public static class ArffLoader.ArffReader extends Object implements RevisionHandler
BufferedReader reader = new BufferedReader(new FileReader("/some/where/file.arff")); ArffReader arff = new ArffReader(reader); Instances data = arff.getData(); data.setClassIndex(data.numAttributes() - 1);Typical code for incremental usage:
BufferedReader reader = new BufferedReader(new FileReader("/some/where/file.arff")); ArffReader arff = new ArffReader(reader, 1000); Instances data = arff.getStructure(); data.setClassIndex(data.numAttributes() - 1); Instance inst; while ((inst = arff.readInstance(data)) != null) { data.add(inst); }
Constructor and Description |
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ArffReader(Reader reader)
Reads the data completely from the reader.
|
ArffReader(Reader reader,
Instances template,
int lines)
Reads the data without header according to the specified template.
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ArffReader(Reader reader,
Instances template,
int lines,
int capacity)
Initializes the reader without reading the header according to the
specified template.
|
ArffReader(Reader reader,
int capacity)
Reads only the header and reserves the specified space for instances.
|
Modifier and Type | Method and Description |
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Instances |
getData()
Returns the data that was read
|
int |
getLineNo()
returns the current line number
|
String |
getRevision()
Returns the revision string.
|
Instances |
getStructure()
Returns the header format
|
Instance |
readInstance(Instances structure)
Reads a single instance using the tokenizer and returns it.
|
Instance |
readInstance(Instances structure,
boolean flag)
Reads a single instance using the tokenizer and returns it.
|
public ArffReader(Reader reader) throws IOException
getData()
method.reader
- the reader to useIOException
- if something goes wronggetData()
public ArffReader(Reader reader, int capacity) throws IOException
readInstance()
.reader
- the reader to usecapacity
- the capacity of the new datasetIOException
- if something goes wrongIllegalArgumentException
- if capacity is negativegetStructure()
,
readInstance(Instances)
public ArffReader(Reader reader, Instances template, int lines) throws IOException
getData()
method.reader
- the reader to usetemplate
- the template headerlines
- the lines read so farIOException
- if something goes wronggetData()
public ArffReader(Reader reader, Instances template, int lines, int capacity) throws IOException
readInstance()
method.reader
- the reader to usetemplate
- the template headerlines
- the lines read so farcapacity
- the capacity of the new datasetIOException
- if something goes wronggetData()
public int getLineNo()
public Instance readInstance(Instances structure) throws IOException
structure
- the dataset header information, will get updated in case
of string or relational attributesIOException
- if the information is not read successfullypublic Instance readInstance(Instances structure, boolean flag) throws IOException
structure
- the dataset header information, will get updated in case
of string or relational attributesflag
- if method should test for carriage return after each instanceIOException
- if the information is not read successfullypublic Instances getStructure()
public Instances getData()
public String getRevision()
getRevision
in interface RevisionHandler
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