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Punya Biswal
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sql/core/src/main/scala/org/apache/spark/sql/JavaTypeInference.scala
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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. | ||
| */ | ||
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| package org.apache.spark.sql | ||
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| import java.beans.Introspector | ||
| import java.lang.{Iterable => JIterable} | ||
| import java.util.{Iterator => JIterator, Map => JMap} | ||
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| import com.google.common.reflect.TypeToken | ||
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| import org.apache.spark.sql.types._ | ||
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| import scala.language.existentials | ||
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| /** | ||
| * Type-inference utilities for POJOs and Java collections. | ||
| */ | ||
| private [sql] object JavaTypeInference { | ||
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| private val iterableType = TypeToken.of(classOf[JIterable[_]]) | ||
| private val mapType = TypeToken.of(classOf[JMap[_, _]]) | ||
| private val iteratorReturnType = classOf[JIterable[_]].getMethod("iterator").getGenericReturnType | ||
| private val nextReturnType = classOf[JIterator[_]].getMethod("next").getGenericReturnType | ||
| private val keySetReturnType = classOf[JMap[_, _]].getMethod("keySet").getGenericReturnType | ||
| private val valuesReturnType = classOf[JMap[_, _]].getMethod("values").getGenericReturnType | ||
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| /** | ||
| * Infers the corresponding SQL data type of a Java type. | ||
| * @param typeToken Java type | ||
| * @return (SQL data type, nullable) | ||
| */ | ||
| private [sql] def inferDataType(typeToken: TypeToken[_]): (DataType, Boolean) = { | ||
| // TODO: All of this could probably be moved to Catalyst as it is mostly not Spark specific. | ||
| typeToken.getRawType match { | ||
| case c: Class[_] if c.isAnnotationPresent(classOf[SQLUserDefinedType]) => | ||
| (c.getAnnotation(classOf[SQLUserDefinedType]).udt().newInstance(), true) | ||
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| case c: Class[_] if c == classOf[java.lang.String] => (StringType, true) | ||
| case c: Class[_] if c == java.lang.Short.TYPE => (ShortType, false) | ||
| case c: Class[_] if c == java.lang.Integer.TYPE => (IntegerType, false) | ||
| case c: Class[_] if c == java.lang.Long.TYPE => (LongType, false) | ||
| case c: Class[_] if c == java.lang.Double.TYPE => (DoubleType, false) | ||
| case c: Class[_] if c == java.lang.Byte.TYPE => (ByteType, false) | ||
| case c: Class[_] if c == java.lang.Float.TYPE => (FloatType, false) | ||
| case c: Class[_] if c == java.lang.Boolean.TYPE => (BooleanType, false) | ||
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| case c: Class[_] if c == classOf[java.lang.Short] => (ShortType, true) | ||
| case c: Class[_] if c == classOf[java.lang.Integer] => (IntegerType, true) | ||
| case c: Class[_] if c == classOf[java.lang.Long] => (LongType, true) | ||
| case c: Class[_] if c == classOf[java.lang.Double] => (DoubleType, true) | ||
| case c: Class[_] if c == classOf[java.lang.Byte] => (ByteType, true) | ||
| case c: Class[_] if c == classOf[java.lang.Float] => (FloatType, true) | ||
| case c: Class[_] if c == classOf[java.lang.Boolean] => (BooleanType, true) | ||
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| case c: Class[_] if c == classOf[java.math.BigDecimal] => (DecimalType(), true) | ||
| case c: Class[_] if c == classOf[java.sql.Date] => (DateType, true) | ||
| case c: Class[_] if c == classOf[java.sql.Timestamp] => (TimestampType, true) | ||
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| case _ if typeToken.isArray => | ||
| val (dataType, nullable) = inferDataType(typeToken.getComponentType) | ||
| (ArrayType(dataType, nullable), true) | ||
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| case _ if mapType.isAssignableFrom(typeToken) => | ||
| val typeToken2 = typeToken.asInstanceOf[TypeToken[_ <: JMap[_, _]]] | ||
| val mapSupertype = typeToken2.getSupertype(classOf[JMap[_, _]]) | ||
| val keyType = elementType(mapSupertype.resolveType(keySetReturnType)) | ||
| val valueType = elementType(mapSupertype.resolveType(valuesReturnType)) | ||
| val (keyDataType, _) = inferDataType(keyType) | ||
| val (valueDataType, nullable) = inferDataType(valueType) | ||
| (MapType(keyDataType, valueDataType, nullable), true) | ||
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| case _ => | ||
| val beanInfo = Introspector.getBeanInfo(typeToken.getRawType) | ||
| val properties = beanInfo.getPropertyDescriptors.filterNot(_.getName == "class") | ||
| val fields = properties.map { property => | ||
| val returnType = typeToken.method(property.getReadMethod).getReturnType | ||
| val (dataType, nullable) = inferDataType(returnType) | ||
| new StructField(property.getName, dataType, nullable) | ||
| } | ||
| (new StructType(fields), true) | ||
| } | ||
| } | ||
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| private def elementType(typeToken: TypeToken[_]): TypeToken[_] = { | ||
| val typeToken2 = typeToken.asInstanceOf[TypeToken[_ <: JIterable[_]]] | ||
| val iterableSupertype = typeToken2.getSupertype(classOf[JIterable[_]]) | ||
| val iteratorType = iterableSupertype.resolveType(iteratorReturnType) | ||
| val itemType = iteratorType.resolveType(nextReturnType) | ||
| itemType | ||
| } | ||
| } |
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