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java.lang.Objectweka.core.converters.AbstractLoader
public abstract class AbstractLoader
Abstract class gives default implementation of setSource methods. All other methods must be overridden.
Field Summary |
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Fields inherited from interface weka.core.converters.Loader |
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BATCH, INCREMENTAL, NONE |
Constructor Summary | |
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AbstractLoader()
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Method Summary | |
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abstract Instances |
getDataSet()
Return the full data set. |
abstract Instance |
getNextInstance(Instances structure)
Read the data set incrementally---get the next instance in the data set or returns null if there are no more instances to get. |
abstract Instances |
getStructure()
Determines and returns (if possible) the structure (internally the header) of the data set as an empty set of instances. |
void |
reset()
Default implementation sets retrieval mode to NONE |
void |
setRetrieval(int mode)
Sets the retrieval mode. |
void |
setSource(java.io.File file)
Default implementation throws an IOException. |
void |
setSource(java.io.InputStream input)
Default implementation throws an IOException. |
Methods inherited from class java.lang.Object |
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equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Methods inherited from interface weka.core.RevisionHandler |
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getRevision |
Constructor Detail |
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public AbstractLoader()
Method Detail |
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public void setRetrieval(int mode)
setRetrieval
in interface Loader
mode
- the retrieval modepublic void setSource(java.io.File file) throws java.io.IOException
setSource
in interface Loader
file
- the File
java.io.IOException
- alwayspublic void reset() throws java.lang.Exception
reset
in interface Loader
never.
java.lang.Exception
- if Loader can't be reset for some reason.public void setSource(java.io.InputStream input) throws java.io.IOException
setSource
in interface Loader
input
- the input stream
java.io.IOException
- alwayspublic abstract Instances getStructure() throws java.io.IOException
Loader
getStructure
in interface Loader
java.io.IOException
- if there is no source or parsing fails
public_normal_behavior requires: model_sourceSupplied == true && model_structureDetermined == false && (* successful parse *); modifiable: model_structureDetermined; ensures: \result != null && \result.numInstances() == 0 && model_structureDetermined == true; also public_exceptional_behavior requires: model_sourceSupplied == false || (* unsuccessful parse *); signals: (IOException);
public abstract Instances getDataSet() throws java.io.IOException
Loader
getDataSet
in interface Loader
java.io.IOException
- if there is an error during parsing or if
getNextInstance has been called on this source (either incremental
or batch loading can be used, not both).
public_normal_behavior requires: model_sourceSupplied == true && (* successful parse *); modifiable: model_structureDetermined; ensures: \result != null && \result.numInstances() >= 0 && model_structureDetermined == true; also public_exceptional_behavior requires: model_sourceSupplied == false || (* unsuccessful parse *); signals: (IOException);
public abstract Instance getNextInstance(Instances structure) throws java.io.IOException
Loader
getNextInstance
in interface Loader
structure
- the dataset header information, will get updated in
case of string or relational attributes
java.io.IOException
- if there is an error during parsing or if
getDataSet has been called on this source (either incremental
or batch loading can be used, not both).
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