/* BasicPermission.java -- Implements a simple named permission. Copyright (C) 1998, 1999 Free Software Foundation, Inc. This file is part of GNU Classpath. GNU Classpath is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later version. GNU Classpath 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 General Public License for more details. You should have received a copy of the GNU General Public License along with GNU Classpath; see the file COPYING. If not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. As a special exception, if you link this library with other files to produce an executable, this library does not by itself cause the resulting executable to be covered by the GNU General Public License. This exception does not however invalidate any other reasons why the executable file might be covered by the GNU General Public License. */ package java.security; import java.io.Serializable; import java.util.Hashtable; import java.util.Enumeration; /** * This class implements a simple model for named permissions without an * associated action list. That is, either the named permission is granted * or it is not. *

* It also supports trailing wildcards to allow the * easy granting of permissions in a hierarchical fashion. (For example, * the name "org.gnu.*" might grant all permissions under the "org.gnu" * permissions hierarchy). The only valid wildcard character is a '*' * which matches anything. It must be the rightmost element in the * permission name and must follow a '.' or else the Permission name must * consist of only a '*'. Any other occurrence of a '*' is not valid. *

* This class ignores the action list. Subclasses can choose to implement * actions on top of this class if desired. * * @version 0.1 * * @author Aaron M. Renn (arenn@urbanophile.com) */ public abstract class BasicPermission extends Permission implements Serializable { /** * This method initializes a new instance of BasicPermission * with the specified name. If the name contains an illegal wildcard * character, an exception is thrown. * * @param name The name of this permission. * * @exception IllegalArgumentException If the name contains an invalid wildcard character * @exception NullPointerException If the name is null */ public BasicPermission(String name) throws IllegalArgumentException, NullPointerException { super(name); if (name.indexOf("*") != -1) { if (!name.endsWith(".*") && !name.equals("*")) throw new IllegalArgumentException("Bad wildcard: " + name); if (name.indexOf("*") != name.lastIndexOf("*")) throw new IllegalArgumentException("Bad wildcard: " + name); } } /** * This method initializes a new instance of BasicPermission * with the specified name. If the name contains an illegal wildcard * character, an exception is thrown. The action list passed to this * form of the constructor is ignored. * * @param name The name of this permission. * @param actions The list of actions for this permission - ignored in this class. * * @exception IllegalArgumentException If the name contains an invalid wildcard character * @exception NullPointerException If the name is null */ public BasicPermission(String name, String actions) throws IllegalArgumentException, NullPointerException { // ignore actions this(name); } /** * This method tests to see if the specified permission is implied by * this permission. This will be true if the following conditions are met: *

*

* * @param perm The Permission object to test against. * * @return true if the specified permission is implied by this one or false otherwise. */ public boolean implies(Permission perm) { if (!(perm instanceof BasicPermission)) return false; String otherName = perm.getName(); String name = getName(); if (name.equals(otherName)) return true; int last = name.length() - 1; if (name.charAt(last) == '*' && otherName.startsWith(name.substring(0, last))) return true; return false; } /** * This method tests to see if this object is equal to the specified * Object. This will be true if and only if the specified * object meets the following conditions: *

*

* * @param obj The Object to test for equality against this object * * @return true if the specified Object is equal to this object or false otherwise. */ public boolean equals(Object obj) { if (!(obj instanceof BasicPermission)) return (false); if (!getName().equals(((BasicPermission) obj).getName())) return (false); return (true); } /** * This method returns a hash code for this permission object. The hash * code returned is the value returned by calling the hashCode * method on the String that is the name of this permission. * * @return A hash value for this object */ public int hashCode() { return (getName().hashCode()); } /** * This method returns a list of the actions associated with this * permission. This method always returns the empty string ("") since * this class ignores actions. * * @return The action list. */ public String getActions() { return (""); } /** * This method returns an instance of PermissionCollection * suitable for storing BasicPermission objects. This returns * be a sub class of PermissionCollection * that allows for an efficient and consistent implementation of * the implies method. The collection doesn't handle subclasses * of BasicPermission correctly; they must override this method. * * @return A new empty PermissionCollection object. */ public PermissionCollection newPermissionCollection() { return new PermissionCollection() { Hashtable permissions = new Hashtable(); boolean allAllowed = false; public void add(Permission permission) { if (isReadOnly()) throw new IllegalStateException("readonly"); BasicPermission bp = (BasicPermission) permission; String name = bp.getName(); if (name.equals("*")) allAllowed = true; permissions.put(name, bp); } public boolean implies(Permission permission) { if (!(permission instanceof BasicPermission)) return false; if (allAllowed) return true; BasicPermission toImply = (BasicPermission) permission; String name = toImply.getName(); if (name.equals("*")) return false; int prefixLength = name.length(); if (name.endsWith("*")) prefixLength -= 2; while (true) { if (permissions.get(name) != null) return true; prefixLength = name.lastIndexOf('.', prefixLength); if (prefixLength < 0) return false; name = name.substring(0, prefixLength + 1) + '*'; } } public Enumeration elements() { return permissions.elements(); } }; } }