org.eclipse.persistence.jpa.jpql.tools.DefaultParameterTypeVisitor Maven / Gradle / Ivy
/*
* Copyright (c) 2012, 2021 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 v. 2.0 which is available at
* http://www.eclipse.org/legal/epl-2.0,
* or the Eclipse Distribution License v. 1.0 which is available at
* http://www.eclipse.org/org/documents/edl-v10.php.
*
* SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause
*/
// Contributors:
// Oracle - initial API and implementation
//
package org.eclipse.persistence.jpa.jpql.tools;
import org.eclipse.persistence.jpa.jpql.ParameterTypeVisitor;
import org.eclipse.persistence.jpa.jpql.tools.spi.IType;
/**
* This visitor calculates the type of an input parameter.
*
* 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.
*
* @version 2.5
* @since 2.4
* @author Pascal Filion
*/
public class DefaultParameterTypeVisitor extends ParameterTypeVisitor {
/**
* The context used to query information about the application metadata and cached information.
*/
private JPQLQueryContext queryContext;
/**
* Creates a new DefaultParameterTypeVisitor.
*
* @param queryContext The context used to query information about the application metadata and
* cached information
*/
public DefaultParameterTypeVisitor(JPQLQueryContext queryContext) {
super();
this.queryContext = queryContext;
}
@Override
public IType getType() {
// The type should be ignored, use the special constant
if (ignoreType) {
return queryContext.getTypeHelper().unknownType();
}
// The type name was set
if (typeName != null) {
return queryContext.getType(typeName);
}
// The calculation couldn't find an expression with a type
if (expression == null) {
if (type == null) {
type = Object.class;
}
return queryContext.getType(type);
}
return queryContext.getType(expression);
}
}