import quincy 17.2.0

[ceph.git] / ceph / src / arrow / java / vector / src / main / java / org / apache / arrow / vector / ZeroVector.java

diff --git a/ceph/src/arrow/java/vector/src/main/java/org/apache/arrow/vector/ZeroVector.java b/ceph/src/arrow/java/vector/src/main/java/org/apache/arrow/vector/ZeroVector.java
new file mode 100644 (file)
index 0000000..079b5c1
--- /dev/null
+++ b/ceph/src/arrow/java/vector/src/main/java/org/apache/arrow/vector/ZeroVector.java
@@ -0,0 +1,138 @@
+/*
+ * 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;
+
+import org.apache.arrow.memory.BufferAllocator;
+import org.apache.arrow.memory.util.ArrowBufPointer;
+import org.apache.arrow.memory.util.hash.ArrowBufHasher;
+import org.apache.arrow.vector.types.pojo.Field;
+import org.apache.arrow.vector.types.pojo.FieldType;
+import org.apache.arrow.vector.util.CallBack;
+import org.apache.arrow.vector.util.TransferPair;
+
+/**
+ * A zero length vector of any type.
+ */
+public final class ZeroVector extends NullVector {
+  public static final ZeroVector INSTANCE = new ZeroVector();
+
+  /**
+   * Instantiate a ZeroVector.
+   *
+   * @param name name of the vector
+   */
+  public ZeroVector(String name) {
+    super(name);
+  }
+
+  /**
+   * Instantiate a ZeroVector.
+   *
+   * @param name      name of the vector
+   * @param fieldType type of Field materialized by this vector.
+   */
+  public ZeroVector(String name, FieldType fieldType) {
+    super(name, fieldType);
+  }
+
+  /**
+   * Instantiate a ZeroVector.
+   *
+   * @param field field materialized by this vector.
+   */
+  public ZeroVector(Field field) {
+    super(field);
+  }
+
+  @Deprecated
+  public ZeroVector() {
+  }
+
+  @Override
+  public int getValueCount() {
+    return 0;
+  }
+
+  @Override
+  public void setValueCount(int valueCount) {
+  }
+
+  @Override
+  public int getNullCount() {
+    return 0;
+  }
+
+  @Override
+  public boolean isNull(int index) {
+    throw new IndexOutOfBoundsException();
+  }
+
+  @Override
+  public int hashCode(int index) {
+    return 0;
+  }
+
+  @Override
+  public int hashCode(int index, ArrowBufHasher hasher) {
+    return ArrowBufPointer.NULL_HASH_CODE;
+  }
+
+  @Override
+  public int getValueCapacity() {
+    return 0;
+  }
+
+  @Override
+  public TransferPair getTransferPair(BufferAllocator allocator) {
+    return defaultPair;
+  }
+
+  @Override
+  public TransferPair getTransferPair(String ref, BufferAllocator allocator) {
+    return defaultPair;
+  }
+
+  @Override
+  public TransferPair getTransferPair(String ref, BufferAllocator allocator, CallBack callBack) {
+    return defaultPair;
+  }
+
+  @Override
+  public TransferPair makeTransferPair(ValueVector target) {
+    return defaultPair;
+  }
+
+  private final TransferPair defaultPair = new TransferPair() {
+    @Override
+    public void transfer() {
+    }
+
+    @Override
+    public void splitAndTransfer(int startIndex, int length) {
+    }
+
+    @Override
+    public ValueVector getTo() {
+      return ZeroVector.this;
+    }
+
+    @Override
+    public void copyValueSafe(int from, int to) {
+    }
+  };
+}