com.icl.saxon.expr
Class ErrorExpression
public class ErrorExpression
Error expression: this expression is generated when the supplied expression cannot be
parsed, and the containing element enables forwards-compatible processing. It defers
the generation of an error message until an attempt is made to evaluate the expression
void | display(int level) - Diagnostic print of expression structure
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Value | evaluate(Context c) - Evaluate this expression.
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int | getDataType() - Determine the data type of the expression, if possible
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int | getDependencies() - Determine which aspects of the context the expression depends on.
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Expression | reduce(int dependencies, Context context) - Perform a partial evaluation of the expression, by eliminating specified dependencies
on the context.
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containsReferences , display , enumerate , evaluate , evaluateAsBoolean , evaluateAsNodeSet , evaluateAsNumber , evaluateAsString , getDataType , getDependencies , getStaticContext , indent , isContextDocumentNodeSet , make , outputStringValue , reduce , setStaticContext , simplify , usesCurrent |
ErrorExpression
public ErrorExpression(XPathException exception)
Constructor
exception
- the error found when parsing this expression
display
public void display(int level)
Diagnostic print of expression structure
- display in interface Expression
evaluate
public Value evaluate(Context c)
throws XPathException
Evaluate this expression. This always throws the exception registered when the expression
was first parsed.
- evaluate in interface Expression
getDataType
public int getDataType()
Determine the data type of the expression, if possible
- getDataType in interface Expression
- Value.ANY (meaning not known in advance)
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
- getDependencies in interface 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.
- reduce in interface Expression
dependencies
- The dependencies to be removedcontext
- The context to be used for the partial evaluation
- a new expression that does not have any of the specified
dependencies