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java.lang.Object | +--net.sf.saxon.expr.ComputedExpression | +--net.sf.saxon.expr.BinaryExpression | +--net.sf.saxon.expr.RangeExpression
A RangeExpression is an expression that represents an integer sequence as a pair of end-points (for example "x to y"). If the end-points are equal, the sequence is of length one.
From Saxon 7.8, the sequence must be ascending; if the end-point is less than the start-point, an empty sequence is returned. This is to allow expressions of the form "for $i in 1 to count($seq) return ...."
Nested Class Summary | |
static class |
RangeExpression.RangeIterator
Iterator that produces numeric values in a monotonic sequence, ascending or descending |
Field Summary | |
protected Expression |
operand0
|
protected Expression |
operand1
|
protected int |
operator
|
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 | |
RangeExpression(Expression start,
int op,
Expression end)
Construct a RangeExpression |
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 |
protected java.lang.String |
displayOperator()
|
boolean |
equals(java.lang.Object other)
Is this expression the same as another expression? |
ItemType |
getItemType()
Get the data type of the items returned |
int |
hashCode()
get HashCode for comparing two expressions. |
protected static boolean |
isCommutative(int operator)
|
SequenceIterator |
iterate(XPathContext context)
Return an iteration over the sequence |
java.util.Iterator |
iterateSubExpressions()
Get the immediate subexpressions of this expression |
Expression |
promote(PromotionOffer offer)
Promote this expression if possible |
Expression |
simplify(StaticContext env)
Simplify an expression |
Methods inherited from class java.lang.Object |
clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait |
Field Detail |
protected Expression operand0
protected Expression operand1
protected int operator
Constructor Detail |
public RangeExpression(Expression start, int op, Expression end)
Method Detail |
public Expression analyze(StaticContext env, ItemType contextItemType) throws XPathException
analyze
in interface Expression
analyze
in class net.sf.saxon.expr.BinaryExpression
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
XPathException
public ItemType getItemType()
public int computeCardinality()
computeCardinality
in class net.sf.saxon.expr.BinaryExpression
public SequenceIterator iterate(XPathContext context) throws XPathException
iterate
in interface Expression
iterate
in class ComputedExpression
context
- supplies the context for evaluation
XPathException
- if any dynamic error occurs evaluating the
expressionpublic Expression simplify(StaticContext env) throws XPathException
simplify
in interface Expression
simplify
in class ComputedExpression
XPathException
- if an error is discovered during expression
rewritingpublic Expression promote(PromotionOffer offer) throws XPathException
promote
in interface Expression
promote
in class ComputedExpression
offer
- details of the offer, for example the offer to move
expressions that don't depend on the context to an outer level in
the containing expression
XPathException
- if any error is detectedpublic java.util.Iterator iterateSubExpressions()
iterateSubExpressions
in interface Expression
iterateSubExpressions
in class ComputedExpression
protected static boolean isCommutative(int operator)
public boolean equals(java.lang.Object other)
equals
in class java.lang.Object
public int hashCode()
hashCode
in class java.lang.Object
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 destinationprotected java.lang.String displayOperator()
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