https://openjdk.java.net/ 
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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package com.sun.security.auth;

import java.security.Principal;


 This class implements the Principal interface
and represents a user's Unix group identification number (GID).

 Principals such as this UnixNumericGroupPrincipal
may be associated with a particular Subject
to augment that Subject with an additional
identity.  Refer to the Subject class for more information
on how to achieve this.  Authorization decisions can then be based upon
the Principals associated with a Subject.

See Also:
/**
 * <p> This class implements the <code>Principal</code> interface
 * and represents a user's Unix group identification number (GID).
 *
 * <p> Principals such as this <code>UnixNumericGroupPrincipal</code>
 * may be associated with a particular <code>Subject</code>
 * to augment that <code>Subject</code> with an additional
 * identity.  Refer to the <code>Subject</code> class for more information
 * on how to achieve this.  Authorization decisions can then be based upon
 * the Principals associated with a <code>Subject</code>.
 *
 * @see java.security.Principal
 * @see javax.security.auth.Subject
 */
@jdk.Exported
public class UnixNumericGroupPrincipal implements
                                        Principal,
                                        java.io.Serializable {

    private static final long serialVersionUID = 3941535899328403223L;

    
@serial
/**
     * @serial
     */
    private String name;

    
@serial
/**
     * @serial
     */
    private boolean primaryGroup;

    
Create a UnixNumericGroupPrincipal using a
String representation of the user's
group identification number (GID).



Params:
  • name – the user's group identification number (GID)
                 for this user. 
  • primaryGroup – true if the specified GID represents the
                 primary group to which this user belongs.
Throws:
/**
     * Create a <code>UnixNumericGroupPrincipal</code> using a
     * <code>String</code> representation of the user's
     * group identification number (GID).
     *
     * <p>
     *
     * @param name the user's group identification number (GID)
     *                  for this user. <p>
     *
     * @param primaryGroup true if the specified GID represents the
     *                  primary group to which this user belongs.
     *
     * @exception NullPointerException if the <code>name</code>
     *                  is <code>null</code>.
     */
    public UnixNumericGroupPrincipal(String name, boolean primaryGroup) {
        if (name == null) {
            java.text.MessageFormat form = new java.text.MessageFormat
                (sun.security.util.ResourcesMgr.getString
                        ("invalid.null.input.value",
                        "sun.security.util.AuthResources"));
            Object[] source = {"name"};
            throw new NullPointerException(form.format(source));
        }

        this.name = name;
        this.primaryGroup = primaryGroup;
    }

    
Create a UnixNumericGroupPrincipal using a
long representation of the user's group identification number (GID).



Params:
  • name – the user's group identification number (GID) for this user
                 represented as a long. 
  • primaryGroup – true if the specified GID represents the
                 primary group to which this user belongs.
/**
     * Create a <code>UnixNumericGroupPrincipal</code> using a
     * long representation of the user's group identification number (GID).
     *
     * <p>
     *
     * @param name the user's group identification number (GID) for this user
     *                  represented as a long. <p>
     *
     * @param primaryGroup true if the specified GID represents the
     *                  primary group to which this user belongs.
     *
     */
    public UnixNumericGroupPrincipal(long name, boolean primaryGroup) {
        this.name = (new Long(name)).toString();
        this.primaryGroup = primaryGroup;
    }

    
Return the user's group identification number (GID) for this
UnixNumericGroupPrincipal.



Returns:the user's group identification number (GID) for this
         UnixNumericGroupPrincipal
/**
     * Return the user's group identification number (GID) for this
     * <code>UnixNumericGroupPrincipal</code>.
     *
     * <p>
     *
     * @return the user's group identification number (GID) for this
     *          <code>UnixNumericGroupPrincipal</code>
     */
    public String getName() {
        return name;
    }

    
Return the user's group identification number (GID) for this
UnixNumericGroupPrincipal as a long.



Returns:the user's group identification number (GID) for this
         UnixNumericGroupPrincipal as a long.
/**
     * Return the user's group identification number (GID) for this
     * <code>UnixNumericGroupPrincipal</code> as a long.
     *
     * <p>
     *
     * @return the user's group identification number (GID) for this
     *          <code>UnixNumericGroupPrincipal</code> as a long.
     */
    public long longValue() {
        return ((new Long(name)).longValue());
    }

    
Return whether this group identification number (GID) represents
the primary group to which this user belongs.



Returns:true if this group identification number (GID) represents
         the primary group to which this user belongs,
         or false otherwise.
/**
     * Return whether this group identification number (GID) represents
     * the primary group to which this user belongs.
     *
     * <p>
     *
     * @return true if this group identification number (GID) represents
     *          the primary group to which this user belongs,
     *          or false otherwise.
     */
    public boolean isPrimaryGroup() {
        return primaryGroup;
    }

    
Return a string representation of this
UnixNumericGroupPrincipal.



Returns:a string representation of this
         UnixNumericGroupPrincipal.
/**
     * Return a string representation of this
     * <code>UnixNumericGroupPrincipal</code>.
     *
     * <p>
     *
     * @return a string representation of this
     *          <code>UnixNumericGroupPrincipal</code>.
     */
    public String toString() {

        if (primaryGroup) {
            java.text.MessageFormat form = new java.text.MessageFormat
                (sun.security.util.ResourcesMgr.getString
                        ("UnixNumericGroupPrincipal.Primary.Group.name",
                        "sun.security.util.AuthResources"));
            Object[] source = {name};
            return form.format(source);
        } else {
            java.text.MessageFormat form = new java.text.MessageFormat
                (sun.security.util.ResourcesMgr.getString
                    ("UnixNumericGroupPrincipal.Supplementary.Group.name",
                    "sun.security.util.AuthResources"));
            Object[] source = {name};
            return form.format(source);
        }
    }

    
Compares the specified Object with this
UnixNumericGroupPrincipal
for equality.  Returns true if the given object is also a
UnixNumericGroupPrincipal and the two
UnixNumericGroupPrincipals
have the same group identification number (GID).



Params:
  • o – Object to be compared for equality with this
         UnixNumericGroupPrincipal.
Returns:true if the specified Object is equal equal to this
         UnixNumericGroupPrincipal.
/**
     * Compares the specified Object with this
     * <code>UnixNumericGroupPrincipal</code>
     * for equality.  Returns true if the given object is also a
     * <code>UnixNumericGroupPrincipal</code> and the two
     * UnixNumericGroupPrincipals
     * have the same group identification number (GID).
     *
     * <p>
     *
     * @param o Object to be compared for equality with this
     *          <code>UnixNumericGroupPrincipal</code>.
     *
     * @return true if the specified Object is equal equal to this
     *          <code>UnixNumericGroupPrincipal</code>.
     */
    public boolean equals(Object o) {
        if (o == null)
            return false;

        if (this == o)
            return true;

        if (!(o instanceof UnixNumericGroupPrincipal))
            return false;
        UnixNumericGroupPrincipal that = (UnixNumericGroupPrincipal)o;

        if (this.getName().equals(that.getName()) &&
            this.isPrimaryGroup() == that.isPrimaryGroup())
            return true;
        return false;
    }

    
Return a hash code for this UnixNumericGroupPrincipal.



Returns:a hash code for this UnixNumericGroupPrincipal.
/**
     * Return a hash code for this <code>UnixNumericGroupPrincipal</code>.
     *
     * <p>
     *
     * @return a hash code for this <code>UnixNumericGroupPrincipal</code>.
     */
    public int hashCode() {
        return toString().hashCode();
    }
}