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## net.sf.saxon.expr.instruct
Class NamespaceConstructor

    java.lang.Object
      net.sf.saxon.expr.Expression
          net.sf.saxon.expr.instruct.Instruction
              net.sf.saxon.expr.instruct.SimpleNodeConstructor
                  net.sf.saxon.expr.instruct.NamespaceConstructor

All Implemented Interfaces:
  Serializable, SourceLocator, LocationProvider, SaxonLocator, TailCallReturner, InstructionInfo, Locator

    public class NamespaceConstructor

extends SimpleNodeConstructor

A namespace constructor instruction. (xsl:namespace in XSLT 2.0, or namespace{}{} in XQuery 1.1)

See Also:
  Serialized Form

Field Summary

Fields inherited from class net.sf.saxon.expr.instruct.SimpleNodeConstructor
`select`

Fields inherited from class net.sf.saxon.expr.Expression
`EFFECTIVE_BOOLEAN_VALUE, EVALUATE_METHOD, EVENT_FEED_METHOD, ITEM_FEED_METHOD, ITERATE_METHOD, locationId, MAX_SEQUENCE_LENGTH, MAX_STRING_LENGTH, PROCESS_METHOD, PUSH_SELECTION, staticProperties, UNBOUNDED_LOWER, UNBOUNDED_UPPER, WATCH_METHOD`

Constructor Summary
`NamespaceConstructor(Expression name)` Create an xsl:namespace instruction for dynamic construction of namespace nodes

Method Summary
`Expression` | `copy()` Copy an expression.
`NodeInfo` | `evaluateItem(XPathContext context)` Evaluate as an expression.
`NodeName` | `evaluateNodeName(XPathContext context)` Run-time method to compute the name of the node being constructed.
`void` | `explain(ExpressionPresenter out)` Diagnostic print of expression structure.
`int` | `getCardinality()` Determine the static cardinality of the expression.
`int` | `getInstructionNameCode()` Set the name of this instruction for diagnostic and tracing purposes
`ItemType` | `getItemType(TypeHierarchy th)` Get the item type of the items returned by evaluating this instruction
`Expression` | `getNameExpression()` Get the expression that defines the namespace node's name
`Iterator<Expression>` | `iterateSubExpressions()` Get the immediate sub-expressions of this expression.
`void` | `localTypeCheck(ExpressionVisitor visitor, ExpressionVisitor.ContextItemType contextItemType)` Method to perform type-checking specific to the kind of instruction
`void` | `processValue(CharSequence value, XPathContext context)` Process the value of the node, to create the new node.
`protected void` | `promoteInst(PromotionOffer offer)` Offer promotion for subexpressions.
`boolean` | `replaceSubExpression(Expression original, Expression replacement)` Replace one subexpression by a replacement subexpression
`Expression` | `simplify(ExpressionVisitor visitor)` Simplify an expression.

Methods inherited from class net.sf.saxon.expr.instruct.SimpleNodeConstructor
`checkContent, computeCardinality, computeSpecialProperties, createsNewNodes, getContentExpression, iterate, optimize, processLeavingTail, setSelect, typeCheck`

Methods inherited from class net.sf.saxon.expr.instruct.Instruction
`assembleParams, assembleTunnelParams, dynamicError, evaluateAsString, getConstructType, getExpressionName, getImplementationMethod, getInstructionName, getIteratorFromProcessMethod, getSourceLocator, isXSLT, process, promote`

Methods inherited from class net.sf.saxon.expr.Expression
`addToPathMap, adoptChildExpression, checkForUpdatingSubexpressions, checkPermittedContents, computeDependencies, computeStaticProperties, doPromotion, dynamicError, effectiveBooleanValue, evaluatePendingUpdates, explain, getColumnNumber, getColumnNumber, getContainer, getDependencies, getEvaluationMethod, getExecutable, getHostLanguage, getIntegerBounds, getIntrinsicDependencies, getLineNumber, getLineNumber, getLocationId, getLocationProvider, getObjectName, getProperties, getProperty, getPublicId, getSlotsUsed, getSpecialProperties, getSystemId, getSystemId, hasLoopingSubexpression, hasVariableBinding, implementsStaticTypeCheck, isSubtreeExpression, isUpdatingExpression, isVacuousExpression, iterateEvents, iterateSameFocusSubExpressions, markTailFunctionCalls, resetLocalStaticProperties, setContainer, setEvaluationMethod, 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 interface javax.xml.transform.SourceLocator
`getColumnNumber, getLineNumber, getPublicId, getSystemId`

Constructor Detail

### NamespaceConstructor

    public NamespaceConstructor(Expression name)

  Create an xsl:namespace instruction for dynamic construction of namespace nodes

  Parameters:
    `name` - the expression to evaluate the name of the node (that is, the prefix)

Method Detail

### getNameExpression

    public Expression getNameExpression()

  Get the expression that defines the namespace node's name

  Returns:
    the expression that defines the namespace node's name (that is, the namespace prefix)

### getInstructionNameCode

    public int getInstructionNameCode()

  Set the name of this instruction for diagnostic and tracing purposes

  Overrides:
    `getInstructionNameCode` in class `Instruction`
  Returns:
    a code identifying the instruction: typically but not always the fingerprint of a name in the XSLT namespace

### simplify

    public Expression simplify(ExpressionVisitor visitor)
                        throws XPathException

  Description copied from class: `Instruction`
  Simplify an expression. This performs any static optimization (by rewriting the expression as a different expression). The default implementation does nothing.

  Overrides:
    `simplify` in class `SimpleNodeConstructor`
  Parameters:
    `visitor` - an expression visitor
  Returns:
    the simplified expression
  Throws:
    `XPathException` - if an error is discovered during expression rewriting

### getItemType

    public ItemType getItemType(TypeHierarchy th)

  Description copied from class: `Instruction`
  Get the item type of the items returned by evaluating this instruction

  Overrides:
    `getItemType` in class `Instruction`
  Parameters:
    `th` - the type hierarchy cache
  Returns:
    the static item type of the instruction

### getCardinality

    public int getCardinality()

  Description copied from class: `Expression`
  Determine the static cardinality of the expression. This establishes how many items there will be in the result of the expression, at compile time (i.e., without actually evaluating the result.

  Overrides:
    `getCardinality` in class `Expression`
  Returns:
    one of the values Cardinality.ONE_OR_MORE, Cardinality.ZERO_OR_MORE, Cardinality.EXACTLY_ONE, Cardinality.ZERO_OR_ONE, Cardinality.EMPTY. This default implementation returns ZERO_OR_MORE (which effectively gives no information).

### promoteInst

    protected void promoteInst(PromotionOffer offer)
                        throws XPathException

  Description copied from class: `SimpleNodeConstructor`
  Offer promotion for subexpressions. The offer will be accepted if the subexpression is not dependent on the factors (e.g. the context item) identified in the PromotionOffer. By default the offer is not accepted - this is appropriate in the case of simple expressions such as constant values and variable references where promotion would give no performance advantage. This method is always called at compile time.

  Overrides:
    `promoteInst` in class `SimpleNodeConstructor`
  Parameters:
    `offer` - details of the offer, for example the offer to move expressions that don't depend on the context to an outer level in the containing expression
  Throws:
    `XPathException` - if any error is detected

### localTypeCheck

    public void localTypeCheck(ExpressionVisitor visitor,
                               ExpressionVisitor.ContextItemType contextItemType)
                        throws XPathException

  Description copied from class: `SimpleNodeConstructor`
  Method to perform type-checking specific to the kind of instruction

  Specified by:
    `localTypeCheck` in class `SimpleNodeConstructor`
  Parameters:
    `visitor` - an expression visitor
    `contextItemType` - the static type of the context item
  Throws:
    `XPathException` - if a type error is detected

### iterateSubExpressions

    public Iterator<Expression> iterateSubExpressions()

  Description copied from class: `Expression`
  Get the immediate sub-expressions of this expression. Default implementation returns a zero-length array, appropriate for an expression that has no sub-expressions.

  Overrides:
    `iterateSubExpressions` in class `SimpleNodeConstructor`
  Returns:
    an iterator containing the sub-expressions of this expression

### copy

    public Expression copy()

  Copy an expression. This makes a deep copy.

  Specified by:
    `copy` in class `Expression`
  Returns:
    the copy of the original expression

### replaceSubExpression

    public boolean replaceSubExpression(Expression original,
                                        Expression replacement)

  Replace one subexpression by a replacement subexpression

  Overrides:
    `replaceSubExpression` in class `SimpleNodeConstructor`
  Parameters:
    `original` - the original subexpression
    `replacement` - the replacement subexpression
  Returns:
    true if the original subexpression is found

### evaluateNodeName

    public NodeName evaluateNodeName(XPathContext context)
                              throws XPathException

  Description copied from class: `SimpleNodeConstructor`
  Run-time method to compute the name of the node being constructed. This is overridden for nodes that have a name. The default implementation returns -1, which is suitable for unnamed nodes such as comments

  Overrides:
    `evaluateNodeName` in class `SimpleNodeConstructor`
  Parameters:
    `context` - the XPath dynamic evaluation context
  Returns:
    the name pool nameCode identifying the name of the constructed node
  Throws:
    `XPathException` - if any failure occurs

### processValue

    public void processValue(CharSequence value,
                             XPathContext context)
                      throws XPathException

  Description copied from class: `SimpleNodeConstructor`
  Process the value of the node, to create the new node.

  Specified by:
    `processValue` in class `SimpleNodeConstructor`
  Parameters:
    `value` - the string value of the new node
    `context` - the dynamic evaluation context
  Throws:
    `XPathException` - if a dynamic error occurs

### evaluateItem

    public NodeInfo evaluateItem(XPathContext context)
                          throws XPathException

  Evaluate as an expression. We rely on the fact that when these instructions are generated by XQuery, there will always be a valueExpression to evaluate the content

  Overrides:
    `evaluateItem` in class `SimpleNodeConstructor`
  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

### explain

    public void explain(ExpressionPresenter out)

  Diagnostic print of expression structure. The abstract expression tree is written to the supplied output destination.

  Specified by:
    `explain` in class `Expression`
  Parameters:
    `out` - the expression presenter used to display the structure

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Copyright (c) 2004-2011 Saxonica Limited. All rights reserved.