112 lines
4.4 KiB
Java
112 lines
4.4 KiB
Java
/*
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* Copyright (C) 2017 The Dagger Authors.
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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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*/
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package dagger.android.support;
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import static android.util.Log.DEBUG;
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import static dagger.internal.Preconditions.checkNotNull;
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import android.app.Activity;
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import android.app.Application;
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import android.support.v4.app.Fragment;
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import android.util.Log;
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import dagger.android.AndroidInjector;
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import dagger.android.HasAndroidInjector;
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import dagger.internal.Beta;
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/** Injects core Android types from support libraries. */
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@Beta
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public final class AndroidSupportInjection {
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private static final String TAG = "dagger.android.support";
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/**
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* Injects {@code fragment} if an associated {@link AndroidInjector} implementation can be found,
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* otherwise throws an {@link IllegalArgumentException}.
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*
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* <p>Uses the following algorithm to find the appropriate {@link AndroidInjector} to use to
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* inject {@code fragment}:
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*
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* <ol>
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* <li>Walks the parent-fragment hierarchy to find a fragment that implements {@link
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* HasAndroidInjector} or {@link HasSupportFragmentInjector}, and if none do
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* <li>Uses the {@code fragment}'s {@link Fragment#getActivity() activity} if it implements
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* {@link HasAndroidInjector} or {@link HasSupportFragmentInjector}, and if not
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* <li>Uses the {@link android.app.Application} if it implements {@link HasAndroidInjector}
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* {@link HasSupportFragmentInjector}.
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* </ol>
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*
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* If none of them implement {@link HasAndroidInjector} or {@link HasSupportFragmentInjector}, a
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* {@link IllegalArgumentException} is thrown.
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*
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* @throws IllegalArgumentException if no parent fragment, activity, or application implements
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* {@link HasAndroidInjector} or {@link HasSupportFragmentInjector}.
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*/
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public static void inject(Fragment fragment) {
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checkNotNull(fragment, "fragment");
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Object hasInjector = findHasSupportFragmentInjector(fragment);
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AndroidInjector<? super Fragment> injector;
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if (hasInjector instanceof HasAndroidInjector) {
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injector = ((HasAndroidInjector) hasInjector).androidInjector();
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checkNotNull(injector, "%s.androidInjector() returned null", hasInjector.getClass());
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} else if (hasInjector instanceof HasSupportFragmentInjector) {
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injector = ((HasSupportFragmentInjector) hasInjector).supportFragmentInjector();
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checkNotNull(injector, "%s.supportFragmentInjector() returned null", hasInjector.getClass());
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} else {
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throw new RuntimeException(
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String.format(
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"%s does not implement %s or %s",
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hasInjector.getClass().getCanonicalName(),
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HasAndroidInjector.class.getCanonicalName(),
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HasSupportFragmentInjector.class.getCanonicalName()));
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}
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if (Log.isLoggable(TAG, DEBUG)) {
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Log.d(
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TAG,
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String.format(
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"An injector for %s was found in %s",
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fragment.getClass().getCanonicalName(),
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hasInjector.getClass().getCanonicalName()));
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}
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injector.inject(fragment);
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}
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private static Object findHasSupportFragmentInjector(Fragment fragment) {
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Fragment parentFragment = fragment;
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while ((parentFragment = parentFragment.getParentFragment()) != null) {
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if (parentFragment instanceof HasAndroidInjector
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|| parentFragment instanceof HasSupportFragmentInjector) {
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return parentFragment;
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}
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}
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Activity activity = fragment.getActivity();
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if (activity instanceof HasAndroidInjector || activity instanceof HasSupportFragmentInjector) {
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return activity;
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}
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Application application = activity.getApplication();
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if (application instanceof HasAndroidInjector
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|| application instanceof HasSupportFragmentInjector) {
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return application;
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}
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throw new IllegalArgumentException(
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String.format("No injector was found for %s", fragment.getClass().getCanonicalName()));
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}
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private AndroidSupportInjection() {}
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}
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