java.io: final class: FilePermissionCollection

java.io
final class: FilePermissionCollection [javadoc | source]

java.lang.Object
   java.security.PermissionCollection
      java.io.FilePermissionCollection

All Implemented Interfaces:
Serializable

Collects FilePermission objects and allows to query whether a particular permission is implied by it.

Field Summary
Vector<Permission>	permissions

Constructor:
public FilePermissionCollection() { super(); } Construct a new FilePermissionCollection

Constructor:

 public FilePermissionCollection() {
        super();
}

Construct a new FilePermissionCollection

Method from java.io.FilePermissionCollection Summary:
add, elements, implies

Methods from java.security.PermissionCollection:
add, elements, implies, isReadOnly, setReadOnly, toString

Methods from java.lang.Object:
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method from java.io.FilePermissionCollection Detail:
public void add(Permission permission) { if (isReadOnly()) { throw new IllegalStateException(); } if (permission instanceof FilePermission) { permissions.addElement(permission); } else { throw new IllegalArgumentException(permission.toString()); } } Add a permission object to the permission collection.
public Enumeration<Permission> elements() { return permissions.elements(); } Returns an enumeration for the collection of permissions.
public boolean implies(Permission permission) { if (permission instanceof FilePermission) { FilePermission fp = (FilePermission) permission; int matchedMask = 0; int i = 0; while (i < permissions.size() && ((matchedMask & fp.mask) != fp.mask)) { // Cast will not fail since we added it matchedMask \|= ((FilePermission) permissions.elementAt(i)) .impliesMask(permission); i++; } return ((matchedMask & fp.mask) == fp.mask); } return false; } Indicates whether this permissions collection implies a specific {@code permission}.

Method from java.io.FilePermissionCollection Detail:

 public  void add(Permission permission) {
        if (isReadOnly()) {
            throw new IllegalStateException();
        }
        if (permission instanceof FilePermission) {
            permissions.addElement(permission);
        } else {
            throw new IllegalArgumentException(permission.toString());
        }
}

Add a permission object to the permission collection.

 public Enumeration<Permission> elements() {
        return permissions.elements();
}

Returns an enumeration for the collection of permissions.

 public boolean implies(Permission permission) {
        if (permission instanceof FilePermission) {
            FilePermission fp = (FilePermission) permission;
            int matchedMask = 0;
            int i = 0;
            while (i <  permissions.size()
                    && ((matchedMask & fp.mask) != fp.mask)) {
                // Cast will not fail since we added it
                matchedMask |= ((FilePermission) permissions.elementAt(i))
                        .impliesMask(permission);
                i++;
            }
            return ((matchedMask & fp.mask) == fp.mask);
        }
        return false;
}

Indicates whether this permissions collection implies a specific {@code permission}.