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Palantir open source project

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/*
 * (c) Copyright 2018 Palantir Technologies Inc. All rights reserved.
 *
 * Licensed 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 com.palantir.util.paging;

import com.google.common.collect.ImmutableList;
import java.util.ArrayList;
import java.util.List;

public class PageDrainer {
    private final PageGetter pageGetter;

    public PageDrainer(PageGetter pageGetter) {
        this.pageGetter = pageGetter;
    }

    public List drainAllPages() {
        List pages = new ArrayList<>();
        List currentPage = pageGetter.getFirstPage();
        pages.addAll(currentPage);
        while (hasNextPage(currentPage)) {
            currentPage = pageGetter.getNextPage(ImmutableList.copyOf(currentPage));
            pages.addAll(currentPage);
        }

        return pages;
    }

    private boolean hasNextPage(List currentPage) {
        return currentPage.size() >= pageGetter.getPageSize();
    }
}