com.envimate.mapmate.validation.ThrowableRelativesLookup Maven / Gradle / Ivy
/*
* Copyright (c) 2019 envimate GmbH - https://envimate.com/.
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.envimate.mapmate.validation;
import java.util.*;
final class ThrowableRelativesLookup {
private final Class clazz;
private final List> relatives;
private ThrowableRelativesLookup(final Class clazz) {
this.clazz = clazz;
this.relatives = new ArrayList<>(0);
this.traverseRelatives(clazz);
}
Class closestRelativeFrom(final Collection> assignableClasses) {
for(final Class relative : this.relatives) {
if (assignableClasses.stream()
.anyMatch(relative::equals)) {
return relative;
}
}
return null;
}
@SuppressWarnings("unchecked")
private void traverseRelatives(final Class clazz) {
if(Throwable.class.isAssignableFrom(clazz)) {
this.relatives.add((Class) clazz);
final Class superclass = clazz.getSuperclass();
final Class[] interfaces = clazz.getInterfaces();
Arrays.stream(interfaces).forEach(this::traverseRelatives);
if(superclass != null) {
traverseRelatives(superclass);
}
}
}
static ThrowableRelativesLookup fromThrowable(final Class clazz) {
return new ThrowableRelativesLookup(clazz);
}
}