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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.Collections;
21  import java.util.Iterator;
22  
23  import org.apache.giraph.block_app.framework.piece.AbstractPiece;
24  import org.apache.giraph.function.Consumer;
25  
26  /**
27   * Block without any pieces
28   */
29  @SuppressWarnings("rawtypes")
30  public final class EmptyBlock implements Block {
31    @Override
32    public Iterator<AbstractPiece> iterator() {
33      return Collections.emptyIterator();
34    }
35  
36    @Override
37    public void forAllPossiblePieces(Consumer<AbstractPiece> consumer) {
38    }
39  }