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Support jclouds API for provisioning cloud locations

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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.location.jclouds.pool;

import java.util.Iterator;
import java.util.LinkedHashSet;
import java.util.Set;

import javax.annotation.concurrent.Immutable;

import org.jclouds.compute.domain.NodeMetadata;

import com.google.common.base.Predicate;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.Iterables;

@Immutable
public class MachineSet implements Iterable {

    final Set members;
    
    public MachineSet(Iterable m) { 
        members = ImmutableSet.copyOf(m); 
    }
    public MachineSet(NodeMetadata ...nodes) {
        members = ImmutableSet.copyOf(nodes); 
    }

    @Override
    public Iterator iterator() {
        return members.iterator();
    }

    public MachineSet removed(MachineSet toRemove) {
        Set s = new LinkedHashSet(members);
        for (NodeMetadata m: toRemove) s.remove(m);
        return new MachineSet(s);
    }
    public MachineSet added(MachineSet toAdd) {
        Set s = new LinkedHashSet(members);
        for (NodeMetadata m: toAdd) s.add(m);
        return new MachineSet(s);
    }

    @SuppressWarnings("unchecked")
    public MachineSet filtered(Predicate criterion) {
        // To avoid generics complaints in callers caused by varargs, overload here
        return filtered(new Predicate[] {criterion});
    }

    public MachineSet filtered(Predicate ...criteria) {
        return new MachineSet(Iterables.filter(members, MachinePoolPredicates.compose(criteria)));
    }

    public int size() {
        return members.size();
    }
    
    public boolean isEmpty() {
        return members.isEmpty();
    }
    
    public boolean contains(NodeMetadata input) {
        return members.contains(input);
    }
    
    @Override
    public String toString() {
        return members.toString();
    }
    
    @Override
    public int hashCode() {
        return members.hashCode();
    }
    
    @Override
    public boolean equals(Object obj) {
        return (obj instanceof MachineSet) && (members.equals( ((MachineSet)obj).members ));
    }
    
}