/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.openejb.core.cmp;

import org.apache.openejb.OpenEJBException;

import javax.ejb.EntityBean;
import java.lang.reflect.Field;

public class SimpleKeyGenerator extends AbstractKeyGenerator {
    private final Field pkField;

    public SimpleKeyGenerator(final Class beanClass, final String pkField) throws OpenEJBException {
        this.pkField = getField(beanClass, pkField);
        if (!isValidPkField(this.pkField)) {
            throw new OpenEJBException("Invalid primray key field: " + pkField);
        }
    }

    public Object getPrimaryKey(final EntityBean bean) {
        final Object value = getFieldValue(pkField, bean);
        return value;
    }
}