org.vader.apm.dao.util.DaoUtils.java Source code

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Here is the source code for org.vader.apm.dao.util.DaoUtils.java

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/*
 * Copyright 2014. Vadim Baranov
 *
 *    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 org.vader.apm.dao.util;

import com.google.common.collect.Collections2;
import com.google.common.collect.Sets;
import org.apache.commons.lang3.Validate;
import org.springframework.jdbc.core.JdbcTemplate;
import org.vader.apm.domain.ApmDbObject;

import java.util.Collection;
import java.util.List;

/**
 * @author Vadim Baranov
 */
public final class DaoUtils {
    /**
     * Asserts that only one row has been modified.
     *
     * @param rows modified rows number
     */
    public static void assertOne(int rows) {
        Validate.isTrue(1 == rows, String.format("Only one row must be modified, but - %s", rows));
    }

    /**
     * Asserts that object is in specified state.
     *
     * @param state state to check against
     * @param dbObject object to assert
     */
    public static void assertObjectState(DbObjectState state, ApmDbObject dbObject) {
        Validate.isTrue(state.apply(dbObject), "DB object must be %s", state);
    }

    /**
     * Filter all objects by type.
     *
     * @param dbObjects objects to filter
     * @param state DB object state
     * @param <T> DB object type
     * @return filtered objects
     */
    public static <T extends ApmDbObject> Collection<T> getDbObjectsByState(Collection<T> dbObjects,
            DbObjectState state) {
        final Collection<T> result = Sets.newIdentityHashSet();
        result.addAll(Collections2.filter(dbObjects, state));
        return result;
    }

    /**
     * Get sequence next N values.
     *
     * @param seqName sequence name
     * @param count values count
     * @param jdbcTemplate JDBC template
     * @return N next values
     */
    public static List<Long> getSeqNextNVal(String seqName, int count, JdbcTemplate jdbcTemplate) {
        final String sql = "WITH RECURSIVE result(seq_value, level) AS (VALUES (nextval(?), 1) UNION ALL "
                + "SELECT nextval(?), level + 1 FROM result WHERE level < ?) SELECT seq_value FROM result";
        return jdbcTemplate.queryForList(sql, Long.class, seqName, seqName, count);
    }

    private DaoUtils() {
    }
}