package org.andromda.metafacades.emf.uml22;
   
   import java.util.Collection;
   import java.util.Iterator;
   import java.util.List;
   import org.andromda.metafacades.uml.AssociationEndFacade;
   import org.andromda.metafacades.uml.MetafacadeUtils;
   import org.andromda.metafacades.uml.UMLMetafacadeProperties;
   import org.apache.commons.collections.CollectionUtils;
  import org.apache.commons.lang.StringUtils;
  import org.eclipse.uml2.uml.Association;
  import org.eclipse.uml2.uml.AssociationClass;
  
  /**
   * MetafacadeLogic implementation for
   * org.andromda.metafacades.uml.AssociationFacade.
   *
   * @see org.andromda.metafacades.uml.AssociationFacade
   */
  public class AssociationFacadeLogicImpl
      extends AssociationFacadeLogic
  {
      private static final long serialVersionUID = 34L;
      /**
       * @param metaObject
       * @param context
       */
      public AssociationFacadeLogicImpl(
          final Association metaObject,
          final String context)
      {
          super(metaObject, context);
      }
  
      /**
       * @see org.andromda.metafacades.uml.AssociationFacade#getRelationName()
       */
      @Override
      protected String handleGetRelationName()
      {
          final Collection<AssociationEndFacade> ends = this.getAssociationEnds();
          final Iterator<AssociationEndFacade> endIt = ends.iterator();
          final AssociationEndFacade firstEnd = endIt.next();
          final AssociationEndFacade secondEnd = endIt.next();
          return MetafacadeUtils.toRelationName(
              firstEnd==null ? "" :firstEnd.getName(),
              secondEnd==null ? "" : secondEnd.getName(),
              String.valueOf(this.getConfiguredProperty(UMLMetafacadeProperties.RELATION_NAME_SEPARATOR)));
      }
  
      /**
       * Overridden: A name may not have a name, which
       * is problematic for getSqlName (for an EntityAssociation).
       * We use the relation name as default
       * @see org.andromda.metafacades.emf.uml22.ModelElementFacadeLogic#handleGetName()
       */
      @Override
      public String handleGetName()
      {
          String name = super.handleGetName();
  
          // if the name isn't defined, use the relation name
          if (StringUtils.isBlank(name))
          {
              name = this.getRelationName();
          }
          return name;
      }
      /**
       * @see org.andromda.metafacades.uml.AssociationFacade#isMany2Many()
       */
      @Override
      protected boolean handleIsMany2Many()
      {
          return (this.getAssociationEnds().iterator().next()).isMany2Many();
      }
  
      /**
       * @see org.andromda.metafacades.uml.AssociationFacade#getAssociationEnds()
       */
      @Override
      protected List<AssociationEndFacade> handleGetAssociationEnds()
      {
          return (List)CollectionUtils.collect(
              this.metaObject.getMemberEnds(),
              UmlUtilities.ELEMENT_TRANSFORMER);
      }
  
      /**
       * @see org.andromda.metafacades.uml.AssociationFacade#isAssociationClass()
       */
      @Override
      protected boolean handleIsAssociationClass()
      {
          // TODO: Test this if it works.
          return AssociationClass.class.isAssignableFrom(this.metaObject.getClass());
      }
  
      /**
      * @see org.andromda.metafacades.uml.AssociationFacade#getAssociationEndA()
      */
     @Override
     protected AssociationEndFacade handleGetAssociationEndA()
     {
         if (!this.getAssociationEnds().isEmpty())
         {
             return this.getAssociationEnds().get(0);
         }
         return null;
     }
 
     /**
      * @see org.andromda.metafacades.uml.AssociationFacade#getAssociationEndB()
      */
     @Override
     protected AssociationEndFacade handleGetAssociationEndB()
     {
         if (this.getAssociationEnds().size()>1)
         {
             return this.getAssociationEnds().get(1);
         }
         return null;
     }
 
     /**
      * @see org.andromda.metafacades.uml.AssociationFacade#isAbstract()
      */
     @Override
     protected boolean handleIsAbstract()
     {
         return this.metaObject.isAbstract();
     }
 
     /**
      * @see org.andromda.metafacades.uml.AssociationFacade#isBinary()
      */
     @Override
     protected boolean handleIsBinary()
     {
         return this.metaObject.isBinary();
     }
 
     /**
      * @see org.andromda.metafacades.uml.AssociationFacade#isDerived()
      */
     @Override
     protected boolean handleIsDerived()
     {
         return this.metaObject.isDerived();
     }
 
     /**
      * @see org.andromda.metafacades.uml.AssociationFacade#isLeaf
      */
     @Override
     protected boolean handleIsLeaf()
     {
         return this.metaObject.isLeaf();
     }
 }