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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one
3    * or more contributor license agreements.  See the NOTICE file
4    * distributed with this work for additional information
5    * regarding copyright ownership.  The ASF licenses this file
6    * to you under the Apache License, Version 2.0 (the
7    * "License"); you may not use this file except in compliance
8    * with the License.  You may obtain a copy of the License at
9    *
10   *     http://www.apache.org/licenses/LICENSE-2.0
11   *
12   * Unless required by applicable law or agreed to in writing, software
13   * distributed under the License is distributed on an "AS IS" BASIS,
14   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15   * See the License for the specific language governing permissions and
16   * limitations under the License.
17   */
18  package org.apache.giraph.block_app.framework.block;
19  
20  import java.util.Arrays;
21  import java.util.Iterator;
22  import java.util.List;
23  
24  import org.apache.giraph.block_app.framework.piece.AbstractPiece;
25  import org.apache.giraph.function.Consumer;
26  
27  import com.google.common.collect.Iterables;
28  
29  /**
30   * Block that executes provided blocks sequentially.
31   */
32  @SuppressWarnings("rawtypes")
33  public final class SequenceBlock implements Block {
34    private final Block[] blocks;
35  
36    public SequenceBlock(Block... blocks) {
37      this.blocks = blocks.clone();
38    }
39  
40    public SequenceBlock(List<? extends Block> blocks) {
41      this.blocks = blocks.toArray(new Block[blocks.size()]);
42    }
43  
44    @Override
45    public Iterator<AbstractPiece> iterator() {
46      return Iterables.concat(Arrays.asList(blocks)).iterator();
47    }
48  
49    @Override
50    public void forAllPossiblePieces(Consumer<AbstractPiece> consumer) {
51      for (Block block : blocks) {
52        block.forAllPossiblePieces(consumer);
53      }
54    }
55  
56    @Override
57    public String toString() {
58      return "SequenceBlock" + Arrays.toString(blocks);
59    }
60  }