/*
    * 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.apache.giraph.block_app.framework.block;
  
  import java.util.Arrays;
  import java.util.Iterator;
  import java.util.List;
  
  import org.apache.giraph.block_app.framework.piece.AbstractPiece;
  import org.apache.giraph.function.Consumer;
  
  import com.google.common.collect.Iterables;
  
  /**
   * Block that executes provided blocks sequentially.
   */
  @SuppressWarnings("rawtypes")
  public final class SequenceBlock implements Block {
    private final Block[] blocks;
  
    public SequenceBlock(Block... blocks) {
      this.blocks = blocks.clone();
    }
  
    public SequenceBlock(List<? extends Block> blocks) {
      this.blocks = blocks.toArray(new Block[blocks.size()]);
    }
  
    @Override
    public Iterator<AbstractPiece> iterator() {
      return Iterables.concat(Arrays.asList(blocks)).iterator();
    }
  
    @Override
    public void forAllPossiblePieces(Consumer<AbstractPiece> consumer) {
      for (Block block : blocks) {
        block.forAllPossiblePieces(consumer);
      }
    }
  
    @Override
    public PieceCount getPieceCount() {
      PieceCount ret = new PieceCount(0);
      for (Block block : blocks) {
        ret.add(block.getPieceCount());
      }
      return ret;
    }
  
    @Override
    public String toString() {
      return "SequenceBlock" + Arrays.toString(blocks);
    }
  }