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## net.sf.saxon.instruct
Class ElementCreator

    java.lang.Object
      net.sf.saxon.expr.ComputedExpression
          net.sf.saxon.instruct.Instruction
              net.sf.saxon.instruct.ParentNodeConstructor
                  net.sf.saxon.instruct.ElementCreator

All Implemented Interfaces:
  Container, Expression, InstructionInfoProvider, java.io.Serializable, javax.xml.transform.SourceLocator, TailCallReturner

Direct Known Subclasses:
  ComputedElement, Copy, FixedElement

public abstract class ElementCreator
extends ParentNodeConstructor

An instruction that creates an element node. There are two subtypes, FixedElement for use where the name is known statically, and Element where it is computed dynamically. To allow use in both XSLT and XQuery, the class acts both as an Instruction and as an Expression.

See Also:
  Serialized Form

Field Summary
`protected boolean` | `inheritNamespaces` The inheritNamespaces flag indicates that the namespace nodes on the element created by this instruction are to be inherited (copied) on the children of this element.

Fields inherited from class net.sf.saxon.instruct.ParentNodeConstructor
`content`

Fields inherited from class net.sf.saxon.expr.ComputedExpression
`locationId, staticProperties`

Fields inherited from interface net.sf.saxon.expr.Expression
`EVALUATE_METHOD, ITERATE_METHOD, PROCESS_METHOD`

Constructor Summary
`ElementCreator()`

Method Summary
`int` | `computeSpecialProperties()` Get the static properties of this expression (other than its type).
`Item` | `evaluateItem(XPathContext context)` Evaluate the constructor, returning the constructed element node.
`int[]` | `getActiveNamespaces()` Callback to get a list of the intrinsic namespaces that need to be generated for the element.
`int` | `getImplementationMethod()` An implementation of Expression must provide at least one of the methods evaluateItem(), iterate(), or process().
`ItemType` | `getItemType(TypeHierarchy th)` Get the item type of the value returned by this instruction
`abstract int` | `getNameCode(XPathContext context)`
`int` | `getValidationMode()` Get the validation mode for the constructed element
`protected abstract void` | `outputNamespaceNodes(XPathContext context, Receiver receiver)` Callback to output namespace nodes for the new element.
`TailCall` | `processLeavingTail(XPathContext context)` Evaluate the instruction to produce a new element node.
`void` | `setValidationMode(int mode)` Set the validation mode for the new element
`void` | `suppressValidation(int validationMode)` Suppress validation on contained element constructors, on the grounds that the parent element is already performing validation.

Methods inherited from class net.sf.saxon.instruct.ParentNodeConstructor
`createsNewNodes, getCardinality, getContentExpression, getSchemaType, getValidationAction, isLazyConstruction, isNamespaceSensitive, iterateSubExpressions, optimize, promoteInst, setContentExpression, setLazyConstruction, setSchemaType, simplify, typeCheck`

Methods inherited from class net.sf.saxon.instruct.Instruction
`appendItem, assembleParams, assembleTunnelParams, computeCardinality, dynamicError, evaluateAsString, getInstructionInfo, getInstructionNameCode, getSourceLocator, isXSLT, iterate, process, promote`

Methods inherited from class net.sf.saxon.expr.ComputedExpression
`adoptChildExpression, checkPermittedContents, computeDependencies, computeStaticProperties, doPromotion, dynamicError, dynamicError, effectiveBooleanValue, getColumnNumber, getConstructType, getDependencies, getExecutable, getIntrinsicDependencies, getLineNumber, getLocationId, getLocationProvider, getParentExpression, getPublicId, getSlotsUsed, getSpecialProperties, getSystemId, hasBadParentPointer, markTailFunctionCalls, resetStaticProperties, setLocationId, setParentExpression, typeError, typeError`

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

Methods inherited from interface javax.xml.transform.SourceLocator
`getColumnNumber, getLineNumber, getPublicId, getSystemId`

Methods inherited from interface net.sf.saxon.expr.Expression
`display`

Field Detail

### inheritNamespaces

    protected boolean inheritNamespaces

  The inheritNamespaces flag indicates that the namespace nodes on the element created by this instruction are to be inherited (copied) on the children of this element. That is, if this flag is false, the child elements must carry a namespace undeclaration for all the namespaces on the parent, unless they are redeclared in some way.

Constructor Detail

### ElementCreator

    public ElementCreator()

Method Detail

### getItemType

    public ItemType getItemType(TypeHierarchy th)

  Get the item type of the value returned by this instruction

  Specified by:
    `getItemType` in interface `Expression`
  Overrides:
    `getItemType` in class `Instruction`
  Parameters:
    `th` -
  Returns:
    the item type

### computeSpecialProperties

    public int computeSpecialProperties()

  Get the static properties of this expression (other than its type). The result is bit-signficant. These properties are used for optimizations. In general, if property bit is set, it is true, but if it is unset, the value is unknown.

  Overrides:
    `computeSpecialProperties` in class `Instruction`
  Returns:
    a set of flags indicating static properties of this expression

### setValidationMode

    public void setValidationMode(int mode)

  Set the validation mode for the new element

### getValidationMode

    public int getValidationMode()

  Get the validation mode for the constructed element

### suppressValidation

    public void suppressValidation(int validationMode)

  Suppress validation on contained element constructors, on the grounds that the parent element is already performing validation. The default implementation does nothing.

  Overrides:
    `suppressValidation` in class `ComputedExpression`

### getNameCode

    public abstract int getNameCode(XPathContext context)
                             throws XPathException

  Throws:
    `XPathException`

### outputNamespaceNodes

    protected abstract void outputNamespaceNodes(XPathContext context,
                                                 Receiver receiver)
                                          throws XPathException

  Callback to output namespace nodes for the new element.

  Parameters:
    `context` - The execution context
    `receiver` - the Receiver where the namespace nodes are to be written
  Throws:
    `XPathException`

### getActiveNamespaces

    public int[] getActiveNamespaces()
                              throws XPathException

  Callback to get a list of the intrinsic namespaces that need to be generated for the element. The result is an array of namespace codes, the codes either occupy the whole array or are terminated by a -1 entry. A result of null is equivalent to a zero-length array.

  Throws:
    `XPathException`

### 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. For instructions this is the process() method.

  Specified by:
    `getImplementationMethod` in interface `Expression`
  Overrides:
    `getImplementationMethod` in class `Instruction`

### processLeavingTail

    public TailCall processLeavingTail(XPathContext context)
                                throws XPathException

  Evaluate the instruction to produce a new element node. This method is typically used when there is a parent element or document in a result tree, to which the new element is added.

  Specified by:
    `processLeavingTail` in interface `TailCallReturner`
  Specified by:
    `processLeavingTail` in class `Instruction`
  Parameters:
    `context` -
  Returns:
    null (this instruction never returns a tail call)
  Throws:
    `XPathException`

### evaluateItem

    public Item evaluateItem(XPathContext context)
                      throws XPathException

  Evaluate the constructor, returning the constructed element node. If lazy construction mode is in effect, then an UnconstructedParent object is returned instead.

  Specified by:
    `evaluateItem` in interface `Expression`
  Overrides:
    `evaluateItem` in class `Instruction`
  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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