90 lines
5.3 KiB
Rexx
Executable File
90 lines
5.3 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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/* dynamicMethod.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 now methods can be dynamically added to an */
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/* object instance. */
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/******************************************************************************/
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-- the dynamic var instance does not have "FOO" or "FOO=" attribute methods
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-- initially
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d = .dynamicvar~new
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-- verify the methods are not there
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if d~hasMethod("FOO") | d~hasMethod("FOO=") then say "An object of type" d~class~id "has FOO methods"
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else say "No FOO methods found on an object of type" d~class~id
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-- now set a FOO value and display it. This will dynamically create the
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-- methods.
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d~foo = 123
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say
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say "Value of FOO is" d~foo
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say
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-- verify the methods ARE there
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if d~hasMethod("FOO") | d~hasMethod("FOO=") then say "An object of type" d~class~id "has FOO methods"
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else say "No FOO methods found on an object of type" d~class~id
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-- a class that allows dynamic variables. Since this is a mixin, this
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-- capability can be added to any class using multiple inheritance
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::class dynamicvar MIXINCLASS object
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-- the unknown method will get invoked any time an unknown method is
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-- used. This UNKNOWN method will add attribute methods for the given
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-- name that will be available on all subsequent uses.
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::method unknown
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use strict arg messageName, arguments
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-- check for an assignment or fetch, and get the proper
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-- method name
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if messageName~right(1) == '=' then do
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variableName = messageName~left(messageName~length - 1)
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end
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else do
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variableName = messageName
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end
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-- define a pair of methods to set and retrieve the instance variable. These are
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-- created at the object scope
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self~setMethod(variableName, 'expose' variableName'; return' variableName)
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self~setMethod(variableName'=', 'expose' variableName'; use strict arg value;' variableName '= value' )
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-- reinvoke the original message. This will now go to the dynamically added methods
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forward to(self) message(messageName) arguments(arguments)
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