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java.lang.Objectorg.exolab.castor.jdo.oql.Lexer
public class Lexer
Seperates an input string of OQL into a stream of Token
s.
Field Summary | |
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(package private) int |
_pos
|
(package private) java.lang.String |
_queryString
|
(package private) boolean |
endOfQueryPassed
|
(package private) java.util.Hashtable |
keywords
|
Fields inherited from interface org.exolab.castor.jdo.oql.TokenTypes |
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ARROW, BOOLEAN_LITERAL, CHAR_LITERAL, COLON, COMMA, CONCAT, DATE_LITERAL, DIVIDE, DOLLAR, DOT, DOUBLE_LITERAL, END_OF_QUERY, EQUAL, GT, GTE, IDENTIFIER, KEYWORD_ABS, KEYWORD_AND, KEYWORD_AS, KEYWORD_ASC, KEYWORD_AVG, KEYWORD_BETWEEN, KEYWORD_BY, KEYWORD_COUNT, KEYWORD_DESC, KEYWORD_DISTINCT, KEYWORD_FROM, KEYWORD_IN, KEYWORD_IS_DEFINED, KEYWORD_IS_UNDEFINED, KEYWORD_LIKE, KEYWORD_LIMIT, KEYWORD_LIST, KEYWORD_MAX, KEYWORD_MIN, KEYWORD_MOD, KEYWORD_NIL, KEYWORD_NOT, KEYWORD_OFFSET, KEYWORD_OR, KEYWORD_ORDER, KEYWORD_SELECT, KEYWORD_SUM, KEYWORD_UNDEFINED, KEYWORD_WHERE, LONG_LITERAL, LPAREN, LT, LTE, MINUS, NOT_EQUAL, PLUS, RPAREN, STRING_LITERAL, TIME_LITERAL, TIMES, TIMESTAMP_LITERAL |
Constructor Summary | |
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Lexer(java.lang.String oqlQueryString)
Creates a lexer which will seperate a string query into a series of tokens. |
Method Summary | |
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boolean |
hasMoreTokens()
Checks whether the query strin has been fully consumed. |
Token |
nextToken()
Returns the next Token from the stream. |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Field Detail |
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java.lang.String _queryString
int _pos
java.util.Hashtable keywords
boolean endOfQueryPassed
Constructor Detail |
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public Lexer(java.lang.String oqlQueryString)
oqlQueryString
- The string representation of the OQL QueryMethod Detail |
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public boolean hasMoreTokens()
public Token nextToken() throws NoMoreTokensException, InvalidCharException
Token
from the stream.
NoMoreTokensException
- if the last character was already consumed.
InvalidCharException
- if an invalid character is found while
generating the next Token.
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