cool.linco.common.convert.FieldNameUtil Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of object-render Show documentation

a javabean render util.

The newest version!

package cool.linco.common.convert;


import java.beans.Introspector;
import java.io.Serializable;
import java.lang.invoke.SerializedLambda;
import java.lang.reflect.Method;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.function.Function;

/**
 * @author linco
 * 从传入方法获取字段名
 */
public class FieldNameUtil {

    @FunctionalInterface
    public interface SFunction extends Function, Serializable {

    }

    private static Map, String> cache = new ConcurrentHashMap<>();

    public static String getField(SFunction function) {
        return cache.computeIfAbsent(function, FieldNameUtil::findField);
    }

    private static String findField(SFunction function) {
        try {
            // 第1步 获取SerializedLambda
            Method method = function.getClass().getDeclaredMethod("writeReplace");
            method.setAccessible(Boolean.TRUE);
            SerializedLambda serializedLambda = (SerializedLambda) method.invoke(function);
            // 第2步 implMethodName 即为Field对应的Getter方法名
            String implMethodName = serializedLambda.getImplMethodName();
            if (implMethodName.startsWith("get") && implMethodName.length() > 3) {
                implMethodName = implMethodName.substring(3);
            } else if (implMethodName.startsWith("is") && implMethodName.length() > 2) {
                implMethodName = implMethodName.substring(2);
            }
            // 命名风格转换
            return Introspector.decapitalize(implMethodName);
        } catch (ReflectiveOperationException e) {
            throw new RuntimeException(e);
        }

    }
}