resolver/src/main/java/org/apache/felix/resolver/ResolutionError.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.apache.felix.resolver;

import org.osgi.resource.Requirement;
import org.osgi.service.resolver.ResolutionException;

import java.util.Collection;
import java.util.Collections;

/**
 * Resolution error.
 * This class contains all the needed information to build the ResolutionException
 * without the need to actually compute a user friendly message, which can be
 * quite time consuming.
 */
public abstract class ResolutionError {

    public abstract String getMessage();

    public Collection<Requirement> getUnresolvedRequirements() {
        return Collections.emptyList();
    }

    public abstract ResolutionException toException();

    @Override
    public String toString() {
        return getMessage();
    }
}