107 lines
5.1 KiB
Rexx
Executable File
107 lines
5.1 KiB
Rexx
Executable File
#!@OOREXX_SHEBANG_PROGRAM@
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/*----------------------------------------------------------------------------*/
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/* */
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/* Copyright (c) 2005-2014 Rexx Language Association. All rights reserved. */
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/* */
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/* This program and the accompanying materials are made available under */
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/* the terms of the Common Public License v1.0 which accompanies this */
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/* distribution. A copy is also available at the following address: */
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/* https://www.oorexx.org/license.html */
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/* */
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/* Redistribution and use in source and binary forms, with or */
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/* without modification, are permitted provided that the following */
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/* conditions are met: */
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/* */
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/* Redistributions of source code must retain the above copyright */
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/* notice, this list of conditions and the following disclaimer. */
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/* Redistributions in binary form must reproduce the above copyright */
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/* notice, this list of conditions and the following disclaimer in */
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/* the documentation and/or other materials provided with the distribution. */
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/* */
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/* Neither the name of Rexx Language Association nor the names */
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/* of its contributors may be used to endorse or promote products */
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/* derived from this software without specific prior written permission. */
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/* */
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/* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS */
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/* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT */
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/* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS */
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/* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT */
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/* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, */
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/* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED */
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/* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, */
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/* OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY */
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/* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING */
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/* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS */
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/* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
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/* */
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/*----------------------------------------------------------------------------*/
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/******************************************************************************/
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/* interface.rex Open Object Rexx Samples */
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/* */
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/* -------------------------------------------------------------------------- */
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/* */
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/* Description: */
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/* This program demonstrates to define an interface class in ooRexx. */
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/* object instance. */
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/******************************************************************************/
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-- shape is the interface class that defines the methods a shape instance
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-- is expected to implement as abstract methods. Instances of the shape
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-- class need not directly subclass the interface, but can use multiple
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-- inheritance to mark itself as implementing the interface.
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r=.rectangle~new(5,2)
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-- check for instance of
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if r~isa(.shape) then say "a" r~name "is a shape"
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say "r~area:" r~area
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say
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c=.circle~new(2)
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-- check for instance of shape works even if inherited
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if c~isa(.shape) then say "a" c~name "is a shape"
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say "c~area:" c~area
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say
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-- a mixin is still a class and can be instantiated. The abstract methods
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-- will give an error if invoked
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g=.shape~new
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if g~isa(.shape) then say "a" g~class~id "is a shape"
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-- invoking abstract method results in a runtime error.
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say g~name
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say "g~area:" g~area
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-- the "MIXINCLASS" tag makes this avaiable for multiple inhertance
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::class shape MIXINCLASS Object
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::method area abstract
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::method name abstract
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-- directly subclassing the interface
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-- to create a rectangle
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::class rectangle subclass shape
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::method init
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expose length width
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use strict arg length=0, width=0
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::method area
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expose length width
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return length*width
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::method name
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return "Rectangle"
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-- inherits the shape methods
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::class circle subclass object inherit shape
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::method init
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expose radius
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use strict arg radius=0
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::method area
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expose radius
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numeric digits 20
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return radius*radius*3.14159265358979323846
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::method name
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return "Circle"
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