storj.io/minio@v0.0.0-20230509071714-0cbc90f649b1/pkg/s3select/parquet/args.go (about)

     1  /*
     2   * MinIO Cloud Storage, (C) 2019 MinIO, Inc.
     3   *
     4   * Licensed under the Apache License, Version 2.0 (the "License");
     5   * you may not use this file except in compliance with the License.
     6   * You may obtain a copy of the License at
     7   *
     8   *     http://www.apache.org/licenses/LICENSE-2.0
     9   *
    10   * Unless required by applicable law or agreed to in writing, software
    11   * distributed under the License is distributed on an "AS IS" BASIS,
    12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13   * See the License for the specific language governing permissions and
    14   * limitations under the License.
    15   */
    16  
    17  package parquet
    18  
    19  import "encoding/xml"
    20  
    21  // ReaderArgs - represents elements inside <InputSerialization><Parquet/> in request XML.
    22  type ReaderArgs struct {
    23  	unmarshaled bool
    24  }
    25  
    26  // IsEmpty - returns whether reader args is empty or not.
    27  func (args *ReaderArgs) IsEmpty() bool {
    28  	return !args.unmarshaled
    29  }
    30  
    31  // UnmarshalXML - decodes XML data.
    32  func (args *ReaderArgs) UnmarshalXML(d *xml.Decoder, start xml.StartElement) error {
    33  	// Make subtype to avoid recursive UnmarshalXML().
    34  	type subReaderArgs ReaderArgs
    35  	parsedArgs := subReaderArgs{}
    36  	if err := d.DecodeElement(&parsedArgs, &start); err != nil {
    37  		return err
    38  	}
    39  
    40  	args.unmarshaled = true
    41  	return nil
    42  }