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SchemaCrawler is an open-source Java API that makes working with database metadata as easy as working with plain old Java objects. SchemaCrawler is also a database schema discovery and comprehension, and schema documentation tool. You can search for database schema objects using regular expressions, and output the schema and data in a readable text format. The output is designed to be diff-ed against other database schemas.

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/*
 *
 * SchemaCrawler
 * http://www.schemacrawler.com
 * Copyright (c) 2000-2015, Sualeh Fatehi.
 *
 * This library is free software; you can redistribute it and/or modify it under the terms
 * of the GNU Lesser General Public License as published by the Free Software Foundation;
 * either version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
 * within even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License along with this
 * library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
 * Boston, MA 02111-1307, USA.
 *
 */
package schemacrawler.tools.iosource;


import static java.nio.file.Files.exists;
import static java.nio.file.Files.isReadable;
import static java.nio.file.Files.newInputStream;
import static java.util.Objects.requireNonNull;

import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.nio.charset.Charset;
import java.nio.file.Path;
import java.util.logging.Level;
import java.util.logging.Logger;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;

public class CompressedFileInputResource
  implements InputResource
{

  private static final Logger LOGGER = Logger
    .getLogger(CompressedFileInputResource.class.getName());

  private final Path inputFile;
  private final String internalPath;

  public CompressedFileInputResource(final Path filePath,
                                     final String internalPath)
                                       throws IOException
  {
    inputFile = requireNonNull(filePath, "No file path provided").normalize()
      .toAbsolutePath();
    if (!exists(filePath) || !isReadable(filePath))
    {
      throw new IOException("Cannot read file, " + filePath);
    }

    this.internalPath = requireNonNull(internalPath,
                                       "No internal file path provided");
  }

  public Path getInputFile()
  {
    return inputFile;
  }

  @Override
  public Reader openNewInputReader(final Charset charset)
    throws IOException
  {
    final InputStream fileStream = newInputStream(inputFile);

    final ZipInputStream zipInputStream = new ZipInputStream(fileStream);
    final ZipEntry zipEntry = zipInputStream.getNextEntry();
    if (zipEntry == null || !zipEntry.getName().equals(internalPath))
    {
      throw new IOException("Zip file does not contain " + internalPath);
    }

    final Reader reader = new InputStreamReader(zipInputStream, charset);
    LOGGER.log(Level.INFO,
               "Opened input reader to compressed file, " + inputFile);

    return new InputReader(getDescription(), reader, true);
  }

  @Override
  public String toString()
  {
    return getDescription();
  }

  private String getDescription()
  {
    return inputFile.toString();
  }

}