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/**
 * Copyright (C) 2013 Microsoft Corporation
 *
 * Licensed 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 com.microsoft.reef.io.storage.util;

import com.microsoft.reef.exception.evaluator.ServiceRuntimeException;
import com.microsoft.reef.io.serialization.Deserializer;

import java.io.DataInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Iterator;

public class StringDeserializer implements
    Deserializer {
  @Override
  public Iterable create(InputStream arg) {
    final DataInputStream dis = new DataInputStream(arg);
    return new Iterable() {
      
      @Override
      public Iterator iterator() {
        return new Iterator() {
          
          @Override
          public void remove() {
            throw new UnsupportedOperationException();
          }
          
          @Override
          public String next() {
            int len = 0;
            try {
              len = dis.readInt();
              byte[] b = new byte[len];
              dis.readFully(b);
              return new String(b);
            } catch (IOException e) {
              throw new ServiceRuntimeException(e);
            }
          }
          
          @Override
          public boolean hasNext() {
            throw new UnsupportedOperationException();
          }
        };
      }
    };
  }
}