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/*
 * 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.
 *
 * Other licenses:
 * -----------------------------------------------------------------------------
 * Commercial licenses for this work are available. These replace the above
 * ASL 2.0 and offer limited warranties, support, maintenance, and commercial
 * database integrations.
 *
 * For more information, please visit: http://www.jooq.org/licenses
 *
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 */
package org.jooq.meta;

import java.util.List;

/**
 * An object holding information about a foreign key relationship.
 *
 * @author Lukas Eder
 */
public interface ForeignKeyDefinition extends ConstraintDefinition {

    /**
     * The definition of the referencing table
     *
     * @deprecated - [#9672] - jOOQ 3.13 - Use {@link ConstraintDefinition#getTable()} instead.
     */
    @Deprecated
    TableDefinition getKeyTable();

    /**
     * The list of columns making up the foreign key.
     */
    List getKeyColumns();

    /**
     * The referenced key.
     */
    UniqueKeyDefinition getReferencedKey();

    /**
     * Resolve a referenced key.
     * 
     * If {@link #getReferencedKey()} coincides itself with a foreign key,
     * resolve that foreign key recursively. In case of ambiguity (two foreign
     * keys coinciding with a single unique key), this returns
     * null.
     */
    UniqueKeyDefinition resolveReferencedKey();

    /**
     * The definition of the referenced table.
     */
    TableDefinition getReferencedTable();

    /**
     * The list of columns referenced by this foreign key
     */
    List getReferencedColumns();

    /**
     * Count the number of references between referencing and referenced tables.
     */
    int countSimilarReferences();
}