import quincy 17.2.0

[ceph.git] / ceph / src / arrow / java / adapter / jdbc / src / main / java / org / apache / arrow / adapter / jdbc / consumer / BlobConsumer.java

diff --git a/ceph/src/arrow/java/adapter/jdbc/src/main/java/org/apache/arrow/adapter/jdbc/consumer/BlobConsumer.java b/ceph/src/arrow/java/adapter/jdbc/src/main/java/org/apache/arrow/adapter/jdbc/consumer/BlobConsumer.java
new file mode 100644 (file)
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+++ b/ceph/src/arrow/java/adapter/jdbc/src/main/java/org/apache/arrow/adapter/jdbc/consumer/BlobConsumer.java
@@ -0,0 +1,72 @@
+/*
+ * 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.arrow.adapter.jdbc.consumer;
+
+import java.io.IOException;
+import java.sql.Blob;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+
+import org.apache.arrow.vector.VarBinaryVector;
+
+/**
+ * Consumer which consume blob type values from {@link ResultSet}.
+ * Write the data to {@link VarBinaryVector}.
+ */
+public class BlobConsumer extends BaseConsumer<VarBinaryVector> {
+
+  private BinaryConsumer delegate;
+
+  private final boolean nullable;
+
+  /**
+   * Creates a consumer for {@link VarBinaryVector}.
+   */
+  public static BlobConsumer createConsumer(
+          BinaryConsumer delegate, int index, boolean nullable) {
+    return new BlobConsumer(delegate, index, nullable);
+  }
+
+  /**
+   * Instantiate a BlobConsumer.
+   */
+  public BlobConsumer(BinaryConsumer delegate, int index, boolean nullable) {
+    super(null, index);
+    this.delegate = delegate;
+    this.nullable = nullable;
+  }
+
+  @Override
+  public void consume(ResultSet resultSet) throws SQLException, IOException {
+    Blob blob = resultSet.getBlob(columnIndexInResultSet);
+    if (blob != null) {
+      delegate.consume(blob.getBinaryStream());
+    }
+    delegate.moveWriterPosition();
+  }
+
+  @Override
+  public void close() throws Exception {
+    delegate.close();
+  }
+
+  @Override
+  public void resetValueVector(VarBinaryVector vector) {
+    delegate = BinaryConsumer.createConsumer(vector, columnIndexInResultSet, nullable);
+  }
+}