crazyboblee | abc4dd0 | 2007-02-01 01:44:36 +0000 | [diff] [blame] | 1 | /** |
| 2 | * Copyright (C) 2006 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 | */ |
crazyboblee | 235d068 | 2007-01-31 02:25:21 +0000 | [diff] [blame] | 16 | |
| 17 | package com.google.inject; |
| 18 | |
| 19 | import java.util.Arrays; |
| 20 | import java.util.Collection; |
| 21 | import java.lang.reflect.Method; |
| 22 | import java.lang.reflect.Constructor; |
| 23 | import java.lang.reflect.Field; |
| 24 | |
| 25 | /** |
| 26 | * Implements formatting. Converts known types to readable strings. |
| 27 | * |
| 28 | * @author crazybob@google.com (Bob Lee) |
| 29 | */ |
| 30 | abstract class AbstractErrorHandler implements ErrorHandler { |
| 31 | |
| 32 | public final void handle(String message, Object... arguments) { |
| 33 | for (int i = 0; i < arguments.length; i++) { |
| 34 | arguments[i] = convert(arguments[i]); |
| 35 | } |
| 36 | handle(String.format(message, arguments)); |
| 37 | } |
| 38 | |
| 39 | static Object convert(Object o) { |
| 40 | for (Converter<?> converter : converters) { |
| 41 | if (converter.appliesTo(o)) { |
| 42 | return converter.convert(o); |
| 43 | } |
| 44 | } |
| 45 | return o; |
| 46 | } |
| 47 | |
| 48 | @SuppressWarnings("unchecked") |
| 49 | static Collection<Converter<?>> converters = Arrays.asList( |
| 50 | new Converter<Method>(Method.class) { |
| 51 | public String toString(Method m) { |
| 52 | return "method " + m.getDeclaringClass().getName() + "." |
| 53 | + m.getName() + "()"; |
| 54 | } |
| 55 | }, |
| 56 | new Converter<Constructor>(Constructor.class) { |
| 57 | public String toString(Constructor c) { |
| 58 | return "constructor " + c.getDeclaringClass().getName() + "()"; |
| 59 | } |
| 60 | }, |
| 61 | new Converter<Field>(Field.class) { |
| 62 | public String toString(Field f) { |
| 63 | return "field " + f.getDeclaringClass().getName() + "." |
| 64 | + f.getName(); |
| 65 | } |
| 66 | }, |
| 67 | new Converter<Class>(Class.class) { |
| 68 | public String toString(Class c) { |
| 69 | return c.getName(); |
| 70 | } |
| 71 | }, |
| 72 | new Converter<Key>(Key.class) { |
| 73 | public String toString(Key k) { |
| 74 | return k.hasDefaultName() |
crazyboblee | 0baa9fc | 2007-01-31 02:38:54 +0000 | [diff] [blame] | 75 | ? k.getType().toString() |
| 76 | : k.getType() + " named '" + k.getName() + "'"; |
crazyboblee | 235d068 | 2007-01-31 02:25:21 +0000 | [diff] [blame] | 77 | } |
| 78 | } |
| 79 | ); |
| 80 | |
| 81 | static abstract class Converter<T> { |
| 82 | |
| 83 | final Class<T> type; |
| 84 | |
| 85 | Converter(Class<T> type) { |
| 86 | this.type = type; |
| 87 | } |
| 88 | |
| 89 | boolean appliesTo(Object o) { |
| 90 | return type.isAssignableFrom(o.getClass()); |
| 91 | } |
| 92 | |
| 93 | String convert(Object o) { |
| 94 | return toString(type.cast(o)); |
| 95 | } |
| 96 | |
| 97 | abstract String toString(T t); |
| 98 | } |
| 99 | } |