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io.jooby.internal.apt.MvcRoute Maven / Gradle / Ivy
/*
* Jooby https://jooby.io
* Apache License Version 2.0 https://jooby.io/LICENSE.txt
* Copyright 2014 Edgar Espina
*/
package io.jooby.internal.apt;
import static io.jooby.internal.apt.AnnotationSupport.*;
import static io.jooby.internal.apt.CodeBlock.*;
import static java.lang.System.lineSeparator;
import static java.util.Optional.ofNullable;
import java.util.*;
import java.util.function.Function;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import javax.lang.model.element.*;
import javax.lang.model.type.TypeKind;
import javax.lang.model.type.TypeMirror;
import javax.lang.model.type.WildcardType;
public class MvcRoute {
private final MvcContext context;
private final MvcRouter router;
private final ExecutableElement method;
private final Map annotationMap = new LinkedHashMap<>();
private final List parameters;
private final TypeDefinition returnType;
private String generatedName;
private final boolean suspendFun;
public MvcRoute(MvcContext context, MvcRouter router, ExecutableElement method) {
this.context = context;
this.router = router;
this.method = method;
this.parameters =
method.getParameters().stream().map(it -> new MvcParameter(context, this, it)).toList();
this.suspendFun =
!parameters.isEmpty()
&& parameters.get(parameters.size() - 1).getType().is("kotlin.coroutines.Continuation");
this.returnType =
new TypeDefinition(
context.getProcessingEnvironment().getTypeUtils(), method.getReturnType());
}
public MvcRoute(MvcContext context, MvcRouter router, MvcRoute route) {
this.context = context;
this.router = router;
this.method = route.method;
this.parameters =
method.getParameters().stream().map(it -> new MvcParameter(context, this, it)).toList();
this.returnType =
new TypeDefinition(
context.getProcessingEnvironment().getTypeUtils(), method.getReturnType());
this.suspendFun = route.suspendFun;
route.annotationMap.keySet().forEach(this::addHttpMethod);
}
public MvcContext getContext() {
return context;
}
public TypeDefinition getReturnType() {
var processingEnv = context.getProcessingEnvironment();
var types = processingEnv.getTypeUtils();
var elements = processingEnv.getElementUtils();
if (returnType.isVoid()) {
return new TypeDefinition(types, elements.getTypeElement("io.jooby.StatusCode").asType());
} else if (isSuspendFun()) {
var continuation = parameters.get(parameters.size() - 1).getType();
if (!continuation.getArguments().isEmpty()) {
var continuationReturnType = continuation.getArguments().get(0).getType();
if (continuationReturnType instanceof WildcardType wildcardType) {
return Stream.of(wildcardType.getSuperBound(), wildcardType.getExtendsBound())
.filter(Objects::nonNull)
.findFirst()
.map(e -> new TypeDefinition(types, e))
.orElseGet(() -> new TypeDefinition(types, continuationReturnType));
} else {
return new TypeDefinition(types, continuationReturnType);
}
}
}
return returnType;
}
public TypeMirror getReturnTypeHandler() {
return getReturnType().getRawType();
}
public List generateMapping(boolean kt) {
List block = new ArrayList<>();
var methodName = getGeneratedName();
var returnType = getReturnType();
var paramString = String.join(", ", getJavaMethodSignature(kt));
var javadocLink = javadocComment(kt);
var attributeGenerator = new RouteAttributesGenerator(context);
var routes = router.getRoutes();
var lastRoute = routes.get(routes.size() - 1).equals(this);
var entries = annotationMap.entrySet().stream().toList();
var thisRef =
isSuspendFun()
? "this@"
+ context.generateRouterName(router.getTargetType().getSimpleName().toString())
+ "::"
: "this::";
for (var e : entries) {
var lastHttpMethod = lastRoute && entries.get(entries.size() - 1).equals(e);
var annotation = e.getKey();
var httpMethod = HttpMethod.findByAnnotationName(annotation.getQualifiedName().toString());
var paths = context.path(router.getTargetType(), method, annotation);
for (var path : paths) {
var lastLine = lastHttpMethod && paths.get(paths.size() - 1).equals(path);
block.add(javadocLink);
block.add(
statement(
isSuspendFun() ? "" : "app.",
annotation.getSimpleName().toString().toLowerCase(),
"(",
string(leadingSlash(path)),
", ",
context.pipeline(
getReturnTypeHandler(), methodReference(kt, thisRef, methodName))));
if (context.nonBlocking(getReturnTypeHandler()) || isSuspendFun()) {
block.add(statement(indent(2), ".setNonBlocking(true)"));
}
/* consumes */
mediaType(httpMethod::consumes)
.ifPresent(consumes -> block.add(statement(indent(2), ".setConsumes(", consumes, ")")));
/* produces */
mediaType(httpMethod::produces)
.ifPresent(produces -> block.add(statement(indent(2), ".setProduces(", produces, ")")));
/* dispatch */
dispatch()
.ifPresent(
dispatch ->
block.add(statement(indent(2), ".setExecutorKey(", string(dispatch), ")")));
/* attributes */
attributeGenerator
.toSourceCode(kt, this, 2)
.ifPresent(
attributes -> block.add(statement(indent(2), ".setAttributes(", attributes, ")")));
/* returnType */
block.add(statement(indent(2), ".setReturnType(", returnType.toSourceCode(kt), ")"));
/* mvcMethod */
var lineSep = lastLine ? lineSeparator() : lineSeparator() + lineSeparator();
block.add(
CodeBlock.of(
indent(2),
".setMvcMethod(",
router.getTargetType().getSimpleName(),
clazz(kt),
".getMethod(",
string(getMethodName()),
paramString.isEmpty() ? "" : ", " + paramString,
"))",
semicolon(kt),
lineSep));
}
}
return block;
}
private String methodReference(boolean kt, String thisRef, String methodName) {
if (kt) {
var returnType = getReturnType();
var generics = returnType.getArgumentsString(kt, true, Set.of(TypeKind.TYPEVAR));
if (!generics.isEmpty()) {
return CodeBlock.of(") { ctx -> ", methodName, generics, "(ctx) }");
}
}
return thisRef + methodName + ")";
}
/**
* Ensure path start with a /(leading slash).
*
* @param path Path to process.
* @return Path with leading slash.
*/
static String leadingSlash(String path) {
if (path == null || path.isEmpty() || path.equals("/")) {
return "/";
}
return path.charAt(0) == '/' ? path : "/" + path;
}
public List generateHandlerCall(boolean kt) {
var buffer = new ArrayList();
/* Parameters */
var paramList = new StringJoiner(", ", "(", ")");
for (var parameter : getParameters(true)) {
paramList.add(parameter.generateMapping(kt));
}
var throwsException = !method.getThrownTypes().isEmpty();
var returnTypeGenerics =
getReturnType().getArgumentsString(kt, false, Set.of(TypeKind.TYPEVAR));
var returnTypeString = type(kt, getReturnType().toString());
if (kt) {
if (throwsException) {
buffer.add(statement("@Throws(Exception::class)"));
}
if (isSuspendFun()) {
buffer.add(
statement(
"suspend ",
"fun ",
returnTypeGenerics,
getGeneratedName(),
"(handler: io.jooby.kt.HandlerContext): ",
returnTypeString,
" {"));
buffer.add(statement(indent(2), "val ctx = handler.ctx"));
} else {
buffer.add(
statement(
"fun ",
returnTypeGenerics,
getGeneratedName(),
"(ctx: io.jooby.Context): ",
returnTypeString,
" {"));
}
} else {
buffer.add(
statement(
"public ",
returnTypeGenerics,
returnTypeString,
" ",
getGeneratedName(),
"(io.jooby.Context ctx) ",
throwsException ? "throws Exception {" : "{"));
}
if (returnType.isVoid()) {
String statusCode;
if (annotationMap.size() == 1) {
statusCode =
annotationMap.keySet().iterator().next().getSimpleName().toString().equals("DELETE")
? "NO_CONTENT"
: "OK";
} else {
statusCode = null;
}
if (statusCode != null) {
buffer.add(
statement(
indent(2),
"ctx.setResponseCode(io.jooby.StatusCode.",
statusCode,
")",
semicolon(kt)));
} else {
if (kt) {
buffer.add(
statement(
indent(2),
"ctx.setResponseCode(if (ctx.getRoute().getMethod().equals(",
string("DELETE"),
")) io.jooby.StatusCode.NO_CONTENT else io.jooby.StatusCode.OK)"));
} else {
buffer.add(
statement(
indent(2),
"ctx.setResponseCode(ctx.getRoute().getMethod().equals(",
string("DELETE"),
") ? io.jooby.StatusCode.NO_CONTENT: io.jooby.StatusCode.OK)",
semicolon(false)));
}
}
controllerVar(kt, buffer);
buffer.add(
statement(
indent(2), "c.", this.method.getSimpleName(), paramList.toString(), semicolon(kt)));
buffer.add(statement(indent(2), "return ctx.getResponseCode()", semicolon(kt)));
} else if (returnType.is("io.jooby.StatusCode")) {
controllerVar(kt, buffer);
buffer.add(
statement(
indent(2),
kt ? "val" : "var",
" statusCode = c.",
this.method.getSimpleName(),
paramList.toString(),
semicolon(kt)));
buffer.add(statement(indent(2), "ctx.setResponseCode(statusCode)", semicolon(kt)));
buffer.add(statement(indent(2), "return statusCode", semicolon(kt)));
} else {
controllerVar(kt, buffer);
var cast = getReturnType().getArgumentsString(kt, false, Set.of(TypeKind.TYPEVAR));
var kotlinNotEnoughTypeInformation = !cast.isEmpty() && kt ? "" : "";
var call =
of(
"c.",
this.method.getSimpleName(),
kotlinNotEnoughTypeInformation,
paramList.toString());
if (!cast.isEmpty()) {
call = kt ? call + " as " + returnTypeString : "(" + returnTypeString + ") " + call;
}
buffer.add(statement(indent(2), "return ", call, semicolon(kt)));
}
buffer.add(statement("}", System.lineSeparator()));
return buffer;
}
private void controllerVar(boolean kt, List buffer) {
buffer.add(
statement(indent(2), kt ? "val" : "var", " c = this.factory.apply(ctx)", semicolon(kt)));
}
public String getGeneratedName() {
return generatedName;
}
public void setGeneratedName(String generatedName) {
this.generatedName = generatedName;
}
public MvcRoute addHttpMethod(TypeElement annotation) {
var annotationMirror =
ofNullable(findAnnotationByName(this.method, annotation.getQualifiedName().toString()))
.orElseThrow(() -> new IllegalArgumentException("Annotation not found: " + annotation));
annotationMap.put(annotation, annotationMirror);
return this;
}
public MvcRouter getRouter() {
return router;
}
public List getParameters(boolean skipCoroutine) {
return parameters.stream()
.filter(type -> !skipCoroutine || !type.getType().is("kotlin.coroutines.Continuation"))
.toList();
}
public ExecutableElement getMethod() {
return method;
}
public List getRawParameterTypes(boolean skipCoroutine) {
return getParameters(skipCoroutine).stream()
.map(MvcParameter::getType)
.map(TypeDefinition::getRawType)
.map(TypeMirror::toString)
.map(it -> type(router.isKt(), it))
.toList();
}
public List getJavaMethodSignature(boolean kt) {
return getParameters(false).stream()
.map(
it -> {
var type = it.getType();
// Kotlin requires his own types for primitives
if (kt && type.isPrimitive()) {
return type(kt, type.getRawType().toString());
}
return type.getRawType().toString();
})
.map(it -> it + clazz(kt))
.toList();
}
public String getMethodName() {
return getMethod().getSimpleName().toString();
}
@Override
public int hashCode() {
return method.toString().hashCode();
}
@Override
public boolean equals(Object obj) {
if (obj instanceof MvcRoute that) {
return this.method.toString().equals(that.method.toString());
}
return false;
}
@Override
public String toString() {
StringBuilder buffer = new StringBuilder();
for (var e : annotationMap.entrySet()) {
var attributes = e.getValue().getElementValues();
buffer.append("@").append(e.getKey().getSimpleName()).append("(");
if (attributes.size() == 1) {
buffer.append(attributes.values().iterator().next().getValue());
} else {
buffer.append(attributes);
}
buffer.append(") ");
}
buffer
.append(method.getSimpleName())
.append("(")
.append(String.join(", ", getRawParameterTypes(true)))
.append("): ")
.append(getReturnType());
return buffer.toString();
}
private Optional dispatch() {
var dispatch = dispatch(method);
return dispatch.isEmpty() ? dispatch(router.getTargetType()) : dispatch;
}
private Optional dispatch(Element element) {
return ofNullable(findAnnotationByName(element, "io.jooby.annotation.Dispatch"))
.map(it -> findAnnotationValue(it, VALUE).stream().findFirst().orElse("worker"));
}
private Optional mediaType(Function> lookup) {
var scopes = List.of(method, router.getTargetType());
var i = 0;
var types = Collections.emptyList();
while (types.isEmpty() && i < scopes.size()) {
types = lookup.apply(scopes.get(i++));
}
if (types.isEmpty()) {
return Optional.empty();
}
return Optional.of(
types.stream()
.map(type -> CodeBlock.of("io.jooby.MediaType.valueOf(", string(type), ")"))
.collect(Collectors.joining(", ", "java.util.List.of(", ")")));
}
/**
* Kotlin suspend function has a kotlin.coroutines.Continuation as last parameter.
*
* @return True for Kotlin suspend function.
*/
public boolean isSuspendFun() {
return suspendFun;
}
private String javadocComment(boolean kt) {
if (kt) {
return CodeBlock.statement(
"/** See [", router.getTargetType().getSimpleName(), ".", getMethodName(), "]", " */");
}
return CodeBlock.statement(
"/** See {@link ",
router.getTargetType().getSimpleName(),
"#",
getMethodName(),
"(",
String.join(", ", getRawParameterTypes(true)),
") */");
}
}
