org.apache.accumulo.core.data

Class Column

java.lang.Object

org.apache.accumulo.core.data.Column

All Implemented Interfaces:

Comparable<Column>, org.apache.hadoop.io.Writable, org.apache.hadoop.io.WritableComparable<Column>

public class Column
extends Object
implements org.apache.hadoop.io.WritableComparable<Column>

A column, specified by family, qualifier, and visibility.

Field Summary

Fields

Modifier and Type	Field and Description
byte[]	columnFamily
byte[]	columnQualifier
byte[]	columnVisibility

Constructor Summary

Constructors

Constructor and Description
Column() Creates a new blank column.
Column(byte[] columnFamily, byte[] columnQualifier, byte[] columnVisibility) Creates a new column.
Column(org.apache.accumulo.core.data.thrift.TColumn tcol) Creates a new column.

Method Summary

Modifier and Type	Method and Description
int	compareTo(Column that) Compares this column to another.
boolean	equals(Column that) Checks if this column equals another.
boolean	equals(Object that)
byte[]	getColumnFamily() Gets the column family.
byte[]	getColumnQualifier() Gets the column qualifier.
byte[]	getColumnVisibility() Gets the column visibility.
int	hashCode()
void	readFields(DataInput in)
String	toString() Gets a string representation of this column.
org.apache.accumulo.core.data.thrift.TColumn	toThrift() Converts this column to Thrift.
void	write(DataOutput out)

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

columnFamily

public byte[] columnFamily

columnQualifier

public byte[] columnQualifier

columnVisibility

public byte[] columnVisibility

Constructor Detail

Column

public Column()

Creates a new blank column.

Column

public Column(byte[] columnFamily,
              byte[] columnQualifier,
              byte[] columnVisibility)

Creates a new column.

Parameters:

columnFamily - family

columnQualifier - qualifier

columnVisibility - visibility

Column

public Column(org.apache.accumulo.core.data.thrift.TColumn tcol)

Creates a new column.

Parameters:

tcol - Thrift column

Method Detail

compareTo

public int compareTo(Column that)

Compares this column to another. Column families are compared first, then qualifiers, then visibilities.

Specified by:

compareTo in interface Comparable<Column>

Parameters:

that - column to compare

Returns:

comparison result

readFields

public void readFields(DataInput in)
                throws IOException

Specified by:

readFields in interface org.apache.hadoop.io.Writable

Throws:

IOException

write

public void write(DataOutput out)
           throws IOException

Specified by:

write in interface org.apache.hadoop.io.Writable

Throws:

IOException

equals

public boolean equals(Object that)

Overrides:

equals in class Object

equals

public boolean equals(Column that)

Checks if this column equals another.

Parameters:

that - column to compare

Returns:

true if this column equals that, false otherwise

hashCode

public int hashCode()

Overrides:

hashCode in class Object

getColumnFamily

public byte[] getColumnFamily()

Gets the column family. Not a defensive copy.

Returns:

family

getColumnQualifier

public byte[] getColumnQualifier()

Gets the column qualifier. Not a defensive copy.

Returns:

qualifier

getColumnVisibility

public byte[] getColumnVisibility()

Gets the column visibility. Not a defensive copy.

Returns:

visibility

toString

public String toString()

Gets a string representation of this column. The family, qualifier, and visibility are interpreted as strings using the UTF-8 encoding; nulls are interpreted as empty strings.

Overrides:

toString in class Object

Returns:

string form of column

toThrift

public org.apache.accumulo.core.data.thrift.TColumn toThrift()

Converts this column to Thrift.

Returns:

Thrift column