org.jclouds.cloudsigma2.domain.PaginatedCollection.java Source code

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Here is the source code for org.jclouds.cloudsigma2.domain.PaginatedCollection.java

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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.cloudsigma2.domain;

import com.google.common.base.Optional;
import org.jclouds.cloudsigma2.options.PaginationOptions;
import org.jclouds.collect.IterableWithMarker;

import java.util.Iterator;

/**
 * @author Vladimir Shevchenko
 */
public class PaginatedCollection<T> extends IterableWithMarker<T> {

    private Iterable<T> objects;
    private PaginationOptions paginationOptions;

    public PaginatedCollection(Iterable<T> objects, PaginationOptions paginationOptions) {
        this.objects = objects;
        this.paginationOptions = paginationOptions;
    }

    @Override
    public Optional<Object> nextMarker() {
        if (paginationOptions.getLimit() == 0) {
            return Optional.absent();
        }

        if (paginationOptions.getTotalCount() - paginationOptions.getOffset() > paginationOptions.getLimit()) {
            return Optional.of((Object) new PaginationOptions.Builder().limit(paginationOptions.getLimit())
                    .offset(paginationOptions.getOffset() + paginationOptions.getLimit()).build());
        }

        return Optional.absent();
    }

    @Override
    public Iterator<T> iterator() {
        return objects.iterator();
    }
}