From b70a6ac5dd61a0f6eb86118df64dbaf4ae435782 Mon Sep 17 00:00:00 2001
From: gjoranv <gjoranv@gmail.com>
Date: Thu, 8 Jun 2017 14:35:40 +0200
Subject: Revert "Revert "Gjoranv/remove default ctor4""

---
 .../com/yahoo/vespa/model/InstanceResolver.java    | 60 ++++------------------
 1 file changed, 11 insertions(+), 49 deletions(-)

(limited to 'config-model')

diff --git a/config-model/src/main/java/com/yahoo/vespa/model/InstanceResolver.java b/config-model/src/main/java/com/yahoo/vespa/model/InstanceResolver.java
index 9c761e425a7..fdb9fdf9796 100644
--- a/config-model/src/main/java/com/yahoo/vespa/model/InstanceResolver.java
+++ b/config-model/src/main/java/com/yahoo/vespa/model/InstanceResolver.java
@@ -11,6 +11,7 @@ import com.yahoo.vespa.config.buildergen.ConfigDefinition;
 import com.yahoo.yolean.Exceptions;
 import com.yahoo.vespa.config.*;
 
+import java.lang.reflect.Constructor;
 import java.lang.reflect.Field;
 import java.lang.reflect.Method;
 import java.util.List;
@@ -46,13 +47,19 @@ class InstanceResolver {
      * @param targetDef the def to use
      * @return the config instance or null of no producer for this found in model
      */
+    @SuppressWarnings("unchecked")
     static ConfigInstance resolveToInstance(ConfigKey<?> key, ConfigBuilder builder, InnerCNode targetDef) {
-        ConfigDefinitionKey defKey = new ConfigDefinitionKey(key);
         try {
             if (targetDef != null) applyDef(builder, targetDef);
-            ConfigInstance instance = getInstance(defKey, builder.getClass().getClassLoader());
-            Class<? extends ConfigInstance> clazz = instance.getClass();
-            return clazz.getConstructor(new Class<?>[]{builder.getClass()}).newInstance(builder);
+            Class<?> clazz = builder.getClass().getEnclosingClass();
+            if (!(ConfigInstance.class.isAssignableFrom(clazz))) {
+                throw new ConfigurationRuntimeException("Cannot produce config for the name '" + key.getName() + ", as "
+                                                                + clazz.getName() + " is not a ConfigInstance.");
+            }
+            Class<? extends ConfigInstance> configClass = (Class<? extends ConfigInstance>)clazz;
+            Constructor<? extends ConfigInstance> constructor = configClass.getDeclaredConstructor(builder.getClass(), boolean.class);
+            constructor.setAccessible(true);
+            return constructor.newInstance(builder, /*throwIfUninitialized*/ false);
         } catch (Exception e) {
             throw new ConfigurationRuntimeException(e);
         }
@@ -143,51 +150,6 @@ class InstanceResolver {
         }
     }
 
-    /**
-     * Create a ConfigBuilder given a definition key and a payload
-     * @param key The key to use to create the correct builder.
-     * @param payload The payload to populate the builder with.
-     * @return A ConfigBuilder initialized with payload.
-     */
-    static ConfigBuilder createBuilderFromPayload(ConfigDefinitionKey key, VespaModel model, ConfigPayload payload, ConfigDefinition targetDef) {
-        ConfigBuilder builderInstance = model.createBuilder(key, targetDef);
-        if (builderInstance == null || builderInstance instanceof GenericConfig.GenericConfigBuilder) {
-            if (log.isLoggable(LogLevel.SPAM)) {
-                log.log(LogLevel.SPAM, "Creating generic builder for key=" + key);
-            }
-            return new GenericConfig.GenericConfigBuilder(key, new ConfigPayloadBuilder(payload));
-        }
-        ConfigTransformer transformer = new ConfigTransformer(builderInstance.getClass().getDeclaringClass());
-        return transformer.toConfigBuilder(payload);
-    }
-
-    /**
-     * Returns a {@link ConfigInstance} of right type for given key using reflection
-     *
-     * @param  cKey a ConfigKey
-     * @return a {@link ConfigInstance} or null if not available in classpath
-     */
-    static ConfigInstance getInstance(ConfigDefinitionKey cKey, ClassLoader instanceLoader) {
-        String className = ConfigGenerator.createClassName(cKey.getName());
-        Class<?> clazz;
-        String fullClassName = packageName(cKey) + "." + className;
-        try {
-            clazz = instanceLoader != null ? instanceLoader.loadClass(fullClassName) : Class.forName(fullClassName);
-        } catch (ClassNotFoundException e) {
-            return null;
-        }
-        Object i;
-        try {
-            i = clazz.newInstance();
-        } catch (InstantiationException | IllegalAccessException e) {
-            throw new ConfigurationRuntimeException(e);
-        }
-        if (!(i instanceof ConfigInstance)) {
-            throw new ConfigurationRuntimeException(fullClassName + " is not a ConfigInstance, can not produce config for the name '" + cKey.getName() + "'.");
-        }
-        return (ConfigInstance) i;
-    }
-
     static String packageName(ConfigDefinitionKey cKey) {
         String prefix = "com.yahoo.";
         return prefix + (cKey.getNamespace().isEmpty() ? CNode.DEFAULT_NAMESPACE : cKey.getNamespace());
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