cn.wanghaomiao.seimi.utils.GenericUtils.java Source code

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Here is the source code for cn.wanghaomiao.seimi.utils.GenericUtils.java

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/*
   Copyright 2015 Wang Haomiao<et.tw@163.com>
    
   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 cn.wanghaomiao.seimi.utils;

import cn.wanghaomiao.seimi.core.CastToNumber;
import cn.wanghaomiao.seimi.struct.Request;
import com.alibaba.fastjson.JSONObject;
import org.apache.commons.codec.digest.DigestUtils;

import java.lang.reflect.Array;
import java.lang.reflect.GenericArrayType;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.math.BigDecimal;
import java.util.Collections;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;

/**
 * ??
 */
public class GenericUtils {

    private static final Class<?>[] EMPTY_CLASSES = new Class<?>[0];
    private static final Map<Class, CastToNumber> numberClass = new HashMap<Class, CastToNumber>() {
        {
            put(int.class, new CastToNumber() {
                @Override
                public Object castTo(String ori) {
                    return new BigDecimal(ori).intValue();
                }
            });
            put(Integer.class, new CastToNumber() {
                @Override
                public Object castTo(String ori) {
                    return new BigDecimal(ori).intValue();
                }
            });
            put(long.class, new CastToNumber() {
                @Override
                public Object castTo(String ori) {
                    return new BigDecimal(ori).longValue();
                }
            });
            put(Long.class, new CastToNumber() {
                @Override
                public Object castTo(String ori) {
                    return new BigDecimal(ori).longValue();
                }
            });
            put(short.class, new CastToNumber() {
                @Override
                public Object castTo(String ori) {
                    return new BigDecimal(ori).shortValue();
                }
            });
            put(Short.class, new CastToNumber() {
                @Override
                public Object castTo(String ori) {
                    return new BigDecimal(ori).shortValue();
                }
            });
            put(float.class, new CastToNumber() {
                @Override
                public Object castTo(String ori) {
                    return new BigDecimal(ori).floatValue();
                }
            });
            put(Float.class, new CastToNumber() {
                @Override
                public Object castTo(String ori) {
                    return new BigDecimal(ori).floatValue();
                }
            });
            put(double.class, new CastToNumber() {
                @Override
                public Object castTo(String ori) {
                    return new BigDecimal(ori).doubleValue();
                }
            });
            put(Double.class, new CastToNumber() {
                @Override
                public Object castTo(String ori) {
                    return new BigDecimal(ori).doubleValue();
                }
            });
        }
    };

    /**
     * ?, , : Generic ???
     * 
     * @param genericType - Generic ?
     * @return ?
     */
    public static Class<?>[] getActualClass(Type genericType) {

        if (genericType instanceof ParameterizedType) {

            Type[] actualTypes = ((ParameterizedType) genericType).getActualTypeArguments();
            Class<?>[] actualClasses = new Class<?>[actualTypes.length];

            int i = 0;
            while (i < actualTypes.length) {
                Type actualType = actualTypes[i];
                if (actualType instanceof Class<?>) {
                    actualClasses[i] = (Class<?>) actualType;
                } else if (actualType instanceof GenericArrayType) {
                    Type componentType = ((GenericArrayType) actualType).getGenericComponentType();
                    actualClasses[i] = Array.newInstance((Class<?>) componentType, 0).getClass();
                }
                i++;
            }

            return actualClasses;
        }

        return EMPTY_CLASSES;
    }

    /**
     * ??
     * @param cls
     * @return
     */
    public static boolean isNumber(Class cls) {
        return numberClass.containsKey(cls);
    }

    public static Object castToNumber(Class cls, String val) {
        return numberClass.get(cls).castTo(val);
    }

    public static String sortParams(Map<String, String> params) {
        if (params == null) {
            return "";
        }
        JSONObject data = new JSONObject(new LinkedHashMap<String, Object>());
        List<String> keys = new LinkedList<>(params.keySet());
        Collections.sort(keys);
        for (String k : keys) {
            data.put(k, params.get(k));
        }
        return data.toJSONString();
    }

    public static String signRequest(Request request) {
        return DigestUtils.md5Hex(request.getUrl() + sortParams(request.getParams()));
    }
}