Removes "unwanted" control chars from the given content. - Java java.lang

Java examples for java.lang:char

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Description

Removes "unwanted" control chars from the given content.

Demo Code

/**/* www  . j av  a 2 s  .c  o  m*/
 * This file is part of Port@l
 * Port@l 3.0 - Portal Engine and Management System
 * Copyright (C) 2010  Isotrol, SA.  http://www.isotrol.com
 *
 * Port@l 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 3 of the License, or
 * (at your option) any later version.
 *
 * Port@l 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 Port@l.  If not, see <http://www.gnu.org/licenses/>.
 */
//package com.java2s;

public class Main {
    /**
     * Removes "unwanted" control chars from the given content.<p>
     * 
     * @param content the content to remove the unwanted control chars from
     * 
     * @return the content with the unwanted control chars removed
     */
    protected static String removeControlChars(String content) {

        if (content == null || content.trim().length() == 0) {
            // to avoid later null pointer exceptions an empty String is returned
            return "";
        }

        char[] chars = content.toCharArray();
        StringBuffer result = new StringBuffer(chars.length);
        boolean wasUnwanted = false;
        for (int i = 0; i < chars.length; i++) {
            char ch = chars[i];

            int type = Character.getType(ch);
            switch (type) {

            // punctuation
            case Character.CURRENCY_SYMBOL:
            case Character.CONNECTOR_PUNCTUATION:
            case Character.FINAL_QUOTE_PUNCTUATION:
            case Character.INITIAL_QUOTE_PUNCTUATION:
            case Character.DASH_PUNCTUATION:
            case Character.START_PUNCTUATION:
            case Character.END_PUNCTUATION:
            case Character.OTHER_PUNCTUATION:
                // letters
            case Character.OTHER_LETTER:
            case Character.MODIFIER_LETTER:
            case Character.UPPERCASE_LETTER:
            case Character.TITLECASE_LETTER:
            case Character.LOWERCASE_LETTER:
                // digits
            case Character.DECIMAL_DIGIT_NUMBER:
                // spaces
            case Character.SPACE_SEPARATOR:
                result.append(ch);
                wasUnwanted = false;
                break;

            // line separators
            case Character.LINE_SEPARATOR:
                result.append('\n');
                wasUnwanted = true;
                break;

            // symbols
            case Character.MATH_SYMBOL:
            case Character.OTHER_SYMBOL:
                // other stuff:
            case Character.CONTROL:
            case Character.COMBINING_SPACING_MARK:
            case Character.ENCLOSING_MARK:
            case Character.FORMAT:
            case Character.LETTER_NUMBER:
            case Character.MODIFIER_SYMBOL:
            case Character.NON_SPACING_MARK:
            case Character.PARAGRAPH_SEPARATOR:
            case Character.PRIVATE_USE:
            case Character.SURROGATE:
            case Character.UNASSIGNED:
            case Character.OTHER_NUMBER:
            default:
                if (!wasUnwanted) {
                    result.append('\n');
                    wasUnwanted = true;
                }
            }
        }

        return result.toString();
    }
}

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