net.sf.saxon.functions
public class Substring extends SystemFunction
operation
argument
EVALUATE_METHOD, ITERATE_METHOD, locationId, PROCESS_METHOD, staticProperties
Constructor and Description |
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Substring() |
Modifier and Type | Method and Description |
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Item |
evaluateItem(XPathContext context)
Evaluate the function
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static java.lang.CharSequence |
substring(StringValue sv,
NumericValue start)
Implement the substring function with two arguments.
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static java.lang.CharSequence |
substring(StringValue sv,
NumericValue start,
NumericValue len,
XPathContext context)
Implement the substring function with three arguments.
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addContextDocumentArgument, addDocToPathMap, checkArguments, computeCardinality, computeSpecialProperties, copy, getDetails, getErrorCodeForTypeErrors, getItemType, getRequiredType, makeSystemFunction, optimize, setDetails, useContextItemAsDefault
addExternalFunctionCallToPathMap, checkArgumentCount, equals, explain, getArguments, getDisplayName, getFunctionName, getNumberOfArguments, hashCode, iterateSubExpressions, preEvaluate, promote, replaceSubExpression, setArguments, setFunctionName, simplify, simplifyArguments, toString, typeCheck
addToPathMap, adoptChildExpression, checkForUpdatingSubexpressions, checkPermittedContents, computeDependencies, computeStaticProperties, display, doPromotion, dynamicError, effectiveBooleanValue, evaluateAsString, evaluatePendingUpdates, explain, findParentOf, getCardinality, getColumnNumber, getColumnNumber, getConstructType, getContainer, getDependencies, getExecutable, getHostLanguage, getImplementationMethod, getIntrinsicDependencies, getLineNumber, getLineNumber, getLocationId, getLocationProvider, getObjectName, getProperties, getProperty, getPublicId, getSlotsUsed, getSpecialProperties, getSystemId, getSystemId, hasLoopingSubexpression, implementsStaticTypeCheck, isUpdatingExpression, iterate, iterateEvents, markTailFunctionCalls, process, resetLocalStaticProperties, setContainer, setFiltered, setFlattened, setLocationId, staticTypeCheck, suppressValidation, typeError
public Item evaluateItem(XPathContext context) throws XPathException
evaluateItem
in interface EvaluableItem
evaluateItem
in class Expression
context
- The context in which the expression is to be evaluatedXPathException
- if any dynamic error occurs evaluating the
expressionpublic static java.lang.CharSequence substring(StringValue sv, NumericValue start)
sv
- the string valuestart
- the numeric offset (1-based) of the first character to be included in the result
(if not an integer, the XPath rules apply)public static java.lang.CharSequence substring(StringValue sv, NumericValue start, NumericValue len, XPathContext context)
sv
- the string valuestart
- the numeric offset (1-based) of the first character to be included in the result
(if not an integer, the XPath rules apply)len
- the length of the required substring (again, XPath rules apply)context
- the XPath dynamic context. Provided because some arithmetic computations require it