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java.lang.Object | +--net.sf.saxon.expr.ComputedExpression | +--net.sf.saxon.expr.PositionRange
PositionRange: a boolean expression that tests whether the position() is within a certain range. This expression can occur in any context but it is optimized when it appears as a predicate (see FilterIterator)
Field Summary |
Fields inherited from class net.sf.saxon.expr.ComputedExpression |
locationId, staticProperties |
Fields inherited from interface net.sf.saxon.expr.Expression |
EVALUATE_METHOD, ITERATE_METHOD, PROCESS_METHOD |
Constructor Summary | |
PositionRange(int min,
int max)
Create a position range |
Method Summary | |
Expression |
analyze(StaticContext env,
ItemType contextItemType)
Type-check the expression |
int |
computeCardinality()
Determine the static cardinality |
void |
display(int level,
NamePool pool,
java.io.PrintStream out)
Diagnostic print of expression structure |
Item |
evaluateItem(XPathContext c)
Evaluate the expression |
int |
getIntrinsicDependencies()
Get the dependencies |
ItemType |
getItemType()
Determine the data type of the expression |
int |
getMaxPosition()
Get the maximum position |
int |
getMinPosition()
Get the minimum position |
Expression |
simplify(StaticContext env)
Simplify an expression |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
public PositionRange(int min, int max)
Method Detail |
public Expression simplify(StaticContext env) throws StaticError
simplify
in interface Expression
simplify
in class ComputedExpression
StaticError
public Expression analyze(StaticContext env, ItemType contextItemType)
env
- the static context of the expressioncontextItemType
- the static type of "." at the point where this expression is invoked.
The parameter is set to null if it is known statically that the context item will be undefined.
If the type of the context item is not known statically, the argument is set to
Type.ITEM_TYPE
public Item evaluateItem(XPathContext c) throws XPathException
evaluateItem
in interface Expression
evaluateItem
in class ComputedExpression
c
- The context in which the expression is to be evaluated
XPathException
- if any dynamic error occurs evaluating the
expressionpublic ItemType getItemType()
public int computeCardinality()
computeCardinality
in class ComputedExpression
public int getIntrinsicDependencies()
getIntrinsicDependencies
in class ComputedExpression
public int getMinPosition()
public int getMaxPosition()
public void display(int level, NamePool pool, java.io.PrintStream out)
level
- indentation level for this expressionpool
- NamePool used to expand any names appearing in the expressionout
- Output destination
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