Added checks for empty table names. (#54)

Author: connelly38

driver/src/main/java/oracle/nosql/driver/ops/GetIndexesRequest.java

@@ -128,7 +128,7 @@ public GetIndexesRequest setNamespace(String namespace) {
      */
     @Override
     public void validate() {
-        if (tableName == null) {
+        if (tableName == null || tableName.isEmpty()) {
             throw new IllegalArgumentException(
                 "GetIndexesRequest requires a table name");
         }

driver/src/main/java/oracle/nosql/driver/ops/GetTableRequest.java

@@ -131,7 +131,7 @@ public GetTableRequest setNamespace(String namespace) {
      */
     @Override
     public void validate() {
-        if (tableName == null) {
+        if (tableName == null || tableName.isEmpty()) {
             throw new IllegalArgumentException(
                 "GetTableRequest requires a table name");
         }

driver/src/main/java/oracle/nosql/driver/ops/MultiDeleteRequest.java

@@ -258,7 +258,7 @@ public String getTypeName() {
      */
     @Override
     public void validate() {
-        if (tableName == null) {
+        if (tableName == null || tableName.isEmpty()) {
             throw new IllegalArgumentException(
             ("MultiDeleteRequest requires table name"));
         }

driver/src/main/java/oracle/nosql/driver/ops/ReadRequest.java

@@ -53,7 +53,7 @@ public Request setDefaults(NoSQLHandleConfig config) {
     }
 
     protected void validateReadRequest(String requestName) {
-        if (tableName == null) {
+        if (tableName == null || tableName.isEmpty()) {
             throw new IllegalArgumentException(
                 (requestName +
                  " requires table name"));

driver/src/main/java/oracle/nosql/driver/ops/TableRequest.java

@@ -286,7 +286,7 @@ public TableRequest setDefaults(NoSQLHandleConfig config) {
 
     @Override
     public  void validate() {
-        if (statement == null && tableName == null) {
+        if (statement == null && (tableName == null || tableName.isEmpty())) {
             throw new IllegalArgumentException(
                 "TableRequest requires statement or TableLimits and name");
         }

driver/src/main/java/oracle/nosql/driver/ops/TableUsageRequest.java

@@ -257,7 +257,7 @@ public TableUsageRequest setTimeout(int timeoutMs) {
      */
     @Override
     public void validate() {
-        if (tableName == null) {
+        if (tableName == null || tableName.isEmpty()) {
             throw new IllegalArgumentException(
                 "TableUsageRequest requires a table name");
         }

driver/src/main/java/oracle/nosql/driver/ops/WriteRequest.java

@@ -44,7 +44,7 @@ public Request setDefaults(NoSQLHandleConfig config) {
     }
 
     protected void validateWriteRequest(String requestName) {
-        if (tableName == null) {
+        if (tableName == null || tableName.isEmpty()) {
             throw new IllegalArgumentException(
                 (requestName +
                  " requires table name"));