content: package com.ctrip.framework.apollo.spring.config;
  
  import com.ctrip.framework.apollo.ConfigChangeListener;
  import java.util.Set;
  
  import org.springframework.core.env.EnumerablePropertySource;
  
  import com.ctrip.framework.apollo.Config;
  
  /**
   * Property source wrapper for Config
   *
   * @author Jason Song(song_s@ctrip.com)
   */
  public class ConfigPropertySource extends EnumerablePropertySource<Config> {
    private static final String[] EMPTY_ARRAY = new String[0];
  
    ConfigPropertySource(String name, Config source) {
      super(name, source);
    }
  
    @Override
    public String[] getPropertyNames() {
      Set<String> propertyNames = this.source.getPropertyNames();
      if (propertyNames.isEmpty()) {
        return EMPTY_ARRAY;
      }
      return propertyNames.toArray(new String[propertyNames.size()]);
    }
  
    @Override
    public Object getProperty(String name) {
      return this.source.getProperty(name, null);
    }
  
    public void addChangeListener(ConfigChangeListener listener) {
      this.source.addChangeListener(listener);
    }
  }
  