Example usage for java.lang CharSequence length

Introduction

In this page you can find the example usage for java.lang CharSequence length.

Prototype

int length();

Source Link

Document

Returns the length of this character sequence.

Usage

From source file:Main.java

/**
 * <p>Checks if a CharSequence is empty ("") or null.</p>
 * <p>/*from  ww  w  . ja va  2 s  .co m*/
 * <pre>
 * StringUtils.isEmpty(null)      = true
 * StringUtils.isEmpty("")        = true
 * StringUtils.isEmpty(" ")       = false
 * StringUtils.isEmpty("bob")     = false
 * StringUtils.isEmpty("  bob  ") = false
 * </pre>
 * <p>
 * <p>NOTE: This method changed in Lang version 2.0.
 * It no longer trims the CharSequence.
 * That functionality is available in isBlank().</p>
 *
 * @param cs the CharSequence to check, may be null
 * @return {@code true} if the CharSequence is empty or null
 * @since 3.0 Changed signature from isEmpty(String) to isEmpty(CharSequence)
 */
public static boolean isEmpty(final CharSequence cs) {
    return cs == null || cs.length() == 0;
}

From source file:Main.java

private static String guessAppropriateEncoding(CharSequence contents) {
    // Very crude at the moment
    for (int i = 0; i < contents.length(); i++) {
        if (contents.charAt(i) > 0xFF) {
            return "UTF-8";
        }/*from  w  w  w.  j  a  va 2 s . c  om*/
    }
    return null;
}

From source file:Main.java

public static boolean validUTF16String(CharSequence s) {
    final int size = s.length();
    for (int i = 0; i < size; i++) {
        char ch = s.charAt(i);
        if (ch >= UNI_SUR_HIGH_START && ch <= UNI_SUR_HIGH_END) {
            if (i < size - 1) {
                i++;// ww w. j  ava  2s.com
                char nextCH = s.charAt(i);
                if (nextCH >= UNI_SUR_LOW_START && nextCH <= UNI_SUR_LOW_END) {
                    // Valid surrogate pair
                } else
                    // Unmatched high surrogate
                    return false;
            } else
                // Unmatched high surrogate
                return false;
        } else if (ch >= UNI_SUR_LOW_START && ch <= UNI_SUR_LOW_END)
            // Unmatched low surrogate
            return false;
    }

    return true;
}

From source file:Main.java

public static long calculateWeiboLength(CharSequence c) {

    double len = 0;
    for (int i = 0; i < c.length(); i++) {
        int temp = (int) c.charAt(i);
        if (temp > 0 && temp < 127) {
            len += 0.5;/*from w  ww.j a  v a2  s.  c om*/
        } else {
            len++;
        }
    }
    return Math.round(len);
}

From source file:Main.java

/**
 * is null or its length is 0//  www  . j  ava2  s .  com
 *
 * <pre>
 * isEmpty(null) = true;
 * isEmpty(&quot;&quot;) = true;
 * isEmpty(&quot;  &quot;) = false;
 * </pre>
 *
 * @param str
 * @return if string is null or its size is 0, return true, else return false.
 */
public static boolean isEmpty(CharSequence str) {
    return (str == null || str.length() == 0);
}

From source file:Main.java

/**
 * get length of CharSequence/* ww w .java2s.co m*/
 *
 * <pre>
 * length(null) = 0;
 * length(\"\") = 0;
 * length(\"abc\") = 3;
 * </pre>
 *
 * @param str
 * @return if str is null or empty, return 0, else return {@link CharSequence#length()}.
 */
public static int length(CharSequence str) {
    return str == null ? 0 : str.length();
}

From source file:Main.java

/**
 * <p>Checks if a CharSequence is whitespace, empty ("") or null.</p>
 *
 * <pre>/*from   ww  w.  j a  va2 s.  co  m*/
 * StringUtils.isBlank(null)      = true
 * StringUtils.isBlank("")        = true
 * StringUtils.isBlank(" ")       = true
 * StringUtils.isBlank("bob")     = false
 * StringUtils.isBlank("  bob  ") = false
 * </pre>
 *
 * @param cs  the CharSequence to check, may be null
 * @return {@code true} if the CharSequence is null, empty or whitespace
 * @since 2.0
 * @since 3.0 Changed signature from isBlank(String) to isBlank(CharSequence)
 */
public static boolean isBlank(CharSequence cs) {
    int strLen;
    if (cs == null || (strLen = cs.length()) == 0) {
        return true;
    }
    for (int i = 0; i < strLen; i++) {
        if (Character.isWhitespace(cs.charAt(i)) == false) {
            return false;
        }
    }
    return true;
}

From source file:Main.java

public static CharSequence trimTrailingWhitespace(CharSequence source) {

    if (source == null)
        return "";

    int i = source.length();

    // loop back to the first non-whitespace character
    while (--i >= 0 && Character.isWhitespace(source.charAt(i))) {
    }/*from  ww  w  . j a va 2s .  c  o m*/

    return source.subSequence(0, i + 1);
}

From source file:Main.java

public static int length(CharSequence str) {
    if (str == null) {
        return 0;
    } else {//  w w w . j  a  va  2 s.  c  o  m
        return str.length();
    }
}

From source file:Main.java

/**
 * Checks whether the character present at the index of the CharSequence is a flagged character.
 * @param text - input text.// www.  j  a v a2s .  c om
 * @param index - index to check.
 * @return true if the character is flagged, false otherwise.
 */
public static boolean isFlagged(CharSequence text, int index) {
    if (index > INVALID_INDEX && index < text.length()) {
        char c = text.charAt(index);
        return c == SPACE || c == NEW_LINE || c == BOLD_FLAG || c == ITALIC_FLAG || c == STRIKE_FLAG;
    }
    return true;
}