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GithubViewModelFactory.java
/* * Copyright (C) 2017 The Android Open Source Project * * 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.android.example.github.viewmodel; import android.arch.lifecycle.ViewModel; import android.arch.lifecycle.ViewModelProvider; import java.util.Map; import javax.inject.Inject; import javax.inject.Provider; import javax.inject.Singleton; @Singleton public class GithubViewModelFactory implements ViewModelProvider.Factory { private final Map
, Provider
> creators; @Inject public GithubViewModelFactory(Map
, Provider
> creators) { this.creators = creators; } @SuppressWarnings("unchecked") @Override public
T create(Class
modelClass) { Provider extends ViewModel> creator = creators.get(modelClass); if (creator == null) { for (Map.Entry
, Provider
> entry : creators.entrySet()) { if (modelClass.isAssignableFrom(entry.getKey())) { creator = entry.getValue(); break; } } } if (creator == null) { throw new IllegalArgumentException("unknown model class " + modelClass); } try { return (T) creator.get(); } catch (Exception e) { throw new RuntimeException(e); } } }