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/*
* Copyright (c) OSGi Alliance (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.namespace;
import org.osgi.resource.Namespace;
/**
* Identity Capability and Requirement Namespace.
*
* <p>
* This class defines the names for the attributes and directives for this
* namespace. All unspecified capability attributes are of type {@code String}
* and are used as arbitrary matching attributes for the capability. The values
* associated with the specified directive and attribute keys are of type
* {@code String}, unless otherwise indicated.
*
* <p>
* Each resource provides exactly one<sup>†</sup> identity capability that
* can be used to identify the resource.
*
* <p>
* The bundle wiring for the bundle revision provides exactly
* one<sup>†</sup> identity capability.
*
* <p>
* † A resource with no symbolic name must not provide an identity
* capability.
*
* @Immutable
* @version $Id$
*/
public final class IdentityNamespace extends Namespace {
/**
* Namespace name for identity capabilities and requirements.
*
* <p>
* Also, the capability attribute used to specify the symbolic name of the
* resource.
*/
public static final String IDENTITY_NAMESPACE = "osgi.identity";
/**
* The capability directive identifying if the resource is a singleton. A
* {@code String} value of "true" indicates the resource is a
* singleton; any other value or <code>null</code> indicates the resource is
* not a singleton.
*/
public static final String CAPABILITY_SINGLETON_DIRECTIVE = "singleton";
/**
* The capability attribute identifying the {@code Version} of the resource
* if one is specified or {@code 0.0.0} if not specified. The value of this
* attribute must be of type {@code Version}.
*/
public static final String CAPABILITY_VERSION_ATTRIBUTE = "version";
/**
* The capability attribute identifying the resource type. If the resource
* has no type then the value {@link #TYPE_UNKNOWN unknown} must be used for
* the attribute.
*
* @see #TYPE_BUNDLE
* @see #TYPE_FRAGMENT
* @see #TYPE_UNKNOWN
*/
public static final String CAPABILITY_TYPE_ATTRIBUTE = "type";
/**
* The attribute value identifying the resource
* {@link #CAPABILITY_TYPE_ATTRIBUTE type} as an OSGi bundle.
*
* @see #CAPABILITY_TYPE_ATTRIBUTE
*/
public static final String TYPE_BUNDLE = "osgi.bundle";
/**
* The attribute value identifying the resource
* {@link #CAPABILITY_TYPE_ATTRIBUTE type} as an OSGi fragment.
*
* @see #CAPABILITY_TYPE_ATTRIBUTE
*/
public static final String TYPE_FRAGMENT = "osgi.fragment";
/**
* The attribute value identifying the resource
* {@link #CAPABILITY_TYPE_ATTRIBUTE type} as unknown.
*
* @see #CAPABILITY_TYPE_ATTRIBUTE
*/
public static final String TYPE_UNKNOWN = "unknown";
private IdentityNamespace() {
// empty
}
}
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