Package com.icl.saxon.expr
Class PositionRange
java.lang.Object
com.icl.saxon.expr.Expression
com.icl.saxon.expr.PositionRange
PositionRange: a boolean expression that tests whether the position() is
within a certain range. This expression can occur in any context but it is
optimized when it appears as a predicate (see FilterEnumerator)
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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 the expression in a given contextboolean
Evaluate the expression in a given contextint
Determine the data type of the expressionint
Get the dependenciesprotected int
Get the maximum positionprotected int
Get the minimum positionPerform a partial evaluation of the expression, by eliminating specified dependencies on the context.simplify()
Simplify an expressionMethods inherited from class com.icl.saxon.expr.Expression
containsReferences, enumerate, evaluateAsNodeSet, evaluateAsNumber, evaluateAsString, getStaticContext, indent, isContextDocumentNodeSet, make, outputStringValue, setStaticContext, usesCurrent
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Constructor Details
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PositionRange
public PositionRange(int min, int max) Create a position range
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Method Details
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simplify
Simplify an expression- Overrides:
simplify
in classExpression
- Returns:
- the simplified expression
- Throws:
XPathException
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evaluate
Evaluate the expression in a given context- Specified by:
evaluate
in classExpression
- Parameters:
c
- the given context for evaluation- Returns:
- a BooleanValue representing the result of the numeric comparison of the two operands
- Throws:
XPathException
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evaluateAsBoolean
Evaluate the expression in a given context- Overrides:
evaluateAsBoolean
in classExpression
- Parameters:
c
- the given context for evaluation- Returns:
- a boolean representing the result of the numeric comparison of the two operands
- Throws:
XPathException
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getDataType
public int getDataType()Determine the data type of the expression- Specified by:
getDataType
in classExpression
- Returns:
- Value.BOOLEAN
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getDependencies
public int getDependencies()Get the dependencies- 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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getMinPosition
protected int getMinPosition()Get the minimum position -
getMaxPosition
protected int getMaxPosition()Get the maximum position -
display
public void display(int level) Diagnostic print of expression structure- Specified by:
display
in classExpression
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