Add jsonReader and jsonWriter functions for constructing readers and writers for case classes

src/main/boilerplate/spray/json/ProductFormatsInstances.scala.template

@@ -24,18 +24,11 @@ trait ProductFormatsInstances { self: ProductFormats with StandardFormats =>
     jsonFormat(construct, [#p1#])
   }
   def jsonFormat[[#P1 :JF#], T <: Product](construct: ([#P1#]) => T, [#fieldName1: String#]): RootJsonFormat[T] = new RootJsonFormat[T]{
-    def write(p: T) = {
-      val fields = new collection.mutable.ListBuffer[(String, JsValue)]
-      fields.sizeHint(1 * 2)
-      [#fields ++= productElement##2Field[P1](fieldName1, p, 0)#
-      ]
-      JsObject(fields: _*)
-    }
-    def read(value: JsValue) = {
-      [#val p1V = fromField[P1](value, fieldName1)#
-      ]
-      construct([#p1V#])
-    }
+    val writer = jsonWriter(construct, [#fieldName1: String#])
+    val reader = jsonReader(construct, [#fieldName1: String#])
+
+    def write(p: T) = writer.write(p)
+    def read(value: JsValue) = reader.read(value)
   }#
 
 

src/main/boilerplate/spray/json/ProductReadersInstances.scala.template

@@ -0,0 +1,36 @@
+/*
+ * Copyright (C) 2011,2012 Mathias Doenitz, Johannes Rudolph
+ *
+ * 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 spray.json
+
+trait ProductReadersInstances { self: ProductFormats with StandardFormats =>
+[#  // Case classes with 1 parameters
+
+  def jsonReader1[[#P1 :JsonReader#], T <: Product :ClassManifest](construct: ([#P1#]) => T): RootJsonReader[T] = {
+    val Array([#p1#]) = extractFieldNames(classManifest[T])
+    jsonReader(construct, [#p1#])
+  }
+  def jsonReader[[#P1 :JsonReader#], T <: Product](construct: ([#P1#]) => T, [#fieldName1: String#]): RootJsonReader[T] = new RootJsonReader[T]{
+    def read(value: JsValue) = {
+      [#val p1V = fromField[P1](value, fieldName1)#
+      ]
+      construct([#p1V#])
+    }
+  }#
+
+
+]
+}

src/main/boilerplate/spray/json/ProductWritersInstances.scala.template

@@ -0,0 +1,38 @@
+/*
+ * Copyright (C) 2011,2012 Mathias Doenitz, Johannes Rudolph
+ *
+ * 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 spray.json
+
+trait ProductWritersInstances { self: ProductFormats with StandardFormats =>
+[#  // Case classes with 1 parameters
+
+  def jsonWriter1[[#P1 :JsonWriter#], T <: Product :ClassManifest](construct: ([#P1#]) => T): RootJsonWriter[T] = {
+    val Array([#p1#]) = extractFieldNames(classManifest[T])
+    jsonWriter(construct, [#p1#])
+  }
+  def jsonWriter[[#P1 :JsonWriter#], T <: Product](construct: ([#P1#]) => T, [#fieldName1: String#]): RootJsonWriter[T] = new RootJsonWriter[T]{
+    def write(p: T) = {
+      val fields = new collection.mutable.ListBuffer[(String, JsValue)]
+      fields.sizeHint(1 * 2)
+      [#fields ++= productElement##2Field[P1](fieldName1, p, 0)#
+      ]
+      JsObject(fields: _*)
+    }
+  }#
+
+
+]
+}

src/main/scala/spray/json/ProductFormats.scala

@@ -24,7 +24,7 @@ import scala.util.control.NonFatal
  * Provides the helpers for constructing custom JsonFormat implementations for types implementing the Product trait
  * (especially case classes)
  */
-trait ProductFormats extends ProductFormatsInstances {
+trait ProductFormats extends ProductFormatsInstances with ProductWritersInstances with ProductReadersInstances {
   this: StandardFormats =>
 
   def jsonFormat0[T](construct: () => T): RootJsonFormat[T] =

src/test/scala/spray/json/AdditionalFormatsSpec.scala

@@ -26,7 +26,7 @@ class AdditionalFormatsSpec extends Specification {
     implicit def containerReader[T :JsonFormat] = lift {
       new JsonReader[Container[T]] {
         def read(value: JsValue) = value match {
-          case JsObject(fields) if fields.contains("content") => Container(Some(jsonReader[T].read(fields("content"))))
+          case JsObject(fields) if fields.contains("content") => Container(Some(spray.json.jsonReader[T].read(fields("content"))))
           case _ => deserializationError("Unexpected format: " + value.toString)
         }
       }