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| 1 | +/* |
| 2 | + * Copyright 2010-2018 Amazon.com, Inc. or its affiliates. All Rights Reserved. |
| 3 | + * |
| 4 | + * Licensed under the Apache License, Version 2.0 (the "License"). |
| 5 | + * You may not use this file except in compliance with the License. |
| 6 | + * A copy of the License is located at |
| 7 | + * |
| 8 | + * http://aws.amazon.com/apache2.0 |
| 9 | + * |
| 10 | + * or in the "license" file accompanying this file. This file is distributed |
| 11 | + * on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either |
| 12 | + * express or implied. See the License for the specific language governing |
| 13 | + * permissions and limitations under the License. |
| 14 | + */ |
| 15 | + |
| 16 | +package software.amazon.awssdk.codegen.lite.regions; |
| 17 | + |
| 18 | +import static javax.lang.model.element.Modifier.FINAL; |
| 19 | +import static javax.lang.model.element.Modifier.PRIVATE; |
| 20 | +import static javax.lang.model.element.Modifier.PUBLIC; |
| 21 | +import static javax.lang.model.element.Modifier.STATIC; |
| 22 | + |
| 23 | +import com.squareup.javapoet.AnnotationSpec; |
| 24 | +import com.squareup.javapoet.ClassName; |
| 25 | +import com.squareup.javapoet.CodeBlock; |
| 26 | +import com.squareup.javapoet.FieldSpec; |
| 27 | +import com.squareup.javapoet.MethodSpec; |
| 28 | +import com.squareup.javapoet.ParameterizedTypeName; |
| 29 | +import com.squareup.javapoet.TypeName; |
| 30 | +import com.squareup.javapoet.TypeSpec; |
| 31 | +import java.util.Arrays; |
| 32 | +import java.util.Collections; |
| 33 | +import java.util.List; |
| 34 | +import java.util.Locale; |
| 35 | +import java.util.Set; |
| 36 | +import java.util.concurrent.ConcurrentHashMap; |
| 37 | +import java.util.stream.Collectors; |
| 38 | +import software.amazon.awssdk.annotations.Generated; |
| 39 | +import software.amazon.awssdk.annotations.SdkPublicApi; |
| 40 | +import software.amazon.awssdk.codegen.lite.PoetClass; |
| 41 | +import software.amazon.awssdk.codegen.lite.regions.model.Partitions; |
| 42 | +import software.amazon.awssdk.utils.Validate; |
| 43 | + |
| 44 | +public class RegionGenerator implements PoetClass { |
| 45 | + |
| 46 | + private final Partitions partitions; |
| 47 | + private final String basePackage; |
| 48 | + |
| 49 | + public RegionGenerator(Partitions partitions, |
| 50 | + String basePackage) { |
| 51 | + this.partitions = partitions; |
| 52 | + this.basePackage = basePackage; |
| 53 | + } |
| 54 | + |
| 55 | + @Override |
| 56 | + public TypeSpec poetClass() { |
| 57 | + TypeSpec.Builder builder = TypeSpec.classBuilder(className()) |
| 58 | + .addModifiers(FINAL, PUBLIC) |
| 59 | + .addAnnotation(SdkPublicApi.class) |
| 60 | + .addAnnotation(AnnotationSpec.builder(Generated.class) |
| 61 | + .addMember("value", |
| 62 | + "$S", |
| 63 | + "software.amazon.awssdk:codegen") |
| 64 | + .build()) |
| 65 | + .addMethod(MethodSpec.constructorBuilder() |
| 66 | + .addModifiers(PRIVATE) |
| 67 | + .addParameter(String.class, "id") |
| 68 | + .addParameter(boolean.class, "isGlobalRegion") |
| 69 | + .addStatement("this.id = id") |
| 70 | + .addStatement("this.isGlobalRegion = isGlobalRegion") |
| 71 | + .build()); |
| 72 | + regions(builder); |
| 73 | + |
| 74 | + builder.addField(FieldSpec.builder(boolean.class, "isGlobalRegion") |
| 75 | + .addModifiers(FINAL, PRIVATE) |
| 76 | + .build()) |
| 77 | + .addField(FieldSpec.builder(String.class, "id") |
| 78 | + .addModifiers(FINAL, PRIVATE) |
| 79 | + .build()) |
| 80 | + .addMethod(regionOf()) |
| 81 | + .addMethod(regionOfGlobal()) |
| 82 | + .addMethod(id()) |
| 83 | + .addMethod(regionsGetter()) |
| 84 | + .addMethod(isGlobalRegion()) |
| 85 | + .addMethod(regionToString()); |
| 86 | + |
| 87 | + return builder.addType(cache()).build(); |
| 88 | + } |
| 89 | + |
| 90 | + private void regions(TypeSpec.Builder builder) { |
| 91 | + Set<String> regions = partitions.getPartitions() |
| 92 | + .stream() |
| 93 | + .flatMap(p -> p.getRegions().keySet().stream()) |
| 94 | + .collect(Collectors.toSet()); |
| 95 | + |
| 96 | + CodeBlock.Builder regionsArray = CodeBlock.builder() |
| 97 | + .add("$T.unmodifiableList($T.asList(", Collections.class, Arrays.class); |
| 98 | + |
| 99 | + String regionsCodeBlock = regions.stream().map(r -> { |
| 100 | + builder.addField(FieldSpec.builder(className(), regionName(r)) |
| 101 | + .addModifiers(PUBLIC, STATIC, FINAL) |
| 102 | + .initializer("$T.of($S)", className(), r) |
| 103 | + .build()); |
| 104 | + return regionName(r); |
| 105 | + }).collect(Collectors.joining(", ")); |
| 106 | + |
| 107 | + addGlobalRegions(builder); |
| 108 | + |
| 109 | + regionsArray.add(regionsCodeBlock + ", ").add("AWS_GLOBAL, ").add("AWS_CN_GLOBAL, ").add("AWS_US_GOV_GLOBAL"); |
| 110 | + regionsArray.add("))"); |
| 111 | + |
| 112 | + TypeName listOfRegions = ParameterizedTypeName.get(ClassName.get(List.class), className()); |
| 113 | + builder.addField(FieldSpec.builder(listOfRegions, "REGIONS") |
| 114 | + .addModifiers(PRIVATE, STATIC, FINAL) |
| 115 | + .initializer(regionsArray.build()).build()); |
| 116 | + } |
| 117 | + |
| 118 | + private void addGlobalRegions(TypeSpec.Builder builder) { |
| 119 | + builder.addField(FieldSpec.builder(className(), "AWS_GLOBAL") |
| 120 | + .addModifiers(PUBLIC, STATIC, FINAL) |
| 121 | + .initializer("$T.of($S, true)", className(), "aws-global") |
| 122 | + .build()) |
| 123 | + .addField(FieldSpec.builder(className(), "AWS_CN_GLOBAL") |
| 124 | + .addModifiers(PUBLIC, STATIC, FINAL) |
| 125 | + .initializer("$T.of($S, true)", className(), "aws-cn-global") |
| 126 | + .build()) |
| 127 | + .addField(FieldSpec.builder(className(), "AWS_US_GOV_GLOBAL") |
| 128 | + .addModifiers(PUBLIC, STATIC, FINAL) |
| 129 | + .initializer("$T.of($S, true)", className(), "aws-us-gov-global") |
| 130 | + .build()); |
| 131 | + } |
| 132 | + |
| 133 | + private String regionName(String region) { |
| 134 | + return region.replace("-", "_").toUpperCase(Locale.US); |
| 135 | + } |
| 136 | + |
| 137 | + private MethodSpec regionOf() { |
| 138 | + return MethodSpec.methodBuilder("of") |
| 139 | + .addModifiers(PUBLIC, STATIC) |
| 140 | + .addParameter(String.class, "value") |
| 141 | + .returns(className()) |
| 142 | + .addStatement("return of($L, false)", "value") |
| 143 | + .build(); |
| 144 | + |
| 145 | + } |
| 146 | + |
| 147 | + private MethodSpec regionOfGlobal() { |
| 148 | + return MethodSpec.methodBuilder("of") |
| 149 | + .addModifiers(PRIVATE, STATIC) |
| 150 | + .addParameter(String.class, "value") |
| 151 | + .addParameter(boolean.class, "isGlobalRegion") |
| 152 | + .returns(className()) |
| 153 | + .addStatement("$T.paramNotBlank($L, $S)", Validate.class, "value", "region") |
| 154 | + .addStatement("return $L.put($L, $L)", "RegionCache", "value", "isGlobalRegion") |
| 155 | + .build(); |
| 156 | + |
| 157 | + } |
| 158 | + |
| 159 | + private MethodSpec id() { |
| 160 | + return MethodSpec.methodBuilder("id") |
| 161 | + .addModifiers(PUBLIC) |
| 162 | + .returns(String.class) |
| 163 | + .addStatement("return this.id") |
| 164 | + .build(); |
| 165 | + } |
| 166 | + |
| 167 | + private MethodSpec regionsGetter() { |
| 168 | + return MethodSpec.methodBuilder("regions") |
| 169 | + .addModifiers(PUBLIC, STATIC) |
| 170 | + .returns(ParameterizedTypeName.get(ClassName.get(List.class), |
| 171 | + className())) |
| 172 | + .addStatement("return $L", "REGIONS") |
| 173 | + .build(); |
| 174 | + } |
| 175 | + |
| 176 | + private MethodSpec isGlobalRegion() { |
| 177 | + return MethodSpec.methodBuilder("isGlobalRegion") |
| 178 | + .addModifiers(PUBLIC) |
| 179 | + .returns(boolean.class) |
| 180 | + .addStatement("return $L", "isGlobalRegion") |
| 181 | + .build(); |
| 182 | + } |
| 183 | + |
| 184 | + private MethodSpec regionToString() { |
| 185 | + return MethodSpec.methodBuilder("toString") |
| 186 | + .addAnnotation(Override.class) |
| 187 | + .addModifiers(PUBLIC) |
| 188 | + .returns(String.class) |
| 189 | + .addStatement("return $L", "id") |
| 190 | + .build(); |
| 191 | + } |
| 192 | + |
| 193 | + private TypeSpec cache() { |
| 194 | + ParameterizedTypeName mapOfStringRegion = ParameterizedTypeName.get(ClassName.get(ConcurrentHashMap.class), |
| 195 | + ClassName.get(String.class), |
| 196 | + className()); |
| 197 | + |
| 198 | + return TypeSpec.classBuilder("RegionCache") |
| 199 | + .addModifiers(PRIVATE, STATIC) |
| 200 | + .addField(FieldSpec.builder(mapOfStringRegion, "VALUES") |
| 201 | + .addModifiers(PRIVATE, STATIC, FINAL) |
| 202 | + .initializer("new $T<>()", ConcurrentHashMap.class) |
| 203 | + .build()) |
| 204 | + |
| 205 | + .addMethod(MethodSpec.constructorBuilder().addModifiers(PRIVATE).build()) |
| 206 | + .addMethod(MethodSpec.methodBuilder("put") |
| 207 | + .addModifiers(PRIVATE, STATIC) |
| 208 | + .addParameter(String.class, "value") |
| 209 | + .addParameter(boolean.class, "isGlobalRegion") |
| 210 | + .returns(className()) |
| 211 | + .addStatement("return $L.computeIfAbsent(value, v -> new $T(value, isGlobalRegion))", |
| 212 | + "VALUES", |
| 213 | + className()) |
| 214 | + .build()) |
| 215 | + .build(); |
| 216 | + } |
| 217 | + |
| 218 | + @Override |
| 219 | + public ClassName className() { |
| 220 | + return ClassName.get(basePackage, "Region"); |
| 221 | + } |
| 222 | +} |
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