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java.lang.Objectorg.exist.xquery.AbstractExpression
org.exist.xquery.TypeswitchExpression
Implements the XQuery typeswitch construct.
Field Summary |
Fields inherited from interface org.exist.xquery.Expression |
DOT_TEST, EXPRESSION_ID_INVALID, IGNORE_CONTEXT, IN_PREDICATE, IN_UPDATE, IN_WHERE_CLAUSE, NO_CONTEXT_ID, SINGLE_STEP_EXECUTION |
Constructor Summary | |
TypeswitchExpression(XQueryContext context,
Expression operand)
|
Method Summary | |
void |
addCase(SequenceType type,
QName var,
Expression caseClause)
Add a case clause with a sequence type and an optional variable declaration. |
void |
analyze(AnalyzeContextInfo contextInfo)
Statically analyze the expression and its subexpressions. |
void |
dump(ExpressionDumper dumper)
Write a diagnostic dump of the expression to the passed ExpressionDumper . |
Sequence |
eval(Sequence contextSequence,
Item contextItem)
Evaluate the expression represented by this object. |
int |
getCardinality()
The default cardinality is Cardinality.EXACTLY_ONE . |
int |
getDependencies()
Returns Dependency.DEFAULT_DEPENDENCIES . |
void |
resetState()
Called to inform an expression that it should reset to its initial state. |
int |
returnsType()
The static return type of the expression. |
void |
setContextDocSet(DocumentSet contextSet)
|
void |
setDefault(QName var,
Expression defaultClause)
Set the default clause with an optional variable declaration. |
Methods inherited from class org.exist.xquery.AbstractExpression |
accept, eval, getASTNode, getContextDocSet, getContextId, getExpressionId, setASTNode, setPrimaryAxis |
Methods inherited from class java.lang.Object |
equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
public TypeswitchExpression(XQueryContext context, Expression operand)
Method Detail |
public void addCase(SequenceType type, QName var, Expression caseClause)
public void setDefault(QName var, Expression defaultClause)
public Sequence eval(Sequence contextSequence, Item contextItem) throws XPathException
Expression
Dependency.CONTEXT_ITEM
bit is set in the bit field returned by Expression.getDependencies()
, the eval method will
be called once for every item in the context sequence. The contextItem
parameter will be set to the current item. Otherwise, the eval method will only be called
once for the whole context sequence and contextItem will be null.
eXist tries to process the entire context set in one, single step whenever
possible. Thus, most classes only expect context to contain a list of
nodes which represents the current context of the expression.
The position() function in XPath is an example for an expression,
which requires both, context sequence and context item to be set.
The context sequence might be a node set, a sequence of atomic values or a single
node or atomic value.
eval
in interface Expression
eval
in class AbstractExpression
XPathException
public int returnsType()
Expression
Type
. If the return type cannot be determined
statically, return Type.ITEM.
returnsType
in interface Expression
returnsType
in class AbstractExpression
public int getDependencies()
AbstractExpression
Dependency.DEFAULT_DEPENDENCIES
.
getDependencies
in interface Expression
getDependencies
in class AbstractExpression
Expression.getDependencies()
public int getCardinality()
AbstractExpression
Cardinality.EXACTLY_ONE
.
getCardinality
in interface Expression
getCardinality
in class AbstractExpression
public void analyze(AnalyzeContextInfo contextInfo) throws XPathException
Expression
XPathException
public void setContextDocSet(DocumentSet contextSet)
setContextDocSet
in interface Expression
setContextDocSet
in class AbstractExpression
public void dump(ExpressionDumper dumper)
Expression
ExpressionDumper
.
dumper
- the expression dumper to write topublic void resetState()
Expression
resetState
in interface Expression
resetState
in class AbstractExpression
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