org.lastaflute.doc.util.LaDocReflectionUtil Maven / Gradle / Ivy
/*
* Copyright 2014-2017 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.lastaflute.doc.util;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.lang.reflect.TypeVariable;
import java.util.function.Supplier;
/**
* @author p1us2er0
* @since 0.2.3 (2017/04/20 Thursday)
*/
public class LaDocReflectionUtil {
public static T getNoException(Supplier supplier) {
try {
return supplier.get();
} catch (Throwable t) {
return null;
}
}
// e.g. (actually FQCN)
// JsonResponse>, 1 to String
// JsonResponse>. 1 to SeaLandPiari
// JsonResponse>>, 1 to Sea
// JsonResponse>>, 1 to Map
// TODO p1us2er0 Refactor. (2017/10/13)
public static Class extractElementType(Type type, int depth) {
if (type instanceof ParameterizedType) {
Type actualType = ((ParameterizedType) type).getActualTypeArguments()[0];
if (depth == 0) {
if (actualType instanceof ParameterizedType) {
return (Class) ((ParameterizedType) actualType).getRawType();
}
if (actualType instanceof Class) {
return (Class) actualType;
}
if (actualType instanceof TypeVariable) {
return (Class) ((TypeVariable) actualType).getBounds()[0];
}
// WildcardType etc.
return Object.class;
}
return (Class) extractElementType(actualType, --depth);
}
if (depth != 0) {
throw new IllegalArgumentException("depth=" + depth);
}
return (Class) type;
}
}