Source code

001/**
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *   http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing,
013 * software distributed under the License is distributed on an
014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015 * KIND, either express or implied.  See the License for the
016 * specific language governing permissions and limitations
017 * under the License.
018 */
019package org.apache.reef.io.storage.util;
020
021import org.apache.reef.exception.evaluator.ServiceException;
022import org.apache.reef.io.Accumulable;
023import org.apache.reef.io.Accumulator;
024import org.apache.reef.io.serialization.Serializer;
025
026import java.io.DataOutputStream;
027import java.io.IOException;
028import java.io.OutputStream;
029
030public class StringSerializer implements
031    Serializer<String, OutputStream> {
032  @Override
033  public Accumulable<String> create(OutputStream arg) {
034    final DataOutputStream dos = new DataOutputStream(arg);
035    return new Accumulable<String>() {
036
037      @Override
038      public Accumulator<String> accumulator() throws ServiceException {
039        return new Accumulator<String>() {
040
041          @Override
042          public void add(String datum) throws ServiceException {
043            byte[] b = datum.getBytes();
044            try {
045              dos.writeInt(b.length);
046              dos.write(b);
047            } catch (IOException e) {
048              throw new ServiceException(e);
049            }
050
051          }
052
053          @Override
054          public void close() throws ServiceException {
055            try {
056              dos.close();
057            } catch (IOException e) {
058              throw new ServiceException(e);
059            }
060          }
061        };
062      }
063    };
064  }
065}