Evan Debenham
88 lines
2.0 KiB
Java
88 lines
2.0 KiB
Java
/*
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* Pixel Dungeon
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* Copyright (C) 2012-2015 Oleg Dolya
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*
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* Shattered Pixel Dungeon
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* Copyright (C) 2014-2023 Evan Debenham
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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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package com.watabou.utils;
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import java.util.LinkedList;
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public class Signal<T> {
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private LinkedList<Listener<T>> listeners = new LinkedList<>();
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private boolean stackMode;
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public Signal() {
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this( false );
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}
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public Signal( boolean stackMode ) {
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this.stackMode = stackMode;
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}
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public synchronized void add( Listener<T> listener ) {
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if (!listeners.contains( listener )) {
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if (stackMode) {
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listeners.addFirst( listener );
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} else {
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listeners.addLast( listener );
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}
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}
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}
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public synchronized void remove( Listener<T> listener ) {
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listeners.remove( listener );
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}
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public synchronized void removeAll() {
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listeners.clear();
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}
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public synchronized void replace( Listener<T> listener ) {
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removeAll();
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add( listener );
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}
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public synchronized int numListeners() {
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return listeners.size();
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}
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public synchronized void dispatch( T t ) {
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@SuppressWarnings("unchecked")
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Listener<T>[] list = listeners.toArray( new Listener[0] );
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for (Listener<T> listener : list) {
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if (listeners.contains(listener)) {
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if (listener.onSignal(t)) {
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return;
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}
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}
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}
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}
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public interface Listener<T> {
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//return true if the signal has been handled
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boolean onSignal( T t );
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}
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}
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