import quincy 17.2.0

[ceph.git] / ceph / src / arrow / java / vector / src / main / java / org / apache / arrow / vector / complex / impl / UnionMapReader.java

diff --git a/ceph/src/arrow/java/vector/src/main/java/org/apache/arrow/vector/complex/impl/UnionMapReader.java b/ceph/src/arrow/java/vector/src/main/java/org/apache/arrow/vector/complex/impl/UnionMapReader.java
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--- /dev/null
+++ b/ceph/src/arrow/java/vector/src/main/java/org/apache/arrow/vector/complex/impl/UnionMapReader.java
@@ -0,0 +1,77 @@
+/*
+ * 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.vector.complex.impl;
+
+import org.apache.arrow.vector.complex.MapVector;
+import org.apache.arrow.vector.complex.reader.FieldReader;
+import org.apache.arrow.vector.types.Types.MinorType;
+
+/**
+ * Reader for a MapVector.
+ */
+public class UnionMapReader extends UnionListReader {
+
+  private String keyName = MapVector.KEY_NAME;
+  private String valueName = MapVector.VALUE_NAME;
+
+  /**
+   * Construct a new reader for the given vector.
+   *
+   * @param vector Vector to read from.
+   */
+  public UnionMapReader(MapVector vector) {
+    super(vector);
+  }
+
+  /**
+   * Set the key, value field names to read.
+   *
+   * @param key Field name for key.
+   * @param value Field name for value.
+   */
+  public void setKeyValueNames(String key, String value) {
+    keyName = key;
+    valueName = value;
+  }
+
+  /**
+   * Start reading a key from the map entry.
+   *
+   * @return reader that can be used to read the key.
+   */
+  public FieldReader key() {
+    return reader().reader(keyName);
+  }
+
+  /**
+   * Start reading a value element from the map entry.
+   *
+   * @return reader that can be used to read the value.
+   */
+  public FieldReader value() {
+    return reader().reader(valueName);
+  }
+
+  /**
+   * Return the MinorType of the reader as MAP.
+   */
+  @Override
+  public MinorType getMinorType() {
+    return MinorType.MAP;
+  }
+}