/*
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
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 *
 * Other licenses:
 * -----------------------------------------------------------------------------
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 * commercial database integrations.
 *
 * For more information, please visit: https://www.jooq.org/legal/licensing
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package org.jooq.meta;

import java.util.List;

/**
 * An object holding information about an inverse foreign key relationship.
 * <p>
 * This object may either represent a primary key or a unique key. It holds a
 * list of foreign keys referencing this key.
 *
 * @author Lukas Eder
 */
public interface UniqueKeyDefinition extends ConstraintDefinition {

    /**
     * Whether this unique key is the primary key
     */
    boolean isPrimaryKey();

    /**
     * The list of columns making up the primary key.
     */
    List<ColumnDefinition> getKeyColumns();

    /**
     * The foreign keys referencing this primary key
     */
    List<ForeignKeyDefinition> getForeignKeys();

    /**
     * Resolve a referenced key.
     * <p>
     * If this key coincides with a foreign key, resolve that foreign key
     * recursively. In case of ambiguity (two foreign keys coinciding with a
     * single unique key), this returns <code>null</code>.
     */
    UniqueKeyDefinition resolveReferencedKey();

}
