/*******************************************************************************
* Copyright (c) 2006, 2013 Oracle and/or its affiliates. All rights reserved.
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v1.0 and Eclipse Distribution License v. 1.0
* which accompanies this distribution.
* The Eclipse Public License is available at http://www.eclipse.org/legal/epl-v10.html
* and the Eclipse Distribution License is available at
* http://www.eclipse.org/org/documents/edl-v10.php.
*
* Contributors:
* Oracle - initial API and implementation
*
******************************************************************************/
package org.eclipse.persistence.jpa.jpql;
import org.eclipse.persistence.jpa.jpql.model.IJPQLQueryBuilder;
import org.eclipse.persistence.jpa.jpql.model.JPQLQueryBuilder1_0;
import org.eclipse.persistence.jpa.jpql.model.JPQLQueryBuilder2_0;
import org.eclipse.persistence.jpa.jpql.model.JPQLQueryBuilder2_1;
import org.eclipse.persistence.jpa.jpql.parser.JPQLGrammar;
import org.eclipse.persistence.jpa.jpql.spi.IQuery;
/**
* This helper can perform the following operations over a JPQL query:
* <ul>
* <li>Calculates the result type of a query: {@link #getResultType()};</li>
* <li>Calculates the type of an input parameter: {@link #getParameterType(String)}.</li>
* <li>Calculates the possible choices to complete the query from a given
* position (used for content assist): {@link #buildContentAssistProposals(int)}.</li>
* <li>Validates the query by introspecting it grammatically and semantically:
* <ul>
* <li>{@link #validate()},</li>
* <li>{@link #validateGrammar()},</li>
* <li>{@link #validateSemantic()}.</li>
* </ul></li>
* </ul>
*
* This helper should be used when the JPQL query is written using the JPQL grammar defined in the
* Java Persistence functional specification 1.0 or 2.x.<p>
*
* Provisional API: This interface is part of an interim API that is still under development and
* expected to change significantly before reaching stability. It is available at this early stage
* to solicit feedback from pioneering adopters on the understanding that any code that uses this
* API will almost certainly be broken (repeatedly) as the API evolves.<p>
*
* @version 2.4
* @since 2.3
* @author Pascal Filion
*/
public class DefaultJPQLQueryHelper extends AbstractJPQLQueryHelper {
/**
* Creates a new <code>DefaultJPQLQueryHelper</code>.
*
* @param jpqlGrammar The {@link JPQLGrammar} that will determine how to parse JPQL queries
*/
public DefaultJPQLQueryHelper(JPQLGrammar jpqlGrammar) {
super(jpqlGrammar);
}
/**
* Creates a new <code>JPQLQueryHelper</code>.
*
* @param queryContext The context used to query information about the JPQL query
*/
public DefaultJPQLQueryHelper(JPQLQueryContext queryContext) {
super(queryContext);
}
/**
* {@inheritDoc}
*/
public BasicRefactoringTool buildBasicRefactoringTool() {
return new DefaultBasicRefactoringTool(
getQuery().getExpression(),
getGrammar(),
getProvider()
);
}
/**
* {@inheritDoc}
*/
@Override
protected AbstractContentAssistVisitor buildContentAssistVisitor(JPQLQueryContext queryContext) {
return new DefaultContentAssistVisitor(queryContext);
}
/**
* {@inheritDoc}
*/
@Override
protected DefaultGrammarValidator buildGrammarValidator(JPQLQueryContext queryContext) {
return new DefaultGrammarValidator(queryContext.getGrammar());
}
/**
* {@inheritDoc}
*/
@Override
protected JPQLQueryContext buildJPQLQueryContext(JPQLGrammar jpqlGrammar) {
return new DefaultJPQLQueryContext(jpqlGrammar);
}
/**
* Creates the right {@link IJPQLQueryBuilder} based on the JPQL grammar.
*
* @return A new concrete instance of {@link IJPQLQueryBuilder}
*/
protected IJPQLQueryBuilder buildQueryBuilder() {
switch (getGrammar().getJPAVersion()) {
case VERSION_1_0: return new JPQLQueryBuilder1_0();
case VERSION_2_0: return new JPQLQueryBuilder2_0();
default: return new JPQLQueryBuilder2_1();
}
}
/**
* {@inheritDoc}
*/
@Override
public RefactoringTool buildRefactoringTool() {
IQuery query = getQuery();
return new DefaultRefactoringTool(
query.getProvider(),
buildQueryBuilder(),
query.getExpression()
);
}
/**
* {@inheritDoc}
*/
@Override
protected DefaultSemanticValidator buildSemanticValidator(JPQLQueryContext queryContext) {
return new DefaultSemanticValidator(queryContext);
}
}