108 lines
3.5 KiB
Java
108 lines
3.5 KiB
Java
/*
|
|
* Copyright (C) 2013 The Android Open Source Project
|
|
*
|
|
* Licensed 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.
|
|
*/
|
|
|
|
package android.text;
|
|
|
|
public class TextUtils {
|
|
private TextUtils() { /* cannot be instantiated */ }
|
|
|
|
/**
|
|
* Returns true if the string is null or 0-length.
|
|
* @param str the string to be examined
|
|
* @return true if str is null or zero length
|
|
*/
|
|
public static boolean isEmpty(CharSequence str) {
|
|
if (str == null || str.length() == 0)
|
|
return true;
|
|
else
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Returns true if a and b are equal, including if they are both null.
|
|
* <p><i>Note: In platform versions 1.1 and earlier, this method only worked well if
|
|
* both the arguments were instances of String.</i></p>
|
|
* @param a first CharSequence to check
|
|
* @param b second CharSequence to check
|
|
* @return true if a and b are equal
|
|
*/
|
|
public static boolean equals(CharSequence a, CharSequence b) {
|
|
if (a == b) return true;
|
|
int length;
|
|
if (a != null && b != null && (length = a.length()) == b.length()) {
|
|
if (a instanceof String && b instanceof String) {
|
|
return a.equals(b);
|
|
} else {
|
|
for (int i = 0; i < length; i++) {
|
|
if (a.charAt(i) != b.charAt(i)) return false;
|
|
}
|
|
return true;
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Returns list of multiple {@link CharSequence} joined into a single
|
|
* {@link CharSequence} separated by localized delimiter such as ", ".
|
|
*
|
|
* @hide
|
|
*/
|
|
public static CharSequence join(Iterable<CharSequence> list) {
|
|
final CharSequence delimiter = ", ";
|
|
return join(delimiter, list);
|
|
}
|
|
|
|
/**
|
|
* Returns a string containing the tokens joined by delimiters.
|
|
* @param tokens an array objects to be joined. Strings will be formed from
|
|
* the objects by calling object.toString().
|
|
*/
|
|
public static String join(CharSequence delimiter, Object[] tokens) {
|
|
StringBuilder sb = new StringBuilder();
|
|
boolean firstTime = true;
|
|
for (Object token: tokens) {
|
|
if (firstTime) {
|
|
firstTime = false;
|
|
} else {
|
|
sb.append(delimiter);
|
|
}
|
|
sb.append(token);
|
|
}
|
|
return sb.toString();
|
|
}
|
|
|
|
/**
|
|
* Returns a string containing the tokens joined by delimiters.
|
|
* @param tokens an array objects to be joined. Strings will be formed from
|
|
* the objects by calling object.toString().
|
|
*/
|
|
public static String join(CharSequence delimiter, Iterable tokens) {
|
|
StringBuilder sb = new StringBuilder();
|
|
boolean firstTime = true;
|
|
for (Object token: tokens) {
|
|
if (firstTime) {
|
|
firstTime = false;
|
|
} else {
|
|
sb.append(delimiter);
|
|
}
|
|
sb.append(token);
|
|
}
|
|
return sb.toString();
|
|
}
|
|
|
|
}
|