net.jini.constraint
Class BasicMethodConstraints

java.lang.Object
  net.jini.constraint.BasicMethodConstraints

All Implemented Interfaces:

Serializable, MethodConstraints

public final class BasicMethodConstraints
extends Object
implements MethodConstraints, Serializable

Basic implementation of MethodConstraints, allowing limited wildcard matching on method names and parameter types. Methods can be specified by exact name and parameter types (matching a single method), by exact name (matching all methods with that name), by name prefix (matching all methods with names that start with that prefix), by name suffix (matching all methods with names that end with that suffix), and by a default that matches all methods. Normally instances of this class should be obtained from a Configuration rather than being explicitly constructed.

Since:

2.0

Author:

Sun Microsystems, Inc.

See Also:

Serialized Form

Nested Class Summary

static class

BasicMethodConstraints.MethodDesc Descriptor for specifying the constraints associated with one or more methods allowing limited wildcard matching on method names and parameter types.

Constructor Summary

BasicMethodConstraints(BasicMethodConstraints.MethodDesc[] descs)
Creates an instance with the specified ordered array of descriptors.

BasicMethodConstraints(InvocationConstraints constraints)
Creates an instance that maps all methods to the specified constraints.

Method Summary

boolean	equals(Object obj) Two instances of this class are equal if they have the same descriptors in the same order.
InvocationConstraints	getConstraints(Method method) Returns the constraints for the specified remote method as a non-null value.
BasicMethodConstraints.MethodDesc[]	getMethodDescs() Returns the descriptors.
int	hashCode() Returns a hash code value for this object.
Iterator	possibleConstraints() Returns an iterator that yields all of the possible distinct constraints that can be returned by getConstraints, in arbitrary order and with duplicates permitted.
String	toString() Returns a string representation of this object.

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

BasicMethodConstraints

public BasicMethodConstraints(BasicMethodConstraints.MethodDesc[] descs)

Creates an instance with the specified ordered array of descriptors. The getConstraints method searches the descriptors in the specified order. For any given descriptor in the array, no preceding descriptor can match at least the same methods as the given descriptor; that is, more specific descriptors must precede less specific descriptors. The array passed to the constructor is neither modified nor retained; subsequent changes to that array have no effect on the instance created.

Parameters:

descs - the descriptors

Throws:

NullPointerException - if the argument is null or any element of the argument is null

IllegalArgumentException - if the descriptors array is empty, or if any descriptor is preceded by another descriptor that matches at least the same methods

BasicMethodConstraints

public BasicMethodConstraints(InvocationConstraints constraints)

Creates an instance that maps all methods to the specified constraints. The constraints can be null, which is treated the same as an empty instance. Calling this constructor is equivalent to constructing an instance of this class with an array containing a single default descriptor constructed with the specified constraints.

Parameters:

constraints - the constraints, or null

Method Detail

getConstraints

public InvocationConstraints getConstraints(Method method)

Returns the constraints for the specified remote method as a non-null value. Searches the descriptors in order, and returns the constraints in the first descriptor that matches the method, or an empty constraints instance if there is no match.

Specified by:

getConstraints in interface MethodConstraints

Parameters:

method - the method

Returns:

the constraints for the specified method as a non-null value

Throws:

NullPointerException - if the argument is null

possibleConstraints

public Iterator possibleConstraints()

Description copied from interface: MethodConstraints

Returns an iterator that yields all of the possible distinct constraints that can be returned by getConstraints, in arbitrary order and with duplicates permitted. The iterator throws an UnsupportedOperationException on any attempt to remove an element.

Specified by:

possibleConstraints in interface MethodConstraints

Returns:

an iterator that yields all of the possible distinct constraints that can be returned by getConstraints, in arbitrary order and with duplicates permitted

getMethodDescs

public BasicMethodConstraints.MethodDesc[] getMethodDescs()

Returns the descriptors. Returns a new non-null array every time it is called.

Returns:

the descriptors as a new non-null array

hashCode

public int hashCode()

Returns a hash code value for this object.

Overrides:

hashCode in class Object

toString

public String toString()

Returns a string representation of this object.

Overrides:

toString in class Object

equals

public boolean equals(Object obj)

Two instances of this class are equal if they have the same descriptors in the same order.

Overrides:

equals in class Object