71 lines
2.0 KiB
Java
71 lines
2.0 KiB
Java
/*
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* Copyright (C) 2014 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.internal;
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import static dagger.internal.Preconditions.checkNotNull;
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import javax.inject.Provider;
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/**
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* A DelegateFactory that is used to stitch Provider/Lazy indirection based dependency cycles.
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*
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* @since 2.0.1
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*/
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public final class DelegateFactory<T> implements Factory<T> {
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private Provider<T> delegate;
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@Override
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public T get() {
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if (delegate == null) {
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throw new IllegalStateException();
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}
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return delegate.get();
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}
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// TODO(ronshapiro): remove this once we can reasonably expect generated code is no longer using
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// this method
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@Deprecated
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public void setDelegatedProvider(Provider<T> delegate) {
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setDelegate(this, delegate);
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}
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/**
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* Sets {@code delegateFactory}'s delegate provider to {@code delegate}.
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*
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* <p>{@code delegateFactory} must be an instance of {@link DelegateFactory}, otherwise this
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* method will throw a {@link ClassCastException}.
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*/
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public static <T> void setDelegate(Provider<T> delegateFactory, Provider<T> delegate) {
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checkNotNull(delegate);
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DelegateFactory<T> asDelegateFactory = (DelegateFactory<T>) delegateFactory;
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if (asDelegateFactory.delegate != null) {
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throw new IllegalStateException();
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}
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asDelegateFactory.delegate = delegate;
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}
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/**
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* Returns the factory's delegate.
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*
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* @throws NullPointerException if the delegate has not been set
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*/
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Provider<T> getDelegate() {
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return checkNotNull(delegate);
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}
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}
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