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Add StringUtils.joinCommaSplittableText

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Change-Id: I80ad9d8b5aee53f1403486a56ffae8d09cbd4e28
This commit is contained in:
Tadashi G. Takaoka 2013-11-14 14:23:12 +09:00
parent c3a4c075c9
commit 6589751ace
2 changed files with 46 additions and 7 deletions
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26
java/src/com/android/inputmethod/latin/utils/StringUtils.java
View file

@ -39,6 +39,8 @@ public final class StringUtils {
public static final int CAPITALIZE_FIRST = 1; // First only
public static final int CAPITALIZE_ALL = 2; // All caps
private static final String EMPTY_STRING = "";
private StringUtils() {
// This utility class is not publicly instantiable.
}
@ -80,6 +82,22 @@ public final class StringUtils {
return containsInArray(text, extraValues.split(SEPARATOR_FOR_COMMA_SPLITTABLE_TEXT));
}
// Remove @UsedForTesting annotation once this method is used in the production code.
@UsedForTesting
public static String joinCommaSplittableText(final String head, final String tail) {
if (TextUtils.isEmpty(head) && TextUtils.isEmpty(tail)) {
return EMPTY_STRING;
}
// Here either head or tail is not null.
if (TextUtils.isEmpty(head)) {
return tail;
}
if (TextUtils.isEmpty(tail)) {
return head;
}
return head + SEPARATOR_FOR_COMMA_SPLITTABLE_TEXT + tail;
}
public static String appendToCommaSplittableTextIfNotExists(final String text,
final String extraValues) {
if (TextUtils.isEmpty(extraValues)) {
@ -94,7 +112,7 @@ public final class StringUtils {
public static String removeFromCommaSplittableTextIfExists(final String text,
final String extraValues) {
if (TextUtils.isEmpty(extraValues)) {
return "";
return EMPTY_STRING;
}
final String[] elements = extraValues.split(SEPARATOR_FOR_COMMA_SPLITTABLE_TEXT);
if (!containsInArray(text, elements)) {
@ -380,7 +398,7 @@ public final class StringUtils {
@UsedForTesting
public static String byteArrayToHexString(byte[] bytes) {
if (bytes == null || bytes.length == 0) {
return "";
return EMPTY_STRING;
}
final StringBuilder sb = new StringBuilder();
for (byte b : bytes) {
@ -444,7 +462,7 @@ public final class StringUtils {
public static String listToJsonStr(List<Object> list) {
if (list == null || list.isEmpty()) {
return "";
return EMPTY_STRING;
}
final StringWriter sw = new StringWriter();
final JsonWriter writer = new JsonWriter(sw);
@ -470,6 +488,6 @@ public final class StringUtils {
} catch (IOException e) {
}
}
return "";
return EMPTY_STRING;
}
}

27
tests/src/com/android/inputmethod/latin/utils/StringUtilsTests.java
View file

@ -44,7 +44,7 @@ public class StringUtilsTests extends AndroidTestCase {
}));
}
public void testContainsInExtraValues() {
public void testContainsInCommaSplittableText() {
assertFalse("null", StringUtils.containsInCommaSplittableText("key", null));
assertFalse("empty", StringUtils.containsInCommaSplittableText("key", ""));
assertFalse("not in 1 element",
@ -56,7 +56,28 @@ public class StringUtilsTests extends AndroidTestCase {
assertTrue("in 2 elements", StringUtils.containsInCommaSplittableText("key", "key1,key"));
}
public void testAppendToExtraValuesIfNotExists() {
public void testJoinCommaSplittableText() {
assertEquals("2 nulls", "",
StringUtils.joinCommaSplittableText(null, null));
assertEquals("null and empty", "",
StringUtils.joinCommaSplittableText(null, ""));
assertEquals("empty and null", "",
StringUtils.joinCommaSplittableText("", null));
assertEquals("2 empties", "",
StringUtils.joinCommaSplittableText("", ""));
assertEquals("text and null", "text",
StringUtils.joinCommaSplittableText("text", null));
assertEquals("text and empty", "text",
StringUtils.joinCommaSplittableText("text", ""));
assertEquals("null and text", "text",
StringUtils.joinCommaSplittableText(null, "text"));
assertEquals("empty and text", "text",
StringUtils.joinCommaSplittableText("", "text"));
assertEquals("2 texts", "text1,text2",
StringUtils.joinCommaSplittableText("text1", "text2"));
}
public void testAppendToCommaSplittableTextIfNotExists() {
assertEquals("null", "key",
StringUtils.appendToCommaSplittableTextIfNotExists("key", null));
assertEquals("empty", "key",
@ -77,7 +98,7 @@ public class StringUtilsTests extends AndroidTestCase {
StringUtils.appendToCommaSplittableTextIfNotExists("key", "key1,key,key3"));
}
public void testRemoveFromExtraValuesIfExists() {
public void testRemoveFromCommaSplittableTextIfExists() {
assertEquals("null", "", StringUtils.removeFromCommaSplittableTextIfExists("key", null));
assertEquals("empty", "", StringUtils.removeFromCommaSplittableTextIfExists("key", ""));