import quincy 17.2.0

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

diff --git a/ceph/src/arrow/java/vector/src/main/java/org/apache/arrow/vector/dictionary/Dictionary.java b/ceph/src/arrow/java/vector/src/main/java/org/apache/arrow/vector/dictionary/Dictionary.java
new file mode 100644 (file)
index 0000000..6f40e58
--- /dev/null
+++ b/ceph/src/arrow/java/vector/src/main/java/org/apache/arrow/vector/dictionary/Dictionary.java
@@ -0,0 +1,75 @@
+/*
+ * 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.dictionary;
+
+import java.util.Objects;
+
+import org.apache.arrow.vector.FieldVector;
+import org.apache.arrow.vector.compare.VectorEqualsVisitor;
+import org.apache.arrow.vector.types.pojo.ArrowType;
+import org.apache.arrow.vector.types.pojo.DictionaryEncoding;
+
+/**
+ * A dictionary (integer to Value mapping) that is used to facilitate
+ * dictionary encoding compression.
+ */
+public class Dictionary {
+
+  private final DictionaryEncoding encoding;
+  private final FieldVector dictionary;
+
+  public Dictionary(FieldVector dictionary, DictionaryEncoding encoding) {
+    this.dictionary = dictionary;
+    this.encoding = encoding;
+  }
+
+  public FieldVector getVector() {
+    return dictionary;
+  }
+
+  public DictionaryEncoding getEncoding() {
+    return encoding;
+  }
+
+  public ArrowType getVectorType() {
+    return dictionary.getField().getType();
+  }
+
+  @Override
+  public String toString() {
+    return "Dictionary " + encoding + " " + dictionary;
+  }
+
+  @Override
+  public boolean equals(Object o) {
+    if (this == o) {
+      return true;
+    }
+    if (o == null || getClass() != o.getClass()) {
+      return false;
+    }
+    Dictionary that = (Dictionary) o;
+    return Objects.equals(encoding, that.encoding) &&
+        new VectorEqualsVisitor().vectorEquals(that.dictionary, dictionary);
+  }
+
+  @Override
+  public int hashCode() {
+    return Objects.hash(encoding, dictionary);
+  }
+}