/**
    *
    * Licensed to the Apache Software Foundation (ASF) under one
    * or more contributor license agreements.  See the NOTICE file
    * distributed with this work for additional information
    * regarding copyright ownership.  The ASF licenses this file
    * to you 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 org.apache.hadoop.hbase.util;
  
  import java.lang.reflect.Constructor;
  import java.lang.reflect.InvocationTargetException;
  
  import org.apache.hadoop.hbase.classification.InterfaceAudience;
  
  @InterfaceAudience.Private
  public class ReflectionUtils {
    @SuppressWarnings("unchecked")
    public static <T> T instantiateWithCustomCtor(String className,
        Class<? >[] ctorArgTypes, Object[] ctorArgs) {
      try {
        Class<? extends T> resultType = (Class<? extends T>) Class.forName(className);
        Constructor<? extends T> ctor = resultType.getDeclaredConstructor(ctorArgTypes);
        return instantiate(className, ctor, ctorArgs);
      } catch (ClassNotFoundException e) {
        throw new UnsupportedOperationException(
            "Unable to find " + className, e);
      } catch (NoSuchMethodException e) {
        throw new UnsupportedOperationException(
            "Unable to find suitable constructor for class " + className, e);
      }
    }
  
    private static <T> T instantiate(final String className, Constructor<T> ctor, Object[] ctorArgs) {
      try {
        return ctor.newInstance(ctorArgs);
      } catch (IllegalAccessException e) {
        throw new UnsupportedOperationException(
            "Unable to access specified class " + className, e);
      } catch (InstantiationException e) {
        throw new UnsupportedOperationException(
            "Unable to instantiate specified class " + className, e);
      } catch (InvocationTargetException e) {
        throw new UnsupportedOperationException(
            "Constructor threw an exception for " + className, e);
      }
    }
  
    @SuppressWarnings("unchecked")
    public static <T> T newInstance(Class<T> type, Object... params) {
      return instantiate(type.getName(), findConstructor(type, params), params);
    }
  
    @SuppressWarnings("unchecked")
    public static <T> Constructor<T> findConstructor(Class<T> type, Object... paramTypes) {
      Constructor<T>[] constructors = (Constructor<T>[])type.getConstructors();
      for (Constructor<T> ctor : constructors) {
        Class<?>[] ctorParamTypes = ctor.getParameterTypes();
        if (ctorParamTypes.length != paramTypes.length) {
          continue;
        }
  
        boolean match = true;
        for (int i = 0; i < ctorParamTypes.length && match; ++i) {
          Class<?> paramType = paramTypes[i].getClass();
          match = (!ctorParamTypes[i].isPrimitive()) ? ctorParamTypes[i].isAssignableFrom(paramType) :
                    ((int.class.equals(ctorParamTypes[i]) && Integer.class.equals(paramType)) ||
                     (long.class.equals(ctorParamTypes[i]) && Long.class.equals(paramType)) ||
                     (char.class.equals(ctorParamTypes[i]) && Character.class.equals(paramType)) ||
                     (short.class.equals(ctorParamTypes[i]) && Short.class.equals(paramType)) ||
                     (boolean.class.equals(ctorParamTypes[i]) && Boolean.class.equals(paramType)) ||
                     (byte.class.equals(ctorParamTypes[i]) && Byte.class.equals(paramType)));
        }
  
        if (match) {
          return ctor;
        }
      }
      throw new UnsupportedOperationException(
        "Unable to find suitable constructor for class " + type.getName());
    }
  }