--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/src/share/classes/java/security/Permission.java Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,231 @@
+/*
+ * Copyright 1997-2003 Sun Microsystems, Inc. All Rights Reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation. Sun designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Sun in the LICENSE file that accompanied this code.
+ *
+ * This code 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
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ */
+
+package java.security;
+
+/**
+ * Abstract class for representing access to a system resource.
+ * All permissions have a name (whose interpretation depends on the subclass),
+ * as well as abstract functions for defining the semantics of the
+ * particular Permission subclass.
+ *
+ * <p>Most Permission objects also include an "actions" list that tells the actions
+ * that are permitted for the object. For example,
+ * for a <code>java.io.FilePermission</code> object, the permission name is
+ * the pathname of a file (or directory), and the actions list
+ * (such as "read, write") specifies which actions are granted for the
+ * specified file (or for files in the specified directory).
+ * The actions list is optional for Permission objects, such as
+ * <code>java.lang.RuntimePermission</code>,
+ * that don't need such a list; you either have the named permission (such
+ * as "system.exit") or you don't.
+ *
+ * <p>An important method that must be implemented by each subclass is
+ * the <code>implies</code> method to compare Permissions. Basically,
+ * "permission p1 implies permission p2" means that
+ * if one is granted permission p1, one is naturally granted permission p2.
+ * Thus, this is not an equality test, but rather more of a
+ * subset test.
+ *
+ * <P> Permission objects are similar to String objects in that they
+ * are immutable once they have been created. Subclasses should not
+ * provide methods that can change the state of a permission
+ * once it has been created.
+ *
+ * @see Permissions
+ * @see PermissionCollection
+ *
+ *
+ * @author Marianne Mueller
+ * @author Roland Schemers
+ */
+
+public abstract class Permission implements Guard, java.io.Serializable {
+
+ private static final long serialVersionUID = -5636570222231596674L;
+
+ private String name;
+
+ /**
+ * Constructs a permission with the specified name.
+ *
+ * @param name name of the Permission object being created.
+ *
+ */
+
+ public Permission(String name) {
+ this.name = name;
+ }
+
+ /**
+ * Implements the guard interface for a permission. The
+ * <code>SecurityManager.checkPermission</code> method is called,
+ * passing this permission object as the permission to check.
+ * Returns silently if access is granted. Otherwise, throws
+ * a SecurityException.
+ *
+ * @param object the object being guarded (currently ignored).
+ *
+ * @throws SecurityException
+ * if a security manager exists and its
+ * <code>checkPermission</code> method doesn't allow access.
+ *
+ * @see Guard
+ * @see GuardedObject
+ * @see SecurityManager#checkPermission
+ *
+ */
+ public void checkGuard(Object object) throws SecurityException {
+ SecurityManager sm = System.getSecurityManager();
+ if (sm != null) sm.checkPermission(this);
+ }
+
+ /**
+ * Checks if the specified permission's actions are "implied by"
+ * this object's actions.
+ * <P>
+ * This must be implemented by subclasses of Permission, as they are the
+ * only ones that can impose semantics on a Permission object.
+ *
+ * <p>The <code>implies</code> method is used by the AccessController to determine
+ * whether or not a requested permission is implied by another permission that
+ * is known to be valid in the current execution context.
+ *
+ * @param permission the permission to check against.
+ *
+ * @return true if the specified permission is implied by this object,
+ * false if not.
+ */
+
+ public abstract boolean implies(Permission permission);
+
+ /**
+ * Checks two Permission objects for equality.
+ * <P>
+ * Do not use the <code>equals</code> method for making access control
+ * decisions; use the <code>implies</code> method.
+ *
+ * @param obj the object we are testing for equality with this object.
+ *
+ * @return true if both Permission objects are equivalent.
+ */
+
+ public abstract boolean equals(Object obj);
+
+ /**
+ * Returns the hash code value for this Permission object.
+ * <P>
+ * The required <code>hashCode</code> behavior for Permission Objects is
+ * the following: <p>
+ * <ul>
+ * <li>Whenever it is invoked on the same Permission object more than
+ * once during an execution of a Java application, the
+ * <code>hashCode</code> method
+ * must consistently return the same integer. This integer need not
+ * remain consistent from one execution of an application to another
+ * execution of the same application. <p>
+ * <li>If two Permission objects are equal according to the
+ * <code>equals</code>
+ * method, then calling the <code>hashCode</code> method on each of the
+ * two Permission objects must produce the same integer result.
+ * </ul>
+ *
+ * @return a hash code value for this object.
+ */
+
+ public abstract int hashCode();
+
+ /**
+ * Returns the name of this Permission.
+ * For example, in the case of a <code>java.io.FilePermission</code>,
+ * the name will be a pathname.
+ *
+ * @return the name of this Permission.
+ *
+ */
+
+ public final String getName() {
+ return name;
+ }
+
+ /**
+ * Returns the actions as a String. This is abstract
+ * so subclasses can defer creating a String representation until
+ * one is needed. Subclasses should always return actions in what they
+ * consider to be their
+ * canonical form. For example, two FilePermission objects created via
+ * the following:
+ *
+ * <pre>
+ * perm1 = new FilePermission(p1,"read,write");
+ * perm2 = new FilePermission(p2,"write,read");
+ * </pre>
+ *
+ * both return
+ * "read,write" when the <code>getActions</code> method is invoked.
+ *
+ * @return the actions of this Permission.
+ *
+ */
+
+ public abstract String getActions();
+
+ /**
+ * Returns an empty PermissionCollection for a given Permission object, or null if
+ * one is not defined. Subclasses of class Permission should
+ * override this if they need to store their permissions in a particular
+ * PermissionCollection object in order to provide the correct semantics
+ * when the <code>PermissionCollection.implies</code> method is called.
+ * If null is returned,
+ * then the caller of this method is free to store permissions of this
+ * type in any PermissionCollection they choose (one that uses a Hashtable,
+ * one that uses a Vector, etc).
+ *
+ * @return a new PermissionCollection object for this type of Permission, or
+ * null if one is not defined.
+ */
+
+ public PermissionCollection newPermissionCollection() {
+ return null;
+ }
+
+ /**
+ * Returns a string describing this Permission. The convention is to
+ * specify the class name, the permission name, and the actions in
+ * the following format: '("ClassName" "name" "actions")'.
+ *
+ * @return information about this Permission.
+ */
+
+ public String toString() {
+ String actions = getActions();
+ if ((actions == null) || (actions.length() == 0)) { // OPTIONAL
+ return "(" + getClass().getName() + " " + name + ")";
+ } else {
+ return "(" + getClass().getName() + " " + name + " " +
+ actions + ")";
+ }
+ }
+}