Package org.jaxen.expr

Class PredicateSet

java.lang.Object

org.jaxen.expr.PredicateSet

All Implemented Interfaces:

Serializable

public class PredicateSet
extends Object
implements Serializable

Represents the collection of predicates that follow the node-test in a location path.

There is no rule that the same predicate may not appear twice in an XPath expression, nor does this class enforce any such rule. This is implemented more as a list than a set. However, adding the swme predicate twice should have no effect on the final result other than slowing it down.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor	Description
PredicateSet()	Create a new empty predicate set.

Method Summary

Modifier and Type	Method	Description
void	addPredicate(Predicate predicate)	Add a predicate to the set.
List	applyPredicate(Predicate predicate, List nodes2Filter, ContextSupport support)
protected boolean	evaluateAsBoolean(List contextNodeSet, ContextSupport support)	Returns true if any of the supplied nodes satisfy all the predicates in the set.
protected List	evaluatePredicates(List contextNodeSet, ContextSupport support)	Returns all of the supplied nodes that satisfy all the predicates in the set.
List	getPredicates()	Returns the list containing the predicates.
String	getText()	Returns the XPath string containing each of the predicates.
void	simplify()	Simplify each of the predicates in the list.

Methods inherited from class java.lang.Object

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

Constructor Detail

PredicateSet

public PredicateSet()

Create a new empty predicate set.

Method Detail

addPredicate

public void addPredicate(Predicate predicate)

Add a predicate to the set.

Parameters:

predicate - the predicate to be inserted

getPredicates

public List getPredicates()

Returns the list containing the predicates. This list is live, not a copy.

Returns:

a live list of predicates

simplify

public void simplify()

Simplify each of the predicates in the list.

getText

public String getText()

Returns the XPath string containing each of the predicates.

Returns:

the XPath string containing each of the predicates

evaluateAsBoolean

protected boolean evaluateAsBoolean(List contextNodeSet,
                                    ContextSupport support)
                             throws JaxenException

Returns true if any of the supplied nodes satisfy all the predicates in the set. Returns false if none of the supplied nodes matches all the predicates in the set. Returns false if the node-set is empty.

Parameters:

contextNodeSet - the nodes to test against these predicates

support - ????

Returns:

true if any node in the contextNodeSet matches all the predicates

Throws:

JaxenException

evaluatePredicates

protected List evaluatePredicates(List contextNodeSet,
                                  ContextSupport support)
                           throws JaxenException

Returns all of the supplied nodes that satisfy all the predicates in the set.

Parameters:

contextNodeSet - the nodes to test against these predicates

support - ????

Returns:

all the nodes that match each of the predicates

Throws:

JaxenException

applyPredicate

public List applyPredicate(Predicate predicate,
                           List nodes2Filter,
                           ContextSupport support)
                    throws JaxenException

Throws:

JaxenException