/*

  * 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.types;

 import org.apache.hadoop.io.Writable;

 import com.google.common.collect.Maps;

 import java.util.Map;

 import static org.apache.giraph.types.JavaWritablePair.BOOLEAN_BOOLEAN_WRITABLE;

 import static org.apache.giraph.types.JavaWritablePair.BYTE_BYTE_WRITABLE;

 import static org.apache.giraph.types.JavaWritablePair.BYTE_INT_WRITABLE;

 import static org.apache.giraph.types.JavaWritablePair.BYTE_LONG_WRITABLE;

 import static org.apache.giraph.types.JavaWritablePair.DOUBLE_DOUBLE_WRITABLE;

 import static org.apache.giraph.types.JavaWritablePair.FLOAT_DOUBLE_WRITABLE;

 import static org.apache.giraph.types.JavaWritablePair.FLOAT_FLOAT_WRITABLE;

 import static org.apache.giraph.types.JavaWritablePair.INT_INT_WRITABLE;

 import static org.apache.giraph.types.JavaWritablePair.INT_LONG_WRITABLE;

 import static org.apache.giraph.types.JavaWritablePair.LONG_LONG_WRITABLE;

 import static org.apache.giraph.types.JavaWritablePair.SHORT_INT_WRITABLE;

 import static org.apache.giraph.types.JavaWritablePair.SHORT_LONG_WRITABLE;

 /**

  * Mapping of all the known Writable wrappers.

  */

 public class WritableWrappers {

   /** Map of (Writable,Java)-type pair to wrapper for those types */

   private static final Map<JavaWritablePair, WritableWrapper> MAP;

   static {

     MAP = Maps.newHashMap();

     MAP.put(BOOLEAN_BOOLEAN_WRITABLE, new BooleanToBooleanWritableWrapper());

     MAP.put(BYTE_BYTE_WRITABLE, new ByteToByteWritableWrapper());

     MAP.put(BYTE_INT_WRITABLE, new ByteToIntWritableWrapper());

     MAP.put(BYTE_LONG_WRITABLE, new ByteToLongWritableWrapper());

     MAP.put(DOUBLE_DOUBLE_WRITABLE, new DoubleToDoubleWritableWrapper());

     MAP.put(FLOAT_DOUBLE_WRITABLE, new FloatToDoubleWritableWrapper());

     MAP.put(FLOAT_FLOAT_WRITABLE, new FloatToFloatWritableWrapper());

     MAP.put(INT_INT_WRITABLE, new IntToIntWritableWrapper());

     MAP.put(INT_LONG_WRITABLE, new IntToLongWritableWrapper());

     MAP.put(LONG_LONG_WRITABLE, new LongToLongWritableWrapper());

     MAP.put(SHORT_INT_WRITABLE, new ShortToIntWritableWrapper());

     MAP.put(SHORT_LONG_WRITABLE, new ShortToLongWritableWrapper());

   }

   /** Don't construct */

   private WritableWrappers() { }

   /**

    * Lookup type converter

    *

    * @param writableClass class of Writable

    * @param javaClass class of Java type

    * @param <W> Writable type

    * @param <J> Java type

    * @return {@link WritableWrapper}

    */

   public static <W extends Writable, J> WritableWrapper<W, J> lookup(

       Class<W> writableClass, Class<J> javaClass) {

     return lookup(JavaWritablePair.create(writableClass, javaClass));

   }

   /**

    * Lookup type converter

    *

    * @param classes JavaAndWritableClasses

    * @param <W> Writable type

    * @param <J> Java type

    * @return {@link WritableWrapper}

    */

   public static <W extends Writable, J> WritableWrapper<W, J> lookup(

       JavaWritablePair<W, J> classes) {

     return MAP.get(classes);

   }

 }