PollUtils.java

/**********************************************************************************
 * $URL: https://source.sakaiproject.org/svn/polls/trunk/api/src/java/org/sakaiproject/poll/util/PollUtils.java $
 * $Id: PollUtils.java 105078 2012-02-24 23:00:38Z ottenhoff@longsight.com $
 ***********************************************************************************
 *
 * Copyright (c) 2008 The Sakai Foundation
 *
 * Licensed under the Educational Community 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.opensource.org/licenses/ECL-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.sakaiproject.poll.util;

public class PollUtils {

    public static String ENDING_P_SPACE_TAGS = "<p> </p>";
    public static String STARTING_P_TAG = "<p>";
    public static String ENDING_P_TAG = "</p>";

    /**
     * Attempts to remove all unnecessary P tags from html strings
     * 
     * @param cleanup an html string to cleanup
     * @return the cleaned up string
     */
    public static String cleanupHtmlPtags(String cleanup) {
        if (cleanup == null) {
            // nulls are ok
            return null;
        } else if (cleanup.trim().length() == 0) {
            // nothing to do
            return cleanup;
        }
        cleanup = cleanup.trim();

        if (cleanup.length() > ENDING_P_SPACE_TAGS.length()) {
            // (remove trailing blank lines)
            // - While (cleanup ends with "<p> </p>") remove trailing "<p> </p>".
            while (cleanup.toLowerCase().endsWith(ENDING_P_SPACE_TAGS)) {
                // chop off the end
                cleanup = cleanup.substring(0, cleanup.length() - ENDING_P_SPACE_TAGS.length()).trim();
            }
        }

        if (cleanup.length() > (STARTING_P_TAG.length() + ENDING_P_TAG.length())) {
            // (remove a single set of <p> tags)
            // if cleanup starts with "<p>" and cleanup ends with "</p>" and, remove leading "<p>" and trailing "</p>" from cleanup
            String lcCheck = cleanup.toLowerCase();
            if (lcCheck.startsWith(STARTING_P_TAG) 
                    && lcCheck.endsWith(ENDING_P_TAG)) {
                if (lcCheck.indexOf(STARTING_P_TAG, STARTING_P_TAG.length()) == -1 
                        && lcCheck.lastIndexOf(ENDING_P_TAG, lcCheck.length() - ENDING_P_TAG.length() - 1) == -1) {
                    // chop off the front and end P tags
                    cleanup = cleanup.substring(STARTING_P_TAG.length(), cleanup.length() - ENDING_P_TAG.length()).trim();
                }
            }
        }
        //remove the bad <br type="_moz" />
        cleanup = cleanup.replace("<br type=\"_moz\" />", "");

        return cleanup;
    }


    public static boolean isValidEmail(String email) {
        // TODO: Use a generic Sakai utility class (when a suitable one exists)

        if (email == null || email.equals(""))
            return false;

        email = email.trim();
        //must contain @
        if (email.indexOf("@") == -1)
            return false;

        //an email can't contain spaces
        if (email.indexOf(" ") > 0)
            return false;

        //"^[_A-Za-z0-9-]+(\\.[_A-Za-z0-9-]+)*@[A-Za-z0-9-]+(\\.[A-Za-z0-9-]+)*$" 
        if (email.matches("^[_A-Za-z0-9-]+(\\.[_A-Za-z0-9-]+)*@[A-Za-z0-9-]+(\\.[A-Za-z0-9-]+)*$")) 
            return true;

        return false;
    }

}