content: package me.tongfei.progressbar.wrapped;
  
  /*-
   * #%L
   * TongFei ProgressBar
   * %%
   * Copyright (C) 2014 - 2018 Tongfei Chen
   * %%
   * 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.
   * #L%
   */
  
  import java.util.Collection;
  import java.util.Iterator;
  
  /**
   * @author Tongfei Chen
   * @since 0.6.0
   */
  public class ProgressBarWrappedIterable<T> implements Iterable<T> {
  
      Iterable<T> underlying;
      String task;
  
      public ProgressBarWrappedIterable(Iterable<T> underlying, String task) {
          this.underlying = underlying;
          this.task = task;
      }
  
      @Override
      public Iterator<T> iterator() {
          return new ProgressBarWrappedIterator<>(
                  underlying.iterator(),
                  task,
                  sizeOf(underlying)
          );
      }
  
      private long sizeOf(Iterable<?> iterable) {
          // if size unknown, -1, hence indefinite progress bar
          if (iterable instanceof Collection) {
              return ((Collection) iterable).size();
          }
          return -1;
      }
  
  }
  