ro.cosu.vampires.server.values.FileInfo.java Source code

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Here is the source code for ro.cosu.vampires.server.values.FileInfo.java

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/*
 *
 *  * The MIT License (MIT)
 *  * Copyright  2016 Cosmin Dumitru, http://cosu.ro <cosu@cosu.ro>
 *  *
 *  * Permission is hereby granted, free of charge, to any person obtaining a copy
 *  * of this software and associated documentation files (the Software?), to deal
 *  * in the Software without restriction, including without limitation the rights
 *  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 *  * copies of the Software, and to permit persons to whom the Software is
 *  * furnished to do so, subject to the following conditions:
 *  *
 *  * The above copyright notice and this permission notice shall be included in
 *  * all copies or substantial portions of the Software.
 *  *
 *  * THE SOFTWARE IS PROVIDED AS IS?, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 *  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 *  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 *  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 *  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 *  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 *  * THE SOFTWARE.
 *  *
 *
 */

package ro.cosu.vampires.server.values;

import com.google.auto.value.AutoValue;
import com.google.common.hash.Hashing;
import com.google.common.io.Files;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.File;
import java.io.IOException;
import java.util.Optional;

import ro.cosu.vampires.server.util.gson.AutoGson;

@AutoValue
@AutoGson
public abstract class FileInfo {
    private static final Logger LOG = LoggerFactory.getLogger(FileInfo.class);

    public static Optional<FileInfo> fromFile(File file) {
        String hash = null;
        FileInfo result = null;
        try {
            hash = Files.asByteSource(file).hash(Hashing.sha1()).toString();
            String name = file.getName();
            long size = file.length();
            result = new AutoValue_FileInfo(size, hash, name);
        } catch (IOException e) {
            LOG.error("can not create info for " + file.getName(), e);
        }
        return Optional.ofNullable(result);

    }

    public abstract long size();

    public abstract String id();

    public abstract String name();

}