com.rapidminer.example.table
Class SparseFormatDataRowReader

java.lang.Object
  com.rapidminer.example.table.AbstractDataRowReader
      com.rapidminer.example.table.SparseFormatDataRowReader

All Implemented Interfaces:

DataRowReader, java.util.Iterator<DataRow>

public class SparseFormatDataRowReader
extends AbstractDataRowReader

Reads the data rows in sparse format. The format is specified in the class comment of SparseFormatExampleSource. Attributes may be passed to the reader in its constructor. If they are ommitted, they are generated on the fly. In either case, indices are assigned to the attributes. If an AbstractExampleTable is generated using instances of this class, the constructor of AbstractExampleTable will reassign these indexes.

Author:

Simon Fischer, Ingo Mierswa ingomierswa Exp $

Field Summary

static java.lang.String[]	FORMAT_NAMES Names of the formats.
static int	FORMAT_NO_LABEL Label is missing.
static int	FORMAT_PREFIX Label has a prefix specified in the prefix map.
static int	FORMAT_SEPARATE_FILE Label is in separate file.
static int	FORMAT_XY Label succeeds attributes.
static int	FORMAT_YX Label preceeds attributes.

Constructor Summary

SparseFormatDataRowReader(DataRowFactory factory, int format, java.util.Map<java.lang.String,java.lang.String> prefixMap, AttributeSet attributeSet, java.io.Reader attributeReader, java.io.Reader labelReader, int sampleSize)
Creates a new data row reader for sparse format.

Method Summary

boolean	hasNext() Checks if futher examples exist.
DataRow	next() Returns the next Example.

Methods inherited from class com.rapidminer.example.table.AbstractDataRowReader

getFactory, remove

Methods inherited from class java.lang.Object

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

Field Detail

FORMAT_NAMES

public static final java.lang.String[] FORMAT_NAMES

Names of the formats.

FORMAT_XY

public static final int FORMAT_XY

Label succeeds attributes.

See Also:

Constant Field Values

FORMAT_YX

public static final int FORMAT_YX

Label preceeds attributes.

See Also:

Constant Field Values

FORMAT_PREFIX

public static final int FORMAT_PREFIX

Label has a prefix specified in the prefix map.

See Also:

Constant Field Values

FORMAT_SEPARATE_FILE

public static final int FORMAT_SEPARATE_FILE

Label is in separate file.

See Also:

Constant Field Values

FORMAT_NO_LABEL

public static final int FORMAT_NO_LABEL

Label is missing.

See Also:

Constant Field Values

Constructor Detail

SparseFormatDataRowReader

public SparseFormatDataRowReader(DataRowFactory factory,
                                 int format,
                                 java.util.Map<java.lang.String,java.lang.String> prefixMap,
                                 AttributeSet attributeSet,
                                 java.io.Reader attributeReader,
                                 java.io.Reader labelReader,
                                 int sampleSize)

Creates a new data row reader for sparse format. The attributes indices must not be set. If they are, they are reassigned new values when this constructor is called!

Parameters:

factory - Factory used to create DataRow instances.

format - One Out of FORMAT_XY, FORMAT_YX, FORMAT_PREFIX, and FORMAT_SEPARATE_FILE.

prefixMap - Maps prefixes to special attribute names (e.g. "l" to "label").

attributeSet - Set of regular and special attributes.

attributeReader - Reader for the data

labelReader - Reader for the labels. Only necessary if format is FORMAT_SEPARATE_FILE.

sampleSize - sample size, may be -1 for no limit.

Method Detail

hasNext

public boolean hasNext()

Checks if futher examples exist. Returns false if one of the files end.

next

public DataRow next()

Returns the next Example.