org.jrdf.sparql.analysis
Class AttributeCollectorImpl

java.lang.Object
  org.jrdf.sparql.analysis.AttributeCollectorImpl

All Implemented Interfaces:

Serializable, VariableCollector

public class AttributeCollectorImpl
extends Object
implements VariableCollector

A variable collector takes the attribute value pairs from constraints and add them to a map. Used to construct queries. As node types are gathered they are upgraded to compount types if they have stood in different positions in a constraint. For example ?uri <> <> . <> ?uri <> would create a attribute ?uri which of of type SubjectPredicateNodeType.

Version:

$Revision: 1078 $

Author:

Andrew Newman

See Also:

Serialized Form

Constructor Summary

AttributeCollectorImpl()

Method Summary

void	addConstraints(Map<Attribute,Node> avps)
Map<AttributeName,PositionalNodeType>	getAttributes()
String	toString()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

AttributeCollectorImpl

public AttributeCollectorImpl()

Method Detail

addConstraints

public void addConstraints(Map<Attribute,Node> avps)

Specified by:

addConstraints in interface VariableCollector

getAttributes

public Map<AttributeName,PositionalNodeType> getAttributes()

Specified by:

getAttributes in interface VariableCollector

toString

public String toString()

Overrides:

toString in class Object