org.exist.xquery
Class LetExpr

java.lang.Object
  org.exist.xquery.AbstractExpression
      org.exist.xquery.BindingExpression
          org.exist.xquery.LetExpr

All Implemented Interfaces:

Expression, RewritableExpression

public class LetExpr
extends BindingExpression

Implements an XQuery let-expression.

Field Summary

Fields inherited from class org.exist.xquery.BindingExpression

actualReturnType, groupReturnExpr, groupSpecs, groupVarName, inputSequence, LOG, orderSpecs, POSITIONAL_VAR_TYPE, returnExpr, sequenceType, toGroupVarName, varName, whereExpr

Fields inherited from class org.exist.xquery.AbstractExpression

column, context, contextDocSet, contextId, line, unordered

Fields inherited from interface org.exist.xquery.Expression

DOT_TEST, EXPRESSION_ID_INVALID, IGNORE_CONTEXT, IN_NODE_CONSTRUCTOR, IN_PREDICATE, IN_UPDATE, IN_WHERE_CLAUSE, NEED_INDEX_INFO, NO_CONTEXT_ID, NON_STREAMABLE, POSITIONAL_PREDICATE, SINGLE_STEP_EXECUTION, UNORDERED, USE_TREE_TRAVERSAL

Constructor Summary

LetExpr(XQueryContext context)

Method Summary

void	accept(ExpressionVisitor visitor) Start traversing the expression tree using the specified ExpressionVisitor.
boolean	allowMixNodesInReturn()
void	analyze(AnalyzeContextInfo contextInfo, OrderSpec[] orderBy, GroupSpec[] groupBy)
void	dump(ExpressionDumper dumper) Write a diagnostic dump of the expression to the passed ExpressionDumper.
Sequence	eval(Sequence contextSequence, Item contextItem, Sequence resultSequence, GroupedValueSequenceTable groupedSequence)
int	returnsType() The static return type of the expression.
java.lang.String	toString()

Methods inherited from class org.exist.xquery.BindingExpression

analyze, applyWhereExpression, checkOrderSpecs, clearContext, eval, getDependencies, getInputSequence, getReturnExpression, getVariable, getWhereExpression, preselect, registerUpdateListener, replaceExpression, resetState, setContext, setGroupReturnExpr, setGroupSpecs, setGroupVariable, setInputSequence, setOrderSpecs, setReturnExpression, setSequenceType, setToGroupVariable, setVariable, setWhereExpression

Methods inherited from class org.exist.xquery.AbstractExpression

eval, getCardinality, getColumn, getContext, getContextDocSet, getContextId, getExpressionId, getLine, getParent, getPrimaryAxis, getSource, getSubExpression, getSubExpressionCount, match, needsReset, setASTNode, setContextDocSet, setContextId, setLocation, setPrimaryAxis, simplify

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

LetExpr

public LetExpr(XQueryContext context)

Method Detail

analyze

public void analyze(AnalyzeContextInfo contextInfo,
                    OrderSpec[] orderBy,
                    GroupSpec[] groupBy)
             throws XPathException

Specified by:

analyze in class BindingExpression

Throws:

XPathException

eval

public Sequence eval(Sequence contextSequence,
                     Item contextItem,
                     Sequence resultSequence,
                     GroupedValueSequenceTable groupedSequence)
              throws XPathException

Specified by:

eval in class BindingExpression

Throws:

XPathException

returnsType

public int returnsType()

Description copied from interface: Expression

The static return type of the expression. This method should return one of the type constants defined in class Type. If the return type cannot be determined statically, return Type.ITEM.

Specified by:

returnsType in interface Expression

Specified by:

returnsType in class AbstractExpression

dump

public void dump(ExpressionDumper dumper)

Description copied from interface: Expression

Write a diagnostic dump of the expression to the passed ExpressionDumper.

Parameters:

dumper - the expression dumper to write to

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

accept

public void accept(ExpressionVisitor visitor)

Description copied from interface: Expression

Start traversing the expression tree using the specified ExpressionVisitor.

Specified by:

accept in interface Expression

Overrides:

accept in class AbstractExpression

allowMixNodesInReturn

public boolean allowMixNodesInReturn()

Specified by:

allowMixNodesInReturn in interface Expression

Overrides:

allowMixNodesInReturn in class AbstractExpression