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 me.tongfei.progressbar.ProgressBar;
  import org.osgl.util.E;
  
  import java.util.Iterator;
  
  /**
   * @author Tongfei Chen
   * @since 0.6.0
   */
  public class ProgressBarWrappedIterator<T> implements Iterator<T> {
  
      Iterator<T> underlying;
      ProgressBar pb;
  
      public ProgressBarWrappedIterator(Iterator<T> underlying, String task, long size) {
          this.underlying = underlying;
          pb = new ProgressBar(task, size).start();
      }
  
      @Override
      public boolean hasNext() {
          boolean r = underlying.hasNext();
          if (!r) pb.stop();
          return r;
      }
  
      @Override
      public T next() {
          T r = underlying.next();
          pb.step();
          return r;
      }
  
      @Override
      public void remove() {
          throw E.unsupport();
      }
  }
  