org.apache.wicket.request.UrlUtils.java Source code

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Here is the source code for org.apache.wicket.request.UrlUtils.java

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.wicket.request;

import org.apache.wicket.util.string.Strings;

/**
 * Various url utilities
 *
 * @author igor.vaynberg
 */
public class UrlUtils {
    /**
     * Constructor
     */
    // TODO make it private in Wicket 7.0
    protected UrlUtils() {

    }

    /**
     * Checks if the url is relative or absolute
     *
     * @param url
     * @return <code>true</code> if url is relative, <code>false</code> otherwise
     */
    public static boolean isRelative(final String url) {
        // the regex means "doesn't start with 'scheme://'"
        if ((url != null) && (url.startsWith("/") == false) && (!url.matches("^\\w+\\:\\/\\/.*"))
                && !(url.startsWith("#"))) {
            return true;
        } else {
            return false;
        }
    }

    /**
     * Rewrites a relative url to be context relative, leaves absolute urls same.
     *
     * @param url
     * @param requestCycle
     * @return rewritten url
     */
    public static String rewriteToContextRelative(String url, IRequestCycle requestCycle) {
        if (isRelative(url)) {
            return requestCycle.getUrlRenderer().renderContextRelativeUrl(url);
        } else {
            return url;
        }
    }

    /**
     * Makes sure the path starts with a slash and does not end with a slash. Empty or null paths
     * are normalized into an empty string.
     *
     * @param path
     *            path to normalize
     * @return normalized path
     */
    public static String normalizePath(String path) {
        if (Strings.isEmpty(path)) {
            return "";
        }
        path = path.trim();
        if (!path.startsWith("/")) {
            path = "/" + path;
        }
        if (path.endsWith("/")) {
            path = path.substring(0, path.length() - 1);
        }
        return path;
    }
}