|
|||||||
PREV CLASS NEXT CLASS | FRAMES NO FRAMES | ||||||
SUMMARY: NESTED | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD |
java.lang.Objectorg.exist.xquery.AbstractExpression
org.exist.xquery.DynamicTypeCheck
public class DynamicTypeCheck
Check a function parameter type at runtime.
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 | |
---|---|
DynamicTypeCheck(XQueryContext context,
int requiredType,
Expression expr)
|
Method Summary | |
---|---|
void |
accept(ExpressionVisitor visitor)
Start traversing the expression tree using the specified ExpressionVisitor . |
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. |
XQueryAST |
getASTNode()
Returns the XQueryAST node from which this expression
has been constructed by the parser. |
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)
|
java.lang.String |
toString()
|
Methods inherited from class org.exist.xquery.AbstractExpression |
---|
eval, getCardinality, getContextDocSet, getContextId, getExpressionId, setASTNode, setPrimaryAxis |
Methods inherited from class java.lang.Object |
---|
equals, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Constructor Detail |
---|
public DynamicTypeCheck(XQueryContext context, int requiredType, Expression expr)
Method Detail |
---|
public void analyze(AnalyzeContextInfo contextInfo) throws XPathException
Expression
XPathException
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
contextSequence
- the current context sequence.contextItem
- a single item, taken from context. This defines the item,
the expression should work on.
XPathException
public void dump(ExpressionDumper dumper)
Expression
ExpressionDumper
.
dumper
- the expression dumper to write topublic java.lang.String toString()
toString
in class java.lang.Object
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 void resetState()
Expression
resetState
in interface Expression
resetState
in class AbstractExpression
public void setContextDocSet(DocumentSet contextSet)
setContextDocSet
in interface Expression
setContextDocSet
in class AbstractExpression
public XQueryAST getASTNode()
Expression
XQueryAST
node from which this expression
has been constructed by the parser. This node contains location information
(line number and column) important for error reports.
getASTNode
in interface Expression
getASTNode
in class AbstractExpression
public void accept(ExpressionVisitor visitor)
Expression
ExpressionVisitor
.
accept
in interface Expression
accept
in class AbstractExpression
|
|||||||
PREV CLASS NEXT CLASS | FRAMES NO FRAMES | ||||||
SUMMARY: NESTED | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD |