giraph-block-app/src/main/java/org/apache/giraph/block_app/framework/block/EmptyBlock.java

/*
 * 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.Collections;
import java.util.Iterator;

import org.apache.giraph.block_app.framework.piece.AbstractPiece;
import org.apache.giraph.function.Consumer;

/**
 * Block without any pieces
 */
@SuppressWarnings("rawtypes")
public final class EmptyBlock implements Block {
  @Override
  public Iterator<AbstractPiece> iterator() {
    return Collections.emptyIterator();
  }

  @Override
  public void forAllPossiblePieces(Consumer<AbstractPiece> consumer) {
  }

  @Override
  public PieceCount getPieceCount() {
    return new PieceCount(0);
  }
}