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c458c05801
The dark lord Gosling designed the Java package naming system so that ownership flows from the DNS system. Since we own the domain name registry.google, it seems only appropriate that we should use google.registry as our package name.
56 lines
2 KiB
Java
56 lines
2 KiB
Java
// Copyright 2016 The Domain Registry Authors. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package google.registry.tools;
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import java.lang.reflect.InvocationTargetException;
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import java.lang.reflect.Method;
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/**
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* Utilities for dependency injection using Dagger2.
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*/
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final class Injector {
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/**
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* Reflectively injects the dependencies of an object instance using Dagger2.
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*
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* <p>There must exist a method named {@code inject} on your {@code component} accepting a single
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* parameter whose type is identical to the class of {@code object}.
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*
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* <p><b>Note:</b> This is obviously slow since it uses reflection, which goes against the entire
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* philosophy of Dagger2. This method is only useful if you want to avoid avoid the boilerplate of
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* a super long chain of instanceof if statements, and you aren't concerned about performance.
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*
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* @return {@code true} if an appropriate injection method existed
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*/
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static <T> boolean injectReflectively(Class<T> componentType, T component, Object object) {
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for (Method method : componentType.getMethods()) {
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if (!method.getName().equals("inject")) {
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continue;
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}
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Class<?> type = method.getParameterTypes()[0];
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if (type == object.getClass()) {
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try {
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method.invoke(component, object);
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} catch (IllegalAccessException | IllegalArgumentException | InvocationTargetException e) {
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throw new RuntimeException(e);
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}
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return true;
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}
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}
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return false;
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}
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private Injector() {}
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}
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