AbstractGenericPersistentDTO.java

/*
 * This is a common dao with basic CRUD operations and is not limited to any
 * persistent layer implementation
 *
 * Copyright (C) 2008  Imran M Yousuf (imyousuf@smartitengineering.com)
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 3 of the License, or (at your option) any later version.
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */
package com.smartitengineering.domain;

import java.io.Serializable;

/**
 *
 * @author imyousuf
 */
public abstract class AbstractGenericPersistentDTO<Template extends PersistentDTO, IdType extends Comparable<IdType> & Serializable, VersionType extends Comparable<VersionType> & Serializable>
    implements
    PersistentDTO<PersistentDTO, IdType, VersionType> {

  private IdType id;
  private VersionType version;

  protected AbstractGenericPersistentDTO() {
  }

  @Override
  public IdType getId() {
    return id;
  }

  @Override
  public void setId(IdType id) {
    this.id = id;
  }

  @Override
  public VersionType getVersion() {
    return version;
  }

  @Override
  public void setVersion(VersionType version) {
    this.version = version;
  }

  @Override
  public int compareTo(PersistentDTO o) {
    if (o == null) {
      throw new IllegalArgumentException();
    }
    if (o.getId() == null && getId() == null) {
      return 0;
    }
    if (o.getId() == null && getId() != null) {
      return 1;
    }
    if (o.getId() != null && getId() == null) {
      return -1;
    }
    if (getId().getClass().isAssignableFrom(o.getId().getClass())) {
      IdType tmp = (IdType) o.getId();
      return tmp.compareTo(getId());
    }
    else {
      return o.getId().toString().compareTo(getId().toString());
    }
  }

  @Override
  public int compare(PersistentDTO o1, PersistentDTO o2) {
    if (o1 == null && o2 == null) {
      return 0;
    }
    if (o1 == null && o2 != null) {
      return -1;
    }
    if (o1 != null && o2 == null) {
      return 1;
    }
    return o1.compareTo(o2);
  }

  @Override
  public boolean equals(Object obj) {
    if (obj == null) {
      return false;
    }
    if (!PersistentDTO.class.isAssignableFrom(obj.getClass())) {
      return false;
    }
    final PersistentDTO other = (PersistentDTO) obj;
    final int compareTo = compareTo(other);
    return compareTo == 0;
  }

  @Override
  public int hashCode() {
    int hash = 3;
    hash = 23 * hash + (getId() != null ? getId().hashCode() : 0);
    return hash;
  }

  protected void clone(Template template) {
    if (template == null) {
      return;
    }
    template.setId(id);
    template.setVersion(version);
  }
}