/*
 * Copyright 2006-2025 www.anyline.org
 *
 * 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.anyline.metadata;

import java.io.Serializable;
import java.util.LinkedHashMap;

public class PrimaryKey extends Index<PrimaryKey> implements Serializable {
    private static final long serialVersionUID = 1L;
    protected String keyword = "PrimaryKey";
    public PrimaryKey() {
        primary = true;
    }
    public boolean isPrimary() {
        return true;
    }

    public PrimaryKey addColumn(Column column) {
        if(null == columns) {
            columns = new LinkedHashMap<>();
        }
        column.setNullable(false);
        columns.put(column.getName().toUpperCase(), column);
        return this;
    }
    public String keyword() {
        return this.keyword;
    }

/* ********************************* field refer ********************************** */
    public static final String FIELD_KEYWORD                       = "KEYWORD";
}