Android Open Source - EverToDo Context Parser

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License

The source code is released under:

GNU General Public License

Java Source Code

/**
 *//  ww  w.  j av a  2 s.  c o  m
 * Todo.txt Touch/src/com/todotxt/todotxttouch/task/ContextParser.java
 *
 * Copyright (c) 2009-2011 mathias, Gina Trapani, Tim Barlotta
 *
 * LICENSE:
 *
 * This file is part of Todo.txt Touch, an Android app for managing your todo.txt file (http://todotxt.com).
 *
 * Todo.txt Touch is free software: you can redistribute it and/or modify it under the terms of the GNU General Public
 * License as published by the Free Software Foundation, either version 2 of the License, or (at your option) any
 * later version.
 *
 * Todo.txt Touch is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License along with Todo.txt Touch.  If not, see
 * <http://www.gnu.org/licenses/>.
 *
 * ContextParser
 * A utility class for parsing a string to find all contexts. A context is any
 * substring of the input text that starts with @ character and ends with a
 * space or the end of the text. e.g. @phone
 *
 * @author mathias <mathias[at]x2[dot](none)>
 * @author Gina Trapani <ginatrapani[at]gmail[dot]com>
 * @author Tim Barlotta <tim[at]barlotta[dot]net>
 * @license http://www.gnu.org/licenses/gpl.html
 * @copyright 2009-2011 mathias, Gina Trapani, Tim Barlotta
 */
package com.todotxt.todotxttouch.task;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

class ContextParser {
  private final static Pattern CONTEXT_PATTERN = Pattern
      .compile("(?:^|\\s)@(\\S*\\w)");
  private static final ContextParser INSTANCE = new ContextParser();

  private ContextParser() {
  }

  public static ContextParser getInstance() {
    return INSTANCE;
  }

  public List<String> parse(String inputText) {
    if (inputText == null) {
      return Collections.emptyList();
    }

    Matcher m = CONTEXT_PATTERN.matcher(inputText);
    List<String> contexts = new ArrayList<String>();
    while (m.find()) {
      String context = m.group(1);
      contexts.add(context);
    }
    return contexts;
  }
}

Java Source Code List

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