com.expediagroup.rhapsody.util.Instantiation Maven / Gradle / Ivy
/**
* Copyright 2019 Expedia, Inc.
*
* 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 com.expediagroup.rhapsody.util;
import java.lang.reflect.Constructor;
import java.lang.reflect.Modifier;
import java.util.Arrays;
import java.util.Collection;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;
public final class Instantiation {
private Instantiation() {
}
public static T one(String qualifiedName, Object... parameters) {
return one(TypeResolution.classForQualifiedName(qualifiedName), parameters);
}
public static T one(Class clazz, Object... parameters) {
try {
List> parameterTypes = Arrays.stream(parameters).map(Instantiation::deduceParameterClass).collect(Collectors.toList());
Constructor constructor = clazz.getDeclaredConstructor(parameterTypes.toArray(new Class[parameterTypes.size()]));
ensureConstructorAccessibility(constructor);
return constructor.newInstance(parameters);
} catch (Exception e) {
throw new IllegalArgumentException("Could not instantiate instance of Class: " + clazz, e);
}
}
private static Class deduceParameterClass(Object parameter) {
if (parameter instanceof Collection) {
return Collection.class;
} else {
return parameter instanceof Map ? Map.class : parameter.getClass();
}
}
private static void ensureConstructorAccessibility(Constructor constructor) {
if (!Modifier.isPublic(constructor.getModifiers()) && !constructor.isAccessible()) {
constructor.setAccessible(true);
}
}
}