Android String Value Check isWhitespace(final String s)

Description

Returns true if the specified string consists entirely of whitespace characters.

License

Apache License

Parameter

Parameter	Description
s	string to test.

Return

true if the specified string consists entirely of whitespace characters, false otherwise.

Declaration

public static boolean isWhitespace(final String s) 

Method Source Code

//package com.java2s;
/****************************************************************
 * Licensed to the Apache Software Foundation (ASF) under one   *
 * or more contributor license agreements.  See the NOTICE file *
 * distributed with this work for additional information        *
 * regarding copyright ownership.  The ASF 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   *
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 * 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 {
    /** US-ASCII CR, carriage return (13) */
    public static final int CR = '\r';
    /** US-ASCII LF, line feed (10) */
    public static final int LF = '\n';
    /** US-ASCII SP, space (32) */
    public static final int SP = ' ';
    /** US-ASCII HT, horizontal-tab (9)*/
    public static final int HT = '\t';

    /**//from   www .ja  v  a  2  s  .c  om
     * Returns <code>true</code> if the specified character is a whitespace
     * character (CR, LF, SP or HT).
     *
     * ANDROID:  COPIED FROM A NEWER VERSION OF MIME4J
     *
     * @param ch
     *            character to test.
     * @return <code>true</code> if the specified character is a whitespace
     *         character, <code>false</code> otherwise.
     */
    public static boolean isWhitespace(char ch) {
        return ch == SP || ch == HT || ch == CR || ch == LF;
    }

    /**
     * Returns <code>true</code> if the specified string consists entirely of
     * whitespace characters.
     *
     * ANDROID:  COPIED FROM A NEWER VERSION OF MIME4J
     *
     * @param s
     *            string to test.
     * @return <code>true</code> if the specified string consists entirely of
     *         whitespace characters, <code>false</code> otherwise.
     */
    public static boolean isWhitespace(final String s) {
        if (s == null) {
            throw new IllegalArgumentException("String may not be null");
        }
        final int len = s.length();
        for (int i = 0; i < len; i++) {
            if (!isWhitespace(s.charAt(i))) {
                return false;
            }
        }
        return true;
    }
}