/**

 * 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.hadoop.hive.serde2.typeinfo;



import java.util.ArrayList;

import java.util.HashMap;

import java.util.List;



import org.apache.hadoop.hive.serde.Constants;

import org.apache.hadoop.hive.serde2.objectinspector.primitive.PrimitiveObjectInspectorUtils;



/**

 * TypeInfoFactory can be used to create the TypeInfo object for any types.

 * 

 * TypeInfo objects are all read-only so we can reuse them easily.

 * TypeInfoFactory has internal cache to make sure we don't create 2 TypeInfo

 * objects that represents the same type.

 */

public final class TypeInfoFactory {



  static HashMap<String, TypeInfo> cachedPrimitiveTypeInfo = new HashMap<String, TypeInfo>();



  private TypeInfoFactory() {

    // prevent instantiation

  }



  public static TypeInfo getPrimitiveTypeInfo(String typeName) {

    if (null == PrimitiveObjectInspectorUtils

        .getTypeEntryFromTypeName(typeName)) {

      throw new RuntimeException("Cannot getPrimitiveTypeInfo for " + typeName);

    }

    TypeInfo result = cachedPrimitiveTypeInfo.get(typeName);

    if (result == null) {

      result = new PrimitiveTypeInfo(typeName);

      cachedPrimitiveTypeInfo.put(typeName, result);

    }

    return result;

  }



  public static final TypeInfo voidTypeInfo = getPrimitiveTypeInfo(Constants.VOID_TYPE_NAME);

  public static final TypeInfo booleanTypeInfo = getPrimitiveTypeInfo(Constants.BOOLEAN_TYPE_NAME);

  public static final TypeInfo intTypeInfo = getPrimitiveTypeInfo(Constants.INT_TYPE_NAME);

  public static final TypeInfo longTypeInfo = getPrimitiveTypeInfo(Constants.BIGINT_TYPE_NAME);

  public static final TypeInfo stringTypeInfo = getPrimitiveTypeInfo(Constants.STRING_TYPE_NAME);

  public static final TypeInfo floatTypeInfo = getPrimitiveTypeInfo(Constants.FLOAT_TYPE_NAME);

  public static final TypeInfo doubleTypeInfo = getPrimitiveTypeInfo(Constants.DOUBLE_TYPE_NAME);

  public static final TypeInfo byteTypeInfo = getPrimitiveTypeInfo(Constants.TINYINT_TYPE_NAME);

  public static final TypeInfo shortTypeInfo = getPrimitiveTypeInfo(Constants.SMALLINT_TYPE_NAME);



  public static final TypeInfo unknownTypeInfo = getPrimitiveTypeInfo("unknown");



  public static TypeInfo getPrimitiveTypeInfoFromPrimitiveWritable(

      Class<?> clazz) {

    String typeName = PrimitiveObjectInspectorUtils

        .getTypeNameFromPrimitiveWritable(clazz);

    if (typeName == null) {

      throw new RuntimeException("Internal error: Cannot get typeName for "

          + clazz);

    }

    return getPrimitiveTypeInfo(typeName);

  }



  public static TypeInfo getPrimitiveTypeInfoFromJavaPrimitive(Class<?> clazz) {

    return getPrimitiveTypeInfo(PrimitiveObjectInspectorUtils

        .getTypeNameFromPrimitiveJava(clazz));

  }



  static HashMap<ArrayList<List<?>>, TypeInfo> cachedStructTypeInfo =

    new HashMap<ArrayList<List<?>>, TypeInfo>();



  public static TypeInfo getStructTypeInfo(List<String> names,

      List<TypeInfo> typeInfos) {

    ArrayList<List<?>> signature = new ArrayList<List<?>>(2);

    signature.add(names);

    signature.add(typeInfos);

    TypeInfo result = cachedStructTypeInfo.get(signature);

    if (result == null) {

      result = new StructTypeInfo(names, typeInfos);

      cachedStructTypeInfo.put(signature, result);

    }

    return result;

  }



  static HashMap<List<?>, TypeInfo> cachedUnionTypeInfo =

    new HashMap<List<?>, TypeInfo>();



  public static TypeInfo getUnionTypeInfo(List<TypeInfo> typeInfos) {

    TypeInfo result = cachedUnionTypeInfo.get(typeInfos);

    if (result == null) {

      result = new UnionTypeInfo(typeInfos);

      cachedUnionTypeInfo.put(typeInfos, result);

    }

    return result;

  }



  static HashMap<TypeInfo, TypeInfo> cachedListTypeInfo = new HashMap<TypeInfo, TypeInfo>();



  public static TypeInfo getListTypeInfo(TypeInfo elementTypeInfo) {

    TypeInfo result = cachedListTypeInfo.get(elementTypeInfo);

    if (result == null) {

      result = new ListTypeInfo(elementTypeInfo);

      cachedListTypeInfo.put(elementTypeInfo, result);

    }

    return result;

  }



  static HashMap<ArrayList<TypeInfo>, TypeInfo> cachedMapTypeInfo =

    new HashMap<ArrayList<TypeInfo>, TypeInfo>();



  public static TypeInfo getMapTypeInfo(TypeInfo keyTypeInfo,

      TypeInfo valueTypeInfo) {

    ArrayList<TypeInfo> signature = new ArrayList<TypeInfo>(2);

    signature.add(keyTypeInfo);

    signature.add(valueTypeInfo);

    TypeInfo result = cachedMapTypeInfo.get(signature);

    if (result == null) {

      result = new MapTypeInfo(keyTypeInfo, valueTypeInfo);

      cachedMapTypeInfo.put(signature, result);

    }

    return result;

  };



}