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Fluent, object-oriented Java API for YouTrack.

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/*
 * Copyright 2017 George Aristy
 *
 * 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 org.llorllale.youtrack.api;

import java.util.function.Function;
import java.util.function.Supplier;

import org.apache.http.client.methods.HttpUriRequest;

/**
 * Combines a supplier of page numbers and a mapper of these numbers to working 
 * {@link HttpUriRequest http requests} where each combination belongs to a distinct {@link Page}
 * of results.
 *
 * @author George Aristy ([email protected])
 * @see Pagination
 * @since 0.7.0
 */
final class PageUri implements Supplier {
  private final Supplier pageNum;
  private final Function combiner;

  /**
   * Primary ctor.
   * 
   * @param pageNum the page number supplier
   * @param combiner accepts a value from {@code pageNum} and produces a working 
   *     {@link HttpUriRequest} for a {@link Page}
   * @since 0.7.0
   */
  PageUri(Supplier pageNum, Function combiner) {
    this.pageNum = pageNum;
    this.combiner = combiner;
  }

  @Override
  public HttpUriRequest get() {
    return this.combiner.apply(this.pageNum.get());
  }
}