no.magott.training.ex2.ExchangeRateProducerItemProcessor.java Source code

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Here is the source code for no.magott.training.ex2.ExchangeRateProducerItemProcessor.java

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/*
 * Copyright 2011 the original author or authors.
 *
 * 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 no.magott.training.ex2;

import java.util.List;

import javax.sql.DataSource;

import org.apache.commons.collections.CollectionUtils;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.batch.item.ItemProcessor;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.JdbcTemplate;

/**
 * @author Morten Andersen-Gott
 *
 */
public class ExchangeRateProducerItemProcessor implements ItemProcessor<ExchangeRate, ExchangeRate> {

    private static final String FIND_EXCHANGE_RATE = "SELECT ID FROM EXCHANGE_RATE_REVERSE WHERE FROM_CURRENCY=? AND TO_CURRENCY=? AND EXCHANGE_DATE=?";

    private final static Log logger = LogFactory.getLog(ExchangeRate.class);

    @Autowired
    private DataSource dataSource;

    /* (non-Javadoc)
     * @see org.springframework.batch.item.ItemProcessor#process(java.lang.Object)
     */
    @Override
    public ExchangeRate process(ExchangeRate item) throws Exception {
        String from = item.getFrom();
        String to = item.getTo();

        List<Long> list = new JdbcTemplate(dataSource).queryForList(FIND_EXCHANGE_RATE, Long.class, to, from,
                item.getDate());
        if (!CollectionUtils.isEmpty(list)) {
            logger.trace("There already was a reversed entry for " + from + ":" + "to");
            return null;
        }
        ExchangeRate exchangeRate = new ExchangeRate();
        exchangeRate.setTo(from);
        exchangeRate.setFrom(to);
        exchangeRate.setDate(item.getDate());
        exchangeRate.setExchangeRate(1 / item.getExchangeRate());
        return exchangeRate;
    }

}