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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one or more
3    * contributor license agreements.  See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * The ASF licenses this file to You under the Apache License, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License.  You may obtain a copy of the License at
8    *
9    *      http://www.apache.org/licenses/LICENSE-2.0
10   *
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS,
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   * See the License for the specific language governing permissions and
15   * limitations under the License.
16   */
17  
18  package org.apache.commons.imaging.test;
19  
20  import java.util.ArrayList;
21  
22  import org.apache.commons.imaging.common.RationalNumber;
23  import org.apache.commons.imaging.icc.IccTag;
24  import org.openjdk.jol.info.ClassLayout;
25  
26  public class PrintShallowObjectSizes {
27  
28      public static void main(final String[] args) {
29          new PrintShallowObjectSizes().go(String.class, org.apache.commons.imaging.formats.jpeg.segments.SofnSegment.Component.class,
30                  org.apache.commons.imaging.formats.jpeg.segments.SosSegment.Component.class, RationalNumber.class, IccTag.class, ArrayList.class);
31      }
32  
33      public static void print(final Class<?>... classes) {
34          new PrintShallowObjectSizes().go(classes);
35      }
36  
37      public void go(final Class<?>... classes) {
38          for (final Class<?> cls : classes) {
39              final ClassLayout classLayout = ClassLayout.parseClass(cls);
40              System.out.println(classLayout.toPrintable());
41              System.out.printf("%s shallow size = %,d bytes%n", cls, classLayout.instanceSize());
42          }
43  
44      }
45  }