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/*
* Copyright (c) OSGi Alliance (2011, 2012). All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.osgi.framework.resource;
import java.util.List;
/**
* A wiring for a resource. A wiring is associated with a resource and
* represents the dependencies with other wirings.
*
* <p>
* Instances of this type must be <i>effectively immutable</i>. That is, for a
* given instance of this interface, the methods defined by this interface must
* always return the same result.
*
* @ThreadSafe
* @version $Id: ac9bdc86f3ece3efd2aad9068b3bb09bf456dfbf $
*/
public interface Wiring {
/**
* Returns the capabilities provided by this wiring.
*
* <p>
* Only capabilities considered by the resolver are returned. For example,
* capabilities with
* {@link ResourceConstants#CAPABILITY_EFFECTIVE_DIRECTIVE effective}
* directive not equal to {@link ResourceConstants#EFFECTIVE_RESOLVE
* resolve} are not returned.
*
* <p>
* A capability may not be required by any wiring and thus there may be no
* {@link #getProvidedResourceWires(String) wires} for the capability.
*
* <p>
* A wiring for a non-fragment resource provides a subset of the declared
* capabilities from the resource and all attached fragment
* resources<sup>†</sup>. Not all declared capabilities may be
* provided since some may be discarded. For example, if a package is
* declared to be both exported and imported, only one is selected and the
* other is discarded.
* <p>
* A wiring for a fragment resource with a symbolic name must provide
* exactly one {@link ResourceConstants#IDENTITY_NAMESPACE identity}
* capability.
* <p>
* † The {@link ResourceConstants#IDENTITY_NAMESPACE identity}
* capability provided by attached fragment resource must not be included in
* the capabilities of the host wiring.
*
* @param namespace The name space of the capabilities to return or
* {@code null} to return the capabilities from all name spaces.
* @return A list containing a snapshot of the {@link Capability}s, or an
* empty list if this wiring provides no capabilities in the
* specified name space. For a given name space, the list contains
* the wires in the order the capabilities were specified in the
* manifests of the {@link #getResource() resource} and the attached
* fragment resources<sup>†</sup> of this wiring. There is no
* ordering defined between capabilities in different name spaces.
*/
List<Capability> getResourceCapabilities(String namespace);
/**
* Returns the requirements of this wiring.
*
* <p>
* Only requirements considered by the resolver are returned. For example,
* requirements with
* {@link ResourceConstants#REQUIREMENT_EFFECTIVE_DIRECTIVE effective}
* directive not equal to {@link ResourceConstants#EFFECTIVE_RESOLVE
* resolve} are not returned.
*
* <p>
* A wiring for a non-fragment resource has a subset of the declared
* requirements from the resource and all attached fragment resources. Not
* all declared requirements may be present since some may be discarded. For
* example, if a package is declared to be optionally imported and is not
* actually imported, the requirement must be discarded.
*
* @param namespace The name space of the requirements to return or
* {@code null} to return the requirements from all name spaces.
* @return A list containing a snapshot of the {@link Requirement}s, or an
* empty list if this wiring uses no requirements in the specified
* name space. For a given name space, the list contains the wires
* in the order the requirements were specified in the manifests of
* the {@link #getResource() resource} and the attached fragment
* resources of this wiring. There is no ordering defined between
* requirements in different name spaces.
*/
List<Requirement> getResourceRequirements(String namespace);
/**
* Returns the {@link Wire}s to the provided {@link Capability capabilities}
* of this wiring.
*
* @param namespace The name space of the capabilities for which to return
* wires or {@code null} to return the wires for the capabilities in
* all name spaces.
* @return A list containing a snapshot of the {@link Wire}s for the
* {@link Capability capabilities} of this wiring, or an empty list
* if this wiring has no capabilities in the specified name space.
* For a given name space, the list contains the wires in the order
* the capabilities were specified in the manifests of the
* {@link #getResource() resource} and the attached fragment
* resources of this wiring. There is no ordering defined between
* capabilities in different name spaces.
*/
List<Wire> getProvidedResourceWires(String namespace);
/**
* Returns the {@link Wire}s to the {@link Requirement requirements} in use
* by this wiring.
*
* @param namespace The name space of the requirements for which to return
* wires or {@code null} to return the wires for the requirements in
* all name spaces.
* @return A list containing a snapshot of the {@link Wire}s for the
* {@link Requirement requirements} of this wiring, or an empty list
* if this wiring has no requirements in the specified name space.
* For a given name space, the list contains the wires in the order
* the requirements were specified in the manifests of the
* {@link #getResource() resource} and the attached fragment
* resources of this wiring. There is no ordering defined between
* requirements in different name spaces.
*/
List<Wire> getRequiredResourceWires(String namespace);
/**
* Returns the resource associated with this wiring.
*
* @return The resource associated with this wiring.
*/
Resource getResource();
}
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