content: package org.apache.lucene.util;
  
  /**
   * 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
   * 
   * http://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 KIND, either express or implied. See the
   * License for the specific language governing permissions and limitations under
   * the License.
   */
  
  /**
   * Returns primitive memory sizes for estimating RAM usage.
   * 
   */
  public abstract class MemoryModel {
  
    /**
     * @return size of array beyond contents
     */
    public abstract int getArraySize();
  
    /**
     * @return Class size overhead
     */
    public abstract int getClassSize();
  
    /**
     * @param clazz a primitive Class - bool, byte, char, short, long, float,
     *        short, double, int
     * @return the size in bytes of given primitive Class
     */
    public abstract int getPrimitiveSize(Class<?> clazz);
  
    /**
     * @return size of reference
     */
    public abstract int getReferenceSize();
  
  }
  