Squash sub package 'formats'

1 files changed, 262 insertions, 0 deletions

diff --git a/src/main/scala/cc/spray/json/GenericFormats.scala b/src/main/scala/cc/spray/json/GenericFormats.scala
new file mode 100644
index 0000000..aa1da08
--- /dev/null
+++ b/src/main/scala/cc/spray/json/GenericFormats.scala
@@ -0,0 +1,262 @@
+/*
+ * Original implementation (C) 2009-2011 Debasish Ghosh
+ * Adapted and extended in 2011 by Mathias Doenitz
+ *
+ * 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 cc.spray.json
+
+/**
+  * Provides the helpers for constructing custom JsonFormat implementations.
+ */
+trait GenericFormats {
+
+  private type JF[T] = JsonFormat[T] // simple alias for reduced verbosity
+  
+  /**
+   * Lazy wrapper around serialization. Useful when you want to serialize mutually recursive structures.
+   */
+  def lazyFormat[T](format: => JF[T]) = new JF[T]{
+    lazy val delegate = format;
+    def write(x: T) = delegate.write(x);
+    def read(value: JsValue) = delegate.read(value);
+  }
+  
+  def jsonFormat[A :JF, B :JF, T <: Product](construct: (A, B) => T, a: String, b: String) = new JF[T]{
+    def write(p: T) = JsObject(
+      JsField(a, element[A](p, 0).toJson),
+      JsField(b, element[B](p, 1).toJson)
+    )
+    def read(value: JsValue) = construct(
+      field(value, a).fromJson[A],
+      field(value, b).fromJson[B]
+    )
+  }
+
+  def jsonFormat[A :JF, B :JF, C :JF, T <: Product](construct: (A, B, C) => T,
+                                                a: String, b: String, c: String) = new JF[T]{
+    def write(p: T) = JsObject(
+      JsField(a, element[A](p, 0).toJson),
+      JsField(b, element[B](p, 1).toJson),
+      JsField(c, element[C](p, 2).toJson)
+    )
+    def read(value: JsValue) = construct(
+      field(value, a).fromJson[A],
+      field(value, b).fromJson[B],
+      field(value, c).fromJson[C]
+    )
+  }
+
+  def jsonFormat[A :JF, B :JF, C :JF, D :JF, T <: Product](construct: (A, B, C, D) => T,
+                                                       a: String, b: String, c: String, d: String) = new JF[T]{
+    def write(p: T) = JsObject(
+      JsField(a, element[A](p, 0).toJson),
+      JsField(b, element[B](p, 1).toJson),
+      JsField(c, element[C](p, 2).toJson),
+      JsField(d, element[D](p, 3).toJson)
+    )
+    def read(value: JsValue) = construct(
+      field(value, a).fromJson[A],
+      field(value, b).fromJson[B],
+      field(value, c).fromJson[C],
+      field(value, d).fromJson[D]
+    )
+  }
+
+  def jsonFormat[A :JF, B :JF, C :JF, D :JF, E :JF, T <: Product](construct: (A, B, C, D, E) => T,
+        a: String, b: String, c: String, d: String, e: String) = new JF[T]{
+    def write(p: T) = JsObject(
+      JsField(a, element[A](p, 0).toJson),
+      JsField(b, element[B](p, 1).toJson),
+      JsField(c, element[C](p, 2).toJson),
+      JsField(d, element[D](p, 3).toJson),
+      JsField(e, element[E](p, 4).toJson)
+    )
+    def read(value: JsValue) = construct(
+      field(value, a).fromJson[A],
+      field(value, b).fromJson[B],
+      field(value, c).fromJson[C],
+      field(value, d).fromJson[D],
+      field(value, e).fromJson[E]
+    )
+  }
+  
+  def jsonFormat[A :JF, B :JF, C :JF, D :JF, E :JF, F :JF, T <: Product](construct: (A, B, C, D, E, F) => T,
+        a: String, b: String, c: String, d: String, e: String, f: String) = new JF[T]{
+    def write(p: T) = JsObject(
+      JsField(a, element[A](p, 0).toJson),
+      JsField(b, element[B](p, 1).toJson),
+      JsField(c, element[C](p, 2).toJson),
+      JsField(d, element[D](p, 3).toJson),
+      JsField(e, element[E](p, 4).toJson),
+      JsField(f, element[F](p, 5).toJson)
+    )
+    def read(value: JsValue) = construct(
+      field(value, a).fromJson[A],
+      field(value, b).fromJson[B],
+      field(value, c).fromJson[C],
+      field(value, d).fromJson[D],
+      field(value, e).fromJson[E],
+      field(value, f).fromJson[F]
+    )
+  }
+  
+  def jsonFormat[A :JF, B :JF, C :JF, D :JF, E :JF, F :JF, G :JF, T <: Product](construct: (A, B, C, D, E, F, G) => T,
+        a: String, b: String, c: String, d: String, e: String, f: String, g: String) = new JF[T]{
+    def write(p: T) = JsObject(
+      JsField(a, element[A](p, 0).toJson),
+      JsField(b, element[B](p, 1).toJson),
+      JsField(c, element[C](p, 2).toJson),
+      JsField(d, element[D](p, 3).toJson),
+      JsField(e, element[E](p, 4).toJson),
+      JsField(f, element[F](p, 5).toJson),
+      JsField(g, element[G](p, 6).toJson)
+    )
+    def read(value: JsValue) = construct(
+      field(value, a).fromJson[A],
+      field(value, b).fromJson[B],
+      field(value, c).fromJson[C],
+      field(value, d).fromJson[D],
+      field(value, e).fromJson[E],
+      field(value, f).fromJson[F],
+      field(value, g).fromJson[G]
+    )
+  }
+  
+  def jsonFormat[A :JF, B :JF, C :JF, D :JF, E :JF, F :JF, G :JF, H :JF, T <: Product]
+        (construct: (A, B, C, D, E, F, G, H) => T,
+        a: String, b: String, c: String, d: String, e: String, f: String, g: String, h: String) = new JF[T]{
+    def write(p: T) = JsObject(
+      JsField(a, element[A](p, 0).toJson),
+      JsField(b, element[B](p, 1).toJson),
+      JsField(c, element[C](p, 2).toJson),
+      JsField(d, element[D](p, 3).toJson),
+      JsField(e, element[E](p, 4).toJson),
+      JsField(f, element[F](p, 5).toJson),
+      JsField(g, element[G](p, 6).toJson),
+      JsField(h, element[H](p, 7).toJson)
+    )
+    def read(value: JsValue) = construct(
+      field(value, a).fromJson[A],
+      field(value, b).fromJson[B],
+      field(value, c).fromJson[C],
+      field(value, d).fromJson[D],
+      field(value, e).fromJson[E],
+      field(value, f).fromJson[F],
+      field(value, g).fromJson[G],
+      field(value, h).fromJson[H]
+    )
+  }
+  
+  def jsonFormat[A :JF, B :JF, C :JF, D :JF, E :JF, F :JF, G :JF, H :JF, I :JF, T <: Product]
+        (construct: (A, B, C, D, E, F, G, H, I) => T,
+        a: String, b: String, c: String, d: String, e: String, f: String, g: String, h: String, i: String) = new JF[T]{
+    def write(p: T) = JsObject(
+      JsField(a, element[A](p, 0).toJson),
+      JsField(b, element[B](p, 1).toJson),
+      JsField(c, element[C](p, 2).toJson),
+      JsField(d, element[D](p, 3).toJson),
+      JsField(e, element[E](p, 4).toJson),
+      JsField(f, element[F](p, 5).toJson),
+      JsField(g, element[G](p, 6).toJson),
+      JsField(h, element[H](p, 7).toJson),
+      JsField(i, element[I](p, 8).toJson)
+    )
+    def read(value: JsValue) = construct(
+      field(value, a).fromJson[A],
+      field(value, b).fromJson[B],
+      field(value, c).fromJson[C],
+      field(value, d).fromJson[D],
+      field(value, e).fromJson[E],
+      field(value, f).fromJson[F],
+      field(value, g).fromJson[G],
+      field(value, h).fromJson[H],
+      field(value, i).fromJson[I]
+    )
+  }
+  
+  def jsonFormat[A :JF, B :JF, C :JF, D :JF, E :JF, F :JF, G :JF, H :JF, I :JF, J :JF, T <: Product]
+        (construct: (A, B, C, D, E, F, G, H, I, J) => T, a: String, b: String, c: String, d: String, e: String,
+         f: String, g: String, h: String, i: String, j: String) = new JF[T]{
+    def write(p: T) = JsObject(
+      JsField(a, element[A](p, 0).toJson),
+      JsField(b, element[B](p, 1).toJson),
+      JsField(c, element[C](p, 2).toJson),
+      JsField(d, element[D](p, 3).toJson),
+      JsField(e, element[E](p, 4).toJson),
+      JsField(f, element[F](p, 5).toJson),
+      JsField(g, element[G](p, 6).toJson),
+      JsField(h, element[H](p, 7).toJson),
+      JsField(i, element[I](p, 8).toJson),
+      JsField(j, element[J](p, 9).toJson)
+    )
+    def read(value: JsValue) = construct(
+      field(value, a).fromJson[A],
+      field(value, b).fromJson[B],
+      field(value, c).fromJson[C],
+      field(value, d).fromJson[D],
+      field(value, e).fromJson[E],
+      field(value, f).fromJson[F],
+      field(value, g).fromJson[G],
+      field(value, h).fromJson[H],
+      field(value, i).fromJson[I],
+      field(value, j).fromJson[J]
+    )
+  }
+  
+  def jsonFormat[A :JF, B :JF, C :JF, D :JF, E :JF, F :JF, G :JF, H :JF, I :JF, J :JF, K :JF, T <: Product]
+        (construct: (A, B, C, D, E, F, G, H, I, J, K) => T, a: String, b: String, c: String, d: String, e: String,
+         f: String, g: String, h: String, i: String, j: String, k: String) = new JF[T]{
+    def write(p: T) = JsObject(
+      JsField(a, element[A](p, 0).toJson),
+      JsField(b, element[B](p, 1).toJson),
+      JsField(c, element[C](p, 2).toJson),
+      JsField(d, element[D](p, 3).toJson),
+      JsField(e, element[E](p, 4).toJson),
+      JsField(f, element[F](p, 5).toJson),
+      JsField(g, element[G](p, 6).toJson),
+      JsField(h, element[H](p, 7).toJson),
+      JsField(i, element[I](p, 8).toJson),
+      JsField(j, element[J](p, 9).toJson),
+      JsField(k, element[K](p, 10).toJson)
+    )
+    def read(value: JsValue) = construct(
+      field(value, a).fromJson[A],
+      field(value, b).fromJson[B],
+      field(value, c).fromJson[C],
+      field(value, d).fromJson[D],
+      field(value, e).fromJson[E],
+      field(value, f).fromJson[F],
+      field(value, g).fromJson[G],
+      field(value, h).fromJson[H],
+      field(value, i).fromJson[I],
+      field(value, j).fromJson[J],
+      field(value, k).fromJson[K]
+    )
+  }
+
+  // helpers
+  
+  private def element[T](p: Product, ix: Int) = p.productElement(ix).asInstanceOf[T]
+  
+  private def field(value: JsValue, fieldName: String) = value match {
+    case jso: JsObject => {
+      jso.fields
+              .find(_.name == fieldName)
+              .getOrElse(throw new DeserializationException("Object is missing required member '" + fieldName + "'"))
+              .value
+    }
+    case _ => throw new DeserializationException("Object expected")
+  }
+}