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java.lang.Objectorg.exist.xquery.AbstractExpression
org.exist.xquery.BindingExpression
Abstract superclass for the variable binding expressions "for" and "let".
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 | |
BindingExpression(XQueryContext context)
|
Method Summary | |
void |
analyze(AnalyzeContextInfo contextInfo)
Statically analyze the expression and its subexpressions. |
abstract void |
analyze(AnalyzeContextInfo contextInfo,
OrderSpec[] orderBy)
|
Sequence |
eval(Sequence contextSequence,
Item contextItem)
Evaluate the expression represented by this object. |
abstract Sequence |
eval(Sequence contextSequence,
Item contextItem,
Sequence resultSequence)
|
DocumentSet |
preselect(DocumentSet in_docs)
|
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 |
setInputSequence(Expression sequence)
|
void |
setOrderSpecs(OrderSpec[] specs)
|
void |
setReturnExpression(Expression expr)
|
void |
setSequenceType(SequenceType type)
Set the sequence type of the variable (as specified in the "as" clause). |
void |
setVariable(java.lang.String qname)
|
void |
setWhereExpression(Expression expr)
|
Methods inherited from class org.exist.xquery.AbstractExpression |
accept, eval, getASTNode, getCardinality, getContextDocSet, getContextId, getDependencies, getExpressionId, setASTNode, setContextDocSet, setPrimaryAxis |
Methods inherited from class java.lang.Object |
equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Methods inherited from interface org.exist.xquery.Expression |
dump |
Constructor Detail |
public BindingExpression(XQueryContext context)
Method Detail |
public void setVariable(java.lang.String qname)
public void setSequenceType(SequenceType type)
type
- public void setInputSequence(Expression sequence)
public void setReturnExpression(Expression expr)
public void setWhereExpression(Expression expr)
public void setOrderSpecs(OrderSpec[] specs)
public void analyze(AnalyzeContextInfo contextInfo) throws XPathException
Expression
XPathException
public abstract void analyze(AnalyzeContextInfo contextInfo, OrderSpec[] orderBy) throws XPathException
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
XPathException
public abstract Sequence eval(Sequence contextSequence, Item contextItem, Sequence resultSequence) throws XPathException
XPathException
public DocumentSet preselect(DocumentSet in_docs) throws XPathException
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 void resetState()
Expression
resetState
in interface Expression
resetState
in class AbstractExpression
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