TwitterTextHelper.java

/*
 * Copyright (c) 2014 Martin W. Kirst (nitram509 at bitkings dot de)
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

package net.nitram509.twitter;

public class TwitterTextHelper {

  private static final int MAX_SUFFIX_LENGTH = 140;

  public static final String HASHTAG_SEPARATOR = " ";

  public String appendDefaultHashtag(String text, String suffix) {
    if (suffix == null || suffix.trim().isEmpty()) {
      return text;
    }
    String s = text.toLowerCase();
    if (s.contains(suffix.toLowerCase())) {
      return text;
    }
    if ((text.length() + HASHTAG_SEPARATOR.length() + suffix.length()) < MAX_SUFFIX_LENGTH) {
      return text + HASHTAG_SEPARATOR + suffix;
    }
    return text;
  }

  public static String makeSafeSuffix(String suffix) {
    String safeSuffix = null;
    if (suffix != null) {
      int maxLength = Math.min(MAX_SUFFIX_LENGTH, suffix.length());
      safeSuffix = suffix.substring(0, maxLength);
    }
    return safeSuffix;
  }
}