org.eolang.maven.DepDirs Maven / Gradle / Ivy
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*
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*
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package org.eolang.maven;
import java.io.File;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.LinkedList;
import java.util.List;
import java.util.regex.Pattern;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import org.cactoos.list.ListEnvelope;
/**
* Walk through directories in a directory and find dep names. Each
* dep is a subdirectory of the FOURTH level,
* for example "org.eolang/eo-runtime/jar-with-dependencies/0.10.0".
*
* @since 0.13
*/
final class DepDirs extends ListEnvelope {
/**
* Ctor.
*
* @param dir The directory
* @throws IOException If fails
*/
DepDirs(final Path dir) throws IOException {
super(DepDirs.list(dir));
}
/**
* List them all.
* @param dir The dir
* @return List
* @throws IOException If fails
*/
private static List list(final Path dir) throws IOException {
final List names = new LinkedList<>();
if (Files.exists(dir)) {
final String home = dir.toAbsolutePath().toString();
try (Stream paths = Files.find(dir, 4, (t, u) -> true)) {
names.addAll(
paths
.filter(file -> file.toFile().isDirectory())
.map(file -> file.toAbsolutePath().toString())
.filter(name -> !name.equals(home))
.map(name -> name.substring(home.length() + 1))
.filter(name -> name.split(Pattern.quote(File.separator)).length == 4)
.collect(Collectors.toList())
);
}
}
return names;
}
}