io.bdeploy.common.cfg.NonExistingOrEmptyDirPathValidator Maven / Gradle / Ivy

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package io.bdeploy.common.cfg;

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.stream.Stream;

import io.bdeploy.common.cfg.Configuration.ConfigValidator;
import io.bdeploy.common.cfg.Configuration.ValidationMessage;
import io.bdeploy.common.util.PathHelper;

/**
 * Checks if the given {@link Path} does not exist. Empty directories are also considered valid.
 */
@ValidationMessage("Path exists, but should not exist (or be an empty directory): %s")
public class NonExistingOrEmptyDirPathValidator implements ConfigValidator {

    @Override
    public boolean test(String value) {
        Path p = Paths.get(value);
        if (Files.isDirectory(p)) {
            // Empty directories are OK.
            try (Stream list = Files.list(p)) {
                return list.findAny().isEmpty();
            } catch (IOException e) {
                throw new IllegalStateException("Cannot determine directory contents: " + p, e);
            }
        }
        return !PathHelper.exists(p);
    }
}