Package opendap.servers

Class Operator

java.lang.Object

opendap.servers.Operator

All Implemented Interfaces:

ExprParserConstants

public class Operator
extends Object
implements ExprParserConstants

This class contains the code for performing relative operations (RelOps) on BaseTypes. It contains one heavily overloaded method that is smart enough to figure out which actual BaseType were passed in and perform (if appropriate) the RelOp comparison on the 2 types.

Field Summary

Fields inherited from interface opendap.servers.parsers.ExprParserConstants

AMPERSAND, COLON, COMMA, DEFAULT, EOF, EQUAL, FLOATCONST, FUNCTION, GREATER, GREATER_EQL, INTCONST, LBRACE, LBRACKET, LESS, LESS_EQL, LPAREN, NOT_EQUAL, operatorImage, RBRACE, RBRACKET, REGEXP, RPAREN, SEPARATOR, STRINGCONST, tokenImage, VAR, WORD

Constructor Summary

Constructors

Constructor	Description
Operator()

Method Summary

Modifier and Type	Method	Description
static boolean	op(int oprtr, opendap.dap.BaseType lop, opendap.dap.BaseType rop)	Performs the Relatove Operation (RelOp) indicated by the parameter oprtr on the 2 passed BaseTypes if appropriate.

Methods inherited from class java.lang.Object

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

Constructor Detail

Operator

public Operator()

Method Detail

op

public static boolean op(int oprtr,
                         opendap.dap.BaseType lop,
                         opendap.dap.BaseType rop)
                  throws InvalidOperatorException,
                         RegExpException,
                         SBHException

Performs the Relatove Operation (RelOp) indicated by the parameter oprtr on the 2 passed BaseTypes if appropriate.

Obviously some type don't compare logically, such as asking if String is less than a Float. For these non sensical operations and InvalidOperatorException is thrown.

Parameters:

oprtr - The operatoration to perform as defined in opendap.servers.parsers.ExprParserConstants

lop - A BaseType to be used as the left operand.

rop - A BaseType to be used as the right operand.

Returns:

True is the operation evaluates as true, flase otherwise.

Throws:

InvalidOperatorException

RegExpException

SBHException

See Also:

ExprParserConstants