[http-client] Copy Annotations to Generated Clients (#216)

* Copy Annotations

* handle compound annotations

* Update AnnotationUtil.java

* Update AnnotationUtil.java

* Delete .factorypath

* Update AnnotationUtil.java

* Update AnnotationUtil.java

Author: SentryMan

http-generator-client/src/main/java/io/avaje/http/generator/client/AnnotationUtil.java

@@ -0,0 +1,88 @@
+package io.avaje.http.generator.client;
+
+import java.util.List;
+
+import javax.lang.model.element.AnnotationMirror;
+import javax.lang.model.element.AnnotationValue;
+import javax.lang.model.element.Element;
+import javax.lang.model.element.VariableElement;
+
+import io.avaje.http.generator.core.Append;
+import io.avaje.http.generator.core.UType;
+
+final class AnnotationUtil {
+  private AnnotationUtil() {}
+
+  public static void writeAnnotations(Append writer, Element element) {
+    for (final AnnotationMirror annotationMirror : element.getAnnotationMirrors()) {
+      final var type = UType.parse(annotationMirror.getAnnotationType().asElement().asType());
+      if (type.mainType().startsWith("io.avaje.http") || type.mainType().startsWith("io.swagger")) {
+        continue;
+      }
+      final String annotationName = annotationMirror.getAnnotationType().toString();
+      final StringBuilder sb = new StringBuilder("@").append(annotationName).append("(");
+      boolean first = true;
+
+      for (final var entry : annotationMirror.getElementValues().entrySet()) {
+        if (!first) {
+          sb.append(", ");
+        }
+        sb.append(entry.getKey().getSimpleName()).append("=");
+        writeVal(sb, entry.getValue());
+        first = false;
+      }
+
+      sb.append(")");
+      final String annotationString = sb.toString();
+      writer.append(annotationString).eol();
+    }
+  }
+
+  private static void writeVal(final StringBuilder sb, final AnnotationValue annotationValue) {
+    final var value = annotationValue.getValue();
+    // handle array values
+    if (value instanceof List) {
+      sb.append("{");
+      boolean first = true;
+
+      for (final AnnotationValue listValue : (List<AnnotationValue>) value) {
+
+        if (!first) {
+          sb.append(", ");
+        }
+
+        writeVal(sb, listValue);
+        first = false;
+      }
+      sb.append("}");
+      // Handle enum values
+    } else if (value instanceof VariableElement) {
+
+      final var element = (VariableElement) value;
+
+      final var type = UType.parse(element.asType());
+      sb.append(type.full() + "." + element.toString());
+      // handle annotation values
+    } else if (value instanceof AnnotationMirror) {
+
+      final var mirror = (AnnotationMirror) value;
+
+      final String annotationName = mirror.getAnnotationType().toString();
+      sb.append("@").append(annotationName).append("(");
+      boolean first = true;
+
+      for (final var entry : mirror.getElementValues().entrySet()) {
+        if (!first) {
+          sb.append(", ");
+        }
+        sb.append(entry.getKey().getSimpleName()).append("=");
+        writeVal(sb, entry.getValue());
+        first = false;
+      }
+
+      sb.append(")");
+    } else {
+      sb.append(annotationValue.toString());
+    }
+  }
+}

http-generator-client/src/main/java/io/avaje/http/generator/client/ClientMethodWriter.java

@@ -49,6 +49,7 @@ private void methodStart(Append writer) {
     }
     writer.append("  // %s %s", webMethod, method.webMethodPath()).eol();
     writer.append("  @Override").eol();
+    AnnotationUtil.writeAnnotations(writer, method.element());
     writer.append("  public %s%s %s(", methodGenericParams, returnType.shortType(), method.simpleName());
     int count = 0;
     for (MethodParam param : method.params()) {

http-generator-client/src/main/java/io/avaje/http/generator/client/ClientWriter.java

@@ -79,6 +79,7 @@ private void writeMethods() {
 
   private void writeClassStart() {
     writer.append(AT_GENERATED).eol();
+    AnnotationUtil.writeAnnotations(writer, reader.beanType());
     writer.append("public class %s%s implements %s {", shortName, SUFFIX, shortName).eol().eol();
 
     writer.append("  private final HttpClient client;").eol().eol();

http-generator-core/src/main/java/io/avaje/http/generator/core/MethodReader.java

@@ -423,4 +423,8 @@ public void writeContext(Append writer, String reqName, String resName) {
     }
     writer.append("(new ServerContext(%s, %s), () -> ", reqName, resName);
   }
+
+  public ExecutableElement element() {
+    return element;
+  }
 }