From bca9548d173280f8adfd2b40896c361a5e15b5cd Mon Sep 17 00:00:00 2001
From: Idan Elhalwani <idan@elhalwani.com>
Date: Sun, 4 Sep 2022 15:29:12 +0300
Subject: [PATCH] feat: add automap option to builder

---
 .../builder/MappingDefinitionBuilder.kt       | 42 ++++++++++++++++++-
 .../builder/MappingDefinitionBuilderTests.kt  | 20 +++++++++
 2 files changed, 61 insertions(+), 1 deletion(-)

diff --git a/shapeshift/src/main/kotlin/dev/krud/shapeshift/builder/MappingDefinitionBuilder.kt b/shapeshift/src/main/kotlin/dev/krud/shapeshift/builder/MappingDefinitionBuilder.kt
index 55127ba..f2ba8a4 100644
--- a/shapeshift/src/main/kotlin/dev/krud/shapeshift/builder/MappingDefinitionBuilder.kt
+++ b/shapeshift/src/main/kotlin/dev/krud/shapeshift/builder/MappingDefinitionBuilder.kt
@@ -14,8 +14,10 @@ import dev.krud.shapeshift.MappingStrategy
 import dev.krud.shapeshift.condition.MappingCondition
 import dev.krud.shapeshift.dto.ResolvedMappedField
 import dev.krud.shapeshift.dto.TransformerCoordinates
+import dev.krud.shapeshift.enums.AutoMappingStrategy
 import dev.krud.shapeshift.resolver.MappingDefinition
 import dev.krud.shapeshift.transformer.base.MappingTransformer
+import dev.krud.shapeshift.util.getAutoMappings
 import dev.krud.shapeshift.util.getDeclaredFieldRecursive
 import java.lang.reflect.Field
 
@@ -24,6 +26,22 @@ import java.lang.reflect.Field
  */
 class MappingDefinitionBuilder(val fromClazz: Class<out Any>, val toClazz: Class<out Any>) {
     private val resolvedMappedFields = mutableListOf<ResolvedMappedField>()
+    private var autoMappingStrategy: AutoMappingStrategy = AutoMappingStrategy.NONE
+
+    /**
+     * Automatically map all fields with the given strategy
+     */
+    fun autoMap(strategy: AutoMappingStrategy): MappingDefinitionBuilder {
+        this.autoMappingStrategy = strategy
+        return this
+    }
+
+    /**
+     * Automatically map all fields with the given strategy with strategy [AutoMappingStrategy.BY_NAME_AND_TYPE]
+     */
+    fun autoMap(): MappingDefinitionBuilder {
+        return autoMap(AutoMappingStrategy.BY_NAME_AND_TYPE)
+    }
 
     /**
      * Define a new mapped field, along with an optional condition, transformer and override mapping strategy
@@ -40,10 +58,16 @@ class MappingDefinitionBuilder(val fromClazz: Class<out Any>, val toClazz: Class
      * Return a mapping definition for the fields defined in this builder
      */
     fun build(): MappingDefinition {
+        val autoMappedFields = getAutoMappings(fromClazz, toClazz, autoMappingStrategy)
+            .filter { autoResolvedMappedField ->
+                resolvedMappedFields.none {
+                    it.mapFromCoordinates.first() == autoResolvedMappedField.mapFromCoordinates.first() || it.mapToCoordinates.first() == autoResolvedMappedField.mapToCoordinates.first()
+                }
+            }
         return MappingDefinition(
             fromClazz,
             toClazz,
-            resolvedMappedFields
+            resolvedMappedFields + autoMappedFields
         )
     }
 
@@ -54,6 +78,22 @@ class MappingDefinitionBuilder(val fromClazz: Class<out Any>, val toClazz: Class
         private var transformerCoordinates: TransformerCoordinates = TransformerCoordinates.NONE
         private var mappingStrategy: MappingStrategy? = null
 
+        /**
+         * @see MappingDefinitionBuilder.autoMap
+         */
+        fun autoMap(strategy: AutoMappingStrategy): MappingDefinitionBuilder {
+            buildAndAddSelf()
+            return this@MappingDefinitionBuilder.autoMap(strategy)
+        }
+
+        /**
+         * @see MappingDefinitionBuilder.autoMap
+         */
+        fun autoMap(): MappingDefinitionBuilder {
+            buildAndAddSelf()
+            return this@MappingDefinitionBuilder.autoMap()
+        }
+
         /**
          * @see MappingDefinitionBuilder.mapField
          */
diff --git a/shapeshift/src/test/kotlin/dev/krud/shapeshift/builder/MappingDefinitionBuilderTests.kt b/shapeshift/src/test/kotlin/dev/krud/shapeshift/builder/MappingDefinitionBuilderTests.kt
index 3143e4c..1fcbccb 100644
--- a/shapeshift/src/test/kotlin/dev/krud/shapeshift/builder/MappingDefinitionBuilderTests.kt
+++ b/shapeshift/src/test/kotlin/dev/krud/shapeshift/builder/MappingDefinitionBuilderTests.kt
@@ -131,6 +131,26 @@ class MappingDefinitionBuilderTests {
         expectThat(result.profession)
             .isNull()
     }
+
+    @Test
+    internal fun `test auto mapping`() {
+        val shapeShift = ShapeShiftBuilder()
+            .excludeDefaultTransformers()
+            .withMapping(
+                MappingDefinitionBuilder(From::class.java, To::class.java)
+                    .autoMap()
+                    .build()
+            )
+            .build()
+        val original = From(profession = "Test")
+        val result = shapeShift.map<From, To>(original)
+        expectThat(result.name)
+            .isEqualTo(original.name)
+        expectThat(result.age)
+            .isEqualTo(original.age)
+        expectThat(result.profession)
+            .isEqualTo(original.profession)
+    }
 }
 
 class From(