io.micronaut.context.ProviderFactory Maven / Gradle / Ivy
/*
* Copyright 2017-2021 original authors
*
* 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
*
* https://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 io.micronaut.context;
import io.micronaut.core.annotation.Internal;
import io.micronaut.core.annotation.NonNull;
import java.util.HashMap;
import java.util.Map;
import java.util.Optional;
import java.util.Set;
import java.util.function.Function;
import java.util.function.Supplier;
/**
* Utility class to convert provider instances to the
* requested provider type.
*
* Internal usage only.
*
* @author James Kleeh
* @since 2.4.0
*/
@Internal
public class ProviderFactory {
private static Map, ?>> providers = new HashMap<>(3);
static {
try {
providers.put(javax.inject.Provider.class, supplier -> (javax.inject.Provider) supplier::get);
} catch (NoClassDefFoundError e) {
}
try {
providers.put(jakarta.inject.Provider.class, supplier -> (jakarta.inject.Provider) supplier::get);
} catch (NoClassDefFoundError e) {
}
}
/**
* Creates a provider of the requested type.
*
* @param providerType The provider type class
* @param beanProvider The bean provider
* @param The provider type
* @return An optional provider
*/
@NonNull
public static
Optional
createProvider(Class
providerType, @NonNull BeanProvider beanProvider) {
if (providerType == BeanProvider.class) {
return Optional.of((P) beanProvider);
}
Function, ?> function = providers.get(providerType);
if (function != null) {
return Optional.ofNullable((P) function.apply(beanProvider::get));
}
return Optional.empty();
}
/**
* @param clazz A class name
* @return True if the class equals any of the supported
* provider types
*/
public static boolean isProvider(String clazz) {
if (clazz.equals(BeanProvider.class.getName())) {
return true;
}
for (Class provider: getProviders()) {
if (provider.getName().equals(clazz)) {
return true;
}
}
return false;
}
/**
* @param clazz A class
* @return True if the class equals or extends any of the
* supported provider types
*/
public static boolean isProvider(Class clazz) {
if (BeanProvider.class.isAssignableFrom(clazz)) {
return true;
}
for (Class provider: getProviders()) {
if (provider.isAssignableFrom(clazz)) {
return true;
}
}
return false;
}
/**
* @return The set of provider types
*/
public static Set getProviders() {
return providers.keySet();
}
}