Class to give out Avro compression codecs

Author: martin-traverse

adapter/avro/src/main/java/org/apache/arrow/adapter/avro/AvroCompression.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.adapter.avro;
+
+import org.apache.avro.file.*;
+
+import java.nio.ByteBuffer;
+
+
+public class AvroCompression {
+
+  public static Codec getAvroCodec(String codecName) {
+
+    if (codecName == null || DataFileConstants.NULL_CODEC.equals(codecName)) {
+      return new NullCodec();
+    }
+
+    switch (codecName) {
+      case DataFileConstants.DEFLATE_CODEC:
+        return new DeflateCodec(CodecFactory.DEFAULT_DEFLATE_LEVEL);
+      case DataFileConstants.BZIP2_CODEC:
+        return new BZip2Codec();
+      case DataFileConstants.XZ_CODEC:
+        return new XZCodec(CodecFactory.DEFAULT_XZ_LEVEL);
+      case DataFileConstants.ZSTANDARD_CODEC:
+        return new ZstandardCodec(CodecFactory.DEFAULT_ZSTANDARD_LEVEL, false, false);
+    }
+
+    throw new IllegalArgumentException("Unsupported codec: " + codecName);
+  }
+
+  private static class NullCodec extends Codec {
+
+    @Override
+    public String getName() {
+      return DataFileConstants.NULL_CODEC;
+    }
+
+    @Override
+    public ByteBuffer compress(ByteBuffer buffer) {
+      return buffer;
+    }
+
+    @Override
+    public ByteBuffer decompress(ByteBuffer buffer) {
+      return buffer;
+    }
+
+    @Override
+    public boolean equals(Object other) {
+      if (this == other)
+        return true;
+      return (other != null && other.getClass() == getClass());
+    }
+
+    @Override
+    public int hashCode() {
+      return 2;
+    }
+  }
+
+}