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jclouds provider for Digital Ocean v2 Compute API, with backported fixes

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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.jclouds.digitalocean2.functions;

import java.net.URI;

import org.jclouds.collect.IterableWithMarker;
import org.jclouds.collect.internal.Arg0ToPagedIterable;
import org.jclouds.digitalocean2.DigitalOcean2Api;
import org.jclouds.digitalocean2.domain.options.ListOptions;

import com.google.common.base.Function;
import com.google.common.base.Optional;

/**
 * Base class to implement the functions that build the
 * PagedIterable. Subclasses just need to override the
 * {@link #fetchPageUsingOptions(ListOptions, Optional)} to invoke the right API
 * method with the given options parameter to get the next page.
 */
public abstract class BaseToPagedIterable extends
      Arg0ToPagedIterable> {
   private final Function linkToOptions;
   protected final DigitalOcean2Api api;

   protected BaseToPagedIterable(DigitalOcean2Api api, Function linkToOptions) {
      this.api = api;
      this.linkToOptions = linkToOptions;
   }

   protected abstract IterableWithMarker fetchPageUsingOptions(O options, Optional