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java.lang.Objectnet.sf.saxon.expr.ComputedExpression
net.sf.saxon.expr.UnaryExpression
Unary Expression: an expression taking a single operand expression
Field Summary | |
protected Expression |
operand
|
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 | |
UnaryExpression(Expression p0)
|
Method Summary | |
int |
computeCardinality()
Determine the static cardinality. |
int |
computeSpecialProperties()
Get the static properties of this expression (other than its type). |
void |
display(int level,
java.io.PrintStream out,
Configuration config)
Diagnostic print of expression structure |
protected abstract java.lang.String |
displayOperator(Configuration config)
Give a string representation of the operator for use in diagnostics |
boolean |
equals(java.lang.Object other)
Is this expression the same as another expression? |
Expression |
getBaseExpression()
|
ItemType |
getItemType(TypeHierarchy th)
Determine the data type of the expression, if possible. |
int |
hashCode()
get HashCode for comparing two expressions. |
java.util.Iterator |
iterateSubExpressions()
Get the immediate subexpressions of this expression |
Expression |
optimize(Optimizer opt,
StaticContext env,
ItemType contextItemType)
Perform optimisation of an expression and its subexpressions. |
Expression |
promote(PromotionOffer offer)
Promote this expression if possible |
boolean |
replaceSubExpression(Expression original,
Expression replacement)
Replace one subexpression by a replacement subexpression |
Expression |
simplify(StaticContext env)
Simplify an expression |
Expression |
typeCheck(StaticContext env,
ItemType contextItemType)
Type-check the expression. |
Methods inherited from class java.lang.Object |
clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait |
Field Detail |
protected Expression operand
Constructor Detail |
public UnaryExpression(Expression p0)
Method Detail |
public Expression getBaseExpression()
public Expression simplify(StaticContext env) throws XPathException
simplify
in interface Expression
simplify
in class ComputedExpression
XPathException
- if an error is discovered during expression
rewritingpublic Expression typeCheck(StaticContext env, ItemType contextItemType) throws XPathException
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 Expression optimize(Optimizer opt, StaticContext env, ItemType contextItemType) throws XPathException
This method is called after all references to functions and variables have been resolved to the declaration of the function or variable, and after all type checking has been done.
opt
- the optimizer in use. This provides access to supporting functions; it also allows
different optimization strategies to be used in different circumstances.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
StaticError
- if an error is discovered during this phase
(typically a type error)
XPathException
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 boolean replaceSubExpression(Expression original, Expression replacement)
replaceSubExpression
in interface Container
replaceSubExpression
in class ComputedExpression
original
- the original subexpressionreplacement
- the replacement subexpression
public int computeSpecialProperties()
computeSpecialProperties
in class ComputedExpression
public int computeCardinality()
computeCardinality
in class ComputedExpression
public ItemType getItemType(TypeHierarchy th)
th
-
public boolean equals(java.lang.Object other)
public int hashCode()
public void display(int level, java.io.PrintStream out, Configuration config)
level
- indentation level for this expressionout
- Output destinationconfig
- protected abstract java.lang.String displayOperator(Configuration config)
config
-
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