1 /* 2 * Copyright (C) 2008 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 17 package com.google.inject.spi; 18 19 import static com.google.common.base.Preconditions.checkNotNull; 20 21 import com.google.inject.Binder; 22 import com.google.inject.ConfigurationException; 23 import java.util.Set; 24 25 /** 26 * A request to inject the static fields and methods of a type. Requests are created explicitly in a 27 * module using {@link com.google.inject.Binder#requestStaticInjection(Class[]) 28 * requestStaticInjection()} statements: 29 * 30 * <pre> 31 * requestStaticInjection(MyLegacyService.class);</pre> 32 * 33 * @author jessewilson@google.com (Jesse Wilson) 34 * @since 2.0 35 */ 36 public final class StaticInjectionRequest implements Element { 37 private final Object source; 38 private final Class<?> type; 39 StaticInjectionRequest(Object source, Class<?> type)40 StaticInjectionRequest(Object source, Class<?> type) { 41 this.source = checkNotNull(source, "source"); 42 this.type = checkNotNull(type, "type"); 43 } 44 45 @Override getSource()46 public Object getSource() { 47 return source; 48 } 49 getType()50 public Class<?> getType() { 51 return type; 52 } 53 54 /** 55 * Returns the static methods and fields of {@code type} that will be injected to fulfill this 56 * request. 57 * 58 * @return a possibly empty set of injection points. The set has a specified iteration order. All 59 * fields are returned and then all methods. Within the fields, supertype fields are returned 60 * before subtype fields. Similarly, supertype methods are returned before subtype methods. 61 * @throws ConfigurationException if there is a malformed injection point on {@code type}, such as 62 * a field with multiple binding annotations. The exception's {@link 63 * ConfigurationException#getPartialValue() partial value} is a {@code Set<InjectionPoint>} of 64 * the valid injection points. 65 */ getInjectionPoints()66 public Set<InjectionPoint> getInjectionPoints() throws ConfigurationException { 67 return InjectionPoint.forStaticMethodsAndFields(type); 68 } 69 70 @Override applyTo(Binder binder)71 public void applyTo(Binder binder) { 72 binder.withSource(getSource()).requestStaticInjection(type); 73 } 74 75 @Override acceptVisitor(ElementVisitor<T> visitor)76 public <T> T acceptVisitor(ElementVisitor<T> visitor) { 77 return visitor.visit(this); 78 } 79 } 80