com.icl.saxon.expr
Class VariableReference
java.lang.Object
|
+--com.icl.saxon.expr.Expression
|
+--com.icl.saxon.expr.VariableReference
- public class VariableReference
- extends Expression
Variable reference: a reference to an XSL variable
Method Summary |
void |
display(int level)
Diagnostic print of expression structure |
Value |
evaluate(Context c)
Get the value of this variable in a given context. |
Binding |
getBinding()
Get the object bound to the variable |
int |
getDataType()
Determine the data type of the expression, if possible |
int |
getDependencies()
Determine which aspects of the context the expression depends on. |
Expression |
reduce(int dependencies,
Context context)
Perform a partial evaluation of the expression, by eliminating specified dependencies
on the context. |
Expression |
simplify()
Simplify the expression. |
Methods inherited from class com.icl.saxon.expr.Expression |
containsReferences, enumerate, evaluateAsBoolean, 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 |
VariableReference
public VariableReference(int fingerprint,
StaticContext staticContext)
throws XPathException
- Constructor
- Parameters:
name
- the variable name (as a Name object)
getDependencies
public int getDependencies()
- Determine which aspects of the context the expression depends on. The result is
a bitwise-or'ed value composed from constants such as Context.VARIABLES and
Context.CURRENT_NODE
- Overrides:
getDependencies
in class Expression
reduce
public Expression reduce(int dependencies,
Context context)
throws XPathException
- Perform a partial evaluation of the expression, by eliminating specified dependencies
on the context.
- Overrides:
reduce
in class Expression
- Parameters:
dependencies
- The dependencies to be removedcontext
- The context to be used for the partial evaluation- Returns:
- a new expression that does not have any of the specified
dependencies
evaluate
public Value evaluate(Context c)
throws XPathException
- Get the value of this variable in a given context.
- Overrides:
evaluate
in class Expression
- Parameters:
context
- the Context which contains the relevant variable bindings- Returns:
- the value of the variable, if it is defined
getBinding
public Binding getBinding()
- Get the object bound to the variable
getDataType
public int getDataType()
- Determine the data type of the expression, if possible
- Overrides:
getDataType
in class Expression
- Returns:
- the type of the variable, if this can be determined statically;
otherwise Value.ANY (meaning not known in advance)
simplify
public Expression simplify()
- Simplify the expression. If the variable has a fixed value, the variable reference
will be replaced with that value.
- Overrides:
simplify
in class Expression
- Following copied from class:
com.icl.saxon.expr.Expression
- Returns:
- the simplified expression
display
public void display(int level)
- Diagnostic print of expression structure
- Overrides:
display
in class Expression