org.basex.query.expr
Class Union
java.lang.Object
org.basex.data.ExprInfo
org.basex.query.expr.Expr
org.basex.query.expr.ParseExpr
org.basex.query.expr.Arr
org.basex.query.expr.Union
public final class Union
- extends Arr
Union expression.
- Author:
- BaseX Team 2005-12, BSD License, Christian Gruen
Nested classes/interfaces inherited from class org.basex.query.expr.Expr |
Expr.Flag |
Fields inherited from class org.basex.query.expr.Arr |
expr |
Methods inherited from class org.basex.query.expr.Arr |
accept, allAreValues, checkNoUp, checkUp, copyAll, count, exprSize, has, indexEquivalent, inline, plan, removable, toString |
Methods inherited from class org.basex.query.expr.ParseExpr |
checkAdmin, checkAllUp, checkBinary, checkBln, checkColl, checkCreate, checkCtx, checkDbl, checkDBNode, checkEStr, checkEStr, checkFunc, checkItem, checkItr, checkItr, checkMap, checkNode, checkNode, checkNode, checkNoEmpty, checkNoneUp, checkNoUp, checkQNm, checkStr, checkStr, checkStrBin, checkType, checkWrite, compBln, copyType, ebv, item, optPre, preEval, size, test, type, value |
Methods inherited from class org.basex.query.expr.Expr |
addText, compEbv, copy, hasFreeVars, indexAccessible, inlineAll, isEmpty, isFunction, isItem, isVacuous, isValue, markTailCalls, optimize, sameAs, uses, visitAll |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Union
public Union(InputInfo ii,
Expr... e)
- Constructor.
- Parameters:
ii
- input infoe
- expression list
compile
public Expr compile(QueryContext ctx,
VarScope scp)
throws QueryException
- Description copied from class:
Expr
- Compiles and optimizes the expression, assigns data types and cardinalities.
- Parameters:
ctx
- query contextscp
- variable scope
- Returns:
- optimized expression
- Throws:
QueryException
- query exception
copy
public Expr copy(QueryContext ctx,
VarScope scp,
IntObjMap<Var> vs)
- Description copied from class:
Expr
- Copies an expression.
Will be useful for inlining functions, or for copying static queries.
- Specified by:
copy
in class Expr
- Parameters:
ctx
- query contextscp
- variable scope for creating new variablesvs
- mapping from old variable IDs to new variable copies
- Returns:
- copied expression
eval
protected NodeSeqBuilder eval(Iter[] iter)
throws QueryException
- Evaluates the specified iterators.
- Parameters:
iter
- iterators
- Returns:
- resulting iterator
- Throws:
QueryException
- query exception
iter
protected NodeIter iter(Iter[] iter)
- Evaluates the specified iterators in an iterative manner.
- Parameters:
iter
- iterators
- Returns:
- resulting iterator
iter
public final NodeIter iter(QueryContext ctx)
throws QueryException
- Description copied from class:
Expr
- Evaluates the expression and returns an iterator on the resulting items.
If this method is not overwritten,
Expr.item(org.basex.query.QueryContext, org.basex.util.InputInfo)
must be implemented
by an expression, as it may be called by this method.
- Overrides:
iter
in class ParseExpr
- Parameters:
ctx
- query context
- Returns:
- resulting item
- Throws:
QueryException
- query exception
iterable
public boolean iterable()
- Description copied from class:
Expr
- Returns true if the expression is iterable, i.e., if it will not contain any
duplicate nodes and if all nodes will be are sorted. The return value of this method
is only relevant for node sequences. It is e.g. called by
AxisPath
.
- Overrides:
iterable
in class Expr
- Returns:
- result of check
toString
public final java.lang.String toString()
- Specified by:
toString
in class ExprInfo