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81 lines
2.0 KiB
Java
81 lines
2.0 KiB
Java
/* ========================================================================
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* PlantUML : a free UML diagram generator
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* ========================================================================
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*
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* (C) Copyright 2009-2024, Arnaud Roques
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*
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* Project Info: https://plantuml.com
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*
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* If you like this project or if you find it useful, you can support us at:
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*
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* https://plantuml.com/patreon (only 1$ per month!)
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* https://plantuml.com/paypal
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*
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* This file is part of PlantUML.
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*
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* PlantUML is free software; you can redistribute it and/or modify it
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* 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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* PlantUML distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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* License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
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* USA.
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*
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*
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* Original Author: Arnaud Roques
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*
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*
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*/
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package net.sourceforge.plantuml.project;
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public class Failable<O> {
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private final O data;
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private final String error;
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public static <O> Failable<O> ok(O data) {
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return new Failable<>(data, null);
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}
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public static <O> Failable<O> error(String error) {
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return new Failable<>(null, error);
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}
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private Failable(O data, String error) {
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if (data == null && error == null) {
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throw new IllegalArgumentException();
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}
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if (data != null && error != null) {
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throw new IllegalArgumentException();
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}
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this.data = data;
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this.error = error;
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}
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public O get() {
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if (data == null) {
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throw new IllegalStateException();
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}
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return data;
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}
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public boolean isFail() {
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return data == null;
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}
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public String getError() {
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if (error == null) {
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throw new IllegalStateException();
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}
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return error;
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}
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}
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