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Mybatis通用Mapper扩展 - weekend

There is a newer version: 5.0.0

/*
 * The MIT License (MIT)
 *
 * Copyright (c) 2014-2017 the original author or authors.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 */

package tk.mybatis.mapper.weekend.reflection;

import tk.mybatis.mapper.weekend.Fn;

import java.beans.Introspector;
import java.lang.invoke.SerializedLambda;
import java.lang.reflect.Method;
import java.util.regex.Pattern;

/**
 * @author Frank
 */
public class Reflections {
    private static final Pattern GET_PATTERN = Pattern.compile("^get[A-Z].*");
    private static final Pattern IS_PATTERN  = Pattern.compile("^is[A-Z].*");

    private Reflections() {
    }

    public static String fnToFieldName(Fn fn) {
        try {
            Method method = fn.getClass().getDeclaredMethod("writeReplace");
            method.setAccessible(Boolean.TRUE);
            SerializedLambda serializedLambda = (SerializedLambda) method.invoke(fn);
            String getter = serializedLambda.getImplMethodName();
            if (GET_PATTERN.matcher(getter).matches()) {
                getter = getter.substring(3);
            } else if (IS_PATTERN.matcher(getter).matches()) {
                getter = getter.substring(2);
            }
            return Introspector.decapitalize(getter);
        } catch (ReflectiveOperationException e) {
            throw new ReflectionOperationException(e);
        }
    }
}