From 51acace4cce1255942e3e3bd3a7ecbff7f5b9377 Mon Sep 17 00:00:00 2001 From: tromey Date: Fri, 19 May 2000 17:55:34 +0000 Subject: Jumbo patch: * Imported beans and serialization * Updated IA-64 port * Miscellaneous bug fixes git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@34028 138bc75d-0d04-0410-961f-82ee72b054a4 --- libjava/java/security/BasicPermission.java | 271 +++++++++++++++++++++++++++++ 1 file changed, 271 insertions(+) create mode 100644 libjava/java/security/BasicPermission.java (limited to 'libjava/java/security/BasicPermission.java') diff --git a/libjava/java/security/BasicPermission.java b/libjava/java/security/BasicPermission.java new file mode 100644 index 00000000000..f2e70ed3738 --- /dev/null +++ b/libjava/java/security/BasicPermission.java @@ -0,0 +1,271 @@ +/* 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 +{ + + /*************************************************************************/ + + /* + * Constructors + */ + + /** + * 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(); + } + }; + } +} // class BasicPermission -- cgit v1.2.3