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Gradle 6.9.1 API redistribution.
/*
* Copyright 2017 the original author or 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
*
* 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 org.gradle.util;
import org.gradle.api.provider.Provider;
import org.gradle.internal.Factory;
import javax.annotation.Nullable;
import java.util.concurrent.Callable;
import static org.gradle.util.GUtil.uncheckedCall;
public class DeferredUtil {
private static Boolean kotlinFunction0CanBeLoaded = null;
/**
* Successively unpacks a deferred value until it is resolved to null or something other than Callable (including Groovy Closure) or Kotlin lambda
* then unpacks the remaining Provider or Factory.
*/
@Nullable
public static Object unpack(@Nullable Object deferred) {
if (deferred == null) {
return null;
}
Object value = unpackNestableDeferred(deferred);
if (value instanceof Provider) {
return ((Provider>) value).get();
}
if (value instanceof Factory) {
return ((Factory>) value).create();
}
return value;
}
public static boolean isDeferred(Object value) {
return value instanceof Provider
|| value instanceof Factory
|| isNestableDeferred(value);
}
private static boolean isNestableDeferred(@Nullable Object value) {
return value instanceof Callable
|| isKotlinFunction0Deferrable(value);
}
@Nullable
private static Object unpackNestableDeferred(Object deferred) {
Object current = deferred;
while (isNestableDeferred(current)) {
if (current instanceof Callable) {
current = uncheckedCall((Callable>) current);
} else {
current = unpackKotlinFunction0(current);
}
}
return current;
}
private static boolean isKotlinFunction0Deferrable(@Nullable Object value) {
return value != null && kotlinFunction0CanBeLoaded() && value instanceof kotlin.jvm.functions.Function0;
}
private static boolean kotlinFunction0CanBeLoaded() {
if (kotlinFunction0CanBeLoaded == null) {
try {
DeferredUtil.class.getClassLoader().loadClass("kotlin.jvm.functions.Function0");
kotlinFunction0CanBeLoaded = true;
} catch (ClassNotFoundException ex) {
kotlinFunction0CanBeLoaded = false;
}
}
return kotlinFunction0CanBeLoaded;
}
@Nullable
private static Object unpackKotlinFunction0(Object value) {
assert kotlinFunction0CanBeLoaded;
return ((kotlin.jvm.functions.Function0) value).invoke();
}
}
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