com.neoworks.jukex.query
Class JukeXParser

java.lang.Object
  |
  +--com.neoworks.rdc.Parser
        |
        +--com.neoworks.jukex.query.JukeXParser

public class JukeXParser

extends Parser

A recursive descent compiler which parses the JukeX Query Language into an object which represents a query.

Author:

Nick Vincent nick@neoworks.com

Field Summary

static int	SORT_ASC Result sorting (ORDER BY) flag indicating that results should be sorted in ascending order
static int	SORT_DESC Result sorting (ORDER BY) flag indicating that results should be sorted in descending order
static int	SORT_NONE Result sorting (ORDER BY) flag indicating that results should not be sorted

Fields inherited from class com.neoworks.rdc.Parser

DUMMY, fVerbose, ID, LOOKAHEAD_TYPE, LOOKAHEAD_VALUE, NONE, NUM, STRING

Method Summary

static JukeXParser	createParser(java.lang.String parseString) Create a new parser for the supplied String
Expression	expression() Parse an expression
java.util.Set	getAttributes() Returns a Set of String objects representing the set of attribute names present in the query.
java.util.List	getSelectAttributes() Get a List of Strings representing the attributes present in the SELECT statement of the query.
Expression	logicalop() Parse a logical operation
Query	parse() Parse the string.
Expression	prefixop() Parse a prefix operation.
Expression	relopexpression() Parse a relational operation.

Methods inherited from class com.neoworks.rdc.Parser

configure, displayMessageVerbose, getLookAheadData, getLookAheadType, getLookAheadValue, getVerbose, lookAhead, lookAhead, lookupTokenID, match, match, match, parseError, parseError, parseError, parseError, setVerbose

Methods inherited from class java.lang.Object

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

Field Detail

SORT_NONE

public static final int SORT_NONE

Result sorting (ORDER BY) flag indicating that results should not be sorted

See Also:

Constant Field Values

SORT_ASC

public static final int SORT_ASC

Result sorting (ORDER BY) flag indicating that results should be sorted in ascending order

See Also:

Constant Field Values

SORT_DESC

public static final int SORT_DESC

Result sorting (ORDER BY) flag indicating that results should be sorted in descending order

See Also:

Constant Field Values

Method Detail

createParser

public static JukeXParser createParser(java.lang.String parseString)

Create a new parser for the supplied String

Parameters:

parseString - The String to parse

Returns:

A JukeXParser for the parseString

parse

public Query parse()
            throws ParserException

Parse the string.

Returns:

A Query object corresponding to the query string parsed

Throws:

ParserException - If the string does not represent a valid query

expression

public Expression expression()
                      throws ParserException

Parse an expression

Returns:

The resulting Expression

Throws:

ParserException - If there is a parse error

logicalop

public Expression logicalop()
                     throws ParserException

Parse a logical operation

Returns:

The resulting Expression

Throws:

ParserException - If there is a parse error

prefixop

public Expression prefixop()
                    throws ParserException

Parse a prefix operation.

Returns:

The resulting Expression

Throws:

ParserException - If there is a parse error

relopexpression

public Expression relopexpression()
                           throws ParserException

Parse a relational operation.

Returns:

The resulting Expression

Throws:

ParserException - If there is a parse error

getAttributes

public java.util.Set getAttributes()

Returns a Set of String objects representing the set of attribute names present in the query.

Returns:

A Set of String objects

getSelectAttributes

public java.util.List getSelectAttributes()

Get a List of Strings representing the attributes present in the SELECT statement of the query.

Returns:

A List of the names of the Attributes present.