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java.lang.Object | +--uk.ac.starlink.table.ReaderRowSequence
Partial implementation of RowSequence suitable for subclassing
by classes which can read a row at a time and don't know when the
row stream will come to an end.
Concrete subclasses have to implement the readRow()
method.
Constructor Summary | |
ReaderRowSequence()
|
Method Summary | |
void |
advance(long nrows)
Moves the current row forward by offset rows. |
Object |
getCell(int icol)
Returns the contents of a cell in the current row. |
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. |
long |
getRowIndex()
Returns the index of the current row. |
boolean |
hasNext()
Indicates whether this table contains any more rows after the current one. |
void |
next()
Advances the current row by 1. |
protected abstract Object[] |
readRow()
Acquires the next row of objects from the input stream. |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
public ReaderRowSequence() throws IOException
Method Detail |
protected abstract Object[] readRow() throws IOException
IOException
- if there is trouble reading the datapublic void next() throws IOException
RowSequence
RowSequence.getCell(int)
or RowSequence.getRow()
methods are invoked.
next
in interface RowSequence
IOException
- if there is some error in the positioningpublic boolean hasNext()
RowSequence
hasNext
in interface RowSequence
public void advance(long nrows) throws IOException
RowSequence
advance
in interface RowSequence
nrows
- the number of rows to advance the current row by.
IOException
- if an attempt to advance beyond the end of the
table is made, or if there is some other read errorpublic Object getCell(int icol)
RowSequence
getCell
in interface RowSequence
public Object[] getRow()
RowSequence
getRow
in interface RowSequence
public long getRowIndex()
RowSequence
getRowIndex
in interface RowSequence
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Copyright © 2004 CLRC: Central Laboratory of the Research Councils. All rights reserved. | |||||||||
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