Record Class FileMetaData

java.lang.Object
java.lang.Record
dev.hardwood.metadata.FileMetaData
Record Components:
version - Parquet format version (currently 1 or 2)
schema - flattened schema elements as written in the file footer
numRows - total number of rows across all row groups
rowGroups - metadata for each row group in the file
keyValueMetadata - application-defined key-value metadata, or an empty map if absent
createdBy - identifier of the library that wrote the file, or null if absent
public record FileMetaData(int version, List<SchemaElement> schema, long numRows, List<RowGroup> rowGroups, Map<String,String> keyValueMetadata, String createdBy) extends Record
Top-level file metadata for a Parquet file.
See Also:

  • Constructor Details

    • FileMetaData

      public FileMetaData(int version, List<SchemaElement> schema, long numRows, List<RowGroup> rowGroups, Map<String,String> keyValueMetadata, String createdBy)
      Creates an instance of a FileMetaData record class.
      Parameters:
      version - the value for the version record component
      schema - the value for the schema record component
      numRows - the value for the numRows record component
      rowGroups - the value for the rowGroups record component
      keyValueMetadata - the value for the keyValueMetadata record component
      createdBy - the value for the createdBy record component

  • Method Details

    • toString

      public final String toString()
      Returns a string representation of this record class. The representation contains the name of the class, followed by the name and value of each of the record components.
      Specified by:
      toString in class Record
      Returns:
      a string representation of this object

    • hashCode

      public final int hashCode()
      Returns a hash code value for this object. The value is derived from the hash code of each of the record components.
      Specified by:
      hashCode in class Record
      Returns:
      a hash code value for this object

    • equals

      public final boolean equals(Object o)
      Indicates whether some other object is "equal to" this one. The objects are equal if the other object is of the same class and if all the record components are equal. Reference components are compared with Objects::equals(Object,Object); primitive components are compared with the compare method from their corresponding wrapper classes.
      Specified by:
      equals in class Record
      Parameters:
      o - the object with which to compare
      Returns:
      true if this object is the same as the o argument; false otherwise.

    • version

      public int version()
      Returns the value of the version record component.
      Returns:
      the value of the version record component

    • schema

      public List<SchemaElement> schema()
      Returns the value of the schema record component.
      Returns:
      the value of the schema record component

    • numRows

      public long numRows()
      Returns the value of the numRows record component.
      Returns:
      the value of the numRows record component

    • rowGroups

      public List<RowGroup> rowGroups()
      Returns the value of the rowGroups record component.
      Returns:
      the value of the rowGroups record component

    • keyValueMetadata

      public Map<String,String> keyValueMetadata()
      Returns the value of the keyValueMetadata record component.
      Returns:
      the value of the keyValueMetadata record component

    • createdBy

      public String createdBy()
      Returns the value of the createdBy record component.
      Returns:
      the value of the createdBy record component