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60 lines
1.9 KiB
60 lines
1.9 KiB
##
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# \file
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# To each interface a set of caller functions exist, that take an instance
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# of an object and then in turn call the implementation for the class of
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# this object. If there is none within the class it looks into its
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# parent class and so forth.
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#
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# This is somewhat similar to late binding in real OOP languages, but
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# by far not so elaborated. This is not a real object oriented language
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# and will surely never ever provide all features these have.
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#
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# That said it has proven very usefull for me to orgnize code and prevent
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# code duplication.
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#
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# \author Georg Hopp
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#
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# \copyright
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# Copyright © 2014 Georg Hopp
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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has_class() {
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if [ 1 -ne $# ]
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then
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logger -p syslog.err 'has_class: no class given'
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exit 1
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fi
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local CHECK=" ${CLASSES}"
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test "${CHECK}" != "${CHECK% ${1} *}"
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}
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##
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# add one or more classes given as arguments to this function
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# Using ${@} here effectively eliminates multiple spaces between
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# the classnames.
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# A class might be defined multiple times...I don't eliminate these
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# duplicates as this might involve calling uniq which is unneccesary
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# overhead as I see no harm in duplicates now.
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#
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set_class() {
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[ -z "${CLASSES}" ] &&
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{ CLASSES="${@}"; export CLASSES; } ||
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CLASSES="${CLASSES} ${@}"
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}
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# vim: set ts=4 sw=4:
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