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java.lang.Object | +--com.icl.saxon.expr.Expression | +--com.icl.saxon.expr.IsLastExpression
position()=last() expression
Fields inherited from class com.icl.saxon.expr.Expression |
staticContext |
Constructor Summary | |
IsLastExpression(boolean condition)
Construct a condition that tests position()=last (if condition is true) or position()!=last() (if condition is false). |
Method Summary | |
void |
display(int level)
Diagnostic print of expression structure |
Value |
evaluate(Context c)
Evaluate an expression. |
boolean |
evaluateAsBoolean(Context c)
Evaluate an expression as a Boolean. The result of x.evaluateAsBoolean(c) must be equivalent to x.evaluate(c).asBoolean(); but optimisations are possible when it is known that a boolean result is required, especially in the case of a NodeSet. |
int |
getDataType()
Determine the data type of the expression |
int |
getDependencies()
Get the dependencies of this expression on the context |
Expression |
reduce(int dependencies,
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.Expression |
containsReferences, enumerate, evaluateAsNodeSet, evaluateAsNumber, evaluateAsString, getStaticContext, indent, isContextDocumentNodeSet, make, outputStringValue, setStaticContext, usesCurrent |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
public IsLastExpression(boolean condition)
Method Detail |
public Expression simplify()
Expression
simplify
in class Expression
com.icl.saxon.expr.Expression
public Value evaluate(Context c) throws XPathException
Expression
evaluate
in class Expression
com.icl.saxon.expr.Expression
context
- The context in which the expression is to be evaluatedpublic boolean evaluateAsBoolean(Context c) throws XPathException
Expression
evaluateAsBoolean
in class Expression
com.icl.saxon.expr.Expression
context
- The context in which the expression is to be evaluatedpublic int getDataType()
getDataType
in class Expression
public int getDependencies()
getDependencies
in class Expression
public Expression reduce(int dependencies, Context context) throws XPathException
reduce
in class Expression
dependencies
- The dependencies to be removedcontext
- The context to be used for the partial evaluationpublic void display(int level)
display
in class Expression
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