Back to index...

	/*
	* Copyright (c) 2000, 2012, Oracle and/or its affiliates. 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. Oracle designates this
	* particular file as subject to the "Classpath" exception as provided
	* by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
	* or visit www.oracle.com if you need additional information or have any
	* questions.
	*/

	package com.sun.rmi.rmid;

	import java.security.*;
	import java.io.*;
	import java.util.*;

	/**
	* The ExecPermission class represents permission for rmid to execute
	* a specific command to launch an activation group. An ExecPermission
	* consists of a pathname of a command to launch an activation group.
	* <P>
	* Pathname is the pathname of the file or directory to grant rmid
	* execute permission. A pathname that ends in "/*" (where "/" is
	* the file separator character, <code>File.separatorChar</code>) indicates
	* all the files and directories contained in that directory. A pathname
	* that ends with "/-" indicates (recursively) all files
	* and subdirectories contained in that directory. A pathname consisting of
	* the special token "<<ALL FILES>>" matches <bold>any</bold> file.
	* <P>
	* Note: A pathname consisting of a single "*" indicates all the files
	* in the current directory, while a pathname consisting of a single "-"
	* indicates all the files in the current directory and
	* (recursively) all files and subdirectories contained in the current
	* directory.
	* <P>
	*
	*
	* @author Ann Wollrath
	*
	* @serial exclude
	*/
	public final class ExecPermission extends Permission
	{
	/**
	* UID for serialization
	*/
	private static final long serialVersionUID = -6208470287358147919L;

	private transient FilePermission fp;

	/**
	* Creates a new ExecPermission object with the specified path.
	* <i>path</i> is the pathname of a file or directory.
	*
	* <p>A pathname that ends in "/*" (where "/" is
	* the file separator character, <code>File.separatorChar</code>) indicates
	* a directory and all the files contained in that directory. A pathname
	* that ends with "/-" indicates a directory and (recursively) all files
	* and subdirectories contained in that directory. The special pathname
	* "<<ALL FILES>>" matches all files.
	*
	* <p>A pathname consisting of a single "*" indicates all the files
	* in the current directory, while a pathname consisting of a single "-"
	* indicates all the files in the current directory and
	* (recursively) all files and subdirectories contained in the current
	* directory.
	*
	* @param path the pathname of the file/directory.
	*/
	public ExecPermission(String path) {
	super(path);
	init(path);
	}

	/**
	* Creates a new ExecPermission object with the specified path.
	* <i>path</i> is the pathname of a file or directory.
	*
	* <p>A pathname that ends in "/*" (where "/" is
	* the file separator character, <code>File.separatorChar</code>) indicates
	* a directory and all the files contained in that directory. A pathname
	* that ends with "/-" indicates a directory and (recursively) all files
	* and subdirectories contained in that directory. The special pathname
	* "<<ALL FILES>>" matches all files.
	*
	* <p>A pathname consisting of a single "*" indicates all the files
	* in the current directory, while a pathname consisting of a single "-"
	* indicates all the files in the current directory and
	* (recursively) all files and subdirectories contained in the current
	* directory.
	*
	* @param path the pathname of the file/directory.
	* @param actions the action string (unused)
	*/
	public ExecPermission(String path, String actions) {
	this(path);
	}

	/**
	* Checks if this ExecPermission object "implies" the specified permission.
	* <P>
	* More specifically, this method returns true if:<p>
	* <ul>
	* <li> <i>p</i> is an instanceof ExecPermission,<p> and
	* <li> <i>p</i>'s pathname is implied by this object's
	* pathname. For example, "/tmp/*" implies "/tmp/foo", since
	* "/tmp/*" encompasses the "/tmp" directory and all files in that
	* directory, including the one named "foo".
	* </ul>
	* @param p the permission to check against.
	*
	* @return true if the specified permission is implied by this object,
	* false if not.
	*/
	public boolean implies(Permission p) {
	if (!(p instanceof ExecPermission))
	return false;

	ExecPermission that = (ExecPermission) p;

	return fp.implies(that.fp);
	}

	/**
	* Checks two ExecPermission objects for equality.
	* Checks that <i>obj</i>'s class is the same as this object's class
	* and has the same name as this object.
	* <P>
	* @param obj the object we are testing for equality with this object.
	* @return true if <i>obj</i> is an ExecPermission, and has the same
	* pathname as this ExecPermission object, false otherwise.
	*/
	public boolean equals(Object obj) {
	if (obj == this)
	return true;

	if (! (obj instanceof ExecPermission))
	return false;

	ExecPermission that = (ExecPermission) obj;

	return fp.equals(that.fp);
	}

	/**
	* Returns the hash code value for this object.
	*
	* @return a hash code value for this object.
	*/
	public int hashCode() {
	return this.fp.hashCode();
	}

	/**
	* Returns the canonical string representation of the actions.
	*
	* @return the canonical string representation of the actions.
	*/
	public String getActions() {
	return "";
	}

	/**
	* Returns a new PermissionCollection object for storing
	* ExecPermission objects.
	* <p>
	* A ExecPermissionCollection stores a collection of
	* ExecPermission permissions.
	*
	* <p>ExecPermission objects must be stored in a manner that allows
	* them to be inserted in any order, but that also enables the
	* PermissionCollection <code>implies</code> method
	* to be implemented in an efficient (and consistent) manner.
	*
	* @return a new PermissionCollection object suitable for
	* storing ExecPermissions.
	*/
	public PermissionCollection newPermissionCollection() {
	return new ExecPermissionCollection();
	}

	/**
	* readObject is called to restore the state of the ExecPermission
	* from a stream.
	*/
	private synchronized void readObject(java.io.ObjectInputStream s)
	throws IOException, ClassNotFoundException
	{
	s.defaultReadObject();
	// init is called to initialize the rest of the values.
	init(getName());
	}

	/**
	* Initialize a ExecPermission object. Common to all constructors.
	* Also called during de-serialization.
	*/
	private void init(String path) {
	this.fp = new FilePermission(path, "execute");
	}

	/**
	* A ExecPermissionCollection stores a collection
	* of ExecPermission permissions. ExecPermission objects
	* must be stored in a manner that allows them to be inserted in any
	* order, but enable the implies function to evaluate the implies
	* method in an efficient (and consistent) manner.
	*
	* @serial include
	*/
	private static class ExecPermissionCollection
	extends PermissionCollection
	implements java.io.Serializable
	{
	private Vector<Permission> permissions;

	private static final long serialVersionUID = -3352558508888368273L;

	/**
	* Create an empty ExecPermissionCollection.
	*/
	public ExecPermissionCollection() {
	permissions = new Vector<>();
	}

	/**
	* Adds a permission to the collection.
	*
	* @param permission the Permission object to add.
	*
	* @exception IllegalArgumentException - if the permission is not a
	* ExecPermission
	*
	* @exception SecurityException - if this ExecPermissionCollection
	* object has been marked readonly
	*/
	public void add(Permission permission)
	{
	if (! (permission instanceof ExecPermission))
	throw new IllegalArgumentException("invalid permission: "+
	permission);
	if (isReadOnly())
	throw new SecurityException("attempt to add a Permission to a readonly PermissionCollection");

	permissions.addElement(permission);
	}

	/**
	* Check and see if this set of permissions implies the permissions
	* expressed in "permission".
	*
	* @param p the Permission object to compare
	*
	* @return true if "permission" is a proper subset of a permission in
	* the set, false if not.
	*/
	public boolean implies(Permission permission)
	{
	if (! (permission instanceof ExecPermission))
	return false;

	Enumeration<Permission> e = permissions.elements();

	while (e.hasMoreElements()) {
	ExecPermission x = (ExecPermission)e.nextElement();
	if (x.implies(permission)) {
	return true;
	}
	}
	return false;
	}

	/**
	* Returns an enumeration of all the ExecPermission objects in the
	* container.
	*
	* @return an enumeration of all the ExecPermission objects.
	*/
	public Enumeration<Permission> elements()
	{
	return permissions.elements();
	}
	}
	}

Back to index...