Snippets.java

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/*
 * Turró i Cutiller Foundation. License notice.
 * Copyright (C) 2022 Lluis Turró Cutiller <http://www.turro.org/>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
package org.turro.elephant.snippet;
 
import java.util.Map;
import java.util.Optional;
import java.util.TreeMap;
import org.turro.lock.Initializer;
import org.turro.reflection.ClassNames;
import org.turro.reflection.Reflections;
 
public class Snippets {
 
  public static final String JSONPAR = "jsonpar";
  
  public static Optional<ISnippetService> service(String path) {
    Class wsclass = instance().snippets.get(path);
    if(wsclass != null) {
      return Optional.ofNullable((ISnippetService) Reflections.of(wsclass).instance());
    }
    return Optional.empty();
  }
 
  /* Factory */
  
  private static final Initializer<Snippets> INIT = new Initializer<>();
    
  public static Snippets instance() {
    return INIT.instance(() -> new Snippets());
  }
  
  public static void reset() {
    INIT.reset();
  }
 
  private final Map<String, Class> snippets;
  
  private Snippets() {
    snippets = new TreeMap<>();
    loadSnippets();
  }  
 
  private void loadSnippets() {
    for(String className : ClassNames.cached().byAnnotation(Snippet.class.getName())) {
      Class wsclass = Reflections.check(className);
      if(wsclass != null) {
        if(Reflections.of(wsclass).canCast(ISnippetService.class))  {
          snippets.put(((Snippet) wsclass.getAnnotation(Snippet.class)).path(), wsclass);
        }
      }
    }
  }
 
}