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Java Source Code / Java Documentation » Search Engine » compass 2.0 » org.compass.core.engine.subindex 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


java.lang.Object
   org.compass.core.engine.subindex.ModuloSubIndexHash

ModuloSubIndexHash
public class ModuloSubIndexHash implements SubIndexHash,CompassConfigurable(Code)
Uses a hash function based on hash code computation of alias and ids, and using the modulo operation against the configured size.

The sub index name is prefix_(hashCode % size).

If using configuration, expects prefix as the setting name, and size as the modulo right hand side operation.
author:
   kimchy




Constructor Summary
public  ModuloSubIndexHash()
     Constructs a new instance, will have to be configured.
public  ModuloSubIndexHash(String prefix, int size)
     Constructs a new instance, using the given prefix and size.

Method Summary
public  voidconfigure(CompassSettings settings)
     Using configuration, expects prefix as the setting name, and size as the modulo right hand side operation.
public  String[]getSubIndexes()
     Returns all the sub indexes possible, basically in the form of prefix_(0..size) (not including size).
public  StringmapSubIndex(String alias, Property[] ids)
     Computes the hash code of alias and all the ids, and then modulo it by size.
public  StringtoString()
    


Constructor Detail
ModuloSubIndexHash
public ModuloSubIndexHash()(Code)
Constructs a new instance, will have to be configured.



ModuloSubIndexHash
public ModuloSubIndexHash(String prefix, int size)(Code)
Constructs a new instance, using the given prefix and size.
Parameters:
  prefix - The prefix sed for the sub index prefix name
Parameters:
  size - The size the modulo will be used




Method Detail
configure
public void configure(CompassSettings settings) throws CompassException(Code)
Using configuration, expects prefix as the setting name, and size as the modulo right hand side operation.
Parameters:
  settings - The setting to configure by
throws:
  CompassException -



getSubIndexes
public String[] getSubIndexes()(Code)
Returns all the sub indexes possible, basically in the form of prefix_(0..size) (not including size).



mapSubIndex
public String mapSubIndex(String alias, Property[] ids) throws SearchEngineException(Code)
Computes the hash code of alias and all the ids, and then modulo it by size. The prefix is prepended (with an underscore), and the sub index is constructed. The formula is: prefix_(hashCode % size).



toString
public String toString()(Code)



Methods inherited from java.lang.Object
native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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