dods.dap.parser
Class ExprParser

java.lang.Object
  dods.dap.parser.ExprParser

All Implemented Interfaces:

ExprParserConstants

public class ExprParser
extends Object
implements ExprParserConstants

The constraint expression parser class.

Because it only makes sense to evaluate CEs when serving data, the BaseTyeFactory must create instances of the SDtype classes, not the Dtype classes. The is because we use the setRead method of the class ServerMethods when creating constants (to ensure that the evaluator doesn't try to read tem from the dataset!).

Author:

jhrg

Field Summary

Token	jj_nt
boolean	lookingAhead
Token	token
ExprParserTokenManager	token_source

Fields inherited from interface dods.dap.parser.ExprParserConstants

AMPERSAND, ASTERISK, COLON, COMMA, DEFAULT, EOF, EQUAL, EXPONENT, FLOAT, GREATER, GREATER_EQL, ID, INT, LBRACE, LBRACKET, LESS, LESS_EQL, LPAREN, MANTISSA, NOT_EQUAL, QUOTED_STR, RBRACE, RBRACKET, REGEXP, RPAREN, SEPARATOR, STR, tokenImage, UNQUOTED_STR, UNTERM_QUOTE

Constructor Summary

ExprParser(ExprParserTokenManager tm)

ExprParser(InputStream stream)

ExprParser(Reader stream)

Method Summary

Vector	arg_list()
void	array_index(int count, ServerArrayMethods bt)
Clause	bool_function()
Clause	clause()
Stack	component(Stack components)
dods.dap.BaseType	constant()
void	constraint_expression(CEEvaluator ceEval, dods.dap.BaseTypeFactory factory, ClauseFactory clauseFactory) This is the entry point for the Constraint expression parser.
void	disable_tracing()
void	enable_tracing()
String	field()
ParseException	generateParseException()
Token	getNextToken()
Token	getToken(int index)
void	proj_clause()
void	proj_variable()
void	projection()
void	ReInit(ExprParserTokenManager tm)
void	ReInit(InputStream stream)
void	ReInit(Reader stream)
int	rel_op()
void	selection()
SubClause	value()

Methods inherited from class java.lang.Object

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

Field Detail

token_source

public ExprParserTokenManager token_source

token

public Token token

jj_nt

public Token jj_nt

lookingAhead

public boolean lookingAhead

Constructor Detail

ExprParser

public ExprParser(InputStream stream)

ExprParser

public ExprParser(Reader stream)

ExprParser

public ExprParser(ExprParserTokenManager tm)

Method Detail

constraint_expression

public final void constraint_expression(CEEvaluator ceEval,
                                        dods.dap.BaseTypeFactory factory,
                                        ClauseFactory clauseFactory)
                                 throws ParseException,
                                        dods.dap.NoSuchVariableException,
                                        dods.dap.NoSuchFunctionException,
                                        InvalidOperatorException,
                                        dods.dap.DODSException,
                                        InvalidParameterException,
                                        SBHException,
                                        WrongTypeException

This is the entry point for the Constraint expression parser.

Note that this method catches any ParserException and recasts it to a DODSException after replacing all double quotes with single quotes.

Parameters:

ceEval - A CEEvaluator instance where any select clauses will be dumped and from which the DDS, which supplies the evaluation environment, will be read.

factory - A BaseTypeFactory used to generate instances of variables as needed (e.g., to hold values of constants).

clauseFactory - A ClauseFactory used to generate instances of each type of clause.

Throws:

ParseException

dods.dap.NoSuchVariableException

dods.dap.NoSuchFunctionException

InvalidOperatorException

dods.dap.DODSException

InvalidParameterException

SBHException

WrongTypeException

selection

public final void selection()
                     throws ParseException,
                            dods.dap.NoSuchVariableException,
                            dods.dap.NoSuchFunctionException,
                            InvalidOperatorException,
                            ParseException,
                            SBHException,
                            dods.dap.DODSException

Throws:

ParseException

dods.dap.NoSuchVariableException

dods.dap.NoSuchFunctionException

InvalidOperatorException

SBHException

dods.dap.DODSException

clause

public final Clause clause()
                    throws ParseException,
                           dods.dap.NoSuchVariableException,
                           dods.dap.NoSuchFunctionException,
                           InvalidOperatorException,
                           ParseException,
                           dods.dap.DODSException

Throws:

ParseException

dods.dap.NoSuchVariableException

dods.dap.NoSuchFunctionException

InvalidOperatorException

dods.dap.DODSException

bool_function

public final Clause bool_function()
                           throws ParseException,
                                  dods.dap.NoSuchVariableException,
                                  dods.dap.NoSuchFunctionException,
                                  InvalidOperatorException,
                                  ParseException,
                                  dods.dap.DODSException

Throws:

ParseException

dods.dap.NoSuchVariableException

dods.dap.NoSuchFunctionException

InvalidOperatorException

dods.dap.DODSException

rel_op

public final int rel_op()
                 throws ParseException

Throws:

ParseException

projection

public final void projection()
                      throws ParseException,
                             dods.dap.NoSuchVariableException,
                             dods.dap.NoSuchFunctionException,
                             InvalidOperatorException,
                             ParseException,
                             InvalidParameterException,
                             SBHException,
                             WrongTypeException,
                             dods.dap.DODSException

Throws:

ParseException

dods.dap.NoSuchVariableException

dods.dap.NoSuchFunctionException

InvalidOperatorException

InvalidParameterException

SBHException

WrongTypeException

dods.dap.DODSException

proj_clause

public final void proj_clause()
                       throws ParseException,
                              dods.dap.NoSuchVariableException,
                              dods.dap.NoSuchFunctionException,
                              InvalidOperatorException,
                              ParseException,
                              InvalidParameterException,
                              SBHException,
                              WrongTypeException,
                              dods.dap.DODSException

Throws:

ParseException

dods.dap.NoSuchVariableException

dods.dap.NoSuchFunctionException

InvalidOperatorException

InvalidParameterException

SBHException

WrongTypeException

dods.dap.DODSException

proj_variable

public final void proj_variable()
                         throws ParseException,
                                dods.dap.NoSuchVariableException,
                                dods.dap.NoSuchFunctionException,
                                InvalidOperatorException,
                                ParseException,
                                InvalidParameterException,
                                SBHException,
                                WrongTypeException,
                                dods.dap.DODSException

Throws:

ParseException

dods.dap.NoSuchVariableException

dods.dap.NoSuchFunctionException

InvalidOperatorException

InvalidParameterException

SBHException

WrongTypeException

dods.dap.DODSException

component

public final Stack component(Stack components)
                      throws ParseException,
                             ParseException,
                             dods.dap.DODSException

Throws:

ParseException

dods.dap.DODSException

arg_list

public final Vector arg_list()
                      throws ParseException,
                             dods.dap.NoSuchVariableException,
                             dods.dap.NoSuchFunctionException,
                             InvalidOperatorException,
                             ParseException,
                             dods.dap.DODSException

Throws:

ParseException

dods.dap.NoSuchVariableException

dods.dap.NoSuchFunctionException

InvalidOperatorException

dods.dap.DODSException

array_index

public final void array_index(int count,
                              ServerArrayMethods bt)
                       throws ParseException,
                              ParseException,
                              dods.dap.DODSException,
                              InvalidParameterException,
                              SBHException

Throws:

ParseException

dods.dap.DODSException

InvalidParameterException

SBHException

value

public final SubClause value()
                      throws ParseException,
                             dods.dap.NoSuchVariableException,
                             dods.dap.NoSuchFunctionException,
                             InvalidOperatorException,
                             dods.dap.DODSException,
                             ParseException

Throws:

ParseException

dods.dap.NoSuchVariableException

dods.dap.NoSuchFunctionException

InvalidOperatorException

dods.dap.DODSException

field

public final String field()
                   throws ParseException,
                          ParseException

Throws:

ParseException

constant

public final dods.dap.BaseType constant()
                                 throws ParseException,
                                        dods.dap.DODSException,
                                        ParseException

Throws:

ParseException

dods.dap.DODSException

ReInit

public void ReInit(InputStream stream)

ReInit

public void ReInit(Reader stream)

ReInit

public void ReInit(ExprParserTokenManager tm)

getNextToken

public final Token getNextToken()

getToken

public final Token getToken(int index)

generateParseException

public final ParseException generateParseException()

enable_tracing

public final void enable_tracing()

disable_tracing

public final void disable_tracing()