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java.lang.Object de.lmu.ifi.dbs.elki.distance.distancefunction.AbstractDBIDDistanceFunction<FloatDistance> de.lmu.ifi.dbs.elki.distance.distancefunction.external.FileBasedFloatDistanceFunction
@Title(value="File based float distance for database objects.") @Description(value="Loads float distance values from an external text file.") public class FileBasedFloatDistanceFunction
Provides a DistanceFunction that is based on float distances given by a distance matrix of an external file.
Nested Class Summary | |
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static class |
FileBasedFloatDistanceFunction.Parameterizer
Parameterization class. |
Field Summary | |
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private Map<DBIDPair,FloatDistance> |
cache
The distance cache |
static OptionID |
MATRIX_ID
Parameter that specifies the name of the distance matrix file. |
static OptionID |
PARSER_ID
Optional parameter to specify the parsers to provide a database, must extend DistanceParser . |
Constructor Summary | |
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FileBasedFloatDistanceFunction(DistanceParser<FloatDistance> parser,
File matrixfile)
Constructor. |
Method Summary | |
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FloatDistance |
distance(DBID id1,
DBID id2)
Returns the distance between the two objects specified by their objects ids. |
boolean |
equals(Object obj)
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FloatDistance |
getDistanceFactory()
Method to get the distance functions factory. |
private void |
loadCache(DistanceParser<FloatDistance> parser,
File matrixfile)
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Methods inherited from class de.lmu.ifi.dbs.elki.distance.distancefunction.AbstractDBIDDistanceFunction |
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getInputTypeRestriction, instantiate, isMetric, isSymmetric |
Methods inherited from class java.lang.Object |
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clone, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Field Detail |
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public static final OptionID MATRIX_ID
Key: -distance.matrix
public static final OptionID PARSER_ID
DistanceParser
. If this parameter is not set,
NumberDistanceParser
is used as parser for all input files.
Key: -distance.parser
private Map<DBIDPair,FloatDistance> cache
Constructor Detail |
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public FileBasedFloatDistanceFunction(DistanceParser<FloatDistance> parser, File matrixfile)
parser
- Parsermatrixfile
- input fileMethod Detail |
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public FloatDistance distance(DBID id1, DBID id2)
distance
in interface DBIDDistanceFunction<FloatDistance>
distance
in class AbstractDBIDDistanceFunction<FloatDistance>
id1
- first object idid2
- second object id
private void loadCache(DistanceParser<FloatDistance> parser, File matrixfile) throws IOException
IOException
public FloatDistance getDistanceFactory()
DistanceFunction
getDistanceFactory
in interface DistanceFunction<DBID,FloatDistance>
getDistanceFactory
in class AbstractDBIDDistanceFunction<FloatDistance>
public boolean equals(Object obj)
equals
in class Object
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