io.spring.batch.JdbcSimilaritiesItemWriter.java Source code

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Here is the source code for io.spring.batch.JdbcSimilaritiesItemWriter.java

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/*
 * Copyright 2014 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 io.spring.batch;

import org.springframework.batch.item.ItemWriter;
import org.springframework.jdbc.core.JdbcOperations;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.util.Assert;

import javax.sql.DataSource;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

/**
 * @author mminella
 */
public class JdbcSimilaritiesItemWriter implements ItemWriter<Similarities> {

    private JdbcOperations jdbcTemplate;
    private static final String SQL = "INSERT INTO taste_item_similarity VALUES(?, ?, ?)";

    public JdbcSimilaritiesItemWriter(DataSource dataSource) {
        Assert.notNull(dataSource, "A datasource is required");

        this.jdbcTemplate = new JdbcTemplate(dataSource);
    }

    @Override
    public void write(List<? extends Similarities> items) throws Exception {
        List<Object[]> params = new ArrayList<Object[]>(items.size());

        for (Similarities item : items) {
            Map<Integer, Double> similarities = item.getSimilarites();

            for (Map.Entry<Integer, Double> entry : similarities.entrySet()) {
                Object[] curParams = new Object[3];

                curParams[0] = item.getTagId();
                curParams[1] = entry.getKey();
                curParams[2] = entry.getValue();

                params.add(curParams);
            }
        }

        jdbcTemplate.batchUpdate(SQL, params);
    }
}