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33 changes: 33 additions & 0 deletions
33
record-builder-core/src/main/java/io/soabase/recordbuilder/core/RecordDeconstructor.java
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| /* | ||
| * Copyright 2019 The original author or authors | ||
| * | ||
| * Licensed 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 io.soabase.recordbuilder.core; | ||
|
|
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| import java.lang.annotation.*; | ||
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| @Retention(RetentionPolicy.SOURCE) | ||
| @Target(ElementType.TYPE) | ||
| @Inherited | ||
| public @interface RecordDeconstructor { | ||
| String deconstructorSuffix() default "Tuple"; | ||
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| String fromMethodName() default "from"; | ||
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| @Retention(RetentionPolicy.SOURCE) | ||
| @Target(ElementType.METHOD) | ||
| @interface Component { | ||
| String value() default ""; | ||
| } | ||
| } |
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204 changes: 204 additions & 0 deletions
204
...rc/main/java/io/soabase/recordbuilder/processor/InternalRecordDeconstructorProcessor.java
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| Original file line number | Diff line number | Diff line change |
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| /* | ||
| * Copyright 2019 The original author or authors | ||
| * | ||
| * Licensed 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 io.soabase.recordbuilder.processor; | ||
|
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| import com.squareup.javapoet.*; | ||
| import io.soabase.recordbuilder.core.RecordBuilder; | ||
| import io.soabase.recordbuilder.core.RecordDeconstructor; | ||
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| import javax.annotation.processing.ProcessingEnvironment; | ||
| import javax.lang.model.element.ElementKind; | ||
| import javax.lang.model.element.ExecutableElement; | ||
| import javax.lang.model.element.Modifier; | ||
| import javax.lang.model.element.TypeElement; | ||
| import javax.lang.model.type.TypeKind; | ||
| import javax.tools.Diagnostic; | ||
| import java.util.*; | ||
| import java.util.stream.Collectors; | ||
| import java.util.stream.IntStream; | ||
|
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| import static io.soabase.recordbuilder.processor.ElementUtils.getBuilderName; | ||
| import static io.soabase.recordbuilder.processor.RecordBuilderProcessor.*; | ||
|
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| class InternalRecordDeconstructorProcessor { | ||
| private final ProcessingEnvironment processingEnv; | ||
| private final String packageName; | ||
| private final TypeSpec recordType; | ||
| private final List<Component> recordComponents; | ||
| private final ClassType recordClassType; | ||
| private final List<TypeVariableName> typeVariables; | ||
|
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| private record Component(ExecutableElement element, Optional<String> alternateName) { | ||
| } | ||
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| InternalRecordDeconstructorProcessor(ProcessingEnvironment processingEnv, TypeElement element, | ||
| RecordBuilder.Options metaData, Optional<String> packageNameOpt, boolean fromTemplate) { | ||
| this.processingEnv = processingEnv; | ||
| packageName = packageNameOpt.orElseGet(() -> ElementUtils.getPackageName(element)); | ||
| recordComponents = getRecordComponents(element); | ||
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| ClassType ifaceClassType = ElementUtils.getClassType(element, element.getTypeParameters()); | ||
| recordClassType = ElementUtils.getClassType(packageName, | ||
| getBuilderName(element, metaData, ifaceClassType, metaData.deconstructorSuffix()), | ||
| element.getTypeParameters()); | ||
| typeVariables = element.getTypeParameters().stream().map(TypeVariableName::get).collect(Collectors.toList()); | ||
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| TypeSpec.Builder builder = TypeSpec.recordBuilder(recordClassType.name()).addTypeVariables(typeVariables); | ||
| if (metaData.addClassRetainedGenerated()) { | ||
| builder.addAnnotation(generatedRecordDeconstructorAnnotation); | ||
| } | ||
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| var actualPackage = ElementUtils.getPackageName(element); | ||
| addVisibility(builder, actualPackage.equals(packageName), element.getModifiers()); | ||
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| recordComponents.forEach(component -> { | ||
| String name = component.alternateName.orElseGet(() -> component.element.getSimpleName().toString()); | ||
| FieldSpec parameterSpec = FieldSpec.builder(ClassName.get(component.element.getReturnType()), name).build(); | ||
| builder.addTypeVariables(component.element.getTypeParameters().stream().map(TypeVariableName::get) | ||
| .collect(Collectors.toList())); | ||
| builder.addField(parameterSpec); | ||
| }); | ||
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| addFromMethod(builder, element, metaData.fromMethodName()); | ||
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| recordType = builder.build(); | ||
| } | ||
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| boolean isValid() { | ||
| return !recordComponents.isEmpty(); | ||
| } | ||
|
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| TypeSpec recordType() { | ||
| return recordType; | ||
| } | ||
|
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| String packageName() { | ||
| return packageName; | ||
| } | ||
|
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| ClassType recordClassType() { | ||
| return recordClassType; | ||
| } | ||
|
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| private void addFromMethod(TypeSpec.Builder builder, TypeElement element, String fromName) { | ||
| MethodSpec.Builder methodBuilder = MethodSpec.methodBuilder(fromName) | ||
| .addAnnotation(generatedRecordDeconstructorAnnotation).addModifiers(Modifier.PUBLIC, Modifier.STATIC) | ||
| .returns(recordClassType.typeName()).addTypeVariables(typeVariables) | ||
| .addParameter(ClassName.get(element.asType()), fromName); | ||
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| CodeBlock.Builder codeBuilder = CodeBlock.builder(); | ||
| codeBuilder.add("return new $T(", recordClassType.typeName()); | ||
| IntStream.range(0, recordComponents.size()).forEach(index -> { | ||
| if (index > 0) { | ||
| codeBuilder.add(", "); | ||
| } | ||
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| Component component = recordComponents.get(index); | ||
| codeBuilder.add("$L.$L()", fromName, component.element.getSimpleName()); | ||
| }); | ||
| codeBuilder.addStatement(")"); | ||
|
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| methodBuilder.addCode(codeBuilder.build()); | ||
|
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| builder.addMethod(methodBuilder.build()); | ||
| } | ||
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| private void addVisibility(TypeSpec.Builder builder, boolean builderIsInRecordPackage, Set<Modifier> modifiers) { | ||
| if (builderIsInRecordPackage) { | ||
| if (modifiers.contains(Modifier.PUBLIC) || modifiers.contains(Modifier.PRIVATE) | ||
| || modifiers.contains(Modifier.PROTECTED)) { | ||
| builder.addModifiers(Modifier.PUBLIC); // builders are top level classes - can only be public or | ||
| // package-private | ||
| } | ||
| // is package-private | ||
| } else { | ||
| builder.addModifiers(Modifier.PUBLIC); | ||
| } | ||
| } | ||
|
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| private List<Component> getRecordComponents(TypeElement iface) { | ||
| List<Component> components = new ArrayList<>(); | ||
| try { | ||
| getRecordComponents(iface, components, new HashSet<>(), new HashSet<>()); | ||
| if (components.isEmpty()) { | ||
| processingEnv.getMessager().printMessage(Diagnostic.Kind.ERROR, | ||
| "Annotated interface has no component methods", iface); | ||
| } | ||
| } catch (IllegalDeconstructor e) { | ||
| processingEnv.getMessager().printMessage(Diagnostic.Kind.ERROR, e.getMessage(), iface); | ||
| components = Collections.emptyList(); | ||
| } | ||
| return components; | ||
| } | ||
|
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| private static class IllegalDeconstructor extends RuntimeException { | ||
| public IllegalDeconstructor(String message) { | ||
| super(message); | ||
| } | ||
| } | ||
|
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| private void getRecordComponents(TypeElement iface, Collection<Component> components, Set<String> visitedSet, | ||
| Set<String> usedNames) { | ||
| if (!visitedSet.add(iface.getQualifiedName().toString())) { | ||
| return; | ||
| } | ||
|
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| iface.getEnclosedElements().forEach(element -> { | ||
| RecordDeconstructor.Component component = element.getAnnotation(RecordDeconstructor.Component.class); | ||
|
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| if (component == null) { | ||
| return; | ||
| } | ||
|
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| if (element.getKind() != ElementKind.METHOD || element.getModifiers().contains(Modifier.STATIC) | ||
| || !element.getModifiers().contains(Modifier.PUBLIC)) { | ||
| throw new IllegalDeconstructor(String.format( | ||
| "RecordDeconstructor.Components must be public non-static methods. Bad method: %s.%s()", | ||
| iface.getSimpleName(), element.getSimpleName())); | ||
| } | ||
|
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| ExecutableElement executableElement = (ExecutableElement) element; | ||
|
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| if (!executableElement.getParameters().isEmpty() | ||
| || executableElement.getReturnType().getKind() == TypeKind.VOID) { | ||
| throw new IllegalDeconstructor(String.format( | ||
| "RecordDeconstructor.Components methods must take no arguments and must return a value. Bad method: %s.%s()", | ||
| iface.getSimpleName(), executableElement.getSimpleName())); | ||
| } | ||
| if (!executableElement.getTypeParameters().isEmpty()) { | ||
| throw new IllegalDeconstructor(String.format( | ||
| "RecordDeconstructor.Components methods cannot have type parameters. Bad method: %s.%s()", | ||
| iface.getSimpleName(), element.getSimpleName())); | ||
| } | ||
|
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| if (usedNames.add(element.getSimpleName().toString())) { | ||
| Optional<String> alternateName; | ||
| if (component.value().isEmpty()) { | ||
| alternateName = ElementUtils.stripBeanPrefix(element.getSimpleName().toString()); | ||
| } else { | ||
| alternateName = Optional.of(component.value()); | ||
| } | ||
| components.add(new Component(executableElement, alternateName)); | ||
| } | ||
| }); | ||
|
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| iface.getInterfaces().forEach(parentIface -> { | ||
| TypeElement parentIfaceElement = (TypeElement) processingEnv.getTypeUtils().asElement(parentIface); | ||
| getRecordComponents(parentIfaceElement, components, visitedSet, usedNames); | ||
| }); | ||
| } | ||
|
|
||
| } |
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