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Kiwi is a utility library. We really like Google's Guava, and also use Apache Commons. But if they don't have something we need, and we think it is useful, this is where we put it.

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package org.kiwiproject.config;

import static java.util.stream.Collectors.joining;
import static org.apache.commons.lang3.StringUtils.EMPTY;
import static org.apache.commons.lang3.StringUtils.isNotBlank;
import static org.kiwiproject.base.KiwiPreconditions.checkArgumentNotBlank;
import static org.kiwiproject.base.KiwiStrings.f;

import lombok.Builder;
import org.apache.commons.lang3.StringUtils;

import java.util.stream.Stream;

/**
 * Package-private helper class used by {@link EndpointConfiguration} to generate URIs.
 */
@Builder
class EndpointUriBuilder {

    private static final String SLASH = "/";

    private final String scheme;
    private final String host;
    private final String port;
    private final String path;
    private final UrlRewriteConfiguration urlRewriteConfig;

    String getURI() {
        var schemeAndHost = getSchemeAndHostString(scheme, host);
        var hostAndPort = getHostAndPort(schemeAndHost, port);
        return buildUri(hostAndPort, getPathPrefix(urlRewriteConfig), stripLeadingAndTrailingSlashes(path));
    }

    private static String getSchemeAndHostString(String scheme, String host) {
        checkArgumentNotBlank(scheme, "scheme cannot be blank");
        checkArgumentNotBlank(host, "host cannot be blank");

        return f("{}://{}", scheme, host);
    }

    private static String getHostAndPort(String schemeAndHost, String port) {
        return isNotBlank(port) ? f("{}:{}", schemeAndHost, port) : schemeAndHost;
    }

    static String stripLeadingAndTrailingSlashes(String value) {
        return StringUtils.strip(value, SLASH);
    }

    private static String getPathPrefix(UrlRewriteConfiguration config) {
        return config.shouldRewrite() ? stripLeadingAndTrailingSlashes(config.getPathPrefix()) : EMPTY;
    }

    private static String buildUri(String... uriParts) {
        return Stream.of(uriParts)
                .filter(StringUtils::isNotBlank)
                .collect(joining(SLASH));
    }
}