org.springframework.boot.context.properties.bind.DefaultBindConstructorProvider Maven / Gradle / Ivy
/*
* Copyright 2012-2019 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
*
* https://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.springframework.boot.context.properties.bind;
import java.lang.reflect.Constructor;
import org.springframework.beans.BeanUtils;
import org.springframework.core.KotlinDetector;
/**
* Default {@link BindConstructorProvider} implementation.
*
* @author Madhura Bhave
* @author Phillip Webb
*/
class DefaultBindConstructorProvider implements BindConstructorProvider {
@Override
public Constructor getBindConstructor(Bindable bindable, boolean isNestedConstructorBinding) {
Class type = bindable.getType().resolve();
if (bindable.getValue() != null || type == null) {
return null;
}
if (KotlinDetector.isKotlinPresent() && KotlinDetector.isKotlinType(type)) {
return getDeducedKotlinConstructor(type);
}
Constructor[] constructors = type.getDeclaredConstructors();
if (constructors.length == 1 && constructors[0].getParameterCount() > 0) {
return constructors[0];
}
return null;
}
private Constructor getDeducedKotlinConstructor(Class type) {
Constructor primaryConstructor = BeanUtils.findPrimaryConstructor(type);
if (primaryConstructor != null && primaryConstructor.getParameterCount() > 0) {
return primaryConstructor;
}
return null;
}
}