Clones the lhs map and add all things from the rhs map. : Collection « Collections Data Structure « Java

1. Java
2. Collections Data Structure
3. Collection

Clones the lhs map and add all things from the rhs map.

    
import java.util.HashMap;
import java.util.Map;


public class Main {
  /**
   * Clones the lhs map and add all things from the
   * rhs map.
   *
   * @param lhs the first map
   * @param rhs the second map
   * @return the merged map
   */
  public static Map merge(Map lhs, Map rhs) {

      Map result = null;

      if((lhs == null) || (lhs.size() == 0)) {
          result = copy(rhs);
      }
      else if((rhs == null) || (rhs.size() == 0)) {
          result = copy(lhs);
      }
      else {
          result = copy(lhs);
          result.putAll(rhs);
      }
      
      return result;
  }
  /**
   * Clones a map.
   *
   * @param source the source map
   * @return the clone of the source map
   */
  public static Map copy(Map source) {

      if(source == null) {
          return null;
      }

      Map result = new HashMap();
      result.putAll(source);
      return result;
  }

}

   
    
    
    
  

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