net.sf.saxon.instruct

Class ResultDocument

Implemented Interfaces:
SourceLocator, EvaluableItem, InstructionInfoProvider, SequenceIterable, Serializable, SourceLocator, TailCallReturner

public class ResultDocument
extends Instruction

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.

Field Summary

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

EVALUATE_METHOD, ITERATE_METHOD, PROCESS_METHOD, locationId, staticProperties

Constructor Summary

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

Method Summary

Expression
copy()
Copy an expression.
void
explain(ExpressionPresenter out)
Diagnostic print of expression structure.
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
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.
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
setContent(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, NameChecker checker)
Validate a serialization property and add its value to a Properties collection
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.instruct.Instruction

assembleParams, assembleTunnelParams, computeCardinality, computeSpecialProperties, createsNewNodes, dynamicError, evaluateAsString, evaluateItem, getImplementationMethod, getInstructionInfo, getInstructionNameCode, getItemType, getSourceLocator, isXSLT, iterate, process, processLeavingTail, promote, promoteInst, simplify

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

addToPathMap, adoptChildExpression, checkPermittedContents, computeCardinality, computeDependencies, computeSpecialProperties, computeStaticProperties, copy, display, doPromotion, dynamicError, effectiveBooleanValue, evaluateAsString, evaluateItem, explain, explain, findParentOf, getCardinality, getColumnNumber, getConstructType, getContainer, getDependencies, getExecutable, getHostLanguage, getImplementationMethod, getInstructionInfo, getIntrinsicDependencies, getItemType, getLineNumber, getLocationId, getLocationProvider, getPublicId, getSlotsUsed, getSpecialProperties, getSystemId, hasLoopingSubexpression, implementsStaticTypeCheck, iterate, iterateEvents, iterateSubExpressions, markTailFunctionCalls, optimize, process, promote, replaceSubExpression, resetLocalStaticProperties, setContainer, setFiltered, setFlattened, setLocationId, simplify, staticTypeCheck, suppressValidation, toString, typeCheck, typeError

Constructor Details

ResultDocument

public ResultDocument(Properties globalProperties,
                      Properties localProperties,
                      Expression href,
                      Expression formatExpression,
                      String baseURI,
                      int validationAction,
                      SchemaType schemaType,
                      IntHashMap 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 Details

copy

public Expression copy()
Copy an expression. This makes a deep copy.
Overrides:
copy in interface Expression
Returns:
the copy of the original expression

explain

public void explain(ExpressionPresenter out)
Diagnostic print of expression structure. The abstract expression tree is written to the supplied output destination.
Overrides:
explain in interface Expression

getInstructionNameCode

public int getInstructionNameCode()
Get the name of this instruction for diagnostic and tracing purposes (the string "xsl:result-document")
Overrides:
getInstructionNameCode in interface Instruction

getIntrinsicDependencies

public int getIntrinsicDependencies()
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 interface Expression
Returns:
a set of bit-significant flags identifying the "intrinsic" dependencies. The flags are documented in class net.sf.saxon.value.StaticProperty

getItemType

public ItemType getItemType(TypeHierarchy th)
Get the item type of the items returned by evaluating this instruction
Overrides:
getItemType in interface 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 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 interface Expression

optimize

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

processLeavingTail

public TailCall processLeavingTail(XPathContext context)
            throws XPathException
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
Overrides:
processLeavingTail in interface 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.

promoteInst

protected void promoteInst(PromotionOffer offer)
            throws XPathException
Handle promotion offers, that is, non-local tree rewrites.
Overrides:
promoteInst in interface Instruction
Parameters:
offer - The type of rewrite being offered
Throws:
XPathException -

replaceSubExpression

public boolean replaceSubExpression(Expression original,
                                    Expression replacement)
Replace one subexpression by a replacement subexpression
Overrides:
replaceSubExpression in interface Expression
Parameters:
original - the original subexpression
replacement - the replacement subexpression
Returns:
true if the original subexpression is found

setContent

public void setContent(Expression content)
Set the expression that constructs the content
Parameters:
content - the expression defining the content of the result document

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

setSerializationProperty

public static void setSerializationProperty(Properties details,
                                            String uri,
                                            String lname,
                                            String value,
                                            NamespaceResolver nsResolver,
                                            boolean prevalidated,
                                            NameChecker checker)
            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, Clark-format names otherwise
nsResolver - resolver for lexical QNames; not needed if prevalidated
prevalidated - true if values are already known to be valid and lexical QNames have been expanded into Clark notation
checker - the XML 1.0 or 1.1 name checker

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.
Overrides:
simplify in interface 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
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 parent pointer and 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 interface 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)