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  package org.apache.cayenne.exp.property;
  
  import java.util.Map;
  
  import org.apache.cayenne.CayenneRuntimeException;
  import org.apache.cayenne.ObjectId;
  import org.apache.cayenne.exp.Expression;
  import org.apache.cayenne.exp.ExpressionFactory;
  
  /**
   * Base class for properties mapped to PK
   * @since 4.2
   */
  public interface IdProperty<E> extends Property<E> {
  
      default Expression eq(ObjectId value) {
          if(!getEntityName().equals(value.getEntityName())) {
              throw new CayenneRuntimeException("Can match IdProperty only with ObjectId for same entity");
          }
          Map<String, Object> idSnapshot = value.getIdSnapshot();
          Object pkValue;
          if(getAttributeName() == null) {
              if (idSnapshot.size() > 1) {
                  throw new CayenneRuntimeException("Can't match IdProperty with compound PK");
              }
              pkValue = idSnapshot.values().iterator().next();
          } else {
              pkValue = idSnapshot.get(getAttributeName());
              if(pkValue == null && !idSnapshot.containsKey(getAttributeName())) {
                  throw new CayenneRuntimeException("No PK attribute %s for ObjectId %s", getAttributeName(), value);
              }
          }
          return ExpressionFactory.matchExp(getExpression(), pkValue);
      }
  
      String getEntityName();
  
      String getAttributeName();
  
  }
  