zhangchuanxi / saas-common-lib

package com.irrigation.icl.utils;

import com.google.common.collect.Lists;
import com.irrigation.icl.exception.ContextRuntimeException;
import org.springframework.beans.BeanUtils;

import java.util.*;

/**
 * @author zhangchuanxi
 * 对象工具类
 * @version 1.0.1
 */
public class ObjectUtils {

    /**
     * 复制对象错误提示
     */
    private final static String COPY_OBJECT_FAIL = "复制对象失败";

    private ObjectUtils() {
    }


    /**
     * 判断对象司是否是空
     *
     * @param obj
     * @return
     */
    public static boolean isNull(Object obj) {
        return obj == null;
    }

    /**
     * 判断对象司是否不是空
     *
     * @param obj
     * @return
     */
    public static boolean nonNull(Object obj) {
        return obj != null;
    }

    /**
     * 判断两个对象是否相等
     *
     * @param a
     * @param b
     * @return
     */
    public static boolean equals(Object a, Object b) {
        return a != null && a.equals(b);
    }

    /**
     * 判断两个对象是否不相等
     *
     * @param a
     * @param b
     * @return
     */
    public static boolean unequal(Object a, Object b) {
        return (a != null && !a.equals(b)) || (b != null && !b.equals(a));
    }

    /**
     * 判断集合是否是空
     *
     * @param collection
     * @return
     */
    public static boolean isEmpty(Collection<?> collection) {
        return collection == null || collection.isEmpty();
    }

    /**
     * 判断集合是否不是空
     *
     * @param collection
     * @return
     */
    public static boolean nonEmpty(Collection<?> collection) {
        return !isEmpty(collection);
    }


    /**
     * 判断map 是否是空
     *
     * @param map
     * @return
     */
    public static boolean isEmpty(Map<?, ?> map) {
        return map == null || map.isEmpty();
    }

    /**
     * 判断map 是否不是空
     *
     * @param map
     * @return
     */
    public static boolean nonEmpty(Map<?, ?> map) {
        return !isEmpty(map);
    }


    /**
     * 判断字符串 是否是 null 或 length=0
     *
     * @param cs
     * @return
     */
    public static boolean stringIsEmpty(CharSequence cs) {
        return cs == null || cs.length() == 0;
    }


    /**
     * 判断字符串 是否不是 null 并且 length!=0
     *
     * @param cs
     * @return
     */
    public static boolean stringNonEmpty(CharSequence cs) {
        return !stringIsEmpty(cs);
    }

    /**
     * 判断字符是否是空字符
     *
     * @param cs
     * @return
     */
    public static boolean stringIsBlank(CharSequence cs) {
        int strLen;
        if (cs == null || (strLen = cs.length()) == 0) {
            return true;
        }
        for (int i = 0; i < strLen; i++) {
            if (!Character.isWhitespace(cs.charAt(i))) {
                return false;
            }
        }
        return true;
    }

    /**
     * 判断字符是否是空字符
     *
     * @param cs
     * @return
     */
    public static boolean stringNonBlank(CharSequence cs) {
        return !stringIsBlank(cs);
    }


    /**
     * 去掉字符串前后空白字符
     *
     * @param str
     * @return
     */
    public static String stringTrim(final String str) {
        return str == null ? null : str.trim();
    }

    /**
     * 单个对象复制
     *
     * @param source
     * @param targetClass
     * @param <T>
     * @return
     */

    public static <T> T copyObject(Object source, Class<T> targetClass) {
        if (isNull(source)) {
            return null;
        }
        try {
            T target = targetClass.newInstance();
            BeanUtils.copyProperties(source, target);
            return target;
        } catch (Exception e) {
            throw new ContextRuntimeException(COPY_OBJECT_FAIL, e);
        }
    }

    /**
     * 集合复制
     *
     * @param sourceList
     * @param targetClass
     * @param <T>
     * @return
     */
    public static <S, T> List<T> copyObjectList(List<S> sourceList, Class<T> targetClass) {
        List<T> targetList = Lists.newArrayList();
        if (nonEmpty(sourceList)) {
            for (S source : sourceList) {
                targetList.add(copyObject(source, targetClass));
            }
        }
        return targetList;
    }

    /**
     * 集合通过连接符号返回字符串
     *
     * @param iterable
     * @param separator
     * @return
     */
    public static String stringJoin(Iterable<?> iterable, String separator) {
        return iterable == null ? null : stringJoin(iterable.iterator(), separator);
    }

    private static String stringJoin(Iterator<?> iterator, String separator) {
        if (iterator == null) {
            return null;
        } else if (!iterator.hasNext()) {
            return "";
        } else {
            Object first = iterator.next();
            if (!iterator.hasNext()) {
                return Objects.toString(first, "");
            } else {
                StringBuilder buf = new StringBuilder(256);
                if (first != null) {
                    buf.append(first);
                }

                while (iterator.hasNext()) {
                    if (separator != null) {
                        buf.append(separator);
                    }

                    Object obj = iterator.next();
                    if (obj != null) {
                        buf.append(obj);
                    }
                }
                return buf.toString();
            }
        }
    }


}