org.apache.metamodel.fixedwidth

Class FixedWidthDataContext

java.lang.Object

org.apache.metamodel.AbstractDataContext

org.apache.metamodel.QueryPostprocessDataContext

org.apache.metamodel.fixedwidth.FixedWidthDataContext

All Implemented Interfaces:

HasReadTypeConverters, DataContext

public class FixedWidthDataContext
extends QueryPostprocessDataContext

DataContext implementation for fixed width value files.

Field Summary

Fields inherited from class org.apache.metamodel.QueryPostprocessDataContext

INFORMATION_SCHEMA_NAME

Constructor Summary

Constructors

Constructor and Description
FixedWidthDataContext(File file, FixedWidthConfiguration configuration)
FixedWidthDataContext(Resource resource, FixedWidthConfiguration configuration)

Method Summary

Modifier and Type	Method and Description
FixedWidthConfiguration	getConfiguration() Gets the Fixed width value configuration used.
protected Schema	getMainSchema()
protected String	getMainSchemaName()
Resource	getResource() Gets the resource being read
DataSet	materializeMainSchemaTable(Table table, Column[] columns, int maxRows) Executes a simple one-table query against a table in the main schema of the subclasses of this class.

Methods inherited from class org.apache.metamodel.QueryPostprocessDataContext

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

Methods inherited from class org.apache.metamodel.AbstractDataContext

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

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

FixedWidthDataContext

public FixedWidthDataContext(File file,
                             FixedWidthConfiguration configuration)

FixedWidthDataContext

public FixedWidthDataContext(Resource resource,
                             FixedWidthConfiguration configuration)

Method Detail

getConfiguration

public FixedWidthConfiguration getConfiguration()

Gets the Fixed width value configuration used.

Returns:

a fixed width configuration

getResource

public Resource getResource()

Gets the resource being read

Returns:

a Resource object

getMainSchema

protected Schema getMainSchema()
                        throws MetaModelException

Specified by:

getMainSchema in class QueryPostprocessDataContext

Returns:

the main schema that subclasses of this class produce

Throws:

MetaModelException

getMainSchemaName

protected String getMainSchemaName()
                            throws MetaModelException

Specified by:

getMainSchemaName in class QueryPostprocessDataContext

Returns:

the name of the main schema that subclasses of this class produce

Throws:

MetaModelException

materializeMainSchemaTable

public DataSet materializeMainSchemaTable(Table table,
                                          Column[] columns,
                                          int maxRows)

Description copied from class: QueryPostprocessDataContext

Executes a simple one-table query against a table in the main schema of the subclasses of this class.

Specified by:

materializeMainSchemaTable in class QueryPostprocessDataContext

Parameters:

table - the table to query

columns - the columns of the table to query

maxRows - the maximum amount of rows needed or -1 if all rows are wanted.

Returns:

a dataset with the raw table/column content.