org.datanucleus.query.compiler

Class JPQLParser

java.lang.Object

org.datanucleus.query.compiler.JPQLParser

All Implemented Interfaces:

Parser

public class JPQLParser
extends Object
implements Parser

Implementation of a parser for JPQL query language. Generates Node tree(s) by use of the various parseXXX() methods.

Constructor Summary

Constructors

Constructor and Description
JPQLParser(Map options) Constructor for a JPQL Parser.

Method Summary

Modifier and Type	Method and Description
Node	parse(String expression)
Node[]	parseFrom(String expression)
Node[]	parseOrder(String expression)
Node[][]	parseParameters(String expression)
Node[]	parseResult(String expression)
Node[]	parseTuple(String expression)
Node[]	parseUpdate(String expression)
Node	parseVariable(String expression)
Node[][]	parseVariables(String expression)
protected void	processAdditiveExpression()
protected boolean	processEntry() Process an ENTRY construct.
protected boolean	processKey() Process a KEY construct.
protected boolean	processLiteral() A literal is one value of any type.
protected void	processMultiplicativeExpression()
protected void	processPrimary() Parses the primary.
protected boolean	processTreat() Process a TREAT construct, and put the node on the stack.
protected void	processUnaryExpression()
protected boolean	processValue() Process a VALUE construct.

Methods inherited from class java.lang.Object

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

Constructor Detail

JPQLParser

public JPQLParser(Map options)

Constructor for a JPQL Parser.

Parameters:

options - parser options

Method Detail

parse

public Node parse(String expression)

Specified by:

parse in interface Parser

parseVariable

public Node parseVariable(String expression)

Specified by:

parseVariable in interface Parser

parseFrom

public Node[] parseFrom(String expression)

Specified by:

parseFrom in interface Parser

parseUpdate

public Node[] parseUpdate(String expression)

Specified by:

parseUpdate in interface Parser

parseOrder

public Node[] parseOrder(String expression)

Specified by:

parseOrder in interface Parser

parseResult

public Node[] parseResult(String expression)

Specified by:

parseResult in interface Parser

parseTuple

public Node[] parseTuple(String expression)

Specified by:

parseTuple in interface Parser

parseVariables

public Node[][] parseVariables(String expression)

Specified by:

parseVariables in interface Parser

parseParameters

public Node[][] parseParameters(String expression)

Specified by:

parseParameters in interface Parser

processAdditiveExpression

protected void processAdditiveExpression()

processMultiplicativeExpression

protected void processMultiplicativeExpression()

processUnaryExpression

protected void processUnaryExpression()

processPrimary

protected void processPrimary()

Parses the primary. First look for a literal (e.g. "text"), then an identifier(e.g. variable). In the next step, call a function, if executing a function, on the literal or the identifier found.

processEntry

protected boolean processEntry()

Process an ENTRY construct. Puts the ENTRY Node on the stack.

Returns:

Whether a ENTRY construct was found by the lexer.

processKey

protected boolean processKey()

Process a KEY construct. Puts the KEY Node on the stack.

Returns:

Whether a KEY construct was found by the lexer.

processValue

protected boolean processValue()

Process a VALUE construct. Puts the VALUE Node on the stack.

Returns:

Whether a VALUE construct was found by the lexer.

processTreat

protected boolean processTreat()

Process a TREAT construct, and put the node on the stack.

Returns:

Whether TREAT was found by the lexer.

processLiteral

protected boolean processLiteral()

A literal is one value of any type. Supported literals are of types String, Floating Point, Integer, Character, Boolean and null e.g. 'J', "String", 1, 1.8, true, false, null.

Returns:

The compiled literal