net.sf.saxon.functions
Class NormalizeSpace
java.lang.Object
net.sf.saxon.expr.ComputedExpression
net.sf.saxon.expr.FunctionCall
net.sf.saxon.functions.SystemFunction
net.sf.saxon.functions.NormalizeSpace
- All Implemented Interfaces:
- Serializable, SourceLocator, Container, Expression, InstructionInfoProvider
public class NormalizeSpace
- extends SystemFunction
Implement the XPath normalize-space() function
- See Also:
- Serialized Form
Methods inherited from class net.sf.saxon.functions.SystemFunction |
addContextDocumentArgument, checkArguments, computeCardinality, computeSpecialProperties, display, getDetails, getErrorCodeForTypeErrors, getItemType, getRequiredType, main, makeSystemFunction, setDetails, useContextItemAsDefault |
Methods inherited from class net.sf.saxon.expr.FunctionCall |
checkArgumentCount, getDisplayName, getFunctionNameCode, getNumberOfArguments, iterateSubExpressions, optimize, promote, setArguments, setFunctionNameCode, simplifyArguments, typeCheck |
Methods inherited from class net.sf.saxon.expr.ComputedExpression |
adoptChildExpression, checkPermittedContents, computeDependencies, computeStaticProperties, doPromotion, dynamicError, dynamicError, effectiveBooleanValue, evaluateAsString, getCardinality, getColumnNumber, getConstructType, getDependencies, getExecutable, getHostLanguage, getImplementationMethod, getInstructionInfo, getLineNumber, getLocationId, getLocationProvider, getParentExpression, getPublicId, getSlotsUsed, getSpecialProperties, getSystemId, hasBadParentPointer, iterate, markTailFunctionCalls, process, resetStaticProperties, setLocationId, setParentExpression, suppressValidation, typeError, typeError |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
NormalizeSpace
public NormalizeSpace()
simplify
public Expression simplify(StaticContext env)
throws XPathException
- Simplify and validate.
- Specified by:
simplify
in interface Expression
- Overrides:
simplify
in class FunctionCall
- Returns:
- the simplified expression
- Throws:
XPathException
- if an error is discovered during expression
rewriting
getIntrinsicDependencies
public int getIntrinsicDependencies()
- Determine the intrinsic dependencies of an expression, that is, those which are not derived
from the dependencies of its subexpressions. For example, position() has an intrinsic dependency
on the context position, while (position()+1) does not. The default implementation
of the method returns 0, indicating "no dependencies".
- Overrides:
getIntrinsicDependencies
in class ComputedExpression
- Returns:
- a set of bit-significant flags identifying the "intrinsic"
dependencies. The flags are documented in class net.sf.saxon.value.StaticProperty
preEvaluate
public Expression preEvaluate(StaticContext env)
throws XPathException
- Pre-evaluate a function at compile time. Functions that do not allow
pre-evaluation, or that need access to context information, can override this method.
- Overrides:
preEvaluate
in class FunctionCall
- Throws:
XPathException
evaluateItem
public Item evaluateItem(XPathContext c)
throws XPathException
- Evaluate in a general context
- Specified by:
evaluateItem
in interface Expression
- Overrides:
evaluateItem
in class ComputedExpression
- Parameters:
c
- The context in which the expression is to be evaluated
- Returns:
- the node or atomic value that results from evaluating the
expression; or null to indicate that the result is an empty
sequence
- Throws:
XPathException
- if any dynamic error occurs evaluating the
expression
normalize
public static CharSequence normalize(CharSequence s)
- The algorithm that does the work: it removes leading and trailing whitespace, and
replaces internal whitespace by a single space character. The code is optimized for
two special cases: where the string is all whitespace, and where it contains no spaces
at all (including the case where it is empty). In these two cases it avoids creating
a new object.