QuerySimpleContentConstructor

java.lang.Object
- net.sf.saxon.expr.Expression
- - net.sf.saxon.instruct.SimpleContentConstructor
  - - net.sf.saxon.instruct.QuerySimpleContentConstructor

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

Field Summary
- Fields inherited from class net.sf.saxon.expr.Expression
  EVALUATE_METHOD, ITERATE_METHOD, locationId, PROCESS_METHOD, staticProperties

Constructor Summary

Constructors
Constructor	Description
`QuerySimpleContentConstructor(Expression select, Expression separator, boolean noNodeIfEmpty)`

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()`

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

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from class net.sf.saxon.instruct.SimpleContentConstructor
explain, getImplementationMethod, getItemType, getSelectExpression, getSeparatorExpression, isAtomic, isSingleton, iterateSubExpressions, optimize, promote, replaceSubExpression, simplify, typeCheck

- Constructor Detail
  - QuerySimpleContentConstructor
```
public QuerySimpleContentConstructor(Expression select,
                                     Expression separator,
                                     boolean noNodeIfEmpty)
```
- Method Detail
  - isNoNodeWhenEmpty
```
public boolean isNoNodeWhenEmpty()
```
  - computeCardinality
```
protected int computeCardinality()
```
    Compute the cardinality of the result of the expression.
    
    Overrides:
    
    computeCardinality in class SimpleContentConstructor
    
    Returns:
    
    the cardinality, @link {StaticProperty.EXACTLY_ONE}
  - copy
```
public Expression copy()
```
    Copy an expression. This makes a deep copy.
    
    Overrides:
    
    copy in class SimpleContentConstructor
    
    Returns:
    
    the copy of the original expression
  - 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
  - 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 interface EvaluableItem
    
    Overrides:
    
    evaluateItem in class SimpleContentConstructor
    
    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

Class QuerySimpleContentConstructor

Field Summary

Fields inherited from class net.sf.saxon.expr.Expression

Constructor Summary

Method Summary

Methods inherited from class net.sf.saxon.expr.Expression

Methods inherited from class java.lang.Object

Methods inherited from class net.sf.saxon.instruct.SimpleContentConstructor

Constructor Detail

QuerySimpleContentConstructor

Method Detail

isNoNodeWhenEmpty

computeCardinality

copy

expandChildren

evaluateItem