/*
* 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.brooklyn.camp.spi.collection;
import java.util.Collections;
import java.util.List;
import java.util.NoSuchElementException;
import org.apache.brooklyn.camp.spi.AbstractResource;
public interface ResourceLookup<T extends AbstractResource> {
public abstract T get(String id);
public abstract List<ResolvableLink<T>> links();
public abstract boolean isEmpty();
public static class EmptyResourceLookup<T extends AbstractResource> implements ResourceLookup<T> {
public T get(String id) {
throw new NoSuchElementException("no resource: "+id);
}
public List<ResolvableLink<T>> links() {
return Collections.emptyList();
}
public boolean isEmpty() {
return links().isEmpty();
}
}
}