Package uk.ac.starlink.table
Class ExplodedStarTable
- java.lang.Object
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- uk.ac.starlink.table.WrapperStarTable
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- uk.ac.starlink.table.ExplodedStarTable
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- All Implemented Interfaces:
java.io.Closeable
,java.lang.AutoCloseable
,StarTable
public class ExplodedStarTable extends WrapperStarTable
Wrapper table which takes any column whose value is N-element arrays and turns it into N scalar-valued columns.- Since:
- 2 Mar 2005
- Author:
- Mark Taylor (Starlink)
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Field Summary
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Fields inherited from class uk.ac.starlink.table.WrapperStarTable
baseTable
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Constructor Summary
Constructors Constructor Description ExplodedStarTable(StarTable baseTable)
Constructs a table in which all fixed-length array-valued columns are exploded.ExplodedStarTable(StarTable baseTable, boolean[] colFlags)
Constructs a table in which specified columns are exploded.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description java.lang.Object
getCell(long irow, int icol)
Returns the contents of a given table cell.int
getColumnCount()
Returns the number of columns in this table.ColumnInfo
getColumnInfo(int icol)
Returns the object describing the data in a given column.java.lang.Object[]
getRow(long irow)
Returns the contents of a given table row.RowAccess
getRowAccess()
Returns an object which can provide random access to this table's data, if random access is implemented.RowSequence
getRowSequence()
Returns an object which can iterate over all the rows in the table sequentially.RowSplittable
getRowSplittable()
Returns an object which can iterate over all the rows in the table, but which may also be requested to split recursively for potentially parallel processing.-
Methods inherited from class uk.ac.starlink.table.WrapperStarTable
checkedLongToInt, close, getBaseTable, getColumnAuxDataInfos, getName, getParameterByName, getParameters, getRowCount, getURL, isRandom, setName, setParameter, setURL, toString
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Constructor Detail
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ExplodedStarTable
public ExplodedStarTable(StarTable baseTable, boolean[] colFlags)
Constructs a table in which specified columns are exploded. All of the specified columns must have values which are fixed-length arrays.- Parameters:
baseTable
- base tablecolFlags
- array of flags the same length as the number of columns inbaseTable
; true elements indicate columns in the base table which should be exploded- Throws:
java.lang.IllegalArgumentException
- if any column specified bycolFlags
has a type which is not a fixed-length array
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ExplodedStarTable
public ExplodedStarTable(StarTable baseTable)
Constructs a table in which all fixed-length array-valued columns are exploded.- Parameters:
baseTable
- base table
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Method Detail
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getColumnCount
public int getColumnCount()
Description copied from interface:StarTable
Returns the number of columns in this table.- Specified by:
getColumnCount
in interfaceStarTable
- Overrides:
getColumnCount
in classWrapperStarTable
- Returns:
- the number of columns
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getColumnInfo
public ColumnInfo getColumnInfo(int icol)
Description copied from interface:StarTable
Returns the object describing the data in a given column.- Specified by:
getColumnInfo
in interfaceStarTable
- Overrides:
getColumnInfo
in classWrapperStarTable
- Parameters:
icol
- the column for which header information is required- Returns:
- a ValueInfo object for column icol
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getCell
public java.lang.Object getCell(long irow, int icol) throws java.io.IOException
Description copied from interface:StarTable
Returns the contents of a given table cell. The class of the returned object should be the same as, or a subclass of, the class returned by getColumnInfo(icol).getContentClass().This method is safe for concurrent use from multiple threads, but in general it is recommended to use a
RowAccess
instead.- Specified by:
getCell
in interfaceStarTable
- Overrides:
getCell
in classWrapperStarTable
- Parameters:
irow
- the index of the cell's rowicol
- the index of the cell's column- Returns:
- the contents of this cell
- Throws:
java.io.IOException
- if there is an error reading the data
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getRow
public java.lang.Object[] getRow(long irow) throws java.io.IOException
Description copied from interface:StarTable
Returns the contents of a given table row. The returned value is equivalent to an array formed of all the objects returned by getCell(irow,icol) for all the columns icol in sequence.This method is safe for concurrent use from multiple threads, but in general it is recommended to use a
RowAccess
instead.- Specified by:
getRow
in interfaceStarTable
- Overrides:
getRow
in classWrapperStarTable
- Parameters:
irow
- the index of the row to retrieve- Returns:
- an array of the objects in each cell in row irow
- Throws:
java.io.IOException
- if there is an error reading the data
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getRowSequence
public RowSequence getRowSequence() throws java.io.IOException
Description copied from interface:StarTable
Returns an object which can iterate over all the rows in the table sequentially. Each such returned object is safe for use within a single thread, but not in general from multiple threads concurrently.- Specified by:
getRowSequence
in interfaceStarTable
- Overrides:
getRowSequence
in classWrapperStarTable
- Returns:
- new RowSequence
- Throws:
java.io.IOException
- if there is an error providing access
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getRowAccess
public RowAccess getRowAccess() throws java.io.IOException
Description copied from interface:StarTable
Returns an object which can provide random access to this table's data, if random access is implemented. Each such returned object is safe for use within a single thread, but not in general from multiple threads concurrently.- Specified by:
getRowAccess
in interfaceStarTable
- Overrides:
getRowAccess
in classWrapperStarTable
- Returns:
- new RowAccess
- Throws:
java.io.IOException
- if there is an error setting up access
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getRowSplittable
public RowSplittable getRowSplittable() throws java.io.IOException
Description copied from interface:StarTable
Returns an object which can iterate over all the rows in the table, but which may also be requested to split recursively for potentially parallel processing.The return value must be non-null, and may provide splitting arrangements specially appropriate for the implementation. If this table 'wraps' an upstream table, it is usually best to base the implementation on calls to the the upstream
getRowSplittable
method, so that upstream policy about how to divide up the table is respected. However, implementations without special requirements may returnTables.getDefaultRowSplittable
(this)
.- Specified by:
getRowSplittable
in interfaceStarTable
- Overrides:
getRowSplittable
in classWrapperStarTable
- Returns:
- new RowSplittable
- Throws:
java.io.IOException
- See Also:
RowRunner
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