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.ServiceRuntimeException;
022import org.apache.reef.io.serialization.Deserializer;
023
024import java.io.DataInputStream;
025import java.io.IOException;
026import java.io.InputStream;
027import java.util.Iterator;
028
029public class StringDeserializer implements
030    Deserializer<String, InputStream> {
031  @Override
032  public Iterable<String> create(InputStream arg) {
033    final DataInputStream dis = new DataInputStream(arg);
034    return new Iterable<String>() {
035
036      @Override
037      public Iterator<String> iterator() {
038        return new Iterator<String>() {
039
040          @Override
041          public void remove() {
042            throw new UnsupportedOperationException();
043          }
044
045          @Override
046          public String next() {
047            int len = 0;
048            try {
049              len = dis.readInt();
050              byte[] b = new byte[len];
051              dis.readFully(b);
052              return new String(b);
053            } catch (IOException e) {
054              throw new ServiceRuntimeException(e);
055            }
056          }
057
058          @Override
059          public boolean hasNext() {
060            throw new UnsupportedOperationException();
061          }
062        };
063      }
064    };
065  }
066}