1/*
2 * Copyright (C) 2015 Google Inc.
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.google.caliper.runner;
18
19import com.google.caliper.api.ResultProcessor;
20import java.lang.reflect.Constructor;
21import java.lang.reflect.InvocationTargetException;
22
23/**
24 * Responsible for creating instances of configured {@link ResultProcessor}.
25 */
26final class ResultProcessorCreator {
27
28  public static final String NO_PUBLIC_DEFAULT_CONSTRUCTOR =
29      "ResultProcessor %s not supported as it does not have a public default constructor";
30
31  private ResultProcessorCreator() {
32  }
33
34  static ResultProcessor createResultProcessor(Class<? extends ResultProcessor> processorClass) {
35    ResultProcessor resultProcessor;
36
37    try {
38      Constructor<? extends ResultProcessor> constructor = processorClass.getConstructor();
39      resultProcessor = constructor.newInstance();
40    } catch (NoSuchMethodException e) {
41      throw new UserCodeException(String.format(NO_PUBLIC_DEFAULT_CONSTRUCTOR, processorClass), e);
42    } catch (InvocationTargetException e) {
43      throw new UserCodeException("ResultProcessor %s could not be instantiated", e.getCause());
44    } catch (InstantiationException e) {
45      throw new UserCodeException("ResultProcessor %s could not be instantiated", e);
46    } catch (IllegalAccessException e) {
47      throw new UserCodeException("ResultProcessor %s could not be instantiated", e);
48    }
49
50    return resultProcessor;
51  }
52}
53