ConversionProcessor
, Processor<T>
BatchedObjectColumnProcessor
public abstract class AbstractBatchedObjectColumnProcessor<T extends Context> extends AbstractObjectProcessor<T> implements Processor<T>
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.
AbstractParser
,
Processor
,
BatchedColumnReader
,
Conversion
,
AbstractObjectProcessor
Constructor | Description |
---|---|
AbstractBatchedObjectColumnProcessor(int rowsPerBatch) |
Constructs a abstract batched column processor configured to invoke the
batchesProcessed method after a given number of rows has been processed. |
Modifier and Type | Method | Description |
---|---|---|
abstract void |
batchProcessed(int rowsInThisBatch) |
|
int |
getBatchesProcessed() |
|
java.util.List<java.lang.Object> |
getColumn(int columnIndex) |
|
<V> java.util.List<V> |
getColumn(int columnIndex,
java.lang.Class<V> columnType) |
Returns the values of a given column.
|
java.util.List<java.lang.Object> |
getColumn(java.lang.String columnName) |
|
<V> java.util.List<V> |
getColumn(java.lang.String columnName,
java.lang.Class<V> columnType) |
Returns the values of a given column.
|
java.util.List<java.util.List<java.lang.Object>> |
getColumnValuesAsList() |
|
java.util.Map<java.lang.Integer,java.util.List<java.lang.Object>> |
getColumnValuesAsMapOfIndexes() |
|
java.util.Map<java.lang.String,java.util.List<java.lang.Object>> |
getColumnValuesAsMapOfNames() |
|
java.lang.String[] |
getHeaders() |
|
int |
getRowsPerBatch() |
|
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(java.util.Map<java.lang.Integer,java.util.List<java.lang.Object>> map) |
|
void |
putColumnValuesInMapOfNames(java.util.Map<java.lang.String,java.util.List<java.lang.Object>> map) |
|
void |
rowProcessed(java.lang.Object[] row,
T context) |
Invoked by the processor after all values of a valid record have been processed and converted into an Object array.
|
rowProcessed
applyConversions, convertAll, convertFields, convertIndexes, convertType, handleConversionError, initializeConversions, reverseConversions, toDataProcessingException
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
rowProcessed
public AbstractBatchedObjectColumnProcessor(int rowsPerBatch)
batchesProcessed
method after a given number of rows has been processed.rowsPerBatch
- the number of rows to process in each batch.public void processStarted(T context)
Processor
processStarted
in interface Processor<T extends Context>
processStarted
in class AbstractObjectProcessor<T extends Context>
context
- A contextual object with information and controls over the current state of the parsing processpublic void rowProcessed(java.lang.Object[] row, T context)
AbstractObjectProcessor
rowProcessed
in class AbstractObjectProcessor<T extends Context>
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 processpublic void processEnded(T context)
Processor
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()
.
processEnded
in interface Processor<T extends Context>
processEnded
in class AbstractObjectProcessor<T extends Context>
context
- A contextual object with information and controls over the state of the parsing processpublic final java.lang.String[] getHeaders()
public final java.util.List<java.util.List<java.lang.Object>> getColumnValuesAsList()
public final void putColumnValuesInMapOfNames(java.util.Map<java.lang.String,java.util.List<java.lang.Object>> map)
public final void putColumnValuesInMapOfIndexes(java.util.Map<java.lang.Integer,java.util.List<java.lang.Object>> map)
public final java.util.Map<java.lang.String,java.util.List<java.lang.Object>> getColumnValuesAsMapOfNames()
public final java.util.Map<java.lang.Integer,java.util.List<java.lang.Object>> getColumnValuesAsMapOfIndexes()
public java.util.List<java.lang.Object> getColumn(java.lang.String columnName)
public java.util.List<java.lang.Object> getColumn(int columnIndex)
public <V> java.util.List<V> getColumn(java.lang.String columnName, java.lang.Class<V> columnType)
V
- the type of data in that columncolumnName
- the name of the column in the input.columnType
- the type of data in that columnpublic <V> java.util.List<V> getColumn(int columnIndex, java.lang.Class<V> columnType)
V
- the type of data in that columncolumnIndex
- the position of the column in the input (0-based).columnType
- the type of data in that columnpublic int getRowsPerBatch()
public int getBatchesProcessed()
public abstract void batchProcessed(int rowsInThisBatch)