Package net.sf.saxon.instruct
Class QuerySimpleContentConstructor
- java.lang.Object
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- net.sf.saxon.expr.Expression
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- net.sf.saxon.instruct.SimpleContentConstructor
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- net.sf.saxon.instruct.QuerySimpleContentConstructor
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- All Implemented Interfaces:
java.io.Serializable
,javax.xml.transform.SourceLocator
,LocationProvider
,SaxonLocator
,EvaluableItem
,SequenceIterable
,InstructionInfo
,org.xml.sax.Locator
public class QuerySimpleContentConstructor extends SimpleContentConstructor
This class implements the rules for an XQuery simple content constructor, which are used in constructing the string value of an attribute node, text node, comment node, etc, from the value of the select expression or the contained sequence constructor. These differ slightly from the XSLT rules implemented in the superclass - specifically, the sequence is simply atomized, whereas XSLT takes special steps to concatenate adjacent text nodes before inserting separators.- See Also:
- Serialized Form
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Field Summary
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Fields inherited from class net.sf.saxon.expr.Expression
EVALUATE_METHOD, ITERATE_METHOD, locationId, PROCESS_METHOD, staticProperties
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Constructor Summary
Constructors Constructor Description QuerySimpleContentConstructor(Expression select, Expression separator, boolean noNodeIfEmpty)
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description protected int
computeCardinality()
Compute the cardinality of the result of the expression.Expression
copy()
Copy an expression.Item
evaluateItem(XPathContext context)
Evaluate an expression as a single item.java.lang.CharSequence
expandChildren(XPathContext context)
Expand the stylesheet elements subordinate to this one, returning the result as a string.boolean
isNoNodeWhenEmpty()
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Methods inherited from class net.sf.saxon.instruct.SimpleContentConstructor
explain, getImplementationMethod, getItemType, getSelectExpression, getSeparatorExpression, isAtomic, isSingleton, iterateSubExpressions, optimize, promote, replaceSubExpression, simplify, typeCheck
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Methods inherited from class net.sf.saxon.expr.Expression
addToPathMap, adoptChildExpression, checkForUpdatingSubexpressions, checkPermittedContents, computeDependencies, computeSpecialProperties, computeStaticProperties, display, doPromotion, dynamicError, effectiveBooleanValue, evaluateAsString, evaluatePendingUpdates, explain, findParentOf, getCardinality, getColumnNumber, getColumnNumber, getConstructType, getContainer, getDependencies, getExecutable, getHostLanguage, 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, toString, typeError
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Constructor Detail
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QuerySimpleContentConstructor
public QuerySimpleContentConstructor(Expression select, Expression separator, boolean noNodeIfEmpty)
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Method Detail
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isNoNodeWhenEmpty
public boolean isNoNodeWhenEmpty()
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computeCardinality
protected int computeCardinality()
Compute the cardinality of the result of the expression.- Overrides:
computeCardinality
in classSimpleContentConstructor
- Returns:
- the cardinality, @link {StaticProperty.EXACTLY_ONE}
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copy
public Expression copy()
Copy an expression. This makes a deep copy.- Overrides:
copy
in classSimpleContentConstructor
- Returns:
- the copy of the original expression
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expandChildren
public java.lang.CharSequence expandChildren(XPathContext context) throws XPathException
Expand the stylesheet elements subordinate to this one, returning the result as a string. The expansion must not generate any element or attribute nodes.- Parameters:
context
- The dynamic context for the transformation- Throws:
XPathException
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evaluateItem
public Item evaluateItem(XPathContext context) throws XPathException
Evaluate an expression as a single item. This always returns either a single Item or null (denoting the empty sequence). No conversion is done. This method should not be used unless the static type of the expression is a subtype of "item" or "item?": that is, it should not be called if the expression may return a sequence. There is no guarantee that this condition will be detected.- Specified by:
evaluateItem
in interfaceEvaluableItem
- Overrides:
evaluateItem
in classSimpleContentConstructor
- Parameters:
context
- 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
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