org.apache.openjpa.kernel.jpql
Class JPQLExpressionBuilder

java.lang.Object
  org.apache.openjpa.kernel.exps.AbstractExpressionBuilder
      org.apache.openjpa.kernel.jpql.JPQLExpressionBuilder

public class JPQLExpressionBuilder
extends AbstractExpressionBuilder

Builder for JPQL expressions. This class takes the query parsed in JPQLExpressionBuilder.ParsedJPQL and converts it to an expression tree using an ExpressionFactory. Public for unit testing purposes.

Author:

Marc Prud'hommeaux, Patrick Linskey

Nested Class Summary

protected static class	JPQLExpressionBuilder.JPQLNode Base node that will be generated by the JPQLExpressionBuilder; base class of the SimpleNode that is used by JPQLExpressionBuilder.ParsedJPQL.
static class	JPQLExpressionBuilder.ParsedJPQL Public for unit testing purposes.

Field Summary

Fields inherited from class org.apache.openjpa.kernel.exps.AbstractExpressionBuilder

CONTAINS_TYPE_ELEMENT, CONTAINS_TYPE_KEY, CONTAINS_TYPE_VALUE, EX_FATAL, EX_UNSUPPORTED, EX_USER, factory, resolver, TYPE_CHAR_OBJ, TYPE_COLLECTION, TYPE_MAP, TYPE_NUMBER, TYPE_OBJECT, TYPE_STRING

Constructor Summary

JPQLExpressionBuilder(ExpressionFactory factory, ExpressionStoreQuery query, Object parsedQuery)
Constructor.

Method Summary

protected String	currentQuery() Returns the current string being parsed; used for error messages.
protected Expression	evalFetchJoins(QueryExpressions exps)
protected void	evalSetClause(QueryExpressions exps)
protected ClassMetaData	getCandidateMetaData(JPQLExpressionBuilder.JPQLNode node)
protected ClassLoader	getClassLoader() Returns the class loader that should be used for resolving class names (in addition to the resolver in the query).
protected Class	getDeclaredVariableType(String name) Returns the type of the named variabe if it has been declared.
protected Localizer	getLocalizer() Used for obtaining the Localizer to use for translating error messages.
protected JPQLExpressionBuilder.ParsedJPQL	getParsedQuery()
protected JPQLExpressionBuilder.ParsedJPQL	getParsedQuery(String jpql)
protected Value	getVariable(String id, boolean bind) Identification variables in JPQL are case insensitive, so lower-case all variables we are going to bind.
protected boolean	isDeclaredVariable(String name) Returns whether the specified variable name has been explicitly declared.
protected boolean	isSeendVariable(String id)
protected ClassMetaData	resolveClassMetaData(JPQLExpressionBuilder.JPQLNode node)
protected void	setImplicitTypes(Value val1, Value val2, Class expected) Set the implicit types of the given values based on the fact that they're used together, and based on the operator type.

Methods inherited from class org.apache.openjpa.kernel.exps.AbstractExpressionBuilder

addAccessPath, assertUnboundVariablesValid, bind, getAccessPath, getMetaData, getMetaData, isBound, isSeenVariable, parseException, setImplicitContainsTypes, setImplicitType, traversePath, traversePath, traverseStaticField, traverseXPath

Methods inherited from class java.lang.Object

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

Constructor Detail

JPQLExpressionBuilder

public JPQLExpressionBuilder(ExpressionFactory factory,
                             ExpressionStoreQuery query,
                             Object parsedQuery)

Constructor.

Parameters:

factory - the expression factory to use

query - used to resolve variables, parameters, and class names used in the query

parsedQuery - the parsed query

Method Detail

getLocalizer

protected Localizer getLocalizer()

Description copied from class: AbstractExpressionBuilder

Used for obtaining the Localizer to use for translating error messages.

Specified by:

getLocalizer in class AbstractExpressionBuilder

getClassLoader

protected ClassLoader getClassLoader()

Description copied from class: AbstractExpressionBuilder

Returns the class loader that should be used for resolving class names (in addition to the resolver in the query).

Specified by:

getClassLoader in class AbstractExpressionBuilder

getParsedQuery

protected JPQLExpressionBuilder.ParsedJPQL getParsedQuery()

getParsedQuery

protected JPQLExpressionBuilder.ParsedJPQL getParsedQuery(String jpql)

resolveClassMetaData

protected ClassMetaData resolveClassMetaData(JPQLExpressionBuilder.JPQLNode node)

getCandidateMetaData

protected ClassMetaData getCandidateMetaData(JPQLExpressionBuilder.JPQLNode node)

currentQuery

protected String currentQuery()

Description copied from class: AbstractExpressionBuilder

Returns the current string being parsed; used for error messages.

Specified by:

currentQuery in class AbstractExpressionBuilder

evalFetchJoins

protected Expression evalFetchJoins(QueryExpressions exps)

evalSetClause

protected void evalSetClause(QueryExpressions exps)

isDeclaredVariable

protected boolean isDeclaredVariable(String name)

Description copied from class: AbstractExpressionBuilder

Returns whether the specified variable name has been explicitly declared. Note all query languages necessarily support declaring variables.

Specified by:

isDeclaredVariable in class AbstractExpressionBuilder

Parameters:

name - the variable to check

Returns:

true if the variabe has been explicitely declared

getVariable

protected Value getVariable(String id,
                            boolean bind)

Identification variables in JPQL are case insensitive, so lower-case all variables we are going to bind.

Overrides:

getVariable in class AbstractExpressionBuilder

isSeendVariable

protected boolean isSeendVariable(String id)

setImplicitTypes

protected void setImplicitTypes(Value val1,
                                Value val2,
                                Class expected)

Description copied from class: AbstractExpressionBuilder

Set the implicit types of the given values based on the fact that they're used together, and based on the operator type.

Overrides:

setImplicitTypes in class AbstractExpressionBuilder

getDeclaredVariableType

protected Class getDeclaredVariableType(String name)

Description copied from class: AbstractExpressionBuilder

Returns the type of the named variabe if it has been declared.

Specified by:

getDeclaredVariableType in class AbstractExpressionBuilder