.filter(StringUtil::isNotBlank)
                .distinct()
                .collect(Collectors.joining("\n")));
        body.virtualHosts = stream(entity.getVirtualHosts())
                .get(stream -> stream.filter(StringUtil::isNotBlank).distinct().map(String::trim).collect(Collectors.joining("\n")));
        return body;
    }

}

// readDirFn applies the fn() function on each entries at dirPath, doesn't recurse into
// the directory itself, if the dirPath doesn't exist this function doesn't return
// an error.
func readDirFn(dirPath string, filter func(name string, typ os.FileMode) error) error {
	d, err := Open(dirPath)
	if err != nil {
		if osErrToFileErr(err) == errFileNotFound {
			return nil
		}
		return osErrToFileErr(err)
	}
	defer d.Close()

        assertTrue(result.contains("field1field2"));
        assertTrue(result.contains("exclude1exclude2"));

        // Count separators
        long separatorCount = result.chars().filter(ch -> ch == '\n').count();
        assertEquals(4, separatorCount);
    }

    public void test_getCacheKey_nullParameters() {
        String seed = "test_seed";
        String[] tags = null;

import org.apache.maven.api.Service;
import org.apache.maven.api.annotations.Experimental;
import org.apache.maven.api.annotations.Nonnull;

/**
 * Service for creating {@link PathMatcher} objects that can be used to filter files
 * based on include/exclude patterns. This service provides a clean API for plugins
 * to create path matchers without directly depending on implementation classes.
 * <p>

        } else if (input instanceof List) {
            values = ((List<?>) input).stream().filter(Objects::nonNull).map(Object::toString).toArray(n -> new String[n]);
        } else if (input instanceof String) {
            return input.toString();
        }
        if (values != null) {
            return stream(values).get(stream -> stream.filter(StringUtil::isNotBlank).map(String::trim).collect(Collectors.joining(" ")));
        }

        bool((must, should, mustNot, filter) -> {
            filteredLambda.callback(must, filter);
        }, opLambda);
    }

    public void not(OperatorCall<RoleCQ> notLambda) {
        not(notLambda, null);
    }

    public void not(final OperatorCall<RoleCQ> notLambda, final ConditionOptionCall<BoolQueryBuilder> opLambda) {
        bool((must, should, mustNot, filter) -> notLambda.callback(mustNot), opLambda);
    }

    public interface BoolCall<CQ extends EsAbstractConditionQuery> {

        void callback(CQ must, CQ should, CQ mustNot, CQ filter);
    }

    @FunctionalInterface
    public interface FilteredCall<CQ extends EsAbstractConditionQuery, CF extends EsAbstractConditionQuery> {

        void callback(CQ query, CF filter);
    }

    @FunctionalInterface
    public interface OperatorCall<CQ extends EsAbstractConditionQuery> {

    public interface BoolCall<CQ extends EsAbstractConditionQuery> {

        void callback(CQ must, CQ should, CQ mustNot, CQ filter);
    }

    @FunctionalInterface
    public interface FilteredCall<CQ extends EsAbstractConditionQuery, CF extends EsAbstractConditionQuery> {

        void callback(CQ query, CF filter);
    }

    @FunctionalInterface
    public interface OperatorCall<CQ extends EsAbstractConditionQuery> {

    /**
     * Gets plugin JAR files from the plugin directory that match the specified filter.
     *
     * @param filter the FilenameFilter to apply when selecting plugin JAR files
     * @return an array of File objects representing matching plugin JAR files, or empty array if none found
     */
    public static File[] getPluginJarFiles(final FilenameFilter filter) {
        final File libDir = getPluginPath().toFile();

    public interface BoolCall<CQ extends EsAbstractConditionQuery> {

        void callback(CQ must, CQ should, CQ mustNot, CQ filter);
    }

    @FunctionalInterface
    public interface FilteredCall<CQ extends EsAbstractConditionQuery, CF extends EsAbstractConditionQuery> {

        void callback(CQ query, CF filter);
    }

    @FunctionalInterface
    public interface OperatorCall<CQ extends EsAbstractConditionQuery> {