/*

  * 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.utils;

 import org.apache.giraph.conf.ImmutableClassesGiraphConfiguration;

 import org.apache.hadoop.io.WritableComparable;

 import java.io.DataInput;

 import java.io.DataOutput;

 import java.io.IOException;

 import static org.apache.giraph.utils.ByteUtils.SIZE_OF_BYTE;

 import static org.apache.giraph.utils.ByteUtils.SIZE_OF_INT;

 /**

  * Partial implementation of vertexIdData

  *

  * @param <I> vertexId type parameter

  * @param <T> vertexData type parameter

  */

 @SuppressWarnings("unchecked")

 public abstract class AbstractVertexIdData<I extends WritableComparable, T>

   implements VertexIdData<I, T> {

   /** Extended data output */

   protected ExtendedDataOutput extendedDataOutput;

   /** Configuration */

   private ImmutableClassesGiraphConfiguration<I, ?, ?> configuration;

   @Override

   public void initialize() {

     extendedDataOutput = getConf().createExtendedDataOutput();

   }

   @Override

   public void initialize(int expectedSize) {

     extendedDataOutput = getConf().createExtendedDataOutput(expectedSize);

   }

   @Override

   public void add(I vertexId, T data) {

     try {

       vertexId.write(extendedDataOutput);

       writeData(extendedDataOutput, data);

     } catch (IOException e) {

       throw new IllegalStateException("add: IOException", e);

     }

   }

   @Override

   public void add(byte[] serializedId, int idPos, T data) {

     try {

       extendedDataOutput.write(serializedId, 0, idPos);

       writeData(extendedDataOutput, data);

     } catch (IOException e) {

       throw new IllegalStateException("add: IOException", e);

     }

   }

   @Override

   public int getSize() {

     return extendedDataOutput.getPos();

   }

   @Override

   public int getSerializedSize() {

     return SIZE_OF_BYTE + SIZE_OF_INT + getSize();

   }

   @Override

   public boolean isEmpty() {

     return extendedDataOutput.getPos() == 0;

   }

   @Override

   public void clear() {

     extendedDataOutput.reset();

   }

   @Override

   public void setConf(ImmutableClassesGiraphConfiguration configuration) {

     this.configuration = configuration;

   }

   @Override

   public ImmutableClassesGiraphConfiguration<I, ?, ?> getConf() {

     return configuration;

   }

   @Override

   public ByteStructVertexIdDataIterator<I, T> getVertexIdDataIterator() {

     return new ByteStructVertexIdDataIterator<>(this);

   }

   @Override

   public void write(DataOutput output) throws IOException {

     throw new UnsupportedOperationException("not supported");

   }

   @Override

   public void readFields(DataInput dataInput) throws IOException {

     throw new UnsupportedOperationException("not supported");

   }

 }