bugfix: return empty element array when get array property

apollo-common/src/main/java/com/ctrip/framework/apollo/common/config/RefreshableConfig.java

@@ -5,6 +5,7 @@ import com.google.common.base.Splitter;
 import com.ctrip.framework.apollo.core.utils.ApolloThreadFactory;
 import com.ctrip.framework.apollo.tracer.Tracer;
 
+import com.google.common.base.Strings;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.springframework.beans.factory.annotation.Autowired;
@@ -90,13 +91,13 @@ public abstract class RefreshableConfig {
     }
   }
 
-  public String[] getArrayProperty(String key, String defaultValue) {
+  public String[] getArrayProperty(String key, String[] defaultValue) {
     try {
-      String configuration = getValue(key, defaultValue);
-      return configuration.split(LIST_SEPARATOR);
+      String value = getValue(key);
+      return Strings.isNullOrEmpty(value) ? defaultValue : value.split(LIST_SEPARATOR);
     } catch (Exception e) {
       Tracer.logError("Get array property failed.", e);
-      return defaultValue.split(LIST_SEPARATOR);
+      return defaultValue;
     }
   }
 

apollo-portal/src/main/java/com/ctrip/framework/apollo/portal/components/config/PortalConfig.java

@@ -43,10 +43,10 @@ public class PortalConfig extends RefreshableConfig {
    * Level: important
    **/
   public List<Env> portalSupportedEnvs() {
-    String[] configuration = getArrayProperty("apollo.portal.envs", "FAT,UAT,PRO");
+    String[] configurations = getArrayProperty("apollo.portal.envs", new String[]{"FAT", "UAT", "PRO"});
     List<Env> envs = Lists.newLinkedList();
 
-    for (String env : configuration) {
+    for (String env : configurations) {
       envs.add(Env.fromString(env));
     }
 
@@ -62,10 +62,10 @@ public class PortalConfig extends RefreshableConfig {
   }
 
   public Set<Env> emailSupportedEnvs() {
-    String[] configurations = getArrayProperty("email.supported.envs", "");
+    String[] configurations = getArrayProperty("email.supported.envs", null);
 
     Set<Env> result = Sets.newHashSet();
-    if (StringUtils.isEmpty(configurations)) {
+    if (configurations == null || configurations.length == 0) {
       return result;
     }
 

apollo-portal/src/test/java/com/ctrip/framework/apollo/portal/config/ConfigTest.java

@@ -39,7 +39,7 @@ public class ConfigTest {
 
     when(environment.getProperty(testKey)).thenReturn(testValue);
 
-    String[] result = config.getArrayProperty(testKey, "");
+    String[] result = config.getArrayProperty(testKey, null);
 
     Assert.assertEquals(3, result.length);
     Assert.assertEquals("a", result[0]);