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  package org.apache.cayenne.lifecycle.id;
  
  import java.util.Map;
  import java.util.concurrent.ConcurrentHashMap;
  
  import org.apache.cayenne.ObjectId;
  import org.apache.cayenne.Persistent;
  import org.apache.cayenne.map.EntityResolver;
  import org.apache.cayenne.map.ObjEntity;
  
  /**
   * An object to encode/decode ObjectIds for all entities found in a mapping
   * namespace.
   * 
   * @since 3.1
   */
  public class IdCoder {
  
      protected EntityResolver entityResolver;
      protected Map<String, EntityIdCoder> coders;
  
      public IdCoder(EntityResolver entityResolver) {
          this.entityResolver = entityResolver;
          this.coders = new ConcurrentHashMap<>();
      }
  
      /**
       * Returns an ObjectId for a given String ID.
       */
      public ObjectId getObjectId(String id) {
  
          String entityName = EntityIdCoder.getEntityName(id);
          EntityIdCoder coder = getCoder(entityName);
          return coder.toObjectId(id);
      }
  
      /**
       * @since 4.0
       */
      public String getStringId(ObjectId id) {
          EntityIdCoder coder = getCoder(id.getEntityName());
          return coder.toStringId(id);
      }
  
      public String getStringId(Persistent object) {
  
          if (object == null) {
              throw new NullPointerException("Null object");
          }
  
          ObjectId id = object.getObjectId();
          return getStringId(id);
      }
  
      protected EntityIdCoder getCoder(String entityName) {
          EntityIdCoder coder = coders.get(entityName);
          if (coder == null) {
  
              coder = createCoder(entityName);
              coders.put(entityName, coder);
          }
  
          return coder;
      }
  
      protected EntityIdCoder createCoder(String entityName) {
          ObjEntity entity = entityResolver.getObjEntity(entityName);
          if (entity == null) {
              throw new IllegalArgumentException("Entity '" + entityName
                      + "' is not mapped");
          }
  
          return new EntityIdCoder(entity);
      }
  }
  