org.thelq.stackexchange.dbimport.sources.ArchiveDumpEntry.java Source code

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Here is the source code for org.thelq.stackexchange.dbimport.sources.ArchiveDumpEntry.java

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/**
 * Copyright (C) 2013 Leon Blakey <lord.quackstar at gmail.com>
 *
 * This file is part of Unified StackExchange Data Dump Importer.
 *
 * 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, softwar
 * 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 org.thelq.stackexchange.dbimport.sources;

import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import lombok.Getter;
import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.compress.archivers.sevenz.SevenZArchiveEntry;
import org.apache.commons.compress.archivers.sevenz.SevenZFile;
import org.apache.commons.lang3.SystemUtils;
import org.thelq.stackexchange.dbimport.Controller;

/**
 *
 * @author Leon
 */
@RequiredArgsConstructor
@Slf4j
public class ArchiveDumpEntry extends DumpEntry {
    protected final Controller controller;
    protected final File file;
    protected final SevenZArchiveEntry fileEntry;
    @Getter
    protected final String name;
    @Getter
    protected final String location;
    @Getter
    protected final long sizeBytes;
    protected InputStream input;

    public ArchiveDumpEntry(Controller controller, File file, SevenZArchiveEntry fileEntry) {
        this.controller = controller;
        this.file = file;
        this.fileEntry = fileEntry;
        this.name = fileEntry.getName();
        this.location = file.getAbsolutePath() + SystemUtils.FILE_SEPARATOR + name;
        this.sizeBytes = fileEntry.getSize();
    }

    public InputStream getInput() {
        if (input != null)
            throw new RuntimeException("Already generated an InputStream");

        try {
            final SevenZFile file7 = new SevenZFile(file);
            //Advance archive until we find the correct ArchiveEntry
            SevenZArchiveEntry curEntry;
            while ((curEntry = file7.getNextEntry()) != null) {
                if (!curEntry.getName().equals(name))
                    continue;
                //Found, return a wrapped InputStream
                return new InputStream() {
                    @Override
                    public int read() throws IOException {
                        return file7.read();
                    }
                };
            }
        } catch (IOException ex) {
            throw new RuntimeException("Cannot open archive entry", ex);
        }
        //Didn't find anything
        throw new RuntimeException("Could not find file " + name + " in archive " + file.getAbsolutePath());
    }

    public void close() {
    }
}