public class SequentialJELRowReader extends StarTableJELRowReader implements RowSequence
RowSequence,
and this object should be treated in the same way as a row sequence
taken out on its table, that is iteration should proceed using the
next and close methods.PARAM_PREFIX, UCD_PREFIX, UTYPE_PREFIXCOLUMN_ID_CHAR, NULL_QUERY_PREFIX, OBJECT_PREFIX| Constructor and Description |
|---|
SequentialJELRowReader(StarTable table)
Constructs a new row reader for sequential access.
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SequentialJELRowReader(StarTable table,
RowSplittable rsplit)
Constructs a new row reader for sequential access,
based on a supplied row splittable.
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| Modifier and Type | Method and Description |
|---|---|
void |
close()
Indicates that this sequence will not be required any more.
|
Object |
getCell(int icol)
Returns the value for a given column in this reader's table at
the current row.
|
long |
getCurrentRow()
If the current row is not known, an RuntimeException will be thrown.
|
Object[] |
getRow()
Returns the contents of the current table row, as an array
with the same number of elements as there are columns in this
table.
|
boolean |
next()
Attempts to advance the current row to the next one.
|
createDescribedValueConstant, getBooleanColumnValue, getByteColumnValue, getCharColumnValue, getColumnClass, getColumnIndexByName, getConstantByName, getDescribedValueByName, getDoubleColumnValue, getFloatColumnValue, getIntColumnValue, getLongColumnValue, getObjectColumnValue, getShortColumnValue, getSpecialByName, getTable, getUcdRegex, getUtypeRegex, isBlank, requiresRowIndex, valueDouble, valueInt, valueLong, valueObject, valueStringevaluate, evaluateBoolean, evaluateDouble, foundNull, getBooleanArrayProperty, getBooleanProperty, getBooleanProperty, getBooleanValue, getByteArrayProperty, getByteProperty, getByteValue, getCharArrayProperty, getCharProperty, getCharValue, getColumnIndex, getDateArrayProperty, getDoubleArrayProperty, getDoubleProperty, getDoubleValue, getFloatArrayProperty, getFloatProperty, getFloatValue, getIntArrayProperty, getIntProperty, getIntValue, getLongArrayProperty, getLongProperty, getLongValue, getNumberProperty, getObjectArrayProperty, getObjectProperty, getShortArrayProperty, getShortProperty, getShortValue, getStringArrayProperty, getStringProperty, getTranslatedColumns, getTranslatedConstants, getTypeName, setFailOnNull, stripPrefix, translatepublic SequentialJELRowReader(StarTable table) throws IOException
table.table - table to readIOExceptionpublic SequentialJELRowReader(StarTable table, RowSplittable rsplit)
Note if the RowSplittable.rowIndex() method
of the supplied RowSplittable returns null,
the getCurrentRow() method of the object constructed
here will throw an exception.
Before using this reader to evaluate an expression,
the StarTableJELRowReader.requiresRowIndex() method should be called to determine
if trouble lies ahead.
table - table to readrsplit - row splittable, must apply to the supplied tablepublic Object getCell(int icol) throws IOException
StarTableJELRowReadergetCell in interface RowDatagetCell in interface RowSequencegetCell in class StarTableJELRowReadericol - column indexicol at the current rowIOException - if there is an error reading the datapublic Object[] getRow() throws IOException
RowSequencenext has not yet been called).getRow in interface RowDatagetRow in interface RowSequenceirowIOException - if there is an error reading the datapublic boolean next()
throws IOException
RowSequencetrue is returned the attempt has been successful,
and if false is returned there are no more rows in this
sequence.
Since the initial position of a RowSequence is before the first row,
this method must be called before current row data
can be accessed using the
RowSequence.getCell(int) or RowSequence.getRow() methods.next in interface RowSequencenext in interface Sequencetrue iff this sequence has been advanced to the
next rowIOException - if there is some errorpublic long getCurrentRow()
getCurrentRow in class StarTableJELRowReaderpublic void close()
throws IOException
RowSequenceclose is undefined.close in interface Closeableclose in interface AutoCloseableclose in interface RowSequenceIOExceptionCopyright © 2024 Central Laboratory of the Research Councils. All Rights Reserved.