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: Class ErrorExpression

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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