com.univocity.parsers.common.processor.core
Class AbstractBatchedObjectColumnProcessor<T extends Context>

java.lang.Object
  com.univocity.parsers.common.DefaultConversionProcessor
      com.univocity.parsers.common.processor.core.AbstractObjectProcessor<T>
          com.univocity.parsers.common.processor.core.AbstractBatchedObjectColumnProcessor<T>

All Implemented Interfaces:

ConversionProcessor, Processor<T>

Direct Known Subclasses:

BatchedObjectColumnProcessor

public abstract class AbstractBatchedObjectColumnProcessor<T extends Context>
extends AbstractObjectProcessor<T>
implements Processor<T>

A Processor implementation for converting batches of rows extracted from any implementation of AbstractParser into columns of objects.

This uses the value conversions provided by Conversion instances.

For each row processed, a sequence of conversions will be executed to generate the appropriate object. Each resulting object will then be stored in a list that contains the values of the corresponding column.

During the execution of the process, the batchProcessed(int) method will be invoked after a given number of rows has been processed.

The user can access the lists with values parsed for all columns using the methods getColumnValuesAsList(), getColumnValuesAsMapOfIndexes() and getColumnValuesAsMapOfNames().

After batchProcessed(int) is invoked, all values will be discarded and the next batch of column values will be accumulated. This process will repeat until there's no more rows in the input.

Author:

uniVocity Software Pty Ltd - parsers@univocity.com

See Also:

AbstractParser, Processor, BatchedColumnReader, Conversion, AbstractObjectProcessor

Constructor Summary

AbstractBatchedObjectColumnProcessor(int rowsPerBatch)
Constructs a abstract batched column processor configured to invoke the batchesProcessed method after a given number of rows has been processed.

Method Summary

abstract void	batchProcessed(int rowsInThisBatch) Callback to the user, where the lists with values parsed for all columns can be accessed using the methods getColumnValuesAsList(), getColumnValuesAsMapOfIndexes() and getColumnValuesAsMapOfNames().
int	getBatchesProcessed() Returns the number of batches already processed
List<Object>	getColumn(int columnIndex) Returns the values of a given column.
<V> List<V>	getColumn(int columnIndex, Class<V> columnType) Returns the values of a given column.
List<Object>	getColumn(String columnName) Returns the values of a given column.
<V> List<V>	getColumn(String columnName, Class<V> columnType) Returns the values of a given column.
List<List<Object>>	getColumnValuesAsList() Returns the values processed for each column
Map<Integer,List<Object>>	getColumnValuesAsMapOfIndexes() Returns a map of column indexes and their respective list of values parsed from the input.
Map<String,List<Object>>	getColumnValuesAsMapOfNames() Returns a map of column names and their respective list of values parsed from the input.
String[]	getHeaders() Returns the column headers.
int	getRowsPerBatch() Returns the number of rows processed in each batch
void	processEnded(T context) This method will by invoked by the parser once, after the parsing process stopped and all resources were closed.
void	processStarted(T context) This method will by invoked by the parser once, when it is ready to start processing the input.
void	putColumnValuesInMapOfIndexes(Map<Integer,List<Object>> map) Fills a given map associating each column index to its list of values
void	putColumnValuesInMapOfNames(Map<String,List<Object>> map) Fills a given map associating each column name to its list o values
void	rowProcessed(Object[] row, T context) Invoked by the processor after all values of a valid record have been processed and converted into an Object array.

Methods inherited from class com.univocity.parsers.common.processor.core.AbstractObjectProcessor

rowProcessed

Methods inherited from class com.univocity.parsers.common.DefaultConversionProcessor

applyConversions, convertAll, convertFields, convertIndexes, convertType, handleConversionError, reverseConversions

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.univocity.parsers.common.processor.core.Processor

rowProcessed

Constructor Detail

AbstractBatchedObjectColumnProcessor

public AbstractBatchedObjectColumnProcessor(int rowsPerBatch)

Constructs a abstract batched column processor configured to invoke the batchesProcessed method after a given number of rows has been processed.

Parameters:

rowsPerBatch - the number of rows to process in each batch.

Method Detail

processStarted

public void processStarted(T context)

Description copied from interface: Processor

This method will by invoked by the parser once, when it is ready to start processing the input.

Specified by:

processStarted in interface Processor<T extends Context>

Overrides:

processStarted in class AbstractObjectProcessor<T extends Context>

Parameters:

context - A contextual object with information and controls over the current state of the parsing process

rowProcessed

public void rowProcessed(Object[] row,
                         T context)

Description copied from class: AbstractObjectProcessor

Invoked by the processor after all values of a valid record have been processed and converted into an Object array.

Specified by:

rowProcessed in class AbstractObjectProcessor<T extends Context>

Parameters:

row - object array created with the information extracted by the parser and then converted.

context - A contextual object with information and controls over the current state of the parsing process

processEnded

public void processEnded(T context)

Description copied from interface: Processor

This method will by invoked by the parser once, after the parsing process stopped and all resources were closed.

It will always be called by the parser: in case of errors, if the end of the input us reached, or if the user stopped the process manually using Context.stop().

Specified by:

processEnded in interface Processor<T extends Context>

Overrides:

processEnded in class AbstractObjectProcessor<T extends Context>

Parameters:

context - A contextual object with information and controls over the state of the parsing process

getHeaders

public final String[] getHeaders()

Returns the column headers. This can be either the headers defined in CommonSettings.getHeaders() or the headers parsed in the input when CommonSettings.getHeaders() equals to true

Returns:

the headers of all column parsed.

getColumnValuesAsList

public final List<List<Object>> getColumnValuesAsList()

Returns the values processed for each column

Returns:

a list of lists. The stored lists correspond to the position of the column processed from the input; Each list contains the corresponding values parsed for a column, across multiple rows.

putColumnValuesInMapOfNames

public final void putColumnValuesInMapOfNames(Map<String,List<Object>> map)

Fills a given map associating each column name to its list o values

Parameters:

map - the map to hold the values of each column

putColumnValuesInMapOfIndexes

public final void putColumnValuesInMapOfIndexes(Map<Integer,List<Object>> map)

Fills a given map associating each column index to its list of values

Parameters:

map - the map to hold the values of each column

getColumnValuesAsMapOfNames

public final Map<String,List<Object>> getColumnValuesAsMapOfNames()

Returns a map of column names and their respective list of values parsed from the input.

Returns:

a map of column names and their respective list of values.

getColumnValuesAsMapOfIndexes

public final Map<Integer,List<Object>> getColumnValuesAsMapOfIndexes()

Returns a map of column indexes and their respective list of values parsed from the input.

Returns:

a map of column indexes and their respective list of values.

getColumn

public List<Object> getColumn(String columnName)

Returns the values of a given column.

Parameters:

columnName - the name of the column in the input.

Returns:

a list with all data stored in the given column

getColumn

public List<Object> getColumn(int columnIndex)

Returns the values of a given column.

Parameters:

columnIndex - the position of the column in the input (0-based).

Returns:

a list with all data stored in the given column

getColumn

public <V> List<V> getColumn(String columnName,
                             Class<V> columnType)

Returns the values of a given column.

Type Parameters:

V - the type of data in that column

Parameters:

columnName - the name of the column in the input.

columnType - the type of data in that column

Returns:

a list with all data stored in the given column

getColumn

public <V> List<V> getColumn(int columnIndex,
                             Class<V> columnType)

Returns the values of a given column.

Type Parameters:

V - the type of data in that column

Parameters:

columnIndex - the position of the column in the input (0-based).

columnType - the type of data in that column

Returns:

a list with all data stored in the given column

getRowsPerBatch

public int getRowsPerBatch()

Returns the number of rows processed in each batch

Returns:

the number of rows per batch

getBatchesProcessed

public int getBatchesProcessed()

Returns the number of batches already processed

Returns:

the number of batches already processed

batchProcessed

public abstract void batchProcessed(int rowsInThisBatch)

Callback to the user, where the lists with values parsed for all columns can be accessed using the methods getColumnValuesAsList(), getColumnValuesAsMapOfIndexes() and getColumnValuesAsMapOfNames().

Parameters:

rowsInThisBatch - the number of rows processed in the current batch. This corresponds to the number of elements of each list of each column.