/*
* eXist Open Source Native XML Database
* Copyright (C) 2001-06 The eXist Project
* http://exist-db.org
*
* This program 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
* of the License, or (at your option) any later version.
*
* This program 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. 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* $Id$
*/
package org.exist.start;
import java.io.File;
import java.io.IOException;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.Collections;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* This class uses regex pattern matching to find the latest version of a
* particular jar file.
*
* @see LatestFileResolver#getResolvedFileName(String)
*
* @author Ben Schmaus (exist@benschmaus.com)
* @version $Revision$
*/
public class LatestFileResolver {
// Pattern that can be used to indicate that the
// latest version of a particular file should be added to the classpath.
// E.g., commons-fileupload-%latest%.jar would resolve to something like
// commons-fileupload-1.1.jar.
private final static Pattern latestVersionPattern = Pattern.compile(
"(%latest%)"
);
// Set debug mode for each file resolver instance based on whether or
// not the system was started with debugging turned on.
private static boolean _debug = Boolean.getBoolean("exist.start.debug");
/**
* If the passed file name contains a %latest% token,
* find the latest version of that file. Otherwise, return
* the passed file name unmodified.
*
* @param filename Path relative to exist home dir of
* a jar file that should be added to the classpath.
*/
public String getResolvedFileName(final String filename) {
final Matcher matches = latestVersionPattern.matcher(filename);
if (!matches.find()) {
return filename;
}
final String[] fileinfo = filename.split("%latest%");
// Path of file up to the beginning of the %latest% token.
final String uptoToken = fileinfo[0];
// Dir that should contain our jar.
final String containerDirName = uptoToken.substring(
0, uptoToken.lastIndexOf(File.separatorChar)
);
final Path containerDir = Paths.get(containerDirName);
final String artifactId = Pattern.quote(uptoToken.substring(uptoToken.lastIndexOf(File.separatorChar) + 1));
final String suffix = Pattern.quote(fileinfo[1]);
final String patternString = '^' + artifactId + "(?:(?:[0-9]+(?:\\.[0-9]+)*)(?:-SNAPSHOT)?(?:-[0-9a-f]{7})?)" + suffix + '$';
final Pattern pattern = Pattern.compile(patternString);
final Matcher matcher = pattern.matcher("");
List<Path> jars;
try {
jars = Main.list(containerDir, p -> {
matcher.reset(Main.fileName(p));
return matcher.find();
});
} catch (final IOException e) {
System.err.println("ERROR: No jars found in " + containerDir.toAbsolutePath());
e.printStackTrace();
jars = Collections.emptyList();
}
if (!jars.isEmpty()) {
final String actualFileName = jars.get(0).toAbsolutePath().toString();
if (_debug) {
System.err.println(
"Found match: " + actualFileName
+ " for jar file pattern: " + filename
);
}
return actualFileName;
} else {
if (_debug) {
System.err.println(
"WARN: No latest version found for JAR file: '"
+ filename + "'"
);
}
}
return filename;
}
}