UnifyingItemsMapper.java

/**
 * Copyright 2011 Michael R. Lange <michael.r.lange@langmi.de>.
 *
 * Licensed 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 de.langmi.spring.batch.examples.readers.support;

import java.util.List;

/**
 * Interface for unifying items mapper implementations.
 * 
 * @author Michael R. Lange <michael.r.lange@langmi.de>
 */
public interface UnifyingItemsMapper<T> {

    /**
     * Should return null, if there are no items, or all items are null.
     *
     * @param items
     * @return
     * @throws Exception 
     */
    T mapItems(List<?> items) throws Exception;
}