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package javax.security.jacc;
import java.security.*;
import java.io.IOException;
import java.io.ObjectStreamField;
/**
* Class for Servlet <i><code>isUserInRole (String reference)</code></i>
* permissions. A WebRoleRefPermission is a named permission and has actions.
* <P>
* The name of an WebRoleRefPermission (also referred to as the target name)
* identifies a Web resource by the servlet name (in the deployment
* descriptor corresponding to the component from which the call to
* <i><code>isUserInRole (String reference)</code></i> is being made.
* <P>
* The actions of an WebRoleRefPermission identifies the role reference to
* which the permission applies. A WebRoleRefPermission is checked to
* determine if the subject is a member of the role identified by the
* reference.
* <P>
* Implementations of this class MAY implement newPermissionCollection or
* inherit its implementation from the super class.
*
* @see java.security.Permission
*
* @author Ron Monzillo
* @author Gary Ellison
*/
public final class WebRoleRefPermission extends Permission
implements java.io.Serializable
{
private final String actions;
private transient int hashCodeValue = 0;
private static final long serialVersionUID = 1L;
/**
* The serialized fields of this permission are defined below. Whether
* or not the serialized fields correspond to actual (private) fields
* is an implementation decision.
* @serialField actions String
* the canonicalized actions string (as returned by getActions).
*/
private static final ObjectStreamField[] serialPersistentFields = {
new ObjectStreamField("actions", java.lang.String.class)
};
/**
* Creates a new WebRoleRefPermission with the specified name and actions.
* <P>
* @param name the servlet-name that identifies the application
* specific web resource in whose context the role references are
* to be evaluated.
* <P>
* @param actions identifies the role reference to which the permission
* pertains. The role reference is scoped to the Web resource identified
* in the name parameter. The value of the role reference must not be
* <code>null</code> or the empty string.
*/
public WebRoleRefPermission(String name, String actions)
{
super(name);
this.actions = actions;
}
/**
* Checks two WebRoleRefPermission objects for equality.
* WebRoleRefPermission objects are equivalent if they have case
* equivalent name and actions values.
* <P>
* Two Permission objects, P1 and P2, are equivalent if and only if
* P1.implies(P2) && P2.implies(P1).
* <P>
* The name and actions comparisons described above are case sensitive.
* <P>
* @param o the WebRoleRefPermission object being tested for equality
* with this WebRoleRefPermission.
* @return true if the argument WebRoleRefPermission object is equivalent
* to this WebRoleRefPermission.
*/
public boolean equals(Object o)
{
if (o == null ||
! (o instanceof WebRoleRefPermission)) return false;
WebRoleRefPermission that = (WebRoleRefPermission) o;
if (!this.getName().equals(that.getName())) return false;
return this.actions.equals(that.actions);
}
/**
* Returns a canonical String representation of the actions of this
* WebRoleRefPermission.
* <P>
* @return a String containing the canonicalized actions of this
* WebRoleRefPermission.
*/
public String getActions()
{
return this.actions;
}
/**
* Returns the hash code value for this WebRoleRefPermission. The
* properties of the returned hash code must be as follows: <p>
* <ul>
* <li> During the lifetime of a Java application, the hashCode method
* must return the same integer value, every time it is called on a
* WebRoleRefPermission object. The value returned by hashCode for a
* particular WebRoleRefPermission need not remain consistent from
* one execution of an application to another.
* <li> If two WebRoleRefPermission objects are equal according to the
* equals method, then calling the hashCode method on each of the two
* Permission objects must produce the same integer result (within an
* application).
* </ul>
* <P>
* @return the integer hash code value for this object.
*/
public int hashCode()
{
if (this.hashCodeValue == 0) {
String hashInput = new String(this.getName() + " " + this.actions);
this.hashCodeValue = hashInput.hashCode();
}
return this.hashCodeValue;
}
/**
* Determines if the argument Permission is "implied by" this
* WebRoleRefPermission. For this to be the case, <p>
* <ul>
* <li> The argument must be an instanceof WebRoleRefPermission
* <li> with name equivalent to this WebRoleRefPermission, and
* <li> with role reference equivalent to this WebRoleRefPermission
* (as defined in their actions).
* </ul>
* <P>
* The comparisons described above are case sensitive.
* <P>
* @param permission "this" WebRoleRefPermission is checked to see if
* it implies the argument permission.
* <P>
* @return true if the specified permission is implied by this object,
* false if not.
*/
public boolean implies(Permission permission)
{
return this.equals(permission);
}
// ----------------- Private Methods ---------------------
/**
* readObject reads the serialized fields from the
* input stream and uses them to restore the permission.
* This method need not be implemented if establishing the
* values of the serialized fields (as is done by defaultReadObject)
* is sufficient to initialize the permission.
*/
private synchronized void readObject(java.io.ObjectInputStream s)
throws IOException,ClassNotFoundException
{
s.defaultReadObject();
}
/**
* writeObject is used to establish the values of the serialized fields
* before they are written to the output stream and need not be
* implemented if the values of the serialized fields are always
* available and up to date. The serialized fields are written to
* the output stream in the same form as they would be written
* by defaultWriteObject.
*/
private synchronized void writeObject(java.io.ObjectOutputStream s)
throws IOException
{
s.defaultWriteObject();
}
}
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