s1ck commented on a change in pull request #24851: [SPARK-27303][GRAPH] Add 
Spark Graph API
URL: https://github.com/apache/spark/pull/24851#discussion_r333374185
 
 

 ##########
 File path: 
graph/api/src/main/scala/org/apache/spark/graph/api/PropertyGraphWriter.scala
 ##########
 @@ -0,0 +1,92 @@
+/*
+ * 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.spark.graph.api
+
+import java.util.Locale
+
+import org.apache.spark.sql.SaveMode
+
+abstract class PropertyGraphWriter(val graph: PropertyGraph) {
+
+  protected var saveMode: SaveMode = SaveMode.ErrorIfExists
+  protected var format: String =
+    graph.cypherSession.sparkSession.sessionState.conf.defaultDataSourceName
+
+  /**
+   * Specifies the behavior when the graph already exists. Options include:
+   * <ul>
+   * <li>`SaveMode.Overwrite`: overwrite the existing data.</li>
+   * <li>`SaveMode.Ignore`: ignore the operation (i.e. no-op).</li>
+   * <li>`SaveMode.ErrorIfExists`: throw an exception at runtime.</li>
+   * </ul>
+   * <p>
+   * When writing the default option is `ErrorIfExists`.
+   *
+   * @since 3.0.0
+   */
+  def mode(mode: SaveMode): PropertyGraphWriter = {
+    mode match {
+      case SaveMode.Append =>
+        throw new IllegalArgumentException(s"Unsupported save mode: $mode. " +
+          "Accepted save modes are 'overwrite', 'ignore', 'error', 
'errorifexists'.")
+      case _ =>
+        this.saveMode = mode
+    }
+    this
+  }
+
+  /**
+   * Specifies the behavior when the graph already exists. Options include:
+   * <ul>
+   * <li>`overwrite`: overwrite the existing graph.</li>
+   * <li>`ignore`: ignore the operation (i.e. no-op).</li>
+   * <li>`error` or `errorifexists`: default option, throw an exception at 
runtime.</li>
+   * </ul>
+   *
+   * @since 3.0.0
+   */
+  def mode(saveMode: String): PropertyGraphWriter = {
+    saveMode.toLowerCase(Locale.ROOT) match {
+      case "overwrite" => mode(SaveMode.Overwrite)
+      case "ignore" => mode(SaveMode.Ignore)
+      case "error" | "errorifexists" => mode(SaveMode.ErrorIfExists)
+      case "default" => this
 
 Review comment:
   Makes sense. It was a copy paste error from the `DataFrameWriter`: 
https://github.com/apache/spark/blob/c8159c7941f51caf3d420c8ad8599b869fc56a08/sql/core/src/main/scala/org/apache/spark/sql/DataFrameWriter.scala#L91
   
   Maybe somebody should fix that too ;)

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