smart-domain/src/main/java/com/smartitengineering/domain/AbstractGenericPersistentDTO.java

   1 /*
   2  * This is a common dao with basic CRUD operations and is not limited to any
   3  * persistent layer implementation
   4  *
   5  * Copyright (C) 2008  Imran M Yousuf (imyousuf@smartitengineering.com)
   6  *
   7  * This library is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 3 of the License, or (at your option) any later version.
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  * You should have received a copy of the GNU Lesser General Public
  16  * License along with this library; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
  18  */
  19 package com.smartitengineering.domain;
  20
  21 import java.io.Serializable;
  22
  23 /**
  24  *
  25  * @author imyousuf
  26  */
  27 public abstract class AbstractGenericPersistentDTO<Template extends PersistentDTO, IdType extends Comparable<IdType> & Serializable, VersionType extends Comparable<VersionType> & Serializable>
  28     implements
  29     PersistentDTO<PersistentDTO, IdType, VersionType> {
  30
  31   private IdType id;
  32   private VersionType version;
  33
  34   protected AbstractGenericPersistentDTO() {
  35   }
  36
  37   @Override
  38   public IdType getId() {
  39     return id;
  40   }
  41
  42   @Override
  43   public void setId(IdType id) {
  44     this.id = id;
  45   }
  46
  47   @Override
  48   public VersionType getVersion() {
  49     return version;
  50   }
  51
  52   @Override
  53   public void setVersion(VersionType version) {
  54     this.version = version;
  55   }
  56
  57   @Override
  58   public int compareTo(PersistentDTO o) {
  59     if (o == null) {
  60       throw new IllegalArgumentException();
  61     }
  62     if (o.getId() == null && id == null) {
  63       return -1;
  64     }
  65     if (o.getId() == null && id != null) {
  66       return 1;
  67     }
  68     if (o.getId() != null && id == null) {
  69       return -1;
  70     }
  71     if (id.getClass().isAssignableFrom(o.getId().getClass())) {
  72       IdType tmp = (IdType) o.getId();
  73       return tmp.compareTo(id);
  74     }
  75     else {
  76       return o.getId().toString().compareTo(id.toString());
  77     }
  78   }
  79
  80   @Override
  81   public int compare(PersistentDTO o1, PersistentDTO o2) {
  82     if (o1 == null && o2 == null) {
  83       return 0;
  84     }
  85     if (o1 == null && o2 != null) {
  86       return -1;
  87     }
  88     if (o1 != null && o2 == null) {
  89       return 1;
  90     }
  91     return o1.compareTo(o2);
  92   }
  93
  94   @Override
  95   public boolean equals(Object obj) {
  96     if (obj == null) {
  97       return false;
  98     }
  99     if (!PersistentDTO.class.isAssignableFrom(obj.getClass())) {
 100       return false;
 101     }
 102     final PersistentDTO other = (PersistentDTO) obj;
 103     return compareTo(other) == 0;
 104   }
 105
 106   @Override
 107   public int hashCode() {
 108     int hash = 3;
 109     hash = 23 * hash + (this.id != null ? this.id.hashCode() : 0);
 110     hash = 23 * hash + (this.version != null ? this.version.hashCode() : 0);
 111     return hash;
 112   }
 113
 114   protected void clone(Template template) {
 115     if (template == null) {
 116       return;
 117     }
 118     template.setId(id);
 119     template.setVersion(version);
 120   }
 121 }