Package org.openrefine.operations.cell

Class KeyValueColumnizeOperation

  • All Implemented Interfaces:
    Operation
    public class KeyValueColumnizeOperation
extends Object
implements Operation
    Reshapes a table which contains key and value columns, such that the repeating contents in the key column become new column names, and the contents of the value column are spread in the new columns.

    • Field Detail

      • _keyColumnName

        protected final String _keyColumnName

      • _valueColumnName

        protected final String _valueColumnName

      • _noteColumnName

        protected final String _noteColumnName

    • Constructor Detail

      • KeyValueColumnizeOperation

        public KeyValueColumnizeOperation​(String keyColumnName,
                                  String valueColumnName,
                                  String noteColumnName)

    • Method Detail

      • apply

        public ChangeResult apply​(Grid projectState,
                          ChangeContext context)
                   throws OperationException
        Description copied from interface: Operation
        Derives the new grid state from the current grid state. Executing this method should be quick (even on large datasets) since it is expected to just derive the new grid from the existing one without actually executing any expensive computation. Long-running computations should rather go in the derivation of a ChangeData which will be fetched asynchronously.
        Specified by:
        apply in interface Operation
        Parameters:
        projectState - the state of the grid before the change
        Returns:
        an object which bundles up various pieces of information produced by the operation: primarily, the new grid after applying the operation. This object can be subclassed to expose more information, which should be serializable with Jackson so that it reaches the frontend.
        Throws:
        OperationException - when the change cannot be applied to the given grid

      • getKeyColumnName

        public String getKeyColumnName()

      • getValueColumnName

        public String getValueColumnName()

      • getNoteColumnName

        public String getNoteColumnName()

      • getDescription

        public String getDescription()
        Description copied from interface: Operation
        A short human-readable description of what this operation does.
        Specified by:
        getDescription in interface Operation