/*
 *  Licensed to the Apache Software Foundation (ASF) under one
 *  or more contributor license agreements.  See the NOTICE file
 *  distributed with this work for additional information
 *  regarding copyright ownership.  The ASF licenses this file
 *  to you 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
 *
 *    https://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.grails.orm.hibernate.cfg.domainbinding.util;

import java.util.Collections;
import java.util.List;

import org.hibernate.mapping.Column;
import org.hibernate.mapping.Table;
import org.hibernate.mapping.UniqueKey;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class UniqueKeyForColumnsCreator {

    private static final Logger LOG = LoggerFactory.getLogger(UniqueKeyForColumnsCreator.class);
    private final UniqueNameGenerator uniqueNameGenerator;

    public UniqueKeyForColumnsCreator() {
        uniqueNameGenerator = new UniqueNameGenerator();
    }

    protected UniqueKeyForColumnsCreator(UniqueNameGenerator uniqueNameGenerator) {
        this.uniqueNameGenerator = uniqueNameGenerator;
    }

    public void createUniqueKeyForColumns(Table table, List<Column> columns) {
        Collections.reverse(columns);

        UniqueKey uk = new UniqueKey(table);
        for (Column column : columns) {
            uk.addColumn(column);
        }

        if (LOG.isDebugEnabled()) {
            LOG.debug("create unique key for {} columns = {}", table.getName(), columns);
        }
        uniqueNameGenerator.setGeneratedUniqueName(uk);
        table.addUniqueKey(uk);
    }
}
