/*
    * Licensed to the Apache Software Foundation (ASF) under one or more
    * contributor license agreements.  See the NOTICE file distributed with
    * this work for additional information regarding copyright ownership.
    * The ASF licenses this file to You 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
    *
    *     https://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.
   */
  
  package org.apache.commons.configuration2.beanutils;
  
  import java.util.ArrayList;
  import java.util.Iterator;
  import java.util.List;
  
  import org.apache.commons.beanutils.DynaBean;
  import org.apache.commons.beanutils.DynaClass;
  import org.apache.commons.beanutils.DynaProperty;
  import org.apache.commons.configuration2.Configuration;
  import org.apache.commons.logging.Log;
  import org.apache.commons.logging.LogFactory;
  
  /**
   * The {@code ConfigurationDynaClass} dynamically determines properties for a {@code ConfigurationDynaBean} from a
   * wrapped configuration-collection {@link org.apache.commons.configuration2.Configuration} instance.
   *
   * @since 1.0-rc1
   */
  public class ConfigurationDynaClass implements DynaClass {
  
      /** The logger. */
      private static final Log LOG = LogFactory.getLog(ConfigurationDynaClass.class);
  
      /** Stores the associated configuration. */
      private final Configuration configuration;
  
      /**
       * Constructs an instance of a {@code ConfigurationDynaClass} wrapping the specified {@code Configuration} instance.
       *
       * @param configuration {@code Configuration} instance.
       */
      public ConfigurationDynaClass(final Configuration configuration) {
          if (LOG.isTraceEnabled()) {
              LOG.trace("ConfigurationDynaClass(" + configuration + ")");
          }
          this.configuration = configuration;
      }
  
      @Override
      public DynaProperty[] getDynaProperties() {
          if (LOG.isTraceEnabled()) {
              LOG.trace("getDynaProperties()");
          }
  
          final Iterator<String> keys = configuration.getKeys();
          final List<DynaProperty> properties = new ArrayList<>();
          while (keys.hasNext()) {
              final String key = keys.next();
              final DynaProperty property = getDynaProperty(key);
              properties.add(property);
          }
  
          final DynaProperty[] propertyArray = new DynaProperty[properties.size()];
          properties.toArray(propertyArray);
          if (LOG.isDebugEnabled()) {
              LOG.debug("Found " + properties.size() + " properties.");
          }
  
          return propertyArray;
      }
  
      @Override
      public DynaProperty getDynaProperty(final String name) {
          if (LOG.isTraceEnabled()) {
              LOG.trace("getDynaProperty(" + name + ")");
          }
  
          if (name == null) {
              throw new IllegalArgumentException("Property name must not be null!");
          }
  
          final Object value = configuration.getProperty(name);
          if (value == null) {
              return null;
          }
          Class<?> type = value.getClass();
  
          if (type == Byte.class) {
              type = Byte.TYPE;
          }
          if (type == Character.class) {
             type = Character.TYPE;
         } else if (type == Boolean.class) {
             type = Boolean.TYPE;
         } else if (type == Double.class) {
             type = Double.TYPE;
         } else if (type == Float.class) {
             type = Float.TYPE;
         } else if (type == Integer.class) {
             type = Integer.TYPE;
         } else if (type == Long.class) {
             type = Long.TYPE;
         } else if (type == Short.class) {
             type = Short.TYPE;
         }
 
         return new DynaProperty(name, type);
     }
 
     @Override
     public String getName() {
         return ConfigurationDynaBean.class.getName();
     }
 
     @Override
     public DynaBean newInstance() throws IllegalAccessException, InstantiationException {
         return new ConfigurationDynaBean(configuration);
     }
 }