| /* |
| * 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.beam.sdk.schemas.utils; |
| |
| import static org.apache.beam.vendor.guava.v26_0_jre.com.google.common.base.Preconditions.checkArgument; |
| |
| import java.lang.reflect.ParameterizedType; |
| import java.math.BigDecimal; |
| import java.nio.ByteBuffer; |
| import java.util.Collection; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.function.Function; |
| import java.util.stream.Collectors; |
| import org.apache.beam.sdk.schemas.FieldValueTypeInformation; |
| import org.apache.beam.sdk.schemas.Schema; |
| import org.apache.beam.sdk.schemas.Schema.FieldType; |
| import org.apache.beam.sdk.values.TypeDescriptor; |
| import org.apache.beam.vendor.guava.v26_0_jre.com.google.common.collect.ImmutableMap; |
| import org.joda.time.ReadableInstant; |
| |
| /** A set of utilities for inferring a Beam {@link Schema} from static Java types. */ |
| public class StaticSchemaInference { |
| public static List<FieldValueTypeInformation> sortBySchema( |
| List<FieldValueTypeInformation> types, Schema schema) { |
| Map<String, FieldValueTypeInformation> typeMap = |
| types.stream() |
| .collect(Collectors.toMap(FieldValueTypeInformation::getName, Function.identity())); |
| return schema.getFields().stream() |
| .map(f -> typeMap.get(f.getName())) |
| .collect(Collectors.toList()); |
| } |
| |
| enum MethodType { |
| GETTER, |
| SETTER |
| } |
| |
| private static final Map<Class, FieldType> PRIMITIVE_TYPES = |
| ImmutableMap.<Class, FieldType>builder() |
| .put(Byte.class, FieldType.BYTE) |
| .put(byte.class, FieldType.BYTE) |
| .put(Short.class, FieldType.INT16) |
| .put(short.class, FieldType.INT16) |
| .put(Integer.class, FieldType.INT32) |
| .put(int.class, FieldType.INT32) |
| .put(Long.class, FieldType.INT64) |
| .put(long.class, FieldType.INT64) |
| .put(Float.class, FieldType.FLOAT) |
| .put(float.class, FieldType.FLOAT) |
| .put(Double.class, FieldType.DOUBLE) |
| .put(double.class, FieldType.DOUBLE) |
| .put(Boolean.class, FieldType.BOOLEAN) |
| .put(boolean.class, FieldType.BOOLEAN) |
| .put(BigDecimal.class, FieldType.DECIMAL) |
| .build(); |
| |
| /** |
| * Infer a schema from a Java class. |
| * |
| * <p>Takes in a function to extract a list of field types from a class. Different callers may |
| * have different strategies for extracting this list: e.g. introspecting public member variables, |
| * public getter methods, or special annotations on the class. |
| */ |
| public static Schema schemaFromClass( |
| Class<?> clazz, FieldValueTypeSupplier fieldValueTypeSupplier) { |
| Schema.Builder builder = Schema.builder(); |
| for (FieldValueTypeInformation type : fieldValueTypeSupplier.get(clazz)) { |
| Schema.FieldType fieldType = fieldFromType(type.getType(), fieldValueTypeSupplier); |
| if (type.isNullable()) { |
| builder.addNullableField(type.getName(), fieldType); |
| } else { |
| builder.addField(type.getName(), fieldType); |
| } |
| } |
| return builder.build(); |
| } |
| |
| /** Map a Java field type to a Beam Schema FieldType. */ |
| public static Schema.FieldType fieldFromType( |
| TypeDescriptor type, FieldValueTypeSupplier fieldValueTypeSupplier) { |
| FieldType primitiveType = PRIMITIVE_TYPES.get(type.getRawType()); |
| if (primitiveType != null) { |
| return primitiveType; |
| } |
| |
| if (type.isArray()) { |
| // If the type is T[] where T is byte, this is a BYTES type. |
| TypeDescriptor component = type.getComponentType(); |
| if (component.getRawType().equals(byte.class)) { |
| return FieldType.BYTES; |
| } else { |
| // Otherwise this is an array type. |
| return FieldType.array(fieldFromType(component, fieldValueTypeSupplier)); |
| } |
| } else if (type.isSubtypeOf(TypeDescriptor.of(Collection.class))) { |
| TypeDescriptor<Collection<?>> collection = type.getSupertype(Collection.class); |
| if (collection.getType() instanceof ParameterizedType) { |
| ParameterizedType ptype = (ParameterizedType) collection.getType(); |
| java.lang.reflect.Type[] params = ptype.getActualTypeArguments(); |
| checkArgument(params.length == 1); |
| return FieldType.array(fieldFromType(TypeDescriptor.of(params[0]), fieldValueTypeSupplier)); |
| } else { |
| throw new RuntimeException("Cannot infer schema from unparameterized collection."); |
| } |
| } else if (type.isSubtypeOf(TypeDescriptor.of(Map.class))) { |
| TypeDescriptor<Collection<?>> map = type.getSupertype(Map.class); |
| if (map.getType() instanceof ParameterizedType) { |
| ParameterizedType ptype = (ParameterizedType) map.getType(); |
| java.lang.reflect.Type[] params = ptype.getActualTypeArguments(); |
| checkArgument(params.length == 2); |
| FieldType keyType = fieldFromType(TypeDescriptor.of(params[0]), fieldValueTypeSupplier); |
| FieldType valueType = fieldFromType(TypeDescriptor.of(params[1]), fieldValueTypeSupplier); |
| checkArgument( |
| keyType.getTypeName().isPrimitiveType(), |
| "Only primitive types can be map keys. type: " + keyType.getTypeName()); |
| return FieldType.map(keyType, valueType); |
| } else { |
| throw new RuntimeException("Cannot infer schema from unparameterized map."); |
| } |
| } else if (type.isSubtypeOf(TypeDescriptor.of(CharSequence.class))) { |
| return FieldType.STRING; |
| } else if (type.isSubtypeOf(TypeDescriptor.of(ReadableInstant.class))) { |
| return FieldType.DATETIME; |
| } else if (type.isSubtypeOf(TypeDescriptor.of(ByteBuffer.class))) { |
| return FieldType.BYTES; |
| } else { |
| return FieldType.row(schemaFromClass(type.getRawType(), fieldValueTypeSupplier)); |
| } |
| } |
| } |