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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) 2000-2024, Sualeh Fatehi .
All rights reserved.
------------------------------------------------------------------------

SchemaCrawler is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

SchemaCrawler and the accompanying materials are made available under
the terms of the Eclipse Public License v1.0, GNU General Public License
v3 or GNU Lesser General Public License v3.

You may elect to redistribute this code under any of these licenses.

The Eclipse Public License is available at:
http://www.eclipse.org/legal/epl-v10.html

The GNU General Public License v3 and the GNU Lesser General Public
License v3 are available at:
http://www.gnu.org/licenses/

========================================================================
*/

package us.fatehi.utility;

import static java.util.Objects.requireNonNull;
import static us.fatehi.utility.IOUtility.createTempFilePath;

import java.nio.file.Path;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.Callable;
import java.util.logging.Level;
import java.util.logging.Logger;

import us.fatehi.utility.string.StringFormat;

public class ProcessExecutor implements Callable {

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

  private List command;
  private Path processOutput;
  private Path processError;
  private int exitCode;

  @Override
  public Integer call() {

    try {
      requireNonNull(command, "No command provided");

      processOutput = createTempFilePath("temp", "stdout");
      processError = createTempFilePath("temp", "stderr");

      if (command.isEmpty()) {
        return null;
      }

      LOGGER.log(Level.CONFIG, new StringFormat("Executing:%n%s", command));

      final ProcessBuilder processBuilder = new ProcessBuilder(command);
      processBuilder.redirectOutput(processOutput.toFile());
      processBuilder.redirectError(processError.toFile());

      final Process process = processBuilder.start();
      exitCode = process.waitFor();
    } catch (final Throwable t) {
      if (exitCode == 0) {
        exitCode = Integer.MIN_VALUE;
      }
      LOGGER.log(Level.SEVERE, t.getMessage(), t);
    }

    return exitCode;
  }

  public List getCommand() {
    return command;
  }

  public int getExitCode() {
    return exitCode;
  }

  public Path getProcessError() {
    return processError;
  }

  public Path getProcessOutput() {
    return processOutput;
  }

  public void setCommandLine(final List args) {
    command = new ArrayList<>(args);
  }
}