it.unimi.dsi.mg4j.query.nodes
Class MultiTerm

java.lang.Object
  extended by it.unimi.dsi.mg4j.query.nodes.Composite
      extended by it.unimi.dsi.mg4j.query.nodes.MultiTerm
All Implemented Interfaces:
Query

public class MultiTerm
extends Composite

A node representing a virtual term obtained by merging the occurrences of the given terms.

This node is mainly useful when performing query expansion. The QueryBuilderVisitor used to generate document iterators can decide which policy to use for setting the frequency and the name of the virtual term.

Author:
Sebastiano Vigna
See Also:
MultiTermIndexIterator

Field Summary
 
Fields inherited from class it.unimi.dsi.mg4j.query.nodes.Composite
query
 
Constructor Summary
MultiTerm(Term... term)
          Creates a new multi-term node.
 
Method Summary
<T> T
accept(QueryBuilderVisitor<T> visitor)
          Accepts a visitor.
 boolean equals(Object o)
           
 int hashCode()
           
 String toString()
           
 
Methods inherited from class it.unimi.dsi.mg4j.query.nodes.Composite
toString
 
Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait
 

Constructor Detail

MultiTerm

public MultiTerm(Term... term)
Creates a new multi-term node.

Parameters:
term - a vector of nodes representing distinct terms.
Throws:
IllegalArgumentException - if some term appears twice in term.
Method Detail

toString

public String toString()
Overrides:
toString in class Object

accept

public <T> T accept(QueryBuilderVisitor<T> visitor)
         throws QueryBuilderVisitorException
Description copied from interface: Query
Accepts a visitor.

Parameters:
visitor - the visitor.
Returns:
the result of the visit, or null if the visit should stop.
Throws:
QueryBuilderVisitorException
See Also:
Query

equals

public boolean equals(Object o)
Overrides:
equals in class Object

hashCode

public int hashCode()
Overrides:
hashCode in class Object