com.vectorprint.configuration.binding.settings.SettingsBindingService Maven / Gradle / Ivy

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A library for settings and parameterization of objects. Key features are support for data types, help for settings and parameters, annotations for ease of use. Settings and parameters both are Clonable and Serializable. More features for settings such as parsing a settingsfile, being observable, readonliness, caching etc. are available. The library contains javacc generated parsers for syntax support for properties, multi valued properties, parameterized objects and multi valued parameters.

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package com.vectorprint.configuration.binding.settings;

/*-
 * #%L
 * Config
 * %%
 * Copyright (C) 2015 - 2018 VectorPrint
 * %%
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * #L%
 */


import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.ArrayList;
import java.util.List;
import java.util.ServiceLoader;

public class SettingsBindingService {
   
   private static final Logger LOGGER = LoggerFactory.getLogger(SettingsBindingService.class.getName());

   private final ServiceLoader factories;
   private final ServiceLoader validators;

   private SettingsBindingService() {
      factories = ServiceLoader.load(EnhancedMapBindingFactory.class);
      validators = ServiceLoader.load(SettingsFactoryValidator.class);
   }

   private static final SettingsBindingService instance = new SettingsBindingService();

   public static SettingsBindingService getInstance() {
      return instance;
   }

   /**
    * Return the first implementation of {@link EnhancedMapBindingFactory} found that is valid according to all
    * {@link SettingsFactoryValidator}s, or return null. When no validator is published return the first {@link EnhancedMapBindingFactory} found.
    *
    * @return
    */
   public EnhancedMapBindingFactory getFactory() {
      for (EnhancedMapBindingFactory f : factories) {
         if (isValid(f)) {
            return f;
         }
      }
      return null;
   }
   
   public boolean isValid(EnhancedMapBindingFactory f ) {
         boolean ok = true;
         for (SettingsFactoryValidator validator : validators) {
            if (!validator.isValid(f)) {
               if (LOGGER.isDebugEnabled()) {
                  LOGGER.debug(String.format("%s does not pass validation by %s", f.getClass().getName(), validator.getClass().getName()));
               }
               ok = false;
               break;
            }
         }
         return ok;
   }

   /**
    * 
    * @return a list of factories found through SPI
    */
   public List> getFactoriesKnown() {
      List> l = new ArrayList<>();
      for (EnhancedMapBindingFactory f : factories) {
         l.add(f.getClass());
      }
      return l;
   }

   /**
    * 
    * @return a list of valid factories found through SPI
    */
   public List> getValidFactories() {
      List> l = new ArrayList<>();
      for (EnhancedMapBindingFactory f : factories) {
         if (isValid(f)) {
            l.add(f.getClass());
         }
      }
      return l;
   }

   /**
    * 
    * @return a list of validators found through SPI
    */
   public List> getValidatorsKnown() {
      List> l = new ArrayList<>();
      for (SettingsFactoryValidator f : validators) {
         l.add(f.getClass());
      }
      return l;
   }
}