public abstract class CastingExpression extends UnaryExpression
Modifier and Type | Field and Description |
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protected Converter |
converter |
EFFECTIVE_BOOLEAN_VALUE, EVALUATE_METHOD, ITEM_FEED_METHOD, ITERATE_METHOD, MAX_SEQUENCE_LENGTH, MAX_STRING_LENGTH, PROCESS_METHOD, staticProperties, UNBOUNDED_LOWER, UNBOUNDED_UPPER, UPDATE_METHOD, WATCH_METHOD
Constructor and Description |
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CastingExpression(Expression source,
AtomicType target,
boolean allowEmpty)
Create a cast expression
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Modifier and Type | Method and Description |
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boolean |
allowsEmpty()
Ask whether the expression accepts an empty sequence as input (producing an empty sequence as output)
|
int |
computeSpecialProperties()
Determine the special properties of this expression
|
Converter |
getConverter()
Get the Converter allocated to implement this cast expression, if any
|
int |
getIntrinsicDependencies()
Get the expression's dependencies.
|
NamespaceResolver |
getNamespaceResolver()
Get the namespace resolver, if any
|
protected OperandRole |
getOperandRole()
Get the usage (in terms of streamability analysis) of the single operand
|
AtomicType |
getTargetPrimitiveType()
Get the primitive base type of the target type of the cast
|
AtomicType |
getTargetType()
Get the target type (the result type)
|
boolean |
isOperandIsStringLiteral()
Ask whether the operand to the cast expression was supplied in the form of a string literal.
|
void |
setAllowEmpty(boolean allow)
Say whether the expression accepts an empty sequence as input (producing an empty sequence as output)
|
void |
setOperandIsStringLiteral(boolean option)
Say whether the operand to the cast expression was supplied in the form of a string literal.
|
void |
setTargetType(AtomicType type)
Set the target type
|
Expression |
simplify()
Simplify the expression
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computeCardinality, computeHashCode, displayOperator, equals, export, getBaseExpression, getItemType, getOperand, operands, optimize, setBaseExpression, toShortString, toString, typeCheck
addToPathMap, adoptChildExpression, allowExtractingCommonSubexpressions, checkedOperands, checkForUpdatingSubexpressions, checkPermittedContents, computeDependencies, computeStaticProperties, copy, dynamicError, effectiveBooleanValue, evaluateAsString, evaluateItem, evaluatePendingUpdates, explain, getCardinality, getConfiguration, getConstructType, getCost, getDependencies, getEvaluationMethod, getExpressionName, getExtraProperty, getImplementationMethod, getIntegerBounds, getInterpretedExpression, getLocalRetainedStaticContext, getLocation, getNetCost, getObjectName, getPackageData, getParentExpression, getProperties, getProperty, getRetainedStaticContext, getScopingExpression, getSlotsUsed, getSpecialProperties, getStaticBaseURI, getStaticBaseURIString, getStaticType, getStaticUType, getStreamerName, hasCompatibleStaticContext, hashCode, hasVariableBinding, identityHashCode, implementsStaticTypeCheck, isCallOn, isCallOnSystemFunction, isIdentical, isInstruction, isLiftable, isMultiThreaded, isSameExpression, isStaticPropertiesKnown, isSubtreeExpression, isUpdatingExpression, isVacuousExpression, iterate, markTailFunctionCalls, operandList, operandSparseList, optimizeChildren, process, resetLocalStaticProperties, restoreParentPointers, setEvaluationMethod, setExtraProperty, setFiltered, setFlattened, setLocation, setParentExpression, setRetainedStaticContext, setRetainedStaticContextLocally, setRetainedStaticContextThoroughly, setStaticProperty, simplifyChildren, staticTypeCheck, suppressValidation, toPattern, typeCheckChildren, typeError, unordered, verifyParentPointers, verifyParentPointers
protected Converter converter
public CastingExpression(Expression source, AtomicType target, boolean allowEmpty)
source
- expression giving the value to be convertedtarget
- the type to which the value is to be convertedallowEmpty
- true if the expression allows an empty sequence as input, producing
an empty sequence as output. If false, an empty sequence is a type error.public AtomicType getTargetPrimitiveType()
public void setTargetType(AtomicType type)
type
- the target type for the castpublic AtomicType getTargetType()
protected OperandRole getOperandRole()
UnaryExpression
getOperandRole
in class UnaryExpression
public void setAllowEmpty(boolean allow)
allow
- true if an empty sequence is acceptedpublic boolean allowsEmpty()
public void setOperandIsStringLiteral(boolean option)
option
- true if the operand was supplied as a string literalpublic boolean isOperandIsStringLiteral()
public Converter getConverter()
public NamespaceResolver getNamespaceResolver()
public int getIntrinsicDependencies()
getIntrinsicDependencies
in class Expression
public Expression simplify() throws XPathException
simplify
in class Expression
XPathException
- if an error is discovered during expression
rewritingpublic int computeSpecialProperties()
computeSpecialProperties
in class UnaryExpression
StaticProperty.NON_CREATIVE
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