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/*
 * Copyright (c) 2006, 2018 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.internal.jpa.jpql;

import org.eclipse.persistence.jpa.jpql.AbstractEclipseLinkParameterTypeVisitor;

/**
 * This visitor's responsibility is to find the type of an input parameter.
 *
 * @version 2.5
 * @since 2.3
 * @author Pascal Filion
 */
final class ParameterTypeVisitor extends AbstractEclipseLinkParameterTypeVisitor {

    /**
     * The context used to query information about the query.
     */
    private final JPQLQueryContext queryContext;

    /**
     * Creates a new ParameterTypeVisitor.
     *
     * @param queryContext The context used to query information about the application metadata and
     * cached information
     */
    ParameterTypeVisitor(JPQLQueryContext queryContext) {
        super();
        this.queryContext = queryContext;
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public Class getType() {

        // The type should be ignored, use the special constant
        if (ignoreType) {
            return Object.class;
        }

        // 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 type;
        }

        return queryContext.getType(expression);
    }
}