/*
    * 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
    *
    *     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.
   */
  
  package org.apache.commons.configuration2.spring;
  
  import java.util.ArrayList;
  import java.util.List;
  
  import org.apache.commons.configuration2.Configuration;
  import org.apache.commons.lang3.ArrayUtils;
  import org.springframework.core.env.EnumerablePropertySource;
  
  /**
   * Allow use of Apache Commons Configuration Objects as Spring PropertySources
   */
  public class ConfigurationPropertySource extends EnumerablePropertySource<Configuration> {
  
      protected ConfigurationPropertySource(final String name) {
          super(name);
      }
  
      public ConfigurationPropertySource(final String name, final Configuration source) {
          super(name, source);
      }
  
      @Override
      public Object getProperty(final String name) {
          if (source.getProperty(name) != null) {
              final String[] propValue = source.getStringArray(name);
              if (propValue == null || propValue.length == 0) {
                  return "";
              } else if (propValue.length == 1) {
                  return propValue[0];
              } else {
                  return propValue;
              }
          } else {
              return null;
          }
      }
  
      @Override
      public String[] getPropertyNames() {
          final List<String> keys = new ArrayList<>();
          source.getKeys().forEachRemaining(keys::add);
          return keys.toArray(ArrayUtils.EMPTY_STRING_ARRAY);
      }
  }