org.jaxen.expr

Class PredicateSet

Implemented Interfaces:
Serializable

public class PredicateSet
extends java.lang.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.

Field Summary

private List
predicates
private static long
serialVersionUID

Constructor Summary

PredicateSet()
Create a new empty predicate set.

Method Summary

void
addPredicate(Predicate predicate)
Add a predicate to the set.
private boolean
anyMatchingNode(List contextNodeSet, ContextSupport support)
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.

Field Details

predicates

private List predicates

serialVersionUID

private static final long serialVersionUID
Field Value:
-7166491740228977853L

Constructor Details

PredicateSet

public PredicateSet()
Create a new empty predicate set.

Method Details

addPredicate

public void addPredicate(Predicate predicate)
Add a predicate to the set.
Parameters:
predicate - the predicate to be inserted

anyMatchingNode

private boolean anyMatchingNode(List contextNodeSet,
                                ContextSupport support)
            throws JaxenException

applyPredicate

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

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 -

getPredicates

public List getPredicates()
Returns the list containing the predicates. This list is live, not a copy.
Returns:
a live list of predicates

getText

public String getText()
Returns the XPath string containing each of the predicates.
Returns:
the XPath string containing each of the predicates

simplify

public void simplify()
Simplify each of the predicates in the list.