Custom principal

 

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Principals can be customized and new ones can be implemented based on the java.security.Principal interface. The example below shows an implementation, SamplePrincipal, of a principal. We can customize the principals to store extra information about the user, other than just the user name.

Custom principal: SamplePrincipal.java

package redbook.sg246316.loginmodule;

import java.security.Principal;

public class SamplePrincipal implements Principal, java.io.Serializable 
{
 private String name;

 public SamplePrincipal(String name) 
 {
  if (name == null) throw new NullPointerException("illegal null input");
  this.name = name;
 }

 public String getName() 
 {
  return name;
 }

 public String toString() 
 {
  return ("SamplePrincipal:  " + name);
 }

 public boolean equals(Object o) 
 {
  if (o == null)
   return false;
  if (this == o)
   return true;
  if (!(o instanceof SamplePrincipal))
   return false;

  SamplePrincipal that = (SamplePrincipal) o;
  if (this.getName().equals(that.getName()))
   return true;
  return false;
 }

 public int hashCode() 
 {
  return name.hashCode();
 }
}

As we can see, the principal is a simple Java object with attributes, a collection of set and getter methods, and a few other supporting methods.

 

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