org.basex.query.expr

Class Catch

java.lang.Object

org.basex.data.ExprInfo

org.basex.query.expr.Expr

org.basex.query.expr.ParseExpr

org.basex.query.expr.Single

org.basex.query.expr.Catch

public final class Catch
extends Single

Catch clause.

Author:

BaseX Team 2005-12, BSD License, Christian Gruen

Nested Class Summary

Nested classes/interfaces inherited from class org.basex.query.expr.Expr

Expr.Use

Field Summary

Fields inherited from class org.basex.query.expr.Single

expr

Fields inherited from class org.basex.query.expr.ParseExpr

input, size, type

Constructor Summary

Constructors

Constructor and Description
Catch(InputInfo ii, QNm[] c, QueryContext ctx) Constructor.

Method Summary

Methods

Modifier and Type	Method and Description
Catch	comp(QueryContext ctx) Compiles and optimizes the expression, assigns data types and cardinalities.
int	prepare(QueryContext ctx) Prepares the catch construction.
java.lang.String	toString()
boolean	uses(Expr.Use u) Indicates if an expression uses the specified type or operation.

Methods inherited from class org.basex.query.expr.Single

count, plan, removable, remove

Methods inherited from class org.basex.query.expr.ParseExpr

checkBln, checkColl, checkCreate, checkCtx, checkDbl, checkDBNode, checkEStr, checkEStr, checkIO, checkItem, checkItr, checkItr, checkMap, checkNode, checkNoEmpty, checkStr, checkType, checkUp, checkUp, checkWrite, compBln, ebv, item, iter, optPre, preEval, size, test, type, value

Methods inherited from class org.basex.query.expr.Expr

addText, compEbv, hasFreeVars, indexAccessible, indexEquivalent, isEmpty, isFunction, isItem, isVacuous, isValue, iterable, markTailCalls, sameAs

Methods inherited from class org.basex.data.ExprInfo

description, info

Methods inherited from class java.lang.Object

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

Constructor Detail

Catch

public Catch(InputInfo ii,
     QNm[] c,
     QueryContext ctx)

Constructor.

Parameters:

ii - input info

c - supported error codes

ctx - query context

Method Detail

comp

public Catch comp(QueryContext ctx)
           throws QueryException

Description copied from class: Expr

Compiles and optimizes the expression, assigns data types and cardinalities.

Overrides:

comp in class Single

Parameters:

ctx - query context

Returns:

optimized expression

Throws:

QueryException - query exception

prepare

public int prepare(QueryContext ctx)

Prepares the catch construction.

Parameters:

ctx - query context

Returns:

number of variables

uses

public boolean uses(Expr.Use u)

Description copied from class: Expr

Indicates if an expression uses the specified type or operation. This method is called by numerous Expr.comp(org.basex.query.QueryContext) methods to test the properties of sub-expressions. It will return true as soon as at least one test is successful.

Overrides:

uses in class Single

Parameters:

u - type/operation to be found

Returns:

result of check

toString

public java.lang.String toString()

Specified by:

toString in class ExprInfo