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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
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 * database integrations.
 *
 * For more information, please visit: http://www.jooq.org/licenses
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package org.jooq.util;

import java.util.List;

/**
 * A model for all known Referenced Key / Referencing Key relations in the
 * {@link Database}'s schema.
 *
 * @author Lukas Eder
 */
public interface Relations {

    /**
     * Get the the primary for a given column, or null if that
     * column is not part of the primary key.
     */
    UniqueKeyDefinition getPrimaryKey(ColumnDefinition column);

    /**
     * Get a list of referenced keys (primary or unique) for a given table, that
     * the column participates in. Returns an empty list if the given column is
     * not part of any primary key or unique key.
     */
    List getUniqueKeys(ColumnDefinition column);

    /**
     * Get a list of referenced keys (primary or unique) for a given table.
     * Returns an empty list if the given table has no primary or unique keys.
     */
    List getUniqueKeys(TableDefinition table);

    /**
     * Get a list of all referenced keys (primary or unique) for a given schema.
     * Returns an empty list if the given schema has no primary or unique keys.
     */
    List getUniqueKeys(SchemaDefinition schema);

    /**
     * Get a list of all referenced keys (primary or unique). Returns an empty
     * list if there are no primary or unique keys.
     */
    List getUniqueKeys();

    /**
     * Get a list of foreign keys for a given table, that the column
     * participates in. Returns an empty list if the given column is not part of
     * any foreign key.
     */
    List getForeignKeys(ColumnDefinition column);

    /**
     * Get a list of foreign keys for a given table. Returns an empty list if
     * the given table has no foreign keys.
     */
    List getForeignKeys(TableDefinition table);

    /**
     * Get a list of CHECK constraints for a given table. Returns
     * an empty list if the given table has no CHECK constraints.
     */
    List getCheckConstraints(TableDefinition table);
}