Android String Strip stripControlCharacters(Object value)

Description

Strip an Object of it's ISO control characters.

License

Apache License

Parameter

Parameter	Description
value	The Object that should be stripped. This objects toString method will called and the result passed to #stripControlCharacters(String) .

Return

String A new String instance with its hexadecimal control characters replaced by a space. Or the unmodified String if it does not contain any ISO control characters.

Declaration

public static String stripControlCharacters(Object value)

Method Source Code

//package com.java2s;
/*/* ww  w .  ja va  2 s .co m*/
 * Copyright 2009 Red Hat, Inc.
 *
 * Red Hat 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.
 */

public class Main {
    /**
     * Strip an Object of it's ISO control characters.
     *
     * @param value
     *          The Object that should be stripped. This objects toString method will
     *          called and the result passed to {@link #stripControlCharacters(String)}.
     * @return {@code String}
     *          A new String instance with its hexadecimal control characters replaced
     *          by a space. Or the unmodified String if it does not contain any ISO
     *          control characters.
     */
    public static String stripControlCharacters(Object value) {
        if (value == null) {
            return null;
        }

        return stripControlCharacters(value.toString());
    }

    /**
     * Strip a String of it's ISO control characters.
     *
     * @param value
     *          The String that should be stripped.
     * @return {@code String}
     *          A new String instance with its hexadecimal control characters replaced
     *          by a space. Or the unmodified String if it does not contain any ISO
     *          control characters.
     */
    public static String stripControlCharacters(String value) {

        boolean hasControlChars = false;
        for (int i = value.length() - 1; i >= 0; i--) {
            if (Character.isISOControl(value.charAt(i))) {
                hasControlChars = true;
                break;
            }
        }

        if (!hasControlChars) {
            return value;
        }

        StringBuilder buf = new StringBuilder(value.length());
        int i = 0;

        // Skip initial control characters (i.e. left trim)
        for (; i < value.length(); i++) {
            if (!Character.isISOControl(value.charAt(i))) {
                break;
            }
        }

        // Copy non control characters and substitute control characters with
        // a space.  The last control characters are trimmed.
        boolean suppressingControlChars = false;
        for (; i < value.length(); i++) {
            if (Character.isISOControl(value.charAt(i))) {
                suppressingControlChars = true;
                continue;
            } else {
                if (suppressingControlChars) {
                    suppressingControlChars = false;
                    buf.append(' ');
                }
                buf.append(value.charAt(i));
            }
        }

        return buf.toString();
    }
}