Package net.sf.saxon.expr.instruct

Class Comment

java.lang.Object

net.sf.saxon.expr.Expression

net.sf.saxon.expr.instruct.Instruction

net.sf.saxon.expr.instruct.SimpleNodeConstructor

net.sf.saxon.expr.instruct.Comment

All Implemented Interfaces:

ExportAgent, TailCallReturner, Locatable, IdentityComparable, Traceable

public final class Comment
extends SimpleNodeConstructor

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

Field Summary

Fields inherited from class net.sf.saxon.expr.instruct.SimpleNodeConstructor

selectOp

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

EFFECTIVE_BOOLEAN_VALUE, EVALUATE_METHOD, ITEM_FEED_METHOD, ITERATE_METHOD, MAX_COST, MAX_SEQUENCE_LENGTH, MAX_STRING_LENGTH, PROCESS_METHOD, staticProperties, UNBOUNDED_LOWER, UNBOUNDED_UPPER, UPDATE_METHOD, WATCH_METHOD

Constructor Summary

Constructors

Constructor	Description
Comment()	Construct the instruction

Method Summary

Modifier and Type	Method	Description
protected UnicodeString	checkContent(UnicodeString comment, XPathContext context)	Check the content of the node, and adjust it if necessary
static UnicodeString	checkContentXQuery(UnicodeString comment)	Check the content of the comment according to the XQuery rules (which throw an error if it is wrong)
static UnicodeString	checkContentXSLT(UnicodeString comment)	Check the content of the comment according to the XSLT rules (which fix it if it is wrong)
Expression	copy(RebindingMap rebindings)	Copy an expression.
void	export(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()	Get the item type of the items returned by evaluating this instruction
void	localTypeCheck(ExpressionVisitor visitor, ContextItemStaticInfo contextItemType)	Method to perform type-checking specific to the kind of instruction
void	processValue(UnicodeString value, Outputter output, XPathContext context)	Process the value of the node, to create the new node.

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

allowExtractingCommonSubexpressions, alwaysCreatesNewNodes, computeCardinality, computeSpecialProperties, evaluateItem, evaluateNodeName, getSelect, getStreamerName, isLocal, iterate, mayCreateNewNodes, operands, optimize, processLeavingTail, setSelect, typeCheck

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

assembleParams, assembleTunnelParams, dynamicError, evaluateAsString, getExpressionName, getImplementationMethod, getNetCost, getSourceLocator, isInstruction, isXSLT, process, someOperandCreatesNewNodes

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

addToPathMap, adoptChildExpression, checkedOperands, checkForUpdatingSubexpressions, checkPermittedContents, computeDependencies, computeHashCode, computeStaticProperties, dynamicError, effectiveBooleanValue, equals, evaluatePendingUpdates, explain, getConfiguration, getCost, getDependencies, getEvaluationMethod, getExtraProperty, getIntegerBounds, getInterpretedExpression, getIntrinsicDependencies, getLocalRetainedStaticContext, getLocation, getObjectName, getPackageData, getParentExpression, getProperties, getProperty, getRetainedStaticContext, getScopingExpression, getSlotsUsed, getSpecialProperties, getStaticBaseURI, getStaticBaseURIString, getStaticType, getStaticUType, getTracingTag, hasCompatibleStaticContext, hashCode, hasSpecialProperty, hasVariableBinding, identityHashCode, implementsStaticTypeCheck, isCallOn, isEqual, isIdentical, isLiftable, isMultiThreaded, isStaticPropertiesKnown, isSubtreeExpression, isUpdatingExpression, isVacuousExpression, markTailFunctionCalls, operandList, operandSparseList, optimizeChildren, prepareForStreaming, resetLocalStaticProperties, restoreParentPointers, setEvaluationMethod, setExtraProperty, setFiltered, setFlattened, setLocation, setParentExpression, setRetainedStaticContext, setRetainedStaticContextLocally, setRetainedStaticContextThoroughly, setStaticProperty, simplify, simplifyChildren, staticTypeCheck, suppressValidation, toPattern, toShortString, toString, typeCheckChildren, typeError, unordered, verifyParentPointers

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface net.sf.saxon.trace.Traceable

gatherProperties

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()

Description copied from class: Instruction

Get the item type of the items returned by evaluating this instruction

Overrides:

getItemType in class Instruction

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(RebindingMap rebindings)

Copy an expression. This makes a deep copy.

Specified by:

copy in class Expression

Parameters:

rebindings - variables to be re-bound

Returns:

the copy of the original expression

localTypeCheck

public void localTypeCheck(ExpressionVisitor visitor,
                           ContextItemStaticInfo 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 - if a type error is detected

processValue

public void processValue(UnicodeString value,
                         Outputter output,
                         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

output - the destination for the result

context - the dynamic evaluation context

Throws:

XPathException - if a dynamic error occurs

checkContent

protected UnicodeString checkContent(UnicodeString 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

checkContentXSLT

public static UnicodeString checkContentXSLT(UnicodeString comment)

Check the content of the comment according to the XSLT rules (which fix it if it is wrong)

Parameters:

comment - the proposed text of the comment

Returns:

the adjusted text of the comment

checkContentXQuery

public static UnicodeString checkContentXQuery(UnicodeString comment)
                                        throws XPathException

Check the content of the comment according to the XQuery rules (which throw an error if it is wrong)

Parameters:

comment - the proposed text of the comment

Returns:

the adjusted text of the comment (always the same as the original if there is no error)

Throws:

XPathException - if the content is invalid

export

public void export(ExpressionPresenter out)
            throws XPathException

Diagnostic print of expression structure. The abstract expression tree is written to the supplied output destination.

Specified by:

export in interface ExportAgent

Specified by:

export in class Expression

Parameters:

out - the expression presenter used to display the structure

Throws:

XPathException - if the export fails, for example if an expression is found that won't work in the target environment.