/*
* 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.internal.operations;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import static org.gradle.internal.Cast.uncheckedCast;
public final class BuildOperationTypes {
private BuildOperationTypes() {
}
public static <D, R, T extends BuildOperationType<D, R>> Class<D> detailsType(Class<T> type) {
return uncheckedCast(extract(type, 0));
}
public static <D, R, T extends BuildOperationType<D, R>> Class<R> resultType(Class<T> type) {
return uncheckedCast(extract(type, 1));
}
private static <T extends BuildOperationType<?, ?>> Class<?> extract(Class<T> type, int index) {
assert BuildOperationType.class.isAssignableFrom(type) : type.getName() + " is not a " + BuildOperationType.class.getName();
for (Type superType : type.getGenericInterfaces()) {
if (superType instanceof ParameterizedType && ((ParameterizedType) superType).getRawType().equals(BuildOperationType.class)) {
ParameterizedType parameterizedSuperType = (ParameterizedType) superType;
Type typeParameter = parameterizedSuperType.getActualTypeArguments()[index];
assert typeParameter instanceof Class;
return (Class<?>) typeParameter;
}
}
throw new IllegalStateException("Failed to extract type from " + type);
}
}