import java.util.Collection;

import java.util.Map;

import java.util.UUID;

public class StringHelper {

    public static final String     EMPTY="";

    public StringHelper(){}

    /**

     * 判断字符串是否为NULL或空值

     * @param str

     * @return

     */

    @SuppressWarnings("rawtypes")

    public static Boolean IsEmptyOrNull(Object obj)

    {

        if (obj == null)

            return true;

        if ("".equals(obj))

            return true;

        if (obj instanceof String) {

            if (((String) obj).length() == 0) {

                return true;

            }

        } else if (obj instanceof Collection) {

            if (((Collection) obj).size() == 0) {

                return true;

            }

        } else if (obj instanceof Map) {

            if (((Map) obj).size() == 0) {

                return true;

            }

        }

        return false;

    }

    /**

     * NULL转String

     * @param obj

     * @return

     */

    public static String TranString(Object obj)

    {

        if (obj == null)

            return "";

        return obj.toString();

    }

    /**

     * NULL转String

     * @param obj

     * @param defaultval 默认值

     * @return

     */

    public static String TranString(Object obj, String defaultval)

    {

        if (obj == null)

            return defaultval;

        return obj.toString();

    }

    /**

     * 模糊查询%_通配符转换

     * @param str

     * @return

     */

    public static String TranSeachString(Object obj)

    {

        if (obj == null)

            return "";

        String result = obj.toString();

        return result.replace("\\", "\\\\").replace("_", "\\_").replace("%", "\\%");

        /*if (result.startsWith("%") || result.startsWith("_")) {

            result = "\\" + result;

        }

        if (!"\\%".equals(result) && !"\\_".equals(result) && result.length() >= 2 && (result.endsWith("%") || result.endsWith("_"))) {

            String tmp1 = result.substring(result.length() - 1, result.length());

            String tmp2 = result.substring(0, result.length() - 1);

            result = tmp2 + "\\" + tmp1;

        }

        return result;*/

    }

    /**

     * 获取GUID

     * @return

     */

    public static String GetGUID()

    {

        return UUID.randomUUID().toString().replace("-", "");

    }

}