net.sf.saxon.expr.instruct
Class ResultDocument

java.lang.Object
  net.sf.saxon.expr.Expression
      net.sf.saxon.expr.instruct.Instruction
          net.sf.saxon.expr.instruct.ResultDocument

All Implemented Interfaces:

Serializable, SourceLocator, LocationProvider, SaxonLocator, EvaluableItem, DivisibleInstruction, TailCallReturner, SequenceIterable, InstructionInfo, Locator

public class ResultDocument
extends Instruction
implements DivisibleInstruction

The compiled form of an xsl:result-document element in the stylesheet.

The xsl:result-document element takes an attribute href="filename". The filename will often contain parameters, e.g. {position()} to ensure that a different file is produced for each element instance.

There is a further attribute "format" which determines the format of the output file, it identifies the name of an xsl:output element containing the output format details. In addition, individual serialization properties may be specified as attributes. These are attribute value templates, so they may need to be computed at run-time.

See Also:

Serialized Form

Field Summary

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

EVALUATE_METHOD, EVENT_FEED_METHOD, ITEM_FEED_METHOD, ITERATE_METHOD, locationId, PROCESS_METHOD, PUSH_SELECTION, staticProperties, WATCH_METHOD

Constructor Summary

ResultDocument(Properties globalProperties, Properties localProperties, Expression href, Expression formatExpression, String baseURI, int validationAction, SchemaType schemaType, IntHashMap<Expression> serializationAttributes, NamespaceResolver nsResolver)
Create a result-document instruction

Method Summary

Expression	copy() Copy an expression.
void	explain(ExpressionPresenter out) Diagnostic print of expression structure.
Expression	getContentExpression() Get the expression that constructs the content
int	getInstructionNameCode() Get the name of this instruction for diagnostic and tracing purposes (the string "xsl:result-document")
int	getIntrinsicDependencies() Determine the intrinsic dependencies of an expression, that is, those which are not derived from the dependencies of its subexpressions.
ItemType	getItemType(TypeHierarchy th) Get the item type of the items returned by evaluating this instruction
Iterator<Expression>	iterateSubExpressions() Get all the XPath expressions associated with this instruction (in XSLT terms, the expression present on attributes of the instruction, as distinct from the child instructions in a sequence construction)
Expression	optimize(ExpressionVisitor visitor, ItemType contextItemType) Perform optimisation of an expression and its subexpressions.
TailCall	processLeavingTail(XPathContext context) ProcessLeavingTail: called to do the real work of this instruction.
void	processLeft(Stack<XPathContext> contextStack, Stack state) In streaming mode, process the first half of the instruction (for example, to start a new document or element)
void	processRight(Stack<XPathContext> contextStack, Stack state) In streaming mode, process the right half of the instruction (for example, to end a new document or element)
static void	processXslOutputElement(NodeInfo element, Properties props, XPathContext c) Construct a set of output properties from an xsl:output element supplied at run-time
protected void	promoteInst(PromotionOffer offer) Handle promotion offers, that is, non-local tree rewrites.
boolean	replaceSubExpression(Expression original, Expression replacement) Replace one subexpression by a replacement subexpression
void	setContentExpression(Expression content) Set the expression that constructs the content
void	setDynamicOutputElement(Expression exp) Set an expression that evaluates to a run-time xsl:output element, used in the saxon:result-document() extension function designed for use in XQuery
static void	setSerializationProperty(Properties details, String uri, String lname, String value, NamespaceResolver nsResolver, boolean prevalidated, Configuration config) Validate a serialization property and add its value to a Properties collection
void	setUseStaticBaseUri(boolean staticBase) Set whether the the instruction should resolve the href relative URI against the static base URI (rather than the dynamic base output URI)
Expression	simplify(ExpressionVisitor visitor) Simplify an expression.
Expression	typeCheck(ExpressionVisitor visitor, ItemType contextItemType) Perform type checking of an expression and its subexpressions.

Methods inherited from class net.sf.saxon.expr.instruct.Instruction

assembleParams, assembleTunnelParams, computeCardinality, computeSpecialProperties, createsNewNodes, dynamicError, evaluateAsString, evaluateItem, getConstructType, getExpressionName, getImplementationMethod, getInstructionName, getIteratorFromProcessMethod, getSourceLocator, isXSLT, iterate, process, promote

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

addToPathMap, adoptChildExpression, checkForUpdatingSubexpressions, checkPermittedContents, computeDependencies, computeStaticProperties, doPromotion, dynamicError, effectiveBooleanValue, evaluatePendingUpdates, explain, getCardinality, getColumnNumber, getColumnNumber, getContainer, getDependencies, getEvaluationMethod, getExecutable, getHostLanguage, getLineNumber, getLineNumber, getLocationId, getLocationProvider, getObjectName, getProperties, getProperty, getPublicId, getSlotsUsed, getSpecialProperties, getSystemId, getSystemId, hasLoopingSubexpression, 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

ResultDocument

public ResultDocument(Properties globalProperties,
                      Properties localProperties,
                      Expression href,
                      Expression formatExpression,
                      String baseURI,
                      int validationAction,
                      SchemaType schemaType,
                      IntHashMap<Expression> serializationAttributes,
                      NamespaceResolver nsResolver)

Create a result-document instruction

Parameters:

globalProperties - properties defined on static xsl:output

localProperties - non-AVT properties defined on result-document element

href - href attribute of instruction

formatExpression - format attribute of instruction

baseURI - base URI of the instruction

validationAction - for example Validation.STRICT

schemaType - schema type against which output is to be validated

serializationAttributes - computed local properties

nsResolver - namespace resolver

Method Detail

setContentExpression

public void setContentExpression(Expression content)

Set the expression that constructs the content

Parameters:

content - the expression defining the content of the result document

getContentExpression

public Expression getContentExpression()

Get the expression that constructs the content

Specified by:

getContentExpression in interface DivisibleInstruction

Returns:

the content expression

setDynamicOutputElement

public void setDynamicOutputElement(Expression exp)

Set an expression that evaluates to a run-time xsl:output element, used in the saxon:result-document() extension function designed for use in XQuery

Parameters:

exp - the expression whose result should be an xsl:output element

setUseStaticBaseUri

public void setUseStaticBaseUri(boolean staticBase)

Set whether the the instruction should resolve the href relative URI against the static base URI (rather than the dynamic base output URI)

Parameters:

staticBase - set to true by fn:put(), to resolve against the static base URI of the query. Default is false, which causes resolution against the base output URI obtained dynamically from the Controller

simplify

public Expression simplify(ExpressionVisitor visitor)
                    throws XPathException

Simplify an expression. This performs any static optimization (by rewriting the expression as a different expression). The default implementation does nothing.

Specified by:

simplify in class Instruction

Parameters:

visitor - an expression visitor

Returns:

the simplified expression

Throws:

XPathException - if an error is discovered during expression rewriting

typeCheck

public Expression typeCheck(ExpressionVisitor visitor,
                            ItemType contextItemType)
                     throws XPathException

Description copied from class: Expression

Perform type checking of an expression and its subexpressions. This is the second phase of static optimization.

This checks statically that the operands of the expression have the correct type; if necessary it generates code to do run-time type checking or type conversion. A static type error is reported only if execution cannot possibly succeed, that is, if a run-time type error is inevitable. The call may return a modified form of the expression.

This method is called after all references to functions and variables have been resolved to the declaration of the function or variable. However, the types of such functions and variables may not be accurately known if they have not been explicitly declared.

If the implementation returns a value other than "this", then it is required to ensure that the location information in the returned expression have been set up correctly. It should not rely on the caller to do this, although for historical reasons many callers do so.

Overrides:

typeCheck in class Expression

Parameters:

visitor - an expression visitor

contextItemType - the static type of "." at the point where this expression is invoked. The parameter is set to null if it is known statically that the context item will be undefined. If the type of the context item is not known statically, the argument is set to Type.ITEM_TYPE

Returns:

the original expression, rewritten to perform necessary run-time type checks, and to perform other type-related optimizations

Throws:

XPathException - if an error is discovered during this phase (typically a type error)

optimize

public Expression optimize(ExpressionVisitor visitor,
                           ItemType contextItemType)
                    throws XPathException

Description copied from class: Expression

Perform optimisation of an expression and its subexpressions. This is the third and final phase of static optimization.

This method is called after all references to functions and variables have been resolved to the declaration of the function or variable, and after all type checking has been done.

Overrides:

optimize in class Expression

Parameters:

visitor - an expression visitor

contextItemType - the static type of "." at the point where this expression is invoked. The parameter is set to null if it is known statically that the context item will be undefined. If the type of the context item is not known statically, the argument is set to Type.ITEM_TYPE

Returns:

the original expression, rewritten if appropriate to optimize execution

Throws:

XPathException - if an error is discovered during this phase (typically a type error)

getIntrinsicDependencies

public int getIntrinsicDependencies()

Description copied from class: Expression

Determine the intrinsic dependencies of an expression, that is, those which are not derived from the dependencies of its subexpressions. For example, position() has an intrinsic dependency on the context position, while (position()+1) does not. The default implementation of the method returns 0, indicating "no dependencies".

Overrides:

getIntrinsicDependencies in class Expression

Returns:

a set of bit-significant flags identifying the "intrinsic" dependencies. The flags are documented in class net.sf.saxon.value.StaticProperty

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

promoteInst

protected void promoteInst(PromotionOffer offer)
                    throws XPathException

Handle promotion offers, that is, non-local tree rewrites.

Overrides:

promoteInst in class Instruction

Parameters:

offer - The type of rewrite being offered

Throws:

XPathException

getInstructionNameCode

public int getInstructionNameCode()

Get the name of this instruction for diagnostic and tracing purposes (the string "xsl:result-document")

Overrides:

getInstructionNameCode in class Instruction

Returns:

a code identifying the instruction: typically but not always the fingerprint of a name in the XSLT namespace

getItemType

public ItemType getItemType(TypeHierarchy th)

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. This is empty: the result-document instruction returns nothing.

iterateSubExpressions

public Iterator<Expression> iterateSubExpressions()

Get all the XPath expressions associated with this instruction (in XSLT terms, the expression present on attributes of the instruction, as distinct from the child instructions in a sequence construction)

Overrides:

iterateSubExpressions in class Expression

Returns:

an iterator containing the sub-expressions of this expression

replaceSubExpression

public boolean replaceSubExpression(Expression original,
                                    Expression replacement)

Replace one subexpression by a replacement subexpression

Overrides:

replaceSubExpression in class Expression

Parameters:

original - the original subexpression

replacement - the replacement subexpression

Returns:

true if the original subexpression is found

processLeavingTail

public TailCall processLeavingTail(XPathContext context)
                            throws XPathException

Description copied from class: Instruction

ProcessLeavingTail: called to do the real work of this instruction. This method must be implemented in each subclass. The results of the instruction are written to the current Receiver, which can be obtained via the Controller.

Specified by:

processLeavingTail in interface TailCallReturner

Specified by:

processLeavingTail in class Instruction

Parameters:

context - The dynamic context of the transformation, giving access to the current node, the current variables, etc.

Returns:

null if the instruction has completed execution; or a TailCall indicating a function call or template call that is delegated to the caller, to be made after the stack has been unwound so as to save stack space.

Throws:

XPathException

processLeft

public void processLeft(Stack<XPathContext> contextStack,
                        Stack state)
                 throws XPathException

In streaming mode, process the first half of the instruction (for example, to start a new document or element)

Specified by:

processLeft in interface DivisibleInstruction

Parameters:

contextStack - Stack of XPathContext objects. The instruction should use the one at the top of the stack. Some instructions (such as xsl:result-document) create a new context object and add it to the stack, removing it in the corresponding processRight() action.

state - a stack on which the instruction can save state information during the call on processLeft()

Throws:

XPathException

processRight

public void processRight(Stack<XPathContext> contextStack,
                         Stack state)
                  throws XPathException

In streaming mode, process the right half of the instruction (for example, to end a new document or element)

Specified by:

processRight in interface DivisibleInstruction

Parameters:

contextStack -

state - a stack on which the instruction can save state information during the call on processLeft()

Throws:

XPathException

setSerializationProperty

public static void setSerializationProperty(Properties details,
                                            String uri,
                                            String lname,
                                            String value,
                                            NamespaceResolver nsResolver,
                                            boolean prevalidated,
                                            Configuration config)
                                     throws XPathException

Validate a serialization property and add its value to a Properties collection

Parameters:

details - the properties to be updated

uri - the uri of the property name

lname - the local part of the property name

value - the value of the serialization property. In the case of QName-valued values, this will use lexical QNames if prevalidated is false and a NamespaceResolver is supplied; otherwise they will use Clark-format names

nsResolver - resolver for lexical QNames; not needed if prevalidated, or if QNames are supplied in Clark format

prevalidated - true if values are already known to be valid and lexical QNames have been expanded into Clark notation

config - the Saxon configuration

Throws:

XPathException - if any serialization property has an invalid value

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

processXslOutputElement

public static void processXslOutputElement(NodeInfo element,
                                           Properties props,
                                           XPathContext c)
                                    throws XPathException

Construct a set of output properties from an xsl:output element supplied at run-time

Parameters:

element - an xsl:output element

props - Properties object to which will be added the values of those serialization properties that were specified

c - the XPath dynamic context

Throws:

XPathException