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   *   Licensed to the Apache Software Foundation (ASF) under one
   *  or more contributor license agreements.  See the NOTICE file
   *  distributed with this work for additional information
   *  regarding copyright ownership.  The ASF licenses this file
   *  to you under the Apache License, Version 2.0 (the
   *  "License"); you may not use this file except in compliance
   *  with the License.  You may obtain a copy of the License at
   *
   *    https://www.apache.org/licenses/LICENSE-2.0
   *
   *  Unless required by applicable law or agreed to in writing,
   *  software distributed under the License is distributed on an
   *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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   ****************************************************************/
  package org.apache.cayenne.modeler.graph;
  
  import java.io.Serializable;
  import java.util.Objects;
  
  import org.apache.cayenne.map.Attribute;
  import org.apache.cayenne.map.Entity;
  import org.apache.cayenne.map.Relationship;
  
  /**
   * Abstract class to describe entity's cell 
   */
  abstract class EntityCellMetadata<E extends Entity<E, A, R>, A extends Attribute<E, A, R>, R extends Relationship<E, A, R>>
          implements Serializable {
      final GraphBuilder<E,A,R> builder;
      final String entityName;
      final String label;
      
      EntityCellMetadata(GraphBuilder<E,A,R> builder, Entity<E,A,R> entity) {
          this.builder = Objects.requireNonNull(builder);
          this.entityName = Objects.requireNonNull(entity).getName();
          this.label = createLabel(entity);
      }
          
      /**
       * Resolves entity
       */
      public abstract Entity<E, A, R> fetchEntity();
  
      public String toString() {
          return label;
      }
      
      /**
       * Creates label for this cell
       */
      String createLabel(Entity<E, A, R> entity) {
          StringBuilder label = new StringBuilder("<html><center><u><b>")
                  .append(entity.getName())
                  .append("</b></u></center>");
          for (A attr : entity.getAttributes()) {
              if (isPrimary(attr)) {
                  label.append("<br><i>").append(attr.getName()).append("</i>");
              }
          }
          for (A attr : entity.getAttributes()) {
              if (!isPrimary(attr)) {
                  label.append("<br>").append(attr.getName());
              }
          }
          return label.append("</html>").toString();
      }
      
      /**
       * Returns whether attribute is "primary" and should therefore be written in italic
       */
      protected abstract boolean isPrimary(A attr);
  }
  