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java.lang.Objectuk.ac.starlink.table.WrapperStarTable
uk.ac.starlink.table.ConcatStarTable
public class ConcatStarTable
StarTable implementation which concatenates several tables together top-to-bottom. A (possibly blank) metadata table is supplied to define the column and table metadata for the result, and other data tables are added on one way or another, depending which constructor is used. The columns of each data table must be compatible with the columns of the metadata table, or the the data will not be included.
Field Summary |
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Fields inherited from class uk.ac.starlink.table.WrapperStarTable |
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baseTable |
Constructor Summary | |
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ConcatStarTable(StarTable meta,
java.util.Iterator tableIt)
Constructs a concatenated table from a metadata table and an iterator over data-bearing tables. |
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ConcatStarTable(StarTable meta,
StarTable[] tables)
Constructs a concatenated table from a metadata table and an array of data-bearing tables. |
Method Summary | |
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static ColumnInfo[] |
extendColumnTypes(ColumnInfo[] colInfos,
StarTable[] tables)
Assembles column metadata objects which are compatible between multiple tables. |
java.lang.Object |
getCell(long irow,
int icol)
Returns the contents of a given table cell. |
java.lang.Object[] |
getRow(long irow)
Returns the contents of a given table row. |
long |
getRowCount()
Returns the number of rows in this table, if known. |
RowSequence |
getRowSequence()
Returns an object which can iterate over all the rows in the table sequentially. |
boolean |
isRandom()
Indicates whether random access is provided by this table. |
Methods inherited from class uk.ac.starlink.table.WrapperStarTable |
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checkedLongToInt, getBaseTable, getColumnAuxDataInfos, getColumnCount, getColumnInfo, getName, getParameterByName, getParameters, getURL, setName, setParameter, setURL, toString |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Constructor Detail |
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public ConcatStarTable(StarTable meta, java.util.Iterator tableIt)
meta
a warning message is
issued through the logging system and its rows are ignored.
meta
- table supplying column and table metadata for this one;
its row count is ignored and its data is never readtableIt
- iterator over constituent StarTable
s which
taken in sequence supply the row data for this onepublic ConcatStarTable(StarTable meta, StarTable[] tables) throws java.io.IOException
tables
are incompatible with the metadata
in meta
an IOException is thrown.
meta
- table supplying column and table metadata for this one;
its row count is ignored and its data is never readtables
- array of tables which taken in sequence supply the
row data for this one
java.io.IOException
- if any of tables
are not compatible
with meta
Method Detail |
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public long getRowCount()
StarTable
getRowCount
in interface StarTable
getRowCount
in class WrapperStarTable
public java.lang.Object getCell(long irow, int icol) throws java.io.IOException
StarTable
getCell
in interface StarTable
getCell
in class WrapperStarTable
irow
- the index of the cell's rowicol
- the index of the cell's column
java.io.IOException
- if there is an error reading the datapublic java.lang.Object[] getRow(long irow) throws java.io.IOException
StarTable
getRow
in interface StarTable
getRow
in class WrapperStarTable
irow
- the index of the row to retrieve
java.io.IOException
- if there is an error reading the datapublic boolean isRandom()
StarTable
StarTable.getRow(long)
and StarTable.getCell(long, int)
methods be used.
isRandom
in interface StarTable
isRandom
in class WrapperStarTable
public RowSequence getRowSequence() throws java.io.IOException
StarTable
getRowSequence
in interface StarTable
getRowSequence
in class WrapperStarTable
java.io.IOException
- if there is an error providing accesspublic static ColumnInfo[] extendColumnTypes(ColumnInfo[] colInfos, StarTable[] tables) throws java.io.IOException
This utility method is not used by ConcatStarTable instances, but it may be useful when preparing metadata tables for use with the constructor.
colInfos
- input column metadata objectstables
- list of tables with which columns must be compatible
java.io.IOException
- if compatibility cannot be achieved
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