Teeny json suport

pom.xml

@@ -71,6 +71,12 @@
       <version>4.5.14</version>
       <scope>test</scope>
     </dependency>
+    <dependency>
+      <groupId>com.google.code.gson</groupId>
+      <artifactId>gson</artifactId>
+      <version>2.10.1</version>
+      <scope>test</scope>
+    </dependency>
   </dependencies>
 
   <build>

src/main/java/module-info.java

@@ -1,4 +1,6 @@
 module net.jonathangiles.tools.teenyhttpd {
     exports net.jonathangiles.tools.teenyhttpd;
     exports net.jonathangiles.tools.teenyhttpd.model;
+
+    requires java.logging;
 }

src/main/java/net/jonathangiles/tools/teenyhttpd/implementation/ParameterType.java

@@ -0,0 +1,20 @@
+package net.jonathangiles.tools.teenyhttpd.implementation;
+
+public final class ParameterType {
+
+    private final Class<?> type;
+    private final Class<?> parentType;//nullable
+
+    ParameterType(Class<?> type, Class<?> parentType) {
+        this.type = type;
+        this.parentType = parentType;
+    }
+
+    public Class<?> getType() {
+        return type;
+    }
+
+    public Class<?> getParentType() {
+        return parentType;
+    }
+}

src/main/java/net/jonathangiles/tools/teenyhttpd/implementation/ReflectionUtils.java

@@ -0,0 +1,60 @@
+package net.jonathangiles.tools.teenyhttpd.implementation;
+
+import java.lang.reflect.*;
+import java.util.Arrays;
+
+public final class ReflectionUtils {
+
+    @SuppressWarnings("unchecked")
+    public static <T> T newInstance(Class<T> clazz) {
+
+        Constructor<?> constructor = Arrays.stream(clazz.getDeclaredConstructors())
+                .filter(cons -> cons.getParameterCount() == 0)
+                .findFirst()
+                .orElseThrow(() -> new IllegalArgumentException("No default constructor found for " + clazz.getName()));
+
+        try {
+
+            constructor.setAccessible(true);
+
+            return (T) constructor.newInstance();
+        } catch (InstantiationException | IllegalAccessException | InvocationTargetException e) {
+            throw new IllegalArgumentException("Failed to create new instance of " + clazz.getName(), e);
+        }
+    }
+
+    public static ParameterType getParameterType(Parameter parameter) {
+        return getParameterType(parameter.getParameterizedType());
+    }
+
+    public static ParameterType getParameterType(Field field) {
+        return getParameterType(field.getGenericType());
+    }
+
+    public static ParameterType getParameterType(Type type) {
+        if (type instanceof Class<?>) {
+            return null;
+        }
+
+        Type actualTypeArgument = ((ParameterizedType) type)
+                .getActualTypeArguments()[0];
+
+        if (actualTypeArgument instanceof Class<?>) {
+
+            Class<?> c = (Class<?>) actualTypeArgument;
+
+            return new ParameterType(c, null);
+        }
+
+        if (actualTypeArgument instanceof ParameterizedType) {
+
+            ParameterizedType parameterizedType = (ParameterizedType) actualTypeArgument;
+
+            return new ParameterType((Class<?>) parameterizedType.getActualTypeArguments()[0],
+                    (Class<?>) parameterizedType.getRawType());
+        }
+
+        throw new IllegalStateException("Unknown type: " + actualTypeArgument);
+    }
+
+}

src/main/java/net/jonathangiles/tools/teenyhttpd/json/JsonAlias.java

@@ -0,0 +1,12 @@
+package net.jonathangiles.tools.teenyhttpd.json;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+@Retention(RetentionPolicy.RUNTIME)
+@Target(ElementType.METHOD)
+public @interface JsonAlias {
+    String value();
+}

src/main/java/net/jonathangiles/tools/teenyhttpd/json/JsonIgnore.java

@@ -0,0 +1,11 @@
+package net.jonathangiles.tools.teenyhttpd.json;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+@Retention(RetentionPolicy.RUNTIME)
+@Target(ElementType.METHOD)
+public @interface JsonIgnore {
+}

src/main/java/net/jonathangiles/tools/teenyhttpd/json/JsonIncludeNonNull.java

@@ -0,0 +1,12 @@
+package net.jonathangiles.tools.teenyhttpd.json;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+@Retention(RetentionPolicy.RUNTIME)
+@Target(ElementType.TYPE)
+public @interface JsonIncludeNonNull {
+
+}