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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.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 ConcurrentHashMap<String, TypeInfo> cachedPrimitiveTypeInfo = new ConcurrentHashMap<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 = .get(typeName);
         if (result == null) {
             result = new PrimitiveTypeInfo(typeName);
             .put(typeNameresult);
         }
         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 ConcurrentHashMap<ArrayList<List<?>>, TypeInfo> cachedStructTypeInfo = new ConcurrentHashMap<ArrayList<List<?>>, TypeInfo>();
 
     public static TypeInfo getStructTypeInfo(List<StringnamesList<TypeInfo> typeInfos) {
         ArrayList<List<?>> signature = new ArrayList<List<?>>(2);
         signature.add(names);
         signature.add(typeInfos);
         TypeInfo result = .get(signature);
         if (result == null) {
             result = new StructTypeInfo(namestypeInfos);
             .put(signatureresult);
         }
         return result;
     }
 
     static ConcurrentHashMap<List<?>, TypeInfo> cachedUnionTypeInfo = new ConcurrentHashMap<List<?>, TypeInfo>();
 
     public static TypeInfo getUnionTypeInfo(List<TypeInfo> typeInfos) {
         TypeInfo result = .get(typeInfos);
         if (result == null) {
             result = new UnionTypeInfo(typeInfos);
             .put(typeInfosresult);
         }
        return result;
    }
    static ConcurrentHashMap<TypeInfo, TypeInfo> cachedListTypeInfo = new ConcurrentHashMap<TypeInfo, TypeInfo>();
    public static TypeInfo getListTypeInfo(TypeInfo elementTypeInfo) {
        TypeInfo result = .get(elementTypeInfo);
        if (result == null) {
            result = new ListTypeInfo(elementTypeInfo);
            .put(elementTypeInforesult);
        }
        return result;
    }
    static ConcurrentHashMap<ArrayList<TypeInfo>, TypeInfo> cachedMapTypeInfo = new ConcurrentHashMap<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 = .get(signature);
        if (result == null) {
            result = new MapTypeInfo(keyTypeInfovalueTypeInfo);
            .put(signatureresult);
        }
        return result;
    };
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