# DecimalExpr.java

    /*
    ** Module   : DecimalExpr.java
    ** Abstract : Resolvable interface adapter for a decimal runtime expression
    **
    ** Copyright (c) 2016-2017, Golden Code Development Corporation.
    **
    ** -#- -I- --Date-- --------------------------------Description---------------------------------
    ** 001 GES 20160824 Created initial version.
    ** 002 IAS 20161012 Added QueryParam marker interface.
    ** 003 ECF 20170828 Minor correction to abstract description.
    */
    /*
    ** This program is free software: you can redistribute it and/or modify
    ** it under the terms of the GNU Affero General Public License as
    ** published by the Free Software Foundation, either version 3 of the
    ** License, or (at your option) any later version.
    **
    ** This program is distributed in the hope that it will be useful,
    ** but WITHOUT ANY WARRANTY; without even the implied warranty of
    ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    ** GNU Affero General Public License for more details.
    **
    ** You may find a copy of the GNU Affero GPL version 3 at the following
    ** location: https://www.gnu.org/licenses/agpl-3.0.en.html
    **
    ** Additional terms under GNU Affero GPL version 3 section 7:
    **
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    */

    package com.goldencode.p2j.persist;

    import com.goldencode.p2j.util.*;

    /**
     * A convenience interface to make a {@link Resolvable} runtime expression which must return a
     * {@link decimal} result.  Users need implement only the {@link #resolve} method.
     * <p>
     * Since there is only a single method that is abstract, it is suitable to use this as a
     * functional interface (which can be used as a lambda).
     */
    @FunctionalInterface
    public interface DecimalExpr
    extends Resolvable,
            QueryParam
    {
       /**
        * Report the return type expected from executing the expression.
        *
        * @return  Class indicating the type which will be returned by the expression.  Must be a
        *          variant of {@link BaseDataType}.
        */
       public default Class getType()
       {
          return decimal.class;
       }
    }