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sourcegen-generator-java/src/main/java/io/micronaut/sourcegen/javapoet/AnnotationSpec.java
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| @@ -0,0 +1,280 @@ | ||
| /* | ||
| * Copyright (C) 2015 Square, Inc. | ||
| * | ||
| * 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.micronaut.sourcegen.javapoet; | ||
|
|
||
| import javax.lang.model.SourceVersion; | ||
| import javax.lang.model.element.AnnotationMirror; | ||
| import javax.lang.model.element.AnnotationValue; | ||
| import javax.lang.model.element.ExecutableElement; | ||
| import javax.lang.model.element.TypeElement; | ||
| import javax.lang.model.element.VariableElement; | ||
| import javax.lang.model.type.TypeMirror; | ||
| import javax.lang.model.util.SimpleAnnotationValueVisitor8; | ||
| import java.io.IOException; | ||
| import java.lang.annotation.Annotation; | ||
| import java.lang.reflect.Array; | ||
| import java.lang.reflect.Method; | ||
| import java.util.ArrayList; | ||
| import java.util.Arrays; | ||
| import java.util.Comparator; | ||
| import java.util.Iterator; | ||
| import java.util.LinkedHashMap; | ||
| import java.util.List; | ||
| import java.util.Map; | ||
| import java.util.Objects; | ||
|
|
||
| /** A generated annotation on a declaration. */ | ||
| public final class AnnotationSpec { | ||
| public static final String VALUE = "value"; | ||
|
|
||
| public final TypeName type; | ||
| public final Map<String, List<CodeBlock>> members; | ||
|
|
||
| private AnnotationSpec(Builder builder) { | ||
| this.type = builder.type; | ||
| this.members = Util.immutableMultimap(builder.members); | ||
| } | ||
|
|
||
| void emit(CodeWriter codeWriter, boolean inline) throws IOException { | ||
| String whitespace = inline ? "" : "\n"; | ||
| String memberSeparator = inline ? ", " : ",\n"; | ||
| if (members.isEmpty()) { | ||
| // @Singleton | ||
| codeWriter.emit("@$T", type); | ||
| } else if (members.size() == 1 && members.containsKey("value")) { | ||
| // @Named("foo") | ||
| codeWriter.emit("@$T(", type); | ||
| emitAnnotationValues(codeWriter, whitespace, memberSeparator, members.get("value")); | ||
| codeWriter.emit(")"); | ||
| } else { | ||
| // Inline: | ||
| // @Column(name = "updated_at", nullable = false) | ||
| // | ||
| // Not inline: | ||
| // @Column( | ||
| // name = "updated_at", | ||
| // nullable = false | ||
| // ) | ||
| codeWriter.emit("@$T(" + whitespace, type); | ||
| codeWriter.indent(2); | ||
| for (Iterator<Map.Entry<String, List<CodeBlock>>> i | ||
| = members.entrySet().iterator(); i.hasNext(); ) { | ||
| Map.Entry<String, List<CodeBlock>> entry = i.next(); | ||
| codeWriter.emit("$L = ", entry.getKey()); | ||
| emitAnnotationValues(codeWriter, whitespace, memberSeparator, entry.getValue()); | ||
| if (i.hasNext()) codeWriter.emit(memberSeparator); | ||
| } | ||
| codeWriter.unindent(2); | ||
| codeWriter.emit(whitespace + ")"); | ||
| } | ||
| } | ||
|
|
||
| private void emitAnnotationValues(CodeWriter codeWriter, String whitespace, | ||
| String memberSeparator, List<CodeBlock> values) throws IOException { | ||
| if (values.size() == 1) { | ||
| codeWriter.indent(2); | ||
| codeWriter.emit(values.get(0)); | ||
| codeWriter.unindent(2); | ||
| return; | ||
| } | ||
|
|
||
| codeWriter.emit("{" + whitespace); | ||
| codeWriter.indent(2); | ||
| boolean first = true; | ||
| for (CodeBlock codeBlock : values) { | ||
| if (!first) codeWriter.emit(memberSeparator); | ||
| codeWriter.emit(codeBlock); | ||
| first = false; | ||
| } | ||
| codeWriter.unindent(2); | ||
| codeWriter.emit(whitespace + "}"); | ||
| } | ||
|
|
||
| public static AnnotationSpec get(Annotation annotation) { | ||
| return get(annotation, false); | ||
| } | ||
|
|
||
| public static AnnotationSpec get(Annotation annotation, boolean includeDefaultValues) { | ||
| Builder builder = builder(annotation.annotationType()); | ||
| try { | ||
| Method[] methods = annotation.annotationType().getDeclaredMethods(); | ||
| Arrays.sort(methods, Comparator.comparing(Method::getName)); | ||
| for (Method method : methods) { | ||
| Object value = method.invoke(annotation); | ||
| if (!includeDefaultValues) { | ||
| if (Objects.deepEquals(value, method.getDefaultValue())) { | ||
| continue; | ||
| } | ||
| } | ||
| if (value.getClass().isArray()) { | ||
| for (int i = 0; i < Array.getLength(value); i++) { | ||
| builder.addMemberForValue(method.getName(), Array.get(value, i)); | ||
| } | ||
| continue; | ||
| } | ||
| if (value instanceof Annotation) { | ||
| builder.addMember(method.getName(), "$L", get((Annotation) value)); | ||
| continue; | ||
| } | ||
| builder.addMemberForValue(method.getName(), value); | ||
| } | ||
| } catch (Exception e) { | ||
| throw new RuntimeException("Reflecting " + annotation + " failed!", e); | ||
| } | ||
| return builder.build(); | ||
| } | ||
|
|
||
| public static AnnotationSpec get(AnnotationMirror annotation) { | ||
| TypeElement element = (TypeElement) annotation.getAnnotationType().asElement(); | ||
| Builder builder = AnnotationSpec.builder(ClassName.get(element)); | ||
| Visitor visitor = new Visitor(builder); | ||
| for (ExecutableElement executableElement : annotation.getElementValues().keySet()) { | ||
| String name = executableElement.getSimpleName().toString(); | ||
| AnnotationValue value = annotation.getElementValues().get(executableElement); | ||
| value.accept(visitor, name); | ||
| } | ||
| return builder.build(); | ||
| } | ||
|
|
||
| public static Builder builder(ClassName type) { | ||
| Util.checkNotNull(type, "type == null"); | ||
| return new Builder(type); | ||
| } | ||
|
|
||
| public static Builder builder(Class<?> type) { | ||
| return builder(ClassName.get(type)); | ||
| } | ||
|
|
||
| public Builder toBuilder() { | ||
| Builder builder = new Builder(type); | ||
| for (Map.Entry<String, List<CodeBlock>> entry : members.entrySet()) { | ||
| builder.members.put(entry.getKey(), new ArrayList<>(entry.getValue())); | ||
| } | ||
| return builder; | ||
| } | ||
|
|
||
| @Override public boolean equals(Object o) { | ||
| if (this == o) return true; | ||
| if (o == null) return false; | ||
| if (getClass() != o.getClass()) return false; | ||
| return toString().equals(o.toString()); | ||
| } | ||
|
|
||
| @Override public int hashCode() { | ||
| return toString().hashCode(); | ||
| } | ||
|
|
||
| @Override public String toString() { | ||
| StringBuilder out = new StringBuilder(); | ||
| try { | ||
| CodeWriter codeWriter = new CodeWriter(out); | ||
| codeWriter.emit("$L", this); | ||
| return out.toString(); | ||
| } catch (IOException e) { | ||
| throw new AssertionError(); | ||
| } | ||
| } | ||
|
|
||
| public static final class Builder { | ||
| private final TypeName type; | ||
|
|
||
| public final Map<String, List<CodeBlock>> members = new LinkedHashMap<>(); | ||
|
|
||
| private Builder(TypeName type) { | ||
| this.type = type; | ||
| } | ||
|
|
||
| public Builder addMember(String name, String format, Object... args) { | ||
| return addMember(name, CodeBlock.of(format, args)); | ||
| } | ||
|
|
||
| public Builder addMember(String name, CodeBlock codeBlock) { | ||
| List<CodeBlock> values = members.computeIfAbsent(name, k -> new ArrayList<>()); | ||
| values.add(codeBlock); | ||
| return this; | ||
| } | ||
|
|
||
| /** | ||
| * Delegates to {@link #addMember(String, String, Object...)}, with parameter {@code format} | ||
| * depending on the given {@code value} object. Falls back to {@code "$L"} literal format if | ||
| * the class of the given {@code value} object is not supported. | ||
| */ | ||
| Builder addMemberForValue(String memberName, Object value) { | ||
| Util.checkNotNull(memberName, "memberName == null"); | ||
| Util.checkNotNull(value, "value == null, constant non-null value expected for %s", memberName); | ||
| Util.checkArgument(SourceVersion.isName(memberName), "not a valid name: %s", memberName); | ||
| if (value instanceof Class<?>) { | ||
| return addMember(memberName, "$T.class", value); | ||
| } | ||
| if (value instanceof Enum) { | ||
| return addMember(memberName, "$T.$L", value.getClass(), ((Enum<?>) value).name()); | ||
| } | ||
| if (value instanceof String) { | ||
| return addMember(memberName, "$S", value); | ||
| } | ||
| if (value instanceof Float) { | ||
| return addMember(memberName, "$Lf", value); | ||
| } | ||
| if (value instanceof Character) { | ||
| return addMember(memberName, "'$L'", Util.characterLiteralWithoutSingleQuotes((char) value)); | ||
| } | ||
| return addMember(memberName, "$L", value); | ||
| } | ||
|
|
||
| public AnnotationSpec build() { | ||
| for (String name : members.keySet()) { | ||
| Util.checkNotNull(name, "name == null"); | ||
| Util.checkArgument(SourceVersion.isName(name), "not a valid name: %s", name); | ||
| } | ||
| return new AnnotationSpec(this); | ||
| } | ||
| } | ||
|
|
||
| /** | ||
| * Annotation value visitor adding members to the given builder instance. | ||
| */ | ||
| private static class Visitor extends SimpleAnnotationValueVisitor8<Builder, String> { | ||
| final Builder builder; | ||
|
|
||
| Visitor(Builder builder) { | ||
| super(builder); | ||
| this.builder = builder; | ||
| } | ||
|
|
||
| @Override protected Builder defaultAction(Object o, String name) { | ||
| return builder.addMemberForValue(name, o); | ||
| } | ||
|
|
||
| @Override public Builder visitAnnotation(AnnotationMirror a, String name) { | ||
| return builder.addMember(name, "$L", get(a)); | ||
| } | ||
|
|
||
| @Override public Builder visitEnumConstant(VariableElement c, String name) { | ||
| return builder.addMember(name, "$T.$L", c.asType(), c.getSimpleName()); | ||
| } | ||
|
|
||
| @Override public Builder visitType(TypeMirror t, String name) { | ||
| return builder.addMember(name, "$T.class", t); | ||
| } | ||
|
|
||
| @Override public Builder visitArray(List<? extends AnnotationValue> values, String name) { | ||
| for (AnnotationValue value : values) { | ||
| value.accept(this, name); | ||
| } | ||
| return builder; | ||
| } | ||
| } | ||
| } |
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