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new b8f9d0e [HUDI-615]: Add some methods and test cases for StringUtils.
(#1338)
b8f9d0e is described below
commit b8f9d0ec4548a2487914c4cc982fc5e1f4e0c88c
Author: Suneel Marthi <[email protected]>
AuthorDate: Mon Feb 17 01:13:33 2020 -0500
[HUDI-615]: Add some methods and test cases for StringUtils. (#1338)
---
.../org/apache/hudi/common/util/StringUtils.java | 27 +++++++++
.../apache/hudi/common/util/TestStringUtils.java | 64 ++++++++++++++++++++++
2 files changed, 91 insertions(+)
diff --git
a/hudi-common/src/main/java/org/apache/hudi/common/util/StringUtils.java
b/hudi-common/src/main/java/org/apache/hudi/common/util/StringUtils.java
index 63f02fe..d1e3305 100644
--- a/hudi-common/src/main/java/org/apache/hudi/common/util/StringUtils.java
+++ b/hudi-common/src/main/java/org/apache/hudi/common/util/StringUtils.java
@@ -18,6 +18,8 @@
package org.apache.hudi.common.util;
+import javax.annotation.Nullable;
+
/**
* Simple utility for operations on strings.
*/
@@ -67,4 +69,29 @@ public class StringUtils {
public static boolean isNullOrEmpty(String str) {
return str == null || str.length() == 0;
}
+
+
+ /**
+ * Returns the given string if it is non-null; the empty string otherwise.
+ *
+ * @param string the string to test and possibly return
+ * @return {@code string} itself if it is non-null; {@code ""} if it is null
+ */
+ public static String nullToEmpty(@Nullable String string) {
+ return string == null ? "" : string;
+ }
+
+ /**
+ * Returns the given string if it is nonempty; {@code null} otherwise.
+ *
+ * @param string the string to test and possibly return
+ * @return {@code string} itself if it is nonempty; {@code null} if it is
empty or null
+ */
+ public static @Nullable String emptyToNull(@Nullable String string) {
+ return stringIsNullOrEmpty(string) ? null : string;
+ }
+
+ private static boolean stringIsNullOrEmpty(@Nullable String string) {
+ return string == null || string.isEmpty();
+ }
}
diff --git
a/hudi-common/src/test/java/org/apache/hudi/common/util/TestStringUtils.java
b/hudi-common/src/test/java/org/apache/hudi/common/util/TestStringUtils.java
new file mode 100644
index 0000000..05a0825
--- /dev/null
+++ b/hudi-common/src/test/java/org/apache/hudi/common/util/TestStringUtils.java
@@ -0,0 +1,64 @@
+/*
+ * 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
+ *
+ * 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 org.apache.hudi.common.util;
+
+import org.junit.Test;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotEquals;
+import static org.junit.Assert.assertNull;
+import static org.junit.Assert.assertTrue;
+
+public class TestStringUtils {
+
+ private static final String[] STRINGS = {"This", "is", "a", "test"};
+
+ @Test
+ public void testStringJoinWithDelim() {
+ String joinedString = StringUtils.joinUsingDelim("-", STRINGS);
+ assertEquals(STRINGS.length, joinedString.split("-").length);
+ }
+
+ @Test
+ public void testStringJoin() {
+ assertNotEquals(null, StringUtils.join(""));
+ assertNotEquals(null, StringUtils.join(STRINGS));
+ }
+
+ @Test
+ public void testStringNullToEmpty() {
+ String str = "This is a test";
+ assertEquals(str, StringUtils.nullToEmpty(str));
+ assertEquals("", StringUtils.nullToEmpty(null));
+ }
+
+ @Test
+ public void testStringEmptyToNull() {
+ assertNull(StringUtils.emptyToNull(""));
+ assertEquals("Test String", StringUtils.emptyToNull("Test String"));
+ }
+
+ @Test
+ public void testStringNullOrEmpty() {
+ assertTrue(StringUtils.isNullOrEmpty(null));
+ assertTrue(StringUtils.isNullOrEmpty(""));
+ assertNotEquals(null, StringUtils.isNullOrEmpty("this is not empty"));
+ assertTrue(StringUtils.isNullOrEmpty(""));
+ }
+}
