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package com.sun.rmi.rmid;

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

The ExecOptionPermission class represents permission for rmid to use a specific command-line option when launching an activation group.
Author:Ann Wollrath
@serialexclude
/** * The ExecOptionPermission class represents permission for rmid to use * a specific command-line option when launching an activation group. * * @author Ann Wollrath * * @serial exclude */
public final class ExecOptionPermission extends Permission {
does this permission have a wildcard at the end?
/** * does this permission have a wildcard at the end? */
private transient boolean wildcard;
the name without the wildcard on the end
/** * the name without the wildcard on the end */
private transient String name;
UID for serialization
/** * UID for serialization */
private static final long serialVersionUID = 5842294756823092756L; public ExecOptionPermission(String name) { super(name); init(name); } public ExecOptionPermission(String name, String actions) { this(name); }
Checks if the specified permission is "implied" by this object.

More specifically, this method returns true if:

  • p's class is the same as this object's class, and
  • p's name equals or (in the case of wildcards) is implied by this object's name. For example, "a.b.*" implies "a.b.c", and "a.b=*" implies "a.b=c"
Params:
  • p – the permission to check against.
Returns:true if the passed permission is equal to or implied by this permission, false otherwise.
/** * Checks if the specified permission is "implied" by * this object. * <P> * More specifically, this method returns true if: * <ul> * <li> <i>p</i>'s class is the same as this object's class, and * <li> <i>p</i>'s name equals or (in the case of wildcards) * is implied by this object's * name. For example, "a.b.*" implies "a.b.c", and * "a.b=*" implies "a.b=c" * </ul> * * @param p the permission to check against. * * @return true if the passed permission is equal to or * implied by this permission, false otherwise. */
public boolean implies(Permission p) { if (!(p instanceof ExecOptionPermission)) return false; ExecOptionPermission that = (ExecOptionPermission) p; if (this.wildcard) { if (that.wildcard) { // one wildcard can imply another return that.name.startsWith(name); } else { // make sure p.name is longer so a.b.* doesn't imply a.b return (that.name.length() > this.name.length()) && that.name.startsWith(this.name); } } else { if (that.wildcard) { // a non-wildcard can't imply a wildcard return false; } else { return this.name.equals(that.name); } } }
Checks two ExecOptionPermission objects for equality. Checks that obj's class is the same as this object's class and has the same name as this object.
Params:
  • obj – the object we are testing for equality with this object.
Returns:true if obj is an ExecOptionPermission, and has the same name as this ExecOptionPermission object, false otherwise.
/** * Checks two ExecOptionPermission 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. * * @param obj the object we are testing for equality with this object. * @return true if <i>obj</i> is an ExecOptionPermission, and has the same * name as this ExecOptionPermission object, false otherwise. */
public boolean equals(Object obj) { if (obj == this) return true; if ((obj == null) || (obj.getClass() != getClass())) return false; ExecOptionPermission that = (ExecOptionPermission) obj; return this.getName().equals(that.getName()); }
Returns the hash code value for this object. The hash code used is the hash code of the name, that is, getName().hashCode(), where getName is from the Permission superclass.
Returns:a hash code value for this object.
/** * Returns the hash code value for this object. * The hash code used is the hash code of the name, that is, * <code>getName().hashCode()</code>, where <code>getName</code> is * from the Permission superclass. * * @return a hash code value for this object. */
public int hashCode() { return this.getName().hashCode(); }
Returns the canonical string representation of the actions.
Returns:the canonical string representation of the actions.
/** * 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 ExecOptionPermission objects.

An ExecOptionPermissionCollection stores a collection of ExecOptionPermission permissions.

ExecOptionPermission objects must be stored in a manner that allows them to be inserted in any order, but that also enables the PermissionCollection implies method to be implemented in an efficient (and consistent) manner.

Returns:a new PermissionCollection object suitable for storing ExecOptionPermissions.
/** * Returns a new PermissionCollection object for storing * ExecOptionPermission objects. * <p> * An ExecOptionPermissionCollection stores a collection of * ExecOptionPermission permissions. * * <p>ExecOptionPermission 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 ExecOptionPermissions. */
public PermissionCollection newPermissionCollection() { return new ExecOptionPermissionCollection(); }
readObject is called to restore the state of the ExecOptionPermission from a stream.
/** * readObject is called to restore the state of the ExecOptionPermission * 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 ExecOptionPermission object. Common to all constructors. Also called during de-serialization.
/** * Initialize a ExecOptionPermission object. Common to all constructors. * Also called during de-serialization. */
private void init(String name) { if (name == null) throw new NullPointerException("name can't be null"); if (name.equals("")) { throw new IllegalArgumentException("name can't be empty"); } if (name.endsWith(".*") || name.endsWith("=*") || name.equals("*")) { wildcard = true; if (name.length() == 1) { this.name = ""; } else { this.name = name.substring(0, name.length()-1); } } else { this.name = name; } }
A ExecOptionPermissionCollection stores a collection of ExecOptionPermission permissions. ExecOptionPermission 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. A ExecOptionPermissionCollection handles comparing a permission like "a.b.c.d.e" * with a Permission such as "a.b.*", or "*".
@serialinclude
/** * A ExecOptionPermissionCollection stores a collection * of ExecOptionPermission permissions. ExecOptionPermission 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. * * A ExecOptionPermissionCollection handles comparing a permission like * "a.b.c.d.e" * with a Permission such as "a.b.*", or "*". * * @serial include */
private static class ExecOptionPermissionCollection extends PermissionCollection implements java.io.Serializable { private Hashtable<String, Permission> permissions; private boolean all_allowed; // true if "*" is in the collection private static final long serialVersionUID = -1242475729790124375L;
Create an empty ExecOptionPermissionCollection.
/** * Create an empty ExecOptionPermissionCollection. */
public ExecOptionPermissionCollection() { permissions = new Hashtable<>(11); all_allowed = false; }
Adds a permission to the collection. The key for the hash is permission.name.
Params:
  • permission – the Permission object to add.
Throws:
/** * Adds a permission to the collection. The key for the hash is * permission.name. * * @param permission the Permission object to add. * * @exception IllegalArgumentException - if the permission is not a * ExecOptionPermission * * @exception SecurityException - if this ExecOptionPermissionCollection * object has been marked readonly */
public void add(Permission permission) { if (! (permission instanceof ExecOptionPermission)) throw new IllegalArgumentException("invalid permission: "+ permission); if (isReadOnly()) throw new SecurityException("attempt to add a Permission to a readonly PermissionCollection"); ExecOptionPermission p = (ExecOptionPermission) permission; permissions.put(p.getName(), permission); if (!all_allowed) { if (p.getName().equals("*")) all_allowed = true; } }
Check and see if this set of permissions implies the permissions expressed in "permission".
Params:
  • p – the Permission object to compare
Returns:true if "permission" is a proper subset of a permission in the set, false if not.
/** * 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 ExecOptionPermission)) return false; ExecOptionPermission p = (ExecOptionPermission) permission; // short circuit if the "*" Permission was added if (all_allowed) return true; // strategy: // Check for full match first. Then work our way up the // name looking for matches on a.b.* String pname = p.getName(); Permission x = permissions.get(pname); if (x != null) // we have a direct hit! return x.implies(permission); // work our way up the tree... int last, offset; offset = pname.length() - 1; while ((last = pname.lastIndexOf('.', offset)) != -1) { pname = pname.substring(0, last+1) + "*"; x = permissions.get(pname); if (x != null) { return x.implies(permission); } offset = last - 1; } // check for "=*" wildcard match pname = p.getName(); offset = pname.length() - 1; while ((last = pname.lastIndexOf('=', offset)) != -1) { pname = pname.substring(0, last+1) + "*"; x = permissions.get(pname); if (x != null) { return x.implies(permission); } offset = last - 1; } // we don't have to check for "*" as it was already checked // at the top (all_allowed), so we just return false return false; }
Returns an enumeration of all the ExecOptionPermission objects in the container.
Returns:an enumeration of all the ExecOptionPermission objects.
/** * Returns an enumeration of all the ExecOptionPermission objects in the * container. * * @return an enumeration of all the ExecOptionPermission objects. */
public Enumeration<Permission> elements() { return permissions.elements(); } } }