83 lines
2.4 KiB
Java
83 lines
2.4 KiB
Java
/*
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* The MIT License
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* Copyright © 2014-2019 Ilkka Seppälä
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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package com.iluwatar.command;
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import java.util.Deque;
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import java.util.LinkedList;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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/**
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* Wizard is the invoker of the commands.
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*/
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public class Wizard {
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private static final Logger LOGGER = LoggerFactory.getLogger(Wizard.class);
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private final Deque<Command> undoStack = new LinkedList<>();
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private final Deque<Command> redoStack = new LinkedList<>();
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public Wizard() {
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// comment to ignore sonar issue: LEVEL critical
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}
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/**
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* Cast spell.
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*/
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public void castSpell(Command command, Target target) {
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LOGGER.info("{} casts {} at {}", this, command, target);
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command.execute(target);
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undoStack.offerLast(command);
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}
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/**
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* Undo last spell.
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*/
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public void undoLastSpell() {
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if (!undoStack.isEmpty()) {
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var previousSpell = undoStack.pollLast();
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redoStack.offerLast(previousSpell);
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LOGGER.info("{} undoes {}", this, previousSpell);
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previousSpell.undo();
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}
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}
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/**
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* Redo last spell.
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*/
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public void redoLastSpell() {
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if (!redoStack.isEmpty()) {
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var previousSpell = redoStack.pollLast();
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undoStack.offerLast(previousSpell);
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LOGGER.info("{} redoes {}", this, previousSpell);
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previousSpell.redo();
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}
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}
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@Override
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public String toString() {
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return "Wizard";
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}
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}
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