com.pervasive.datarush.expression

Class ExpressionParser

java.lang.Object

com.pervasive.datarush.expression.ExpressionParser

All Implemented Interfaces:

ExpressionParserConstants

public class ExpressionParser
extends Object
implements ExpressionParserConstants

Parses expressions into scalar valued functions, field derivations, and aggregations.

Use the following methods to parse an expression:

Desired Object Type	Parsing Method
ScalarValuedFunction	svfExpression()
List<FieldDerivation>	fdExpression()
List<Aggregation>	aggExpression()

Field Summary

Fields

Modifier and Type	Field and Description
Token	jj_nt Next token.
Token	token Current token.
ExpressionParserTokenManager	token_source Generated Token Manager.

Fields inherited from interface com.pervasive.datarush.expression.ExpressionParserConstants

BANG, BIT_AND, BIT_OR, CHARACTER_LITERAL, COMMA, DECIMAL_LITERAL, DEFAULT, DEQ, DIGIT, DOT, EOF, EQ, EXPONENT, FLOATING_POINT_LITERAL, GE, GT, HEX_LITERAL, IDENTIFIER, INTEGER_LITERAL, KW_AND, KW_AS, KW_CASE, KW_DISTINCT, KW_ELSE, KW_END, KW_FALSE, KW_IN, KW_IS, KW_LIKE, KW_NOT, KW_NULL, KW_OR, KW_STR_TO_DATE, KW_STR_TO_TIME, KW_STR_TO_TIMESTAMP, KW_THEN, KW_TRUE, KW_WHEN, LBRACE, LBRACKET, LE, LETTER, LPAREN, LT, MINUS, NE, OCTAL_LITERAL, PERCENT, PLUS, QUOTED_IDENTIFIER, RBRACE, RBRACKET, RPAREN, SC_AND, SC_OR, SEMICOLON, SLASH, STAR, STRING_LITERAL, tokenImage, XOR

Constructor Summary

Constructors

Constructor and Description
ExpressionParser(ExpressionParserTokenManager tm) Constructor with generated Token Manager.
ExpressionParser(InputStream stream) Constructor with InputStream.
ExpressionParser(InputStream stream, String encoding) Constructor with InputStream and supplied encoding
ExpressionParser(Reader stream) Constructor.

Method Summary

Methods

Modifier and Type	Method and Description
List<Aggregation>	aggExpression()
Aggregation	aggFunctionCall()
Aggregation	aggregate()
ScalarValuedFunction	booleanLiteral()
ScalarValuedFunction	dateLiteral()
void	disable_tracing() Disable tracing.
boolean	distinct()
ScalarValuedFunction	doubleLiteral()
void	enable_tracing() Enable tracing.
ScalarValuedFunction	expression() Deprecated. Replaced by svfExpression() for parsing scalar valued function expressions. Also use fdExpression() for parsing field derivation expressions and aggExpression() for parsing aggregation expressions.
List<FieldDerivation>	fdExpression()
ParseException	generateParseException() Generate ParseException.
Token	getNextToken() Get the next Token.
Token	getToken(int index) Get the specific Token.
ScalarValuedFunction	identifier()
String	identifierName()
void	inOperator()
ScalarValuedFunction	integerLiteral()
String	isOperand()
void	isOperator()
List<ScalarValuedFunction>	literalList()
static void	main(String[] args)
void	nullKeyword()
ScalarValuedFunction	nullLiteral()
ScalarValuedFunction	numberOrStringLiteral()
ScalarValuedFunction	precedenceAddSubExpression()
String	precedenceAddSubOperator()
ScalarValuedFunction	precedenceAndExpression()
void	precedenceAndOperator()
ScalarValuedFunction	precedenceCaseWhenExpression()
FieldDerivation	precedenceDerivationExpression()
ScalarValuedFunction	precedenceEqualExpression()
String	precedenceEqualOperator()
ScalarValuedFunction	precedenceEqualSubexpression(ScalarValuedFunction lhs)
ScalarValuedFunction	precedenceFunctionExpression()
ScalarValuedFunction[]	precedenceFunctionParameterListExpression()
ScalarValuedFunction	precedenceMultDivExpression()
String	precedenceMultDivOperator()
ScalarValuedFunction	precedenceNegativeExpression()
boolean	precedenceNegativeOperator()
ScalarValuedFunction	precedenceNotExpression()
boolean	precedenceNotOperator()
ScalarValuedFunction	precedenceOrExpression()
void	precedenceOrOperator()
ScalarValuedFunction	precedenceParenExpression()
String	quotedIdentifierValue()
void	ReInit(ExpressionParserTokenManager tm) Reinitialise.
void	ReInit(InputStream stream) Reinitialise.
void	ReInit(InputStream stream, String encoding) Reinitialise.
void	ReInit(Reader stream) Reinitialise.
ScalarValuedFunction	stringLiteral()
String	stringLiteralValue()
ScalarValuedFunction	svfExpression()
ScalarValuedFunction	timeofdayLiteral()
ScalarValuedFunction	timestampLiteral()
ScalarValuedFunction	valueExpression()

Methods inherited from class java.lang.Object

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

Field Detail

token_source

public ExpressionParserTokenManager token_source

Generated Token Manager.

token

public Token token

Current token.

jj_nt

public Token jj_nt

Next token.

Constructor Detail

ExpressionParser

public ExpressionParser(InputStream stream)

Constructor with InputStream.

ExpressionParser

public ExpressionParser(InputStream stream,
                String encoding)

Constructor with InputStream and supplied encoding

ExpressionParser

public ExpressionParser(Reader stream)

Constructor.

ExpressionParser

public ExpressionParser(ExpressionParserTokenManager tm)

Constructor with generated Token Manager.

Method Detail

main

public static void main(String[] args)

expression

@Deprecated
public ScalarValuedFunction expression()
                                throws ParseException

Deprecated. Replaced by svfExpression() for parsing scalar valued function expressions. Also use fdExpression() for parsing field derivation expressions and aggExpression() for parsing aggregation expressions.

Throws:

ParseException

aggExpression

public final List<Aggregation> aggExpression()
                                      throws ParseException

Throws:

ParseException

aggregate

public final Aggregation aggregate()
                            throws ParseException

Throws:

ParseException

aggFunctionCall

public final Aggregation aggFunctionCall()
                                  throws ParseException

Throws:

ParseException

distinct

public final boolean distinct()
                       throws ParseException

Throws:

ParseException

fdExpression

public final List<FieldDerivation> fdExpression()
                                         throws ParseException

Throws:

ParseException

precedenceDerivationExpression

public final FieldDerivation precedenceDerivationExpression()
                                                     throws ParseException

Throws:

ParseException

svfExpression

public final ScalarValuedFunction svfExpression()
                                         throws ParseException

Throws:

ParseException

precedenceOrExpression

public final ScalarValuedFunction precedenceOrExpression()
                                                  throws ParseException

Throws:

ParseException

precedenceAndExpression

public final ScalarValuedFunction precedenceAndExpression()
                                                   throws ParseException

Throws:

ParseException

precedenceNotExpression

public final ScalarValuedFunction precedenceNotExpression()
                                                   throws ParseException

Throws:

ParseException

precedenceParenExpression

public final ScalarValuedFunction precedenceParenExpression()
                                                     throws ParseException

Throws:

ParseException

precedenceEqualExpression

public final ScalarValuedFunction precedenceEqualExpression()
                                                     throws ParseException

Throws:

ParseException

precedenceEqualSubexpression

public final ScalarValuedFunction precedenceEqualSubexpression(ScalarValuedFunction lhs)
                                                        throws ParseException

Throws:

ParseException

valueExpression

public final ScalarValuedFunction valueExpression()
                                           throws ParseException

Throws:

ParseException

precedenceOrOperator

public final void precedenceOrOperator()
                                throws ParseException

Throws:

ParseException

precedenceAndOperator

public final void precedenceAndOperator()
                                 throws ParseException

Throws:

ParseException

precedenceNotOperator

public final boolean precedenceNotOperator()
                                    throws ParseException

Throws:

ParseException

precedenceEqualOperator

public final String precedenceEqualOperator()
                                     throws ParseException

Throws:

ParseException

isOperator

public final void isOperator()
                      throws ParseException

Throws:

ParseException

isOperand

public final String isOperand()
                       throws ParseException

Throws:

ParseException

inOperator

public final void inOperator()
                      throws ParseException

Throws:

ParseException

identifier

public final ScalarValuedFunction identifier()
                                      throws ParseException

Throws:

ParseException

identifierName

public final String identifierName()
                            throws ParseException

Throws:

ParseException

numberOrStringLiteral

public final ScalarValuedFunction numberOrStringLiteral()
                                                 throws ParseException

Throws:

ParseException

literalList

public final List<ScalarValuedFunction> literalList()
                                             throws ParseException

Throws:

ParseException

integerLiteral

public final ScalarValuedFunction integerLiteral()
                                          throws ParseException

Throws:

ParseException

doubleLiteral

public final ScalarValuedFunction doubleLiteral()
                                         throws ParseException

Throws:

ParseException

stringLiteral

public final ScalarValuedFunction stringLiteral()
                                         throws ParseException

Throws:

ParseException

stringLiteralValue

public final String stringLiteralValue()
                                throws ParseException

Throws:

ParseException

quotedIdentifierValue

public final String quotedIdentifierValue()
                                   throws ParseException

Throws:

ParseException

booleanLiteral

public final ScalarValuedFunction booleanLiteral()
                                          throws ParseException

Throws:

ParseException

dateLiteral

public final ScalarValuedFunction dateLiteral()
                                       throws ParseException

Throws:

ParseException

timeofdayLiteral

public final ScalarValuedFunction timeofdayLiteral()
                                            throws ParseException

Throws:

ParseException

timestampLiteral

public final ScalarValuedFunction timestampLiteral()
                                            throws ParseException

Throws:

ParseException

nullLiteral

public final ScalarValuedFunction nullLiteral()
                                       throws ParseException

Throws:

ParseException

nullKeyword

public final void nullKeyword()
                       throws ParseException

Throws:

ParseException

precedenceAddSubExpression

public final ScalarValuedFunction precedenceAddSubExpression()
                                                      throws ParseException

Throws:

ParseException

precedenceMultDivExpression

public final ScalarValuedFunction precedenceMultDivExpression()
                                                       throws ParseException

Throws:

ParseException

precedenceNegativeExpression

public final ScalarValuedFunction precedenceNegativeExpression()
                                                        throws ParseException

Throws:

ParseException

precedenceAddSubOperator

public final String precedenceAddSubOperator()
                                      throws ParseException

Throws:

ParseException

precedenceMultDivOperator

public final String precedenceMultDivOperator()
                                       throws ParseException

Throws:

ParseException

precedenceNegativeOperator

public final boolean precedenceNegativeOperator()
                                         throws ParseException

Throws:

ParseException

precedenceFunctionExpression

public final ScalarValuedFunction precedenceFunctionExpression()
                                                        throws ParseException

Throws:

ParseException

precedenceFunctionParameterListExpression

public final ScalarValuedFunction[] precedenceFunctionParameterListExpression()
                                                                       throws ParseException

Throws:

ParseException

precedenceCaseWhenExpression

public final ScalarValuedFunction precedenceCaseWhenExpression()
                                                        throws ParseException

Throws:

ParseException

ReInit

public void ReInit(InputStream stream)

Reinitialise.

ReInit

public void ReInit(InputStream stream,
          String encoding)

Reinitialise.

ReInit

public void ReInit(Reader stream)

Reinitialise.

ReInit

public void ReInit(ExpressionParserTokenManager tm)

Reinitialise.

getNextToken

public final Token getNextToken()

Get the next Token.

getToken

public final Token getToken(int index)

Get the specific Token.

generateParseException

public ParseException generateParseException()

Generate ParseException.

enable_tracing

public final void enable_tracing()

Enable tracing.

disable_tracing

public final void disable_tracing()

Disable tracing.