string from byte array.
AttributeSet	getAttributeSet() Returns the set of attributes read from file.
boolean	hasNext() Checks if another line exists and reads.
DataRow	next() Returns the next Example.
private java.lang.String[]	readLine() Reads another line.

Methods inherited from class edu.udo.cs.yale.example.AbstractDataRowReader

getFactory, remove

Methods inherited from class java.lang.Object

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

Field Detail

fileReader

java.io.FileInputStream fileReader

readBuffer

byte[] readBuffer

reverseEndian

boolean reverseEndian

fileHeader

SPSSDataRowReader.SPSSFileHeader fileHeader

variables

java.util.List<SPSSDataRowReader.Variable> variables

variableNrTranslations

java.util.LinkedHashMap<java.lang.Integer,java.lang.Integer> variableNrTranslations

attributeSet

AttributeSet attributeSet

attributes

Attribute[] attributes

eof

private boolean eof

lineRead

private boolean lineRead

sampleRatio

private double sampleRatio

sampleSize

private int sampleSize

useValueLabels

private boolean useValueLabels

recodeUserMissings

private boolean recodeUserMissings

linesRead

private int linesRead

commandCodeCounter

private int commandCodeCounter

data

java.lang.String[] data

dataRowFactory

DataRowFactory dataRowFactory

Constructor Detail

SPSSDataRowReader

public SPSSDataRowReader(DataRowFactory factory,
                         java.io.File file,
                         boolean useVarLabels,
                         boolean useValueLabels,
                         boolean recodeUserMissings,
                         double sampleRatio,
                         int sampleSize)
                  throws java.io.IOException

Parameters:

factory - A DataRowFactory, that creates DataRows.

file - Name of the SPSS file which is to be read.

useVarLabels - Use SPSS variable labels as attribute names.

useValueLabels - Use SPSS value labels as attribute values.

recodeUserMissings - Recode SPSS user defined missings to YALE missing values.

sampleRatio - Ratio of examples that should be sampled.

sampleSize - Total number of examples which should be read.

Throws:

java.io.IOException

Method Detail

extractInt

private int extractInt(byte[] value,
                       int offset)

Extracts int from byte array.

extractDouble

private double extractDouble(byte[] value,
                             int offset)

Extracts double from byte array.

extractString

private java.lang.String extractString(byte[] value,
                                       int offset,
                                       int length)

Extracts string from byte array.

readLine

private java.lang.String[] readLine()
                             throws java.io.IOException

Reads another line.

Throws:

java.io.IOException

hasNext

public boolean hasNext()

Checks if another line exists and reads. The next line is only read once even if this method is invoked more than once.

next

public DataRow next()

Returns the next Example.

getAttributeSet

public AttributeSet getAttributeSet()

Returns the set of attributes read from file.