Examples of java.security.acl.AclEntry

java.security.acl.AclEntry
This is the interface used for representing one entry in an Access Control List (ACL).
An ACL can be thought of as a data structure with multiple ACL entry objects. Each ACL entry object contains a set of permissions associated with a particular principal. (A principal represents an entity such as an individual user or a group). Additionally, each ACL entry is specified as being either positive or negative. If positive, the permissions are to be granted to the associated principal. If negative, the permissions are to be denied. Each principal can have at most one positive ACL entry and one negative entry; that is, multiple positive or negative ACL entries are not allowed for any principal. Note: ACL entries are by default positive. An entry becomes a negative entry only if the {@link #setNegativePermissions() setNegativePermissions}method is called on it. @see java.security.acl.Acl @author Satish Dharmaraj


        // PrincipalImpl() take the current host as entry
        owner = new PrincipalImpl();
        try {
            acl = new AclImpl(owner,Owner);
            AclEntry ownEntry = new AclEntryImpl(owner);
            ownEntry.addPermission(READ);
            ownEntry.addPermission(WRITE);
            acl.addEntry(owner,ownEntry);
        } catch (NotOwnerException ex) {
            if (SNMP_LOGGER.isLoggable(Level.FINEST)) {
                SNMP_LOGGER.logp(Level.FINEST, SnmpAcl.class.getName(),
                    "SnmpAcl(String,String)",

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    public void rereadTheFile() throws NotOwnerException, UnknownHostException {
        alwaysAuthorized = false;
        acl.removeAll(owner);
        trapDestList.clear();
        informDestList.clear();
        AclEntry ownEntry = new AclEntryImpl(owner);
        ownEntry.addPermission(READ);
        ownEntry.addPermission(WRITE);
        acl.addEntry(owner,ownEntry);
        readAuthorizedListFile();
    }

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   */
  @Override
  public boolean checkPermission(Principal user,
                                 java.security.acl.Permission perm) {
        for (Enumeration<AclEntry> e = entryList.elements();e.hasMoreElements();){
          AclEntry ent = e.nextElement();
          if (ent.getPrincipal().equals(user))
                if (ent.checkPermission(perm)) return true;
        }
        return false;
  }

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   * @see java.security.Principal
   */
  public Enumeration getPermissions(Principal user){
  Vector empty = new Vector();
  for (Enumeration e = entryList.elements();e.hasMoreElements();){
    AclEntry ent = (AclEntry) e.nextElement();
    if (ent.getPrincipal().equals(user))
    return ent.permissions();
  }
  return empty.elements();
  }

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   * @see java.security.Permission
   */
  public boolean checkPermission(Principal user, 
         java.security.acl.Permission perm) {
  for (Enumeration e = entryList.elements();e.hasMoreElements();){
    AclEntry ent = (AclEntry) e.nextElement();
    if (ent.getPrincipal().equals(user))
    if (ent.checkPermission(perm)) return true;
  }
  return false;
  }

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        // PrincipalImpl() take the current host as entry
        owner = new PrincipalImpl();
        try {
            acl = new AclImpl(owner,Owner);
            AclEntry ownEntry = new AclEntryImpl(owner);
            ownEntry.addPermission(READ);
            ownEntry.addPermission(WRITE);
            acl.addEntry(owner,ownEntry);
        } catch (NotOwnerException ex) {
            if (isDebugOn()) {
                debug("constructor", 
          "Should never get NotOwnerException as the owner"+

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    public void rereadTheFile() throws NotOwnerException, UnknownHostException {
        alwaysAuthorized = false;
        acl.removeAll(owner);
        trapDestList.clear();
        informDestList.clear();
        AclEntry ownEntry = new AclEntryImpl(owner);
        ownEntry.addPermission(READ);
        ownEntry.addPermission(WRITE);  
        acl.addEntry(owner,ownEntry);
        readAuthorizedListFile();
    }

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   * @see java.security.Principal
   */
  public Enumeration<Permission> getPermissions(Principal user){
        Vector<Permission> empty = new Vector<Permission>();
        for (Enumeration<AclEntry> e = entryList.elements();e.hasMoreElements();){
          AclEntry ent = e.nextElement();
          if (ent.getPrincipal().equals(user))
                return ent.permissions();
        }
        return empty.elements();
  }

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   * @see java.security.Permission
   */
  public boolean checkPermission(Principal user,
                                 java.security.acl.Permission perm) {
        for (Enumeration e = entryList.elements();e.hasMoreElements();){
          AclEntry ent = (AclEntry) e.nextElement();
          if (ent.getPrincipal().equals(user))
                if (ent.checkPermission(perm)) return true;
        }
        return false;
  }

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        // PrincipalImpl() take the current host as entry
        owner = new PrincipalImpl();
        try {
            acl = new AclImpl(owner,Owner);
            AclEntry ownEntry = new AclEntryImpl(owner);
            ownEntry.addPermission(READ);
            ownEntry.addPermission(WRITE);
            acl.addEntry(owner,ownEntry);
        } catch (NotOwnerException ex) {
            if (SNMP_LOGGER.isLoggable(Level.FINEST)) {
                SNMP_LOGGER.logp(Level.FINEST, SnmpAcl.class.getName(),
                    "SnmpAcl(String,String)",

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