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java.lang.Objectnet.sf.saxon.expr.ComputedExpression
net.sf.saxon.expr.SimpleMappingExpression
A simple mapping expression is an expression A/B where B has a static type that is an atomic type. For example, * / name().
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 | |
SimpleMappingExpression(Expression start,
Expression step,
boolean isHybrid)
Constructor |
Method Summary | |
Expression |
analyze(StaticContext env,
ItemType contextItemType)
Type-check the expression |
int |
computeCardinality()
Determine the static cardinality of the expression |
int |
computeDependencies()
Determine which aspects of the context the expression depends on. |
int |
computeSpecialProperties()
Get the static properties of this expression (other than its type). |
void |
display(int level,
NamePool pool,
java.io.PrintStream out)
Diagnostic print of expression structure |
boolean |
equals(java.lang.Object other)
Is this expression the same as another expression? |
ItemType |
getItemType()
Determine the data type of the items returned by this exprssion |
Expression |
getStartExpression()
Get the start expression (the left-hand operand) |
Expression |
getStepExpression()
Get the step expression (the right-hand operand) |
int |
hashCode()
get HashCode for comparing two expressions |
SequenceIterator |
iterate(XPathContext context)
Iterate the path-expression in a given context |
java.util.Iterator |
iterateSubExpressions()
Get the immediate subexpressions of this expression |
java.lang.Object |
map(Item item,
XPathContext context,
java.lang.Object info)
Mapping function, from a node returned by the start iteration, to a sequence returned by the child. |
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 |
Constructor Detail |
public SimpleMappingExpression(Expression start, Expression step, boolean isHybrid)
start
- A node-set expression denoting the absolute or relative set of nodes from which the
navigation path should start.step
- The step to be followed from each node in the start expression to yield a new
node-setisHybrid
- if true, indicates that we don't know statically whether the step expression will
return nodes or atomic values. If false, we know it will return atomic values.Method Detail |
public Expression getStartExpression()
public Expression getStepExpression()
public final ItemType getItemType()
getItemType
in interface Expression
public Expression simplify(StaticContext env)
simplify
in interface Expression
simplify
in class ComputedExpression
public Expression analyze(StaticContext env, ItemType contextItemType)
analyze
in interface Expression
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 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
public int computeDependencies()
computeDependencies
in class ComputedExpression
public int computeSpecialProperties()
computeSpecialProperties
in class ComputedExpression
public int computeCardinality()
computeCardinality
in class ComputedExpression
public boolean equals(java.lang.Object other)
public int hashCode()
public SequenceIterator iterate(XPathContext context) throws XPathException
iterate
in interface Expression
iterate
in class ComputedExpression
context
- the evaluation context
XPathException
- if any dynamic error occurs evaluating the
expressionpublic java.lang.Object map(Item item, XPathContext context, java.lang.Object info) throws XPathException
map
in interface MappingFunction
item
- The item to be mapped.
If context is supplied, this must be the same as context.currentItem().context
- The processing context. This is supplied only for mapping constructs that
set the context node, position, and size. Otherwise it is null.info
- Arbitrary information supplied by the creator of the MappingIterator. It must be
read-only and immutable for the duration of the iteration.
XPathException
public void display(int level, NamePool pool, java.io.PrintStream out)
display
in interface Expression
level
- indentation level for this expressionpool
- NamePool used to expand any names appearing in the expressionout
- Output destination
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