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java.lang.Objectnet.sf.saxon.expr.ComputedExpression
net.sf.saxon.instruct.Instruction
net.sf.saxon.instruct.ForEachGroup
Handler for xsl:for-each-group elements in stylesheet. This is a new instruction defined in XSLT 2.0
Field Summary | |
static int |
GROUP_ADJACENT
|
static int |
GROUP_BY
|
static int |
GROUP_ENDING
|
static int |
GROUP_STARTING
|
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 | |
ForEachGroup(Expression select,
Expression action,
byte algorithm,
Expression key,
java.util.Comparator collator,
SortKeyDefinition[] sortKeys)
|
Method Summary | |
Expression |
analyze(StaticContext env,
ItemType contextItemType)
Perform static analysis of an expression and its subexpressions. |
void |
checkPermittedContents(SchemaType parentType,
StaticContext env,
boolean whole)
Check that any elements and attributes constructed or returned by this expression are acceptable in the content model of a given complex type. |
int |
computeDependencies()
Compute the dependencies of an expression, as the union of the dependencies of its subexpressions. |
boolean |
createsNewNodes()
Determine whether this instruction creates new nodes. |
void |
display(int level,
NamePool pool,
java.io.PrintStream out)
Diagnostic print of expression structure. |
Expression |
getActionExpression()
Get the action expression (the content of the for-each) |
int |
getInstructionNameCode()
Get the name of this instruction for diagnostic and tracing purposes |
ItemType |
getItemType()
Get the item type of the items returned by evaluating this instruction |
SequenceIterator |
iterate(XPathContext context)
Return an Iterator to iterate over the values of a sequence. |
java.util.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) |
java.lang.Object |
map(Item item,
XPathContext context,
java.lang.Object info)
Map one item to a sequence. |
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. |
Expression |
simplify(StaticContext env)
Simplify an expression. |
Methods inherited from class net.sf.saxon.instruct.Instruction |
appendItem, assembleParams, assembleTunnelParams, computeCardinality, computeSpecialProperties, dynamicError, dynamicError, effectiveBooleanValue, evaluateAsString, evaluateItem, getImplementationMethod, getInstructionInfo, getSourceLocator, isXSLT, process, promote |
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 |
Field Detail |
public static final int GROUP_BY
public static final int GROUP_ADJACENT
public static final int GROUP_STARTING
public static final int GROUP_ENDING
Constructor Detail |
public ForEachGroup(Expression select, Expression action, byte algorithm, Expression key, java.util.Comparator collator, SortKeyDefinition[] sortKeys)
Method Detail |
public int getInstructionNameCode()
getInstructionNameCode
in class Instruction
public Expression getActionExpression()
public Expression simplify(StaticContext env) throws XPathException
simplify
in interface Expression
simplify
in class Instruction
XPathException
- if an error is discovered during expression
rewritingpublic Expression analyze(StaticContext env, ItemType contextItemType) throws XPathException
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 will only be accurately known if they have been explicitly declared.
analyze
in interface Expression
analyze
in class Instruction
env
- the static context of the expression
XPathException
- if an error is discovered during this phase
(typically a type error)public ItemType getItemType()
getItemType
in interface Expression
getItemType
in class Instruction
public int computeDependencies()
computeDependencies
in class ComputedExpression
public final boolean createsNewNodes()
createsNewNodes
in class Instruction
protected void promoteInst(PromotionOffer offer) throws XPathException
promoteInst
in class Instruction
offer
- The type of rewrite being offered
XPathException
public java.util.Iterator iterateSubExpressions()
iterateSubExpressions
in interface Expression
iterateSubExpressions
in class ComputedExpression
public void checkPermittedContents(SchemaType parentType, StaticContext env, boolean whole) throws XPathException
checkPermittedContents
in interface Expression
checkPermittedContents
in class ComputedExpression
XPathException
public TailCall processLeavingTail(XPathContext context) throws XPathException
Instruction
processLeavingTail
in class Instruction
context
- The dynamic context of the transformation, giving access to the current node,
the current variables, etc.
XPathException
public SequenceIterator iterate(XPathContext context) throws XPathException
iterate
in interface Expression
iterate
in class Instruction
context
- supplies the context for evaluation
XPathException
- if any dynamic error occurs evaluating the
expressionpublic java.lang.Object map(Item item, XPathContext context, java.lang.Object info) throws XPathException
map
in interface MappingFunction
item
- The item to be mapped.
If context is supplied, this must be the same as context.currentItem().context
- The processing context. This is supplied only for mapping constructs that
set the context node, position, and size. Otherwise it is null.info
- Arbitrary information supplied by the creator of the MappingIterator. It must be
read-only and immutable for the duration of the iteration.
XPathException
public void display(int level, NamePool pool, java.io.PrintStream out)
display
in interface Expression
level
- indentation level for this expressionout
- pool
- NamePool used to expand any names appearing in the expression
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