java.lang.Object
- net.sf.saxon.expr.Expression
- - net.sf.saxon.expr.UnaryExpression
  - - net.sf.saxon.expr.EmptyTextNodeRemover

All Implemented Interfaces:

ExportAgent, ItemMappingFunction, Locatable, IdentityComparable, Traceable
```
public class EmptyTextNodeRemover
extends UnaryExpression
implements ItemMappingFunction
```
This class performs part of the processing in "constructing simple content": it takes an input sequence and eliminates empty text nodes into one.

Since:

9.3

Field Summary
- Fields inherited from class net.sf.saxon.expr.Expression
  EFFECTIVE_BOOLEAN_VALUE, EVALUATE_METHOD, ITEM_FEED_METHOD, ITERATE_METHOD, MAX_COST, MAX_SEQUENCE_LENGTH, MAX_STRING_LENGTH, PROCESS_METHOD, staticProperties, UNBOUNDED_LOWER, UNBOUNDED_UPPER, UPDATE_METHOD, WATCH_METHOD

Constructor Summary

Constructors
Constructor Description

EmptyTextNodeRemover(Expression p0)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`protected int`	`computeCardinality()`	Determine the static cardinality.
`Expression`	`copy(RebindingMap rebindings)`	Copy an expression.
`java.lang.String`	`getExpressionName()`	Get a name identifying the kind of expression, in terms meaningful to a user.
`int`	`getImplementationMethod()`	An implementation of Expression must provide at least one of the methods evaluateItem(), iterate(), or process().
`ItemType`	`getItemType()`	Determine the data type of the expression, if possible.
`protected OperandRole`	`getOperandRole()`	Get the usage (in terms of streamability analysis) of the single operand
`java.lang.String`	`getStreamerName()`	Get the (partial) name of a class that supports streaming of this kind of expression
`SequenceIterator`	`iterate(XPathContext context)`	Return an Iterator to iterate over the values of a sequence.
`Item`	`mapItem(Item item)`	Map an item to another item

Methods inherited from class net.sf.saxon.expr.UnaryExpression
computeHashCode, computeSpecialProperties, displayOperator, emitExtraAttributes, equals, export, getBaseExpression, getOperand, operands, optimize, setBaseExpression, toShortString, toString, typeCheck

Methods inherited from class net.sf.saxon.expr.Expression
addToPathMap, adoptChildExpression, allowExtractingCommonSubexpressions, checkedOperands, checkForUpdatingSubexpressions, checkPermittedContents, computeDependencies, computeStaticProperties, dynamicError, effectiveBooleanValue, evaluateAsString, evaluateItem, evaluatePendingUpdates, explain, getCardinality, getConfiguration, getCost, getDependencies, getEvaluationMethod, getExtraProperty, getIntegerBounds, getInterpretedExpression, getIntrinsicDependencies, getLocalRetainedStaticContext, getLocation, getNetCost, getObjectName, getPackageData, getParentExpression, getProperties, getProperty, getRetainedStaticContext, getScopingExpression, getSlotsUsed, getSpecialProperties, getStaticBaseURI, getStaticBaseURIString, getStaticType, getStaticUType, getTracingTag, hasCompatibleStaticContext, hashCode, hasSpecialProperty, hasVariableBinding, identityHashCode, implementsStaticTypeCheck, isCallOn, isEqual, isIdentical, isInstruction, isLiftable, isMultiThreaded, isStaticPropertiesKnown, isSubtreeExpression, isUpdatingExpression, isVacuousExpression, markTailFunctionCalls, operandList, operandSparseList, optimizeChildren, prepareForStreaming, process, resetLocalStaticProperties, restoreParentPointers, setEvaluationMethod, setExtraProperty, setFiltered, setFlattened, setLocation, setParentExpression, setRetainedStaticContext, setRetainedStaticContextLocally, setRetainedStaticContextThoroughly, setStaticProperty, simplify, simplifyChildren, staticTypeCheck, suppressValidation, toPattern, typeCheckChildren, typeError, unordered, verifyParentPointers

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

Methods inherited from interface net.sf.saxon.trace.Traceable
gatherProperties

- Constructor Detail
  - EmptyTextNodeRemover
```
public EmptyTextNodeRemover(Expression p0)
```
- Method Detail
  - getItemType
```
public ItemType getItemType()
```
    Determine the data type of the expression, if possible. The default implementation for unary expressions returns the item type of the operand
    
    Overrides:
    
    getItemType in class UnaryExpression
    
    Returns:
    
    the item type of the items in the result sequence, insofar as this is known statically.
  - computeCardinality
```
protected int computeCardinality()
```
    Description copied from class: UnaryExpression
    
    Determine the static cardinality. Default implementation returns the cardinality of the operand
    
    Overrides:
    
    computeCardinality in class UnaryExpression
    
    Returns:
    
    the computed cardinality, as one of the values StaticProperty.ALLOWS_ZERO_OR_ONE, StaticProperty.EXACTLY_ONE, StaticProperty.ALLOWS_ONE_OR_MORE, StaticProperty.ALLOWS_ZERO_OR_MORE. May also return StaticProperty.ALLOWS_ZERO if the result is known to be an empty sequence, or StaticProperty.ALLOWS_MANY if if is known to return a sequence of length two or more.
  - getOperandRole
```
protected OperandRole getOperandRole()
```
    Description copied from class: UnaryExpression
    
    Get the usage (in terms of streamability analysis) of the single operand
    
    Specified by:
    
    getOperandRole in class UnaryExpression
    
    Returns:
    
    the operand usage
  - copy
```
public Expression copy(RebindingMap rebindings)
```
    Copy an expression. This makes a deep copy.
    
    Specified by:
    
    copy in class Expression
    
    Parameters:
    
    rebindings - variables that must be re-bound
    
    Returns:
    
    the copy of the original expression
  - getImplementationMethod
```
public int getImplementationMethod()
```
    An implementation of Expression must provide at least one of the methods evaluateItem(), iterate(), or process(). This method indicates which of these methods is prefered.
    
    Specified by:
    
    getImplementationMethod in class Expression
    
    Returns:
    
    the implementation method, for example Expression.ITERATE_METHOD or Expression.EVALUATE_METHOD or Expression.PROCESS_METHOD
  - iterate
```
public SequenceIterator iterate(XPathContext context)
                         throws XPathException
```
    Return an Iterator to iterate over the values of a sequence. The value of every expression can be regarded as a sequence, so this method is supported for all expressions. This default implementation handles iteration for expressions that return singleton values: for non-singleton expressions, the subclass must provide its own implementation.
    
    Overrides:
    
    iterate in class Expression
    
    Parameters:
    
    context - supplies the context for evaluation
    
    Returns:
    
    a SequenceIterator that can be used to iterate over the result of the expression
    
    Throws:
    
    XPathException - if any dynamic error occurs evaluating the expression
  - mapItem
```
public Item mapItem(Item item)
             throws XPathException
```
    Map an item to another item
    
    Specified by:
    
    mapItem in interface ItemMappingFunction
    
    Parameters:
    
    item - The input item to be mapped.
    
    Returns:
    
    the result of the mapping: maybe null
    
    Throws:
    
    XPathException - probably can't happen
  - getStreamerName
```
public java.lang.String getStreamerName()
```
    Get the (partial) name of a class that supports streaming of this kind of expression
    
    Overrides:
    
    getStreamerName in class Expression
    
    Returns:
    
    the partial name of a class that can be instantiated to provide streaming support in Saxon-EE, or null if there is no such class
  - getExpressionName
```
public java.lang.String getExpressionName()
```
    Description copied from class: Expression
    
    Get a name identifying the kind of expression, in terms meaningful to a user.
    
    Overrides:
    
    getExpressionName in class Expression
    
    Returns:
    
    a name identifying the kind of expression, in terms meaningful to a user. The name will always be in the form of a lexical XML QName, and should match the name used in export() output displaying the expression.

Class EmptyTextNodeRemover

Field Summary

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

Constructor Summary

Method Summary

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

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

Methods inherited from class java.lang.Object

Methods inherited from interface net.sf.saxon.trace.Traceable

Constructor Detail

EmptyTextNodeRemover

Method Detail

getItemType

computeCardinality

getOperandRole

copy

getImplementationMethod

iterate

mapItem

getStreamerName

getExpressionName