Example usage for org.apache.commons.lang3 StringUtils prependIfMissing

Introduction

In this page you can find the example usage for org.apache.commons.lang3 StringUtils prependIfMissing.

Prototype

public static String prependIfMissing(final String str, final CharSequence prefix,
        final CharSequence... prefixes) 

Source Link

Document

Prepends the prefix to the start of the string if the string does not already start with any of the prefixes.

Usage

From source file:com.labs64.utils.swid.support.SwidUtils.java

/**
 * <p>/*from   w w w . ja v a  2  s  .  c o m*/
 * Revert given URL according to the <a href="http://en.wikipedia.org/wiki/Reverse_domain_name_notation">Reverse
 * domain name notation</a>
 * </p>
 * <p>
 * 
 * @see <a
 *      href="http://en.wikipedia.org/wiki/Reverse_domain_name_notation">http://en.wikipedia.org/wiki/Reverse_domain_name_notation</a>
 *      </p>
 * 
 * @param domainName
 *            the domain name to be reverted
 * @return reverted domain name
 */
public static String revertDomainName(final String domainName) {
    if (StringUtils.isBlank(domainName)) {
        throw new SwidException("domainName isn't defined");
    }

    try {
        URI uri = new URI(StringUtils.prependIfMissing(domainName, "http://", "https://"));
        String hostName = StringUtils.removeStart(uri.getHost(), "www.");

        String[] domainNameSplit = StringUtils.split(hostName, ".");
        CollectionUtils.reverseArray(domainNameSplit);
        return StringUtils.join(domainNameSplit, ".");
    } catch (URISyntaxException e) {
        throw new SwidException("Cannot revert domain name");
    }
}

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