org.datanucleus.query.compiler

Class JPQLParser

java.lang.Object

org.datanucleus.query.compiler.AbstractParser

org.datanucleus.query.compiler.JPQLParser

All Implemented Interfaces:

Parser

public class JPQLParser
extends AbstractParser

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

Field Summary

Fields inherited from class org.datanucleus.query.compiler.AbstractParser

lexer, stack, strict

Constructor Summary

Constructors

Constructor and Description
JPQLParser() 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 for 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 for a VALUE construct.

Methods inherited from class org.datanucleus.query.compiler.AbstractParser

getLastDescendantNodeForNode, setExplicitParameters, setStrict

Methods inherited from class java.lang.Object

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

Constructor Detail

JPQLParser

public JPQLParser()

Constructor for a JPQL Parser.

Method Detail

parse

public Node parse(String expression)

parseVariable

public Node parseVariable(String expression)

parseFrom

public Node[] parseFrom(String expression)

parseUpdate

public Node[] parseUpdate(String expression)

parseOrder

public Node[] parseOrder(String expression)

parseResult

public Node[] parseResult(String expression)

parseTuple

public Node[] parseTuple(String expression)

parseVariables

public Node[][] parseVariables(String expression)

parseParameters

public Node[][] parseParameters(String expression)

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 for a KEY construct. Puts the KEY Node on the stack if one is found.

Returns:

Whether a KEY construct was found by the lexer.

processValue

protected boolean processValue()

Process for a VALUE construct. Puts the VALUE Node on the stack if one is found.

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. Also supports JDBC "escape syntax" for literals.

Returns:

The compiled literal