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: Class ErrorExpression

com.icl.saxon.expr
Class ErrorExpression


java.lang.Object

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  +--com.icl.saxon.expr.Expression

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        +--com.icl.saxon.expr.ErrorExpression


public class ErrorExpression
extends Expression

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


Fields inherited from class com.icl.saxon.expr.Expression
staticContext
 
Constructor Summary
ErrorExpression(XPathException exception)
          Constructor
 
Method Summary
 void display(int level)
          Diagnostic print of expression structure
 Value evaluate(Context c)
          Evaluate this expression.
 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.
 
Methods inherited from class com.icl.saxon.expr.Expression
containsReferences, enumerate, evaluateAsBoolean, evaluateAsNodeSet, evaluateAsNumber, evaluateAsString, getStaticContext, indent, isContextDocumentNodeSet, make, outputStringValue, setStaticContext, simplify, usesCurrent
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

ErrorExpression


public ErrorExpression(XPathException exception)
Constructor
Parameters:
exception - the error found when parsing this expression
Method Detail

evaluate


public Value evaluate(Context c)
               throws XPathException
Evaluate this expression. This always throws the exception registered when the expression was first parsed.
Overrides:
evaluate in class Expression
Following copied from class: com.icl.saxon.expr.Expression
Parameters:
context - The context in which the expression is to be evaluated
Returns:
the value of the expression, evaluated in the current context

getDataType


public int getDataType()
Determine the data type of the expression, if possible
Overrides:
getDataType in class Expression
Returns:
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
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 removed
context - The context to be used for the partial evaluation
Returns:
a new expression that does not have any of the specified dependencies

display


public void display(int level)
Diagnostic print of expression structure
Overrides:
display in class Expression