StringUtil.java

/*
 * Copyright (c) www.bugull.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 net.tooan.ynpay.third.mongodb.mapper;

/**
 * Utility class for String.
 *
 * @author Frank Wen(xbwen@hotmail.com)
 */
public final class StringUtil {

    /**
     * Check if a string is empty
     *
     * @param s
     * @return
     */
    public static boolean isEmpty(String s) {
        return s == null || s.trim().length() == 0;
    }

    /**
     * Get the file's extension name, such as doc, png, jpeg
     *
     * @param filename
     * @return
     */
    public static String getExtention(String filename) {
        String ext = null;
        int index = filename.lastIndexOf(".");
        if (index > 0) {
            ext = filename.substring(index + 1);
        }
        return ext;
    }

}