package com.hotent.base.cache.support;

import java.lang.reflect.Method;

/**
 * Simple key generator. Returns the parameter itself if a single non-null value
 * is given, otherwise returns a {@link SimpleKey} of the parameters.
 * <p>Unlike DefaultKeyGenerator, no collisions will occur with the keys
 * generated by this class. The returned {@link SimpleKey} object can be safely
 * used with a {@link org.springframework.cache.concurrent.ConcurrentMapCache},
 * however, might not be suitable for all {@link org.springframework.cache.Cache}
 * implementations.
 *
 * @company 广州宏天软件股份有限公司
 * @author heyifan
 * @email heyf@jee-soft.cn
 * @date 2020年6月16日
 */
public class SimpleKeyGenerator implements KeyGenerator {

    @Override
    public Object generate(Object target, Method method, Object... params) {
        return generateKey(params);
    }

    /**
     * Generate a key based on the specified parameters.
     *
     * @param params params
     * @return Object
     */
    public static Object generateKey(Object... params) {
        if (params.length == 0) {
            return SimpleKey.EMPTY;
        }
        if (params.length == 1) {
            Object param = params[0];
            if (param != null && !param.getClass().isArray()) {
                return param;
            }
        }
        return new SimpleKey(params);
    }

}
