001/**
002 * Copyright (c) 2025-2026, Michael Yang 杨福海 (fuhai999@gmail.com).
003 * <p>
004 * Licensed under the GNU Lesser General Public License (LGPL) ,Version 3.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 * <p>
008 * http://www.gnu.org/licenses/lgpl-3.0.txt
009 * <p>
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016package dev.tinyflow.core.knowledge;
017
018
019import java.util.ArrayList;
020import java.util.List;
021
022public class KnowledgeManager {
023
024    public List<KnowledgeProvider> providers = new ArrayList<>();
025
026    private static class ManagerHolder {
027        private static final KnowledgeManager INSTANCE = new KnowledgeManager();
028    }
029
030    private KnowledgeManager() {
031    }
032
033    public static KnowledgeManager getInstance() {
034        return ManagerHolder.INSTANCE;
035    }
036
037    public void registerProvider(KnowledgeProvider provider) {
038        providers.add(provider);
039    }
040
041    public void removeProvider(KnowledgeProvider provider) {
042        providers.remove(provider);
043    }
044
045    public Knowledge getKnowledge(Object knowledgeId) {
046        for (KnowledgeProvider provider : providers) {
047            Knowledge knowledge = provider.getKnowledge(knowledgeId);
048            if (knowledge != null) {
049                return knowledge;
050            }
051        }
052        return null;
053    }
054}