[HUDI-3730] Improve meta sync class design and hierarchies (#5854)

* [HUDI-3730] Improve meta sync class design and hierarchies (#5754)
* Implements class design proposed in RFC-55

Co-authored-by: jian.feng <fengjian428@gmial.com>
Co-authored-by: jian.feng <jian.feng@shopee.com>

hudi-common/src/main/java/org/apache/hudi/common/config/HoodieConfig.java

@@ -21,6 +21,7 @@ package org.apache.hudi.common.config;
 import org.apache.hadoop.fs.FSDataInputStream;
 import org.apache.hudi.common.util.Option;
 import org.apache.hudi.common.util.ReflectionUtils;
+import org.apache.hudi.common.util.StringUtils;
 import org.apache.hudi.exception.HoodieException;
 import org.apache.log4j.LogManager;
 import org.apache.log4j.Logger;
@@ -29,6 +30,7 @@ import java.io.IOException;
 import java.io.Serializable;
 import java.lang.reflect.Modifier;
 import java.util.Arrays;
+import java.util.List;
 import java.util.Properties;
 
 /**
@@ -133,6 +135,14 @@ public class HoodieConfig implements Serializable {
     return rawValue.map(Object::toString).orElse(null);
   }
 
+  public <T> List<String> getSplitStrings(ConfigProperty<T> configProperty) {
+    return getSplitStrings(configProperty, ",");
+  }
+
+  public <T> List<String> getSplitStrings(ConfigProperty<T> configProperty, String delimiter) {
+    return StringUtils.split(getString(configProperty), delimiter);
+  }
+
   public String getString(String key) {
     return props.getProperty(key);
   }

hudi-common/src/main/java/org/apache/hudi/common/config/TypedProperties.java

@@ -49,6 +49,12 @@ public class TypedProperties extends Properties implements Serializable {
     }
   }
 
+  public void setPropertyIfNonNull(String key, Object value) {
+    if (value != null) {
+      setProperty(key, value.toString());
+    }
+  }
+
   @Override
   public String getProperty(String key) {
     Object oval = super.get(key);

hudi-common/src/main/java/org/apache/hudi/common/util/StringUtils.java

@@ -19,6 +19,7 @@
 package org.apache.hudi.common.util;
 
 import javax.annotation.Nullable;
+
 import java.nio.ByteBuffer;
 import java.util.Collections;
 import java.util.List;
@@ -65,6 +66,18 @@ public class StringUtils {
     return org.apache.hadoop.util.StringUtils.join(separator, array);
   }
 
+  /**
+   * Wrapper of {@link java.lang.String#join(CharSequence, Iterable)}.
+   *
+   * Allow return {@code null} when {@code Iterable} is {@code null}.
+   */
+  public static String join(CharSequence delimiter, Iterable<? extends CharSequence> elements) {
+    if (elements == null) {
+      return null;
+    }
+    return String.join(delimiter, elements);
+  }
+
   public static String toHexString(byte[] bytes) {
     StringBuilder sb = new StringBuilder(bytes.length * 2);
     for (byte b : bytes) {
@@ -77,6 +90,9 @@ public class StringUtils {
     return str == null || str.length() == 0;
   }
 
+  public static boolean nonEmpty(String str) {
+    return !isNullOrEmpty(str);
+  }
 
   /**
    * Returns the given string if it is non-null; the empty string otherwise.

hudi-common/src/test/java/org/apache/hudi/common/util/TestStringUtils.java

@@ -23,6 +23,7 @@ import org.junit.jupiter.api.Test;
 import java.nio.ByteBuffer;
 import java.util.ArrayList;
 import java.util.Arrays;
+import java.util.Collections;
 
 import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertNotEquals;
@@ -45,6 +46,14 @@ public class TestStringUtils {
     assertNotEquals(null, StringUtils.join(STRINGS));
   }
 
+  @Test
+  public void testStringJoinWithJavaImpl() {
+    assertNull(StringUtils.join(",", null));
+    assertEquals("", String.join(",", Collections.singletonList("")));
+    assertEquals(",", String.join(",", Arrays.asList("", "")));
+    assertEquals("a,", String.join(",", Arrays.asList("a", "")));
+  }
+
   @Test
   public void testStringNullToEmpty() {
     String str = "This is a test";