org.osgi.resource.Wire Maven / Gradle / Ivy
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/*
* Copyright (c) OSGi Alliance (2011, 2015). 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.resource;
import org.osgi.annotation.versioning.ConsumerType;
/**
* A wire connecting a {@link Capability} to a {@link Requirement}.
*
*
* Instances of this type must be effectively immutable. That is, for a
* given instance of this interface, the methods defined by this interface must
* always return the same result.
*
* @ThreadSafe
* @author $Id: a0d1c39e16788708ffab9bb00707554f97f09998 $
*/
@ConsumerType
public interface Wire {
/**
* Returns the {@link Capability} for this wire.
*
* @return The {@link Capability} for this wire.
*/
Capability getCapability();
/**
* Returns the {@link Requirement} for this wire.
*
* @return The {@link Requirement} for this wire.
*/
Requirement getRequirement();
/**
* Returns the resource providing the {@link #getCapability() capability}.
*
*
* The returned resource may differ from the resource referenced by the
* {@link #getCapability() capability}.
*
* @return The resource providing the capability.
*/
Resource getProvider();
/**
* Returns the resource who {@link #getRequirement() requires} the
* {@link #getCapability() capability}.
*
*
* The returned resource may differ from the resource referenced by the
* {@link #getRequirement() requirement}.
*
* @return The resource who requires the capability.
*/
Resource getRequirer();
/**
* Compares this {@code Wire} to another {@code Wire}.
*
*
* This {@code Wire} is equal to another {@code Wire} if they have the same
* capability, requirement, provider and requirer.
*
* @param obj The object to compare against this {@code Wire}.
* @return {@code true} if this {@code Wire} is equal to the other object;
* {@code false} otherwise.
*/
@Override
boolean equals(Object obj);
/**
* Returns the hashCode of this {@code Wire}.
*
* @return The hashCode of this {@code Wire}.
*/
@Override
int hashCode();
}