com.cocktail.initializer.ItemReader.java Source code

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/*
 * Copyright Adel Ghoulem && Youssef Arfaoui
 * 
 * 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 com.cocktail.initializer;

import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

import org.springframework.batch.item.ExecutionContext;
import org.springframework.batch.item.file.FlatFileItemReader;
import org.springframework.batch.item.file.mapping.DefaultLineMapper;
import org.springframework.batch.item.file.mapping.FieldSetMapper;
import org.springframework.batch.item.file.separator.DefaultRecordSeparatorPolicy;
import org.springframework.batch.item.file.transform.DelimitedLineTokenizer;
import org.springframework.core.io.ClassPathResource;

/**
 * The Class ItemReader.
 *
 * @author arfaouiy
 * @param <I>
 *            the generic type
 */

public class ItemReader<I> {

    /**
     * Read items.
     *
     * @param <I>
     *            the generic type
     * @param path
     *            the path
     * @param itemMapper
     *            the item mapper
     * @return the list
     * @throws Exception
     *             the exception
     */
    public static <I> List<I> readItems(String path, FieldSetMapper<I> itemMapper) throws Exception {

        ClassPathResource resource = new ClassPathResource(path);
        Scanner scanner = new Scanner(resource.getInputStream());
        String line = scanner.nextLine();
        scanner.close();

        FlatFileItemReader<I> itemReader = new FlatFileItemReader<I>();
        itemReader.setResource(resource);

        // DelimitedLineTokenizer defaults to | as its delimiter
        DelimitedLineTokenizer tokenizer = new DelimitedLineTokenizer("|");
        tokenizer.setNames(line.split("\\|"));
        tokenizer.setStrict(false);

        DefaultLineMapper<I> lineMapper = new DefaultLineMapper<I>();
        lineMapper.setLineTokenizer(tokenizer);
        lineMapper.setFieldSetMapper(itemMapper);
        itemReader.setLineMapper(lineMapper);
        itemReader.setRecordSeparatorPolicy(new DefaultRecordSeparatorPolicy());
        itemReader.setLinesToSkip(1);
        itemReader.open(new ExecutionContext());

        List<I> items = new ArrayList<>();
        I item = null;

        do {

            item = itemReader.read();

            if (item != null) {
                items.add(item);
            }

        } while (item != null);

        return items;
    }

}