Package com.icl.saxon.expr
Class ErrorExpression
java.lang.Object
com.icl.saxon.expr.Expression
com.icl.saxon.expr.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
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Field Summary
Fields inherited from class com.icl.saxon.expr.Expression
staticContext
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Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptionvoid
display
(int level) Diagnostic print of expression structureEvaluate this expression.int
Determine the data type of the expression, if possibleint
Determine which aspects of the context the expression depends on.Perform a partial evaluation of the expression, by eliminating specified dependencies on the context.Methods inherited from class com.icl.saxon.expr.Expression
containsReferences, enumerate, evaluateAsBoolean, evaluateAsNodeSet, evaluateAsNumber, evaluateAsString, getStaticContext, indent, isContextDocumentNodeSet, make, outputStringValue, setStaticContext, simplify, usesCurrent
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Constructor Details
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ErrorExpression
Constructor- Parameters:
exception
- the error found when parsing this expression
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Method Details
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evaluate
Evaluate this expression. This always throws the exception registered when the expression was first parsed.- Specified by:
evaluate
in classExpression
- Parameters:
c
- The context in which the expression is to be evaluated- Returns:
- the value of the expression, evaluated in the current context
- Throws:
XPathException
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getDataType
public int getDataType()Determine the data type of the expression, if possible- Specified by:
getDataType
in classExpression
- Returns:
- Value.ANY (meaning not known in advance)
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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- Specified by:
getDependencies
in classExpression
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reduce
Perform a partial evaluation of the expression, by eliminating specified dependencies on the context.- Specified by:
reduce
in classExpression
- 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
- Throws:
XPathException
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display
public void display(int level) Diagnostic print of expression structure- Specified by:
display
in classExpression
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