org.apache.slide.search.basic.expression
Class CompareExpression

java.lang.Object
  org.apache.slide.search.basic.expression.BasicExpression
      org.apache.slide.search.basic.expression.GenericBasicExpression
          org.apache.slide.search.basic.expression.CompareExpression

All Implemented Interfaces:

IBasicExpression

Direct Known Subclasses:

ComparePropertyExpression, ContainsExpression

public abstract class CompareExpression

extends GenericBasicExpression

Abstract base class for compare expressions (property compares, contains).

Version:

$Revision: 1.5 $

Field Summary

protected PropertyProvider	propertyProvider The PropertyProvider to use (may be null).
protected ComparableResourcesPool	requestedResourcesPool The pool of resources to apply the expression to.

Fields inherited from class org.apache.slide.search.basic.expression.BasicExpression

expressionElement, expressionFactory, resultSet

Constructor Summary

(package private)

CompareExpression(org.jdom.Element e, ComparableResourcesPool requestedResourcesPool) Creates a compare expression according to Element e

Method Summary

protected abstract boolean	compare(ComparableResource item) The concrete CompareExpression must overwrite this.
IBasicResultSet	execute() Executes the expression.
ComparableResourcesPool	getRequestedResourcePool() Returns the RequestedResourcesPool to use.
void	setRequestedResourcePool(ComparableResourcesPool pool)

Methods inherited from class org.apache.slide.search.basic.expression.BasicExpression

getFactory, setFactory

Methods inherited from class java.lang.Object

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

Field Detail

requestedResourcesPool

protected ComparableResourcesPool requestedResourcesPool

The pool of resources to apply the expression to.

propertyProvider

protected PropertyProvider propertyProvider

The PropertyProvider to use (may be null).

Constructor Detail

CompareExpression

CompareExpression(org.jdom.Element e,
                  ComparableResourcesPool requestedResourcesPool)
            throws InvalidQueryException

Creates a compare expression according to Element e

Parameters:

e - jdom element, that describes the expression

requestedResourcesPool - the pool of resources to apply the expression to.

Method Detail

execute

public IBasicResultSet execute()
                        throws SearchException

Executes the expression.

Returns:

a Set of RequestedResource objects

Throws:

SearchException

getRequestedResourcePool

public ComparableResourcesPool getRequestedResourcePool()

Returns the RequestedResourcesPool to use.

Returns:

the RequestedResourcesPool to use.

setRequestedResourcePool

public void setRequestedResourcePool(ComparableResourcesPool pool)

Specified by:

setRequestedResourcePool in class GenericBasicExpression

compare

protected abstract boolean compare(ComparableResource item)

The concrete CompareExpression must overwrite this.

Parameters:

item - one BasicDataItem out of pool

Returns:

a boolean