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/*
* Copyright (C) 2007 Google Inc.
*
* 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.google.inject.util;
import static com.google.common.base.Preconditions.checkNotNull;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.Sets;
import com.google.inject.Inject;
import com.google.inject.Injector;
import com.google.inject.Provider;
import com.google.inject.spi.Dependency;
import com.google.inject.spi.InjectionPoint;
import com.google.inject.spi.ProviderWithDependencies;
import java.util.Set;
/**
* Static utility methods for creating and working with instances of
* {@link Provider}.
*
* @author Kevin Bourrillion (kevinb9n@gmail.com)
* @since 2.0
*/
public final class Providers {
private Providers() {}
/**
* Returns a provider which always provides {@code instance}. This should not
* be necessary to use in your application, but is helpful for several types
* of unit tests.
*
* @param instance the instance that should always be provided. This is also
* permitted to be null, to enable aggressive testing, although in real
* life a Guice-supplied Provider will never return null.
*/
public static <T> Provider<T> of(final T instance) {
return new Provider<T>() {
public T get() {
return instance;
}
@Override public String toString() {
return "of(" + instance + ")";
}
};
}
/**
* Returns a Guice-friendly {@code com.google.inject.Provider} for the given
* JSR-330 {@code javax.inject.Provider}. The converse method is unnecessary,
* since Guice providers directly implement the JSR-330 interface.
*
* @since 3.0
*/
public static <T> Provider<T> guicify(javax.inject.Provider<T> provider) {
if (provider instanceof Provider) {
return (Provider<T>) provider;
}
final javax.inject.Provider<T> delegate = checkNotNull(provider, "provider");
// Ensure that we inject all injection points from the delegate provider.
Set<InjectionPoint> injectionPoints =
InjectionPoint.forInstanceMethodsAndFields(provider.getClass());
if(injectionPoints.isEmpty()) {
return new Provider<T>() {
public T get() {
return delegate.get();
}
@Override public String toString() {
return "guicified(" + delegate + ")";
}
};
} else {
Set<Dependency<?>> mutableDeps = Sets.newHashSet();
for(InjectionPoint ip : injectionPoints) {
mutableDeps.addAll(ip.getDependencies());
}
final Set<Dependency<?>> dependencies = ImmutableSet.copyOf(mutableDeps);
return new ProviderWithDependencies<T>() {
@SuppressWarnings("unused")
@Inject
void initialize(Injector injector) {
injector.injectMembers(delegate);
}
public Set<Dependency<?>> getDependencies() {
return dependencies;
}
public T get() {
return delegate.get();
}
@Override public String toString() {
return "guicified(" + delegate + ")";
}
};
}
}
}
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