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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.lazy.objectinspector;
 
 import java.util.List;
 
 import  org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector;
 import  org.apache.hadoop.io.Text;

ObjectInspectorFactory is the primary way to create new ObjectInspector instances. SerDe classes should call the static functions in this library to create an ObjectInspector to return to the caller of SerDe2.getObjectInspector(). The reason of having caches here is that ObjectInspectors do not have an internal state - so ObjectInspectors with the same construction parameters should result in exactly the same ObjectInspector.
 
 public final class LazyObjectInspectorFactory {
 
     static ConcurrentHashMap<ArrayList<Object>, LazySimpleStructObjectInspector> cachedLazySimpleStructObjectInspector = new ConcurrentHashMap<ArrayList<Object>, LazySimpleStructObjectInspector>();
 
     public static LazySimpleStructObjectInspector getLazySimpleStructObjectInspector(List<StringstructFieldNames,
             List<ObjectInspector> structFieldObjectInspectorsbyte separator, Text nullSequence,
             boolean lastColumnTakesRestboolean escapedbyte escapeChar) {
         ArrayList<Objectsignature = new ArrayList<Object>();
         signature.add(structFieldNames);
         signature.add(structFieldObjectInspectors);
         signature.add(Byte.valueOf(separator));
         signature.add(nullSequence.toString());
         signature.add(Boolean.valueOf(lastColumnTakesRest));
         signature.add(Boolean.valueOf(escaped));
         signature.add(Byte.valueOf(escapeChar));
         LazySimpleStructObjectInspector result = .get(signature);
         if (result == null) {
             result = new LazySimpleStructObjectInspector(structFieldNamesstructFieldObjectInspectorsseparator,
                     nullSequencelastColumnTakesRestescapedescapeChar);
             .put(signatureresult);
         }
         return result;
     }
 
     static ConcurrentHashMap<ArrayList<Object>, LazyListObjectInspector> cachedLazySimpleListObjectInspector = new ConcurrentHashMap<ArrayList<Object>, LazyListObjectInspector>();
 
     public static LazyListObjectInspector getLazySimpleListObjectInspector(ObjectInspector listElementObjectInspector,
             byte separator, Text nullSequenceboolean escapedbyte escapeChar) {
         ArrayList<Objectsignature = new ArrayList<Object>();
         signature.add(listElementObjectInspector);
         signature.add(Byte.valueOf(separator));
         signature.add(nullSequence.toString());
         signature.add(Boolean.valueOf(escaped));
         signature.add(Byte.valueOf(escapeChar));
         LazyListObjectInspector result = .get(signature);
         if (result == null) {
             result = new LazyListObjectInspector(listElementObjectInspectorseparatornullSequenceescaped,
                     escapeChar);
             .put(signatureresult);
         }
         return result;
     }
 
     static ConcurrentHashMap<ArrayList<Object>, LazyMapObjectInspector> cachedLazySimpleMapObjectInspector = new ConcurrentHashMap<ArrayList<Object>, LazyMapObjectInspector>();
 
     public static LazyMapObjectInspector getLazySimpleMapObjectInspector(ObjectInspector mapKeyObjectInspector,
             ObjectInspector mapValueObjectInspectorbyte itemSeparatorbyte keyValueSeparator, Text nullSequence,
             boolean escapedbyte escapeChar) {
         ArrayList<Objectsignature = new ArrayList<Object>();
         signature.add(mapKeyObjectInspector);
         signature.add(mapValueObjectInspector);
         signature.add(Byte.valueOf(itemSeparator));
         signature.add(Byte.valueOf(keyValueSeparator));
         signature.add(nullSequence.toString());
         signature.add(Boolean.valueOf(escaped));
         signature.add(Byte.valueOf(escapeChar));
         LazyMapObjectInspector result = .get(signature);
         if (result == null) {
             result = new LazyMapObjectInspector(mapKeyObjectInspectormapValueObjectInspectoritemSeparator,
                     keyValueSeparatornullSequenceescapedescapeChar);
             .put(signatureresult);
         }
         return result;
    }
    static ConcurrentHashMap<List<Object>, LazyUnionObjectInspector> cachedLazyUnionObjectInspector = new ConcurrentHashMap<List<Object>, LazyUnionObjectInspector>();
    public static LazyUnionObjectInspector getLazyUnionObjectInspector(List<ObjectInspector> oisbyte separator,
            Text nullSequenceboolean escapedbyte escapeChar) {
        List<Objectsignature = new ArrayList<Object>();
        signature.add(ois);
        signature.add(Byte.valueOf(separator));
        signature.add(nullSequence.toString());
        signature.add(Boolean.valueOf(escaped));
        signature.add(Byte.valueOf(escapeChar));
        LazyUnionObjectInspector result = .get(signature);
        if (result == null) {
            result = new LazyUnionObjectInspector(oisseparatornullSequenceescapedescapeChar);
            .put(signatureresult);
        }
        return result;
    }
    private LazyObjectInspectorFactory() {
        // prevent instantiation
    }
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