Package org.apache.trevni

Class ColumnFileReader

java.lang.Object

org.apache.trevni.ColumnFileReader

All Implemented Interfaces:

Closeable, AutoCloseable

public class ColumnFileReader
extends Object
implements Closeable

Reads data from a column file.

Constructor Summary

Constructors

Constructor	Description
ColumnFileReader(File file)	Construct reading from the named file.
ColumnFileReader(Input file)	Construct reading from the provided input.

Method Summary

Modifier and Type	Method	Description
void	close()
long	getColumnCount()	Return the number of columns in this file.
ColumnMetaData[]	getColumnMetaData()	Return all columns' metadata.
ColumnMetaData	getColumnMetaData(int number)	Return a column's metadata.
ColumnMetaData	getColumnMetaData(String name)	Return a column's metadata.
ColumnFileMetaData	getMetaData()	Return this file's metadata.
List<ColumnMetaData>	getRoots()	Return root columns' metadata.
long	getRowCount()	Return the number of rows in this file.
<T extends Comparable> ColumnValues<T>	getValues(int column)	Return an iterator over values in a column.
<T extends Comparable> ColumnValues<T>	getValues(String columnName)	Return an iterator over values in the named column.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

ColumnFileReader

public ColumnFileReader(File file)
                 throws IOException

Construct reading from the named file.

Throws:

IOException

ColumnFileReader

public ColumnFileReader(Input file)
                 throws IOException

Construct reading from the provided input.

Throws:

IOException

Method Details

getRowCount

public long getRowCount()

Return the number of rows in this file.

getColumnCount

public long getColumnCount()

Return the number of columns in this file.

getMetaData

public ColumnFileMetaData getMetaData()

Return this file's metadata.

getColumnMetaData

public ColumnMetaData[] getColumnMetaData()

Return all columns' metadata.

getRoots

public List<ColumnMetaData> getRoots()

Return root columns' metadata. Roots are columns that have no parent.

getColumnMetaData

public ColumnMetaData getColumnMetaData(int number)

Return a column's metadata.

getColumnMetaData

public ColumnMetaData getColumnMetaData(String name)

Return a column's metadata.

getValues

public <T extends Comparable> ColumnValues<T> getValues(String columnName)
                                                 throws IOException

Return an iterator over values in the named column.

Throws:

IOException

getValues

public <T extends Comparable> ColumnValues<T> getValues(int column)
                                                 throws IOException

Return an iterator over values in a column.

Throws:

IOException

close

public void close()
           throws IOException

Specified by:

close in interface AutoCloseable

Specified by:

close in interface Closeable

Throws:

IOException