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java.lang.Objectcom.icl.saxon.expr.Expression
com.icl.saxon.expr.NodeSetExpression
com.icl.saxon.expr.FilterExpression
A FilterExpression contains a base expression and a filter predicate, which may be an integer expression (positional filter), or a boolean expression (qualifier)
Field Summary |
Fields inherited from class com.icl.saxon.expr.Expression |
staticContext |
Constructor Summary | |
FilterExpression(Expression start,
Expression filter)
Constructor |
Method Summary | |
void |
display(int level)
Diagnostic print of expression structure |
NodeEnumeration |
enumerate(Context context,
boolean sort)
Evaluate the filter expression in a given context to return a Node Enumeration |
int |
getDependencies()
Determine which aspects of the context the expression depends on. |
boolean |
isContextDocumentNodeSet()
Determine, in the case of an expression whose data type is Value.NODESET, whether all the nodes in the node-set are guaranteed to come from the same document as the context node. |
Expression |
reduce(int dep,
Context context)
Perform a partial evaluation of the expression, by eliminating specified dependencies on the context. |
Expression |
simplify()
Simplify an expression |
Methods inherited from class com.icl.saxon.expr.NodeSetExpression |
evaluate, evaluateAsBoolean, evaluateAsNodeSet, evaluateAsString, getDataType, outputStringValue, selectFirst |
Methods inherited from class com.icl.saxon.expr.Expression |
containsReferences, evaluateAsNumber, getStaticContext, indent, make, setStaticContext, usesCurrent |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
public FilterExpression(Expression start, Expression filter)
start
- A node-set expression denoting the absolute or relative set of nodes from which the
navigation path should start.filter
- An expression defining the filter predicateMethod Detail |
public Expression simplify() throws XPathException
simplify
in class Expression
XPathException
public NodeEnumeration enumerate(Context context, boolean sort) throws XPathException
enumerate
in class NodeSetExpression
context
- the evaluation contextsort
- true if the result must be in document order
XPathException
public int getDependencies()
getDependencies
in class Expression
public Expression reduce(int dep, Context context) throws XPathException
reduce
in class Expression
dep
- The dependencies to be removedcontext
- The context to be used for the partial evaluation
XPathException
public boolean isContextDocumentNodeSet()
isContextDocumentNodeSet
in class Expression
public void display(int level)
display
in class Expression
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