ColumnFileReader (Apache Avro Java 1.7.5 API)

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

Methods
Modifier and Type	Method and 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.

getRowCount
```
public long getRowCount()
```
Return the number of rows in this file.

getColumnCount
```
public long getColumnCount()
```
Return the number of columns in this file.

public ColumnFileMetaData getMetaData()

Return this file's metadata.

public ColumnMetaData[] getColumnMetaData()

Return all columns' metadata.

getRoots
```
public List<ColumnMetaData> getRoots()
```
Return root columns' metadata. Roots are columns that have no parent.

public ColumnMetaData getColumnMetaData(int number)

Return a column's metadata.

public ColumnMetaData getColumnMetaData(String name)

Return a column's metadata.

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

Return an iterator over values in the named column.

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

Return an iterator over values in a column.

Class ColumnFileReader