org.apache.tapestry.unicorn.utils.UrlUtils.java Source code

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Here is the source code for org.apache.tapestry.unicorn.utils.UrlUtils.java

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/* Copyright 2011 The Apache Software Foundation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.tapestry.unicorn.utils;

import org.apache.commons.lang.StringUtils;

/**
 * Some simple URL manipulation utilities.
 */
public class UrlUtils {
    /**
     * The start of the URL of all core library components (without protocol)
     */
    public static final String CORE_DOCUMENTATION_URL_PREFIX = "tapestry.apache.org/current/tapestry-core/ref/org/apache/tapestry5/";

    /**
     * Shorten the given Url string
     * 
     * @param url
     * @return
     */
    public static String shorten(String url, int length) {

        if (url == null) {
            return "";
        }

        // remove leading http:// or https://
        String newUrl = removeProtocol(url);

        // remove trailing slash, if any
        if (newUrl.endsWith("/")) {
            newUrl = newUrl.substring(0, newUrl.length() - 1);
        }

        if (newUrl.startsWith(CORE_DOCUMENTATION_URL_PREFIX)) {
            return "..." + newUrl.substring(CORE_DOCUMENTATION_URL_PREFIX.length());
        }
        return StringUtils.abbreviateMiddle(newUrl, "...", length);
    }

    /**
     * Remove any "http://" or "https://" from the beginning of the given URL
     * 
     * @param url
     * @return the shortened URL
     */
    private static String removeProtocol(String url) {

        if (url.startsWith("http://")) {
            return url.substring("http://".length());
        }
        if (url.startsWith("https://")) {
            return url.substring("https://".length());
        }
        return url;
    }
}