net.sf.saxon.expr.instruct
Class Comment

java.lang.Object
  extended by net.sf.saxon.expr.Expression
      extended by net.sf.saxon.expr.instruct.Instruction
          extended by net.sf.saxon.expr.instruct.SimpleNodeConstructor
              extended by net.sf.saxon.expr.instruct.Comment
All Implemented Interfaces:
Serializable, SourceLocator, LocationProvider, SaxonLocator, EvaluableItem, TailCallReturner, SequenceIterable, InstructionInfo, Locator

public final class Comment
extends SimpleNodeConstructor

An instruction representing an xsl:comment element in the stylesheet.

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
EVALUATE_METHOD, EVENT_FEED_METHOD, ITEM_FEED_METHOD, ITERATE_METHOD, locationId, PROCESS_METHOD, PUSH_SELECTION, staticProperties, WATCH_METHOD
 
Constructor Summary
Comment()
          Construct the instruction
 
Method Summary
protected  String checkContent(String comment, XPathContext context)
          Check the content of the node, and adjust it if necessary
 Expression copy()
          Copy an expression.
 void explain(ExpressionPresenter out)
          Diagnostic print of expression structure.
 int getCardinality()
          Determine the static cardinality of the expression.
 int getInstructionNameCode()
          Get the instruction name, for diagnostics and tracing return the string "xsl:comment"
 ItemType getItemType(TypeHierarchy th)
          Get the item type of the items returned by evaluating this instruction
 void localTypeCheck(ExpressionVisitor visitor, ItemType 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.
 
Methods inherited from class net.sf.saxon.expr.instruct.SimpleNodeConstructor
computeCardinality, computeSpecialProperties, createsNewNodes, evaluateItem, evaluateNameCode, getContentExpression, iterate, iterateSubExpressions, optimize, processLeavingTail, promoteInst, replaceSubExpression, setSelect, simplify, 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, getIntrinsicDependencies, 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

Comment

public Comment()
Construct the instruction

Method Detail

getInstructionNameCode

public int getInstructionNameCode()
Get the instruction name, for diagnostics and tracing return the string "xsl:comment"

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)
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).

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

localTypeCheck

public void localTypeCheck(ExpressionVisitor visitor,
                           ItemType 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

processValue

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

checkContent

protected String checkContent(String comment,
                              XPathContext context)
                       throws XPathException
Check the content of the node, and adjust it if necessary

Overrides:
checkContent in class SimpleNodeConstructor
Parameters:
comment - the supplied content
context - the dynamic context
Returns:
the original content, unless adjustments are needed
Throws:
XPathException - if the content is invalid

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


Copyright (c) 2004-2010 Saxonica Limited. All rights reserved.