org.osgi.service.resolver.ResolutionException Maven / Gradle / Ivy
/*
* 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.service.resolver;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import org.osgi.resource.Requirement;
/**
* Indicates failure to resolve a set of requirements.
*
*
* If a resolution failure is caused by a missing mandatory dependency a
* resolver may include any requirements it has considered in the resolution
* exception. Clients may access this set of dependencies via the
* {@link #getUnresolvedRequirements()} method.
*
*
* Resolver implementations may extend this class to provide extra state
* information about the reason for the resolution failure.
*
* @author $Id: 7e9dcb8cd9bd8e69ddfd27f13e7046df346c5f00 $
*/
public class ResolutionException extends Exception {
private static final long serialVersionUID = 1L;
private final transient Collection unresolvedRequirements;
/**
* Create a {@code ResolutionException} with the specified message, cause
* and unresolved requirements.
*
* @param message The message.
* @param cause The cause of this exception.
* @param unresolvedRequirements The unresolved mandatory requirements from
* mandatory resources or {@code null} if no unresolved requirements
* information is provided.
*/
public ResolutionException(String message, Throwable cause, Collection unresolvedRequirements) {
super(message, cause);
if ((unresolvedRequirements == null) || unresolvedRequirements.isEmpty()) {
this.unresolvedRequirements = null;
} else {
this.unresolvedRequirements = Collections.unmodifiableCollection(new ArrayList(unresolvedRequirements));
}
}
/**
* Create a {@code ResolutionException} with the specified message.
*
* @param message The message.
*/
public ResolutionException(String message) {
super(message);
unresolvedRequirements = null;
}
/**
* Create a {@code ResolutionException} with the specified cause.
*
* @param cause The cause of this exception.
*/
public ResolutionException(Throwable cause) {
super(cause);
unresolvedRequirements = null;
}
private static Collection emptyCollection() {
return Collections.EMPTY_LIST;
}
/**
* Return the unresolved requirements, if any, for this exception.
*
*
* The unresolved requirements are provided for informational purposes and
* the specific set of unresolved requirements that are provided after a
* resolve failure is not defined.
*
* @return A collection of the unresolved requirements for this exception.
* The returned collection may be empty if no unresolved
* requirements information is available.
*/
public Collection getUnresolvedRequirements() {
return (unresolvedRequirements != null) ? unresolvedRequirements : emptyCollection();
}
}