org.eigenbase.sql.fun
Class SqlCase

java.lang.Object
  org.eigenbase.sql.SqlNode
      org.eigenbase.sql.SqlCall
          org.eigenbase.sql.fun.SqlCase

All Implemented Interfaces:

Cloneable

public class SqlCase
extends SqlCall

A SqlCase is a node of a parse tree which represents a case statement. It warrants its own node type just because we have a lot of methods to put somewhere.

Since:

Mar 14, 2004

Version:

$Id: //open/dev/farrago/src/org/eigenbase/sql/fun/SqlCase.java#7 $

Author:

wael

Field Summary

static int	ELSE_OPERAND ELSE_OPERAND = 2
static int	THEN_OPERANDS THEN_OPERANDS = 1
static int	WHEN_OPERANDS WHEN_OPERANDS = 0

Fields inherited from class org.eigenbase.sql.SqlCall

operands

Fields inherited from class org.eigenbase.sql.SqlNode

emptyArray

Constructor Summary

SqlCase(SqlCaseOperator operator, SqlNode[] operands, SqlParserPos pos)
Creates a SqlCase expression.

Method Summary

SqlNode	getElseOperand()
SqlNodeList	getThenOperands()
SqlNodeList	getWhenOperands()

Methods inherited from class org.eigenbase.sql.SqlCall

accept, clone, equalsDeep, findValidOptions, getCallSignature, getFunctionQuantifier, getKind, getMonotonicity, getOperands, getOperator, isA, isCountStar, isExpanded, isName, setOperand, setOperator, unparse, validate

Methods inherited from class org.eigenbase.sql.SqlNode

clone, cloneArray, equalDeep, getParserPosition, toSqlString, toSqlString, toString, validateExpr

Methods inherited from class java.lang.Object

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

Field Detail

WHEN_OPERANDS

public static final int WHEN_OPERANDS

WHEN_OPERANDS = 0

See Also:

Constant Field Values

THEN_OPERANDS

public static final int THEN_OPERANDS

THEN_OPERANDS = 1

See Also:

Constant Field Values

ELSE_OPERAND

public static final int ELSE_OPERAND

ELSE_OPERAND = 2

See Also:

Constant Field Values

Constructor Detail

SqlCase

SqlCase(SqlCaseOperator operator,
        SqlNode[] operands,
        SqlParserPos pos)

Creates a SqlCase expression.

The operands are an array of SqlNodes where

• operands[0] is a SqlNodeList of all WHEN expressions
• operands[1] is a SqlNodeList of all THEN expressions
• operands[2] is a SqlNode representing the implicit or explicit ELSE expression

See WHEN_OPERANDS, THEN_OPERANDS, ELSE_OPERAND.

Method Detail

getWhenOperands

public SqlNodeList getWhenOperands()

getThenOperands

public SqlNodeList getThenOperands()

getElseOperand

public SqlNode getElseOperand()