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HSQLDB - Lightweight 100% Java SQL Database Engine
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/* Copyright (c) 2001-2019, The HSQL Development Group
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * Redistributions of source code must retain the above copyright notice, this
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package org.hsqldb;

import org.hsqldb.HsqlNameManager.HsqlName;
import org.hsqldb.index.Index;

/**
 * This class consists of the data structure for a Constraint. This
 * structure is shared between two Constraint Objects that together form a
 * foreign key constraint. This simplifies structural modifications to a
 * table. When changes to the column indexes are applied to the table's
 * Constraint Objects, they are reflected in the Constraint Objects of any
 * other table that shares a foreign key constraint with the modified
 * table.
 *
 * @author Fred Toussi (fredt@users dot sourceforge.net)
 * @version 1.9.0
 * @since 1.7.1
 */
class ConstraintCore {

    // refName and mainName are for foreign keys only
    HsqlName refName;
    HsqlName mainName;
    HsqlName uniqueName;
    HsqlName refTableName;
    HsqlName mainTableName;

    // Main is the sole table in a UNIQUE or PRIMARY constraint
    // Or the table that is referenced by FOREIGN KEY ... REFERENCES
    Table mainTable;
    int[] mainCols;
    Index mainIndex;

    // Ref is the table that has a reference to the main table
    Table   refTable;
    int[]   refCols;
    Index   refIndex;
    int     deleteAction;
    int     updateAction;
    boolean hasUpdateAction;
    boolean hasDeleteAction;
    int     matchType;

    //
    ConstraintCore duplicate() {

        ConstraintCore copy = new ConstraintCore();

        copy.refName      = refName;
        copy.mainName     = mainName;
        copy.uniqueName   = uniqueName;
        copy.mainTable    = mainTable;
        copy.mainCols     = mainCols;
        copy.mainIndex    = mainIndex;
        copy.refTable     = refTable;
        copy.refCols      = refCols;
        copy.refIndex     = refIndex;
        copy.deleteAction = deleteAction;
        copy.updateAction = updateAction;
        copy.matchType    = matchType;

        return copy;
    }
}