Package org.apache.metamodel.arff

Class ArffDataContext

  • All Implemented Interfaces:
    org.apache.metamodel.convert.HasReadTypeConverters, org.apache.metamodel.DataContext
    public class ArffDataContext
extends org.apache.metamodel.QueryPostprocessDataContext
    DataContext implementation for ARFF (.arff) files, which can be loosely described a specialized type of CSV files with schema information, comments and data types in the header section of the file.

    • Field Summary

      • Fields inherited from class org.apache.metamodel.QueryPostprocessDataContext

        INFORMATION_SCHEMA_NAME, SYSTEM_PROPERTY_CREATE_DEFAULT_TABLE_ALIAS

    • Constructor Summary

      Constructors 
      Constructor Description
      ArffDataContext​(org.apache.metamodel.util.Resource resource)  

    • Method Summary

      All Methods Static Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      protected org.apache.metamodel.schema.Schema getMainSchema()  
      protected String getMainSchemaName()  
      protected static boolean isIgnoreLine​(String line)  
      protected org.apache.metamodel.data.DataSet materializeMainSchemaTable​(org.apache.metamodel.schema.Table table, List<org.apache.metamodel.schema.Column> columns, int maxRows)  

      • Methods inherited from class org.apache.metamodel.QueryPostprocessDataContext

        addConverter, executeCountQuery, executePrimaryKeyLookupQuery, executeQuery, getDefaultSchemaName, getSchemaByNameInternal, getSchemaNamesInternal, isMainSchemaTable, isScalarFunctionMaterialized, materializeFromItem, materializeMainSchemaTable, materializeMainSchemaTable, materializeMainSchemaTableSelect, materializeTable

      • Methods inherited from class org.apache.metamodel.AbstractDataContext

        compileQuery, executeQuery, executeQuery, getColumnByQualifiedLabel, getDefaultSchema, getSchemaByName, getSchemaNames, getSchemas, getTableByQualifiedLabel, isQualifiedPathDelim, onSchemaCacheRefreshed, parseQuery, query, refreshSchemas

    • Constructor Detail

      • ArffDataContext

        public ArffDataContext​(org.apache.metamodel.util.Resource resource)

    • Method Detail

      • getMainSchema

        protected org.apache.metamodel.schema.Schema getMainSchema()
                                                    throws org.apache.metamodel.MetaModelException
        Specified by:
        getMainSchema in class org.apache.metamodel.QueryPostprocessDataContext
        Throws:
        org.apache.metamodel.MetaModelException

      • getMainSchemaName

        protected String getMainSchemaName()
                            throws org.apache.metamodel.MetaModelException
        Specified by:
        getMainSchemaName in class org.apache.metamodel.QueryPostprocessDataContext
        Throws:
        org.apache.metamodel.MetaModelException

      • materializeMainSchemaTable

        protected org.apache.metamodel.data.DataSet materializeMainSchemaTable​(org.apache.metamodel.schema.Table table,
                                                                       List<org.apache.metamodel.schema.Column> columns,
                                                                       int maxRows)
        Specified by:
        materializeMainSchemaTable in class org.apache.metamodel.QueryPostprocessDataContext

      • isIgnoreLine

        protected static boolean isIgnoreLine​(String line)