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Core base classes for CAMP server implementation

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/*
 * 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.ArrayList;
import java.util.List;

import org.apache.brooklyn.camp.spi.AbstractResource;

public class AggregatingResourceLookup extends AbstractResourceLookup {

    List> targets = new ArrayList>();
    
    @SafeVarargs
    public static  AggregatingResourceLookup of(ResourceLookup ...targets) {
        AggregatingResourceLookup result = new AggregatingResourceLookup();
        for (ResourceLookup item: targets) result.targets.add(item);
        return result;
    }
    
    public static  AggregatingResourceLookup of(Iterable> targets) {
        AggregatingResourceLookup result = new AggregatingResourceLookup();
        for (ResourceLookup item: targets) result.targets.add(item);
        return result;        
    }

    @Override
    public T get(String id) {
        for (ResourceLookup item: targets) {
            T result = item.get(id);
            if (result!=null) return result;
        }
        return null;
    }

    @Override
    public List> links() {
        List> result = new ArrayList>();
        for (ResourceLookup item: targets) result.addAll(item.links());
        return result;
    }

}