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/*
 * Copyright (c) OSGi Alliance (2011, 2013). 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 java.util.Map;
import org.osgi.annotation.versioning.ConsumerType;

/**
 * A capability that has been declared from a {@link Resource}.
 * 
 * 

* 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: e79d11402e14e170443c8a2a9da835391cd1ccc8 $ */ @ConsumerType public interface Capability { /** * Returns the namespace of this capability. * * @return The namespace of this capability. */ String getNamespace(); /** * Returns the directives of this capability. * * @return An unmodifiable map of directive names to directive values for * this capability, or an empty map if this capability has no * directives. */ Map getDirectives(); /** * Returns the attributes of this capability. * * @return An unmodifiable map of attribute names to attribute values for * this capability, or an empty map if this capability has no * attributes. */ Map getAttributes(); /** * Returns the resource declaring this capability. * * @return The resource declaring this capability. */ Resource getResource(); /** * Compares this {@code Capability} to another {@code Capability}. * *

* This {@code Capability} is equal to another {@code Capability} if they * have the same namespace, directives and attributes and are declared by * the same resource. * * @param obj The object to compare against this {@code Capability}. * @return {@code true} if this {@code Capability} is equal to the other * object; {@code false} otherwise. */ boolean equals(Object obj); /** * Returns the hashCode of this {@code Capability}. * * @return The hashCode of this {@code Capability}. */ int hashCode(); }





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