| /** |
| * Copyright (C) 2008 Google Inc. |
| * |
| * Licensed 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 com.google.inject; |
| |
| import com.google.common.collect.Lists; |
| import com.google.inject.internal.Errors; |
| import com.google.inject.internal.ErrorsException; |
| import com.google.inject.internal.Keys; |
| import com.google.inject.internal.Nullability; |
| import java.lang.annotation.Annotation; |
| import java.lang.reflect.Constructor; |
| import java.lang.reflect.Member; |
| import java.lang.reflect.Method; |
| import java.lang.reflect.Type; |
| import java.util.Arrays; |
| import java.util.Iterator; |
| import java.util.List; |
| |
| /** |
| * A method or constructor parameter, plus Guice metadata. |
| * |
| * @author jessewilson@google.com (Jesse Wilson) |
| */ |
| class Parameter<T> { |
| private final int index; |
| private final Key<T> key; |
| private final boolean allowsNull; |
| |
| private Parameter(int index, Key<T> key, boolean allowsNull) { |
| this.index = index; |
| this.key = key; |
| this.allowsNull = allowsNull; |
| } |
| |
| public static <T> Parameter<T> create(int index, Key<T> key, boolean allowsNull) { |
| return new Parameter<T>(index, key, allowsNull); |
| } |
| |
| public Key<T> getKey() { |
| return key; |
| } |
| |
| public boolean allowsNull() { |
| return allowsNull; |
| } |
| |
| public int getIndex() { |
| return index; |
| } |
| |
| public static List<Parameter<?>> forMethod(Method method, Errors errors) |
| throws ErrorsException { |
| return forMember(method, method.getGenericParameterTypes(), |
| method.getParameterAnnotations(), errors); |
| } |
| |
| public static List<Parameter<?>> forConstructor(Constructor constructor, Errors errors) |
| throws ErrorsException { |
| return forMember(constructor, constructor.getGenericParameterTypes(), |
| constructor.getParameterAnnotations(), errors); |
| } |
| |
| private static List<Parameter<?>> forMember(Member member, Type[] genericParameterTypes, |
| Annotation[][] annotations, Errors errors) throws ErrorsException { |
| Iterator<Annotation[]> annotationsIterator = Arrays.asList(annotations).iterator(); |
| |
| List<Parameter<?>> parameters = Lists.newArrayList(); |
| int index = 0; |
| for (Type parameterType : genericParameterTypes) { |
| try { |
| Annotation[] parameterAnnotations = annotationsIterator.next(); |
| Key<?> key = Keys.get(parameterType, member, parameterAnnotations, errors); |
| parameters.add(create(index, key, Nullability.allowsNull(parameterAnnotations))); |
| index++; |
| } catch (ErrorsException e) { |
| errors.merge(e.getErrors()); |
| } |
| } |
| |
| errors.throwIfNecessary(); |
| return parameters; |
| } |
| } |