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/**
 * Copyright (c) 2015-2016, BruceZCQ ([email protected]).
 *
 * 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 goja.rapid.mvc.upload.filerenamepolicy;

import goja.core.StringPool;
import goja.core.kits.lang.Strs;
import com.jfinal.kit.HashKit;

import com.oreilly.servlet.multipart.FileRenamePolicy;

import java.io.File;

/**
 * 随机文件名
 *
 * @author BruceZCQ
 */
public class RandomFileRenamePolicy implements FileRenamePolicy {

    @Override
    public File rename(File f) {
        if (null == f) {
            return null;
        }
        String name = f.getName();
        String ext = StringPool.EMPTY;
        int dot = name.lastIndexOf(StringPool.DOT);
        if (dot != -1) {
            ext = name.substring(dot);
        }
        return (new File(f.getParent(), HashKit.md5(Strs.randomStr()) + ext));
    }
}