org.apache.accumulo.core.data

Class Range

java.lang.Object

org.apache.accumulo.core.data.Range

All Implemented Interfaces:

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

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

This class is used to specify a range of Accumulo Keys.

Constructor Summary

Constructors

Constructor and Description
Range() Creates a range that goes from negative to positive infinity
Range(CharSequence row) Creates a range that covers an entire row
Range(CharSequence startRow, boolean startRowInclusive, CharSequence endRow, boolean endRowInclusive) Creates a range from startRow to endRow
Range(CharSequence startRow, CharSequence endRow) Creates a range from startRow inclusive to endRow inclusive
Range(Key startKey, boolean startKeyInclusive, Key endKey, boolean endKeyInclusive) Creates a range from startKey to endKey
Range(Key startKey, Key endKey) Creates a range from startKey inclusive to endKey inclusive
Range(Key start, Key stop, boolean startKeyInclusive, boolean stopKeyInclusive, boolean infiniteStartKey, boolean infiniteStopKey)
Range(Range range) Copies a range
Range(org.apache.hadoop.io.Text row) Creates a range that covers an entire row
Range(org.apache.hadoop.io.Text startRow, boolean startRowInclusive, org.apache.hadoop.io.Text endRow, boolean endRowInclusive) Creates a range from startRow to endRow
Range(org.apache.hadoop.io.Text startRow, org.apache.hadoop.io.Text endRow) Creates a range from startRow inclusive to endRow inclusive
Range(TRange trange)

Method Summary

Methods

Modifier and Type	Method and Description
boolean	afterEndKey(Key key)
boolean	beforeStartKey(Key key)
Range	bound(Column min, Column max) Creates a new range that is bounded by the columns passed in.
Range	clip(Range range) Creates a range which represents the intersection of this range and the passed in range.
Range	clip(Range range, boolean returnNullIfDisjoint) Same as other clip function except if gives the option to return null of the ranges do not overlap instead of throwing an exception.
int	compareTo(Range o) Compares this range to another range.
boolean	contains(Key key)
boolean	equals(Object o)
boolean	equals(Range otherRange)
static Range	exact(CharSequence row) Creates a range that covers an exact row
static Range	exact(CharSequence row, CharSequence cf) Creates a range that covers an exact row and column family
static Range	exact(CharSequence row, CharSequence cf, CharSequence cq) Creates a range that covers an exact row, column family, and column qualifier
static Range	exact(CharSequence row, CharSequence cf, CharSequence cq, CharSequence cv) Creates a range that covers an exact row, column family, column qualifier, and visibility
static Range	exact(CharSequence row, CharSequence cf, CharSequence cq, CharSequence cv, long ts) Creates a range that covers an exact row, column family, column qualifier, visibility, and timestamp
static Range	exact(org.apache.hadoop.io.Text row) Creates a range that covers an exact row Returns the same Range as new Range(row)
static Range	exact(org.apache.hadoop.io.Text row, org.apache.hadoop.io.Text cf) Creates a range that covers an exact row and column family
static Range	exact(org.apache.hadoop.io.Text row, org.apache.hadoop.io.Text cf, org.apache.hadoop.io.Text cq) Creates a range that covers an exact row, column family, and column qualifier
static Range	exact(org.apache.hadoop.io.Text row, org.apache.hadoop.io.Text cf, org.apache.hadoop.io.Text cq, org.apache.hadoop.io.Text cv) Creates a range that covers an exact row, column family, column qualifier, and visibility
static Range	exact(org.apache.hadoop.io.Text row, org.apache.hadoop.io.Text cf, org.apache.hadoop.io.Text cq, org.apache.hadoop.io.Text cv, long ts) Creates a range that covers an exact row, column family, column qualifier, visibility, and timestamp
static org.apache.hadoop.io.Text	followingPrefix(org.apache.hadoop.io.Text prefix) Returns a Text that sorts just after all Texts beginning with a prefix
Key	getEndKey()
Key	getStartKey()
int	hashCode()
boolean	isEndKeyInclusive()
boolean	isInfiniteStartKey()
boolean	isInfiniteStopKey()
boolean	isStartKeyInclusive()
static List<Range>	mergeOverlapping(Collection<Range> ranges) Takes a collection on range and merges overlapping and adjacent ranges.
static Range	prefix(CharSequence rowPrefix) Returns a Range that covers all rows beginning with a prefix
static Range	prefix(CharSequence row, CharSequence cfPrefix) Returns a Range that covers all column families beginning with a prefix within a given row
static Range	prefix(CharSequence row, CharSequence cf, CharSequence cqPrefix) Returns a Range that covers all column qualifiers beginning with a prefix within a given row and column family
static Range	prefix(CharSequence row, CharSequence cf, CharSequence cq, CharSequence cvPrefix) Returns a Range that covers all column visibilities beginning with a prefix within a given row, column family, and column qualifier
static Range	prefix(org.apache.hadoop.io.Text rowPrefix) Returns a Range that covers all rows beginning with a prefix
static Range	prefix(org.apache.hadoop.io.Text row, org.apache.hadoop.io.Text cfPrefix) Returns a Range that covers all column families beginning with a prefix within a given row
static Range	prefix(org.apache.hadoop.io.Text row, org.apache.hadoop.io.Text cf, org.apache.hadoop.io.Text cqPrefix) Returns a Range that covers all column qualifiers beginning with a prefix within a given row and column family
static Range	prefix(org.apache.hadoop.io.Text row, org.apache.hadoop.io.Text cf, org.apache.hadoop.io.Text cq, org.apache.hadoop.io.Text cvPrefix) Returns a Range that covers all column visibilities beginning with a prefix within a given row, column family, and column qualifier
void	readFields(DataInput in)
String	toString()
TRange	toThrift()
void	write(DataOutput out)

Methods inherited from class java.lang.Object

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

Constructor Detail

Range

public Range()

Creates a range that goes from negative to positive infinity

Range

public Range(Key startKey,
     Key endKey)

Creates a range from startKey inclusive to endKey inclusive

Parameters:

startKey - set this to null when negative infinity is needed

endKey - set this to null when positive infinity is needed

Range

public Range(CharSequence row)

Creates a range that covers an entire row

Parameters:

row - set this to null to cover all rows

Range

public Range(org.apache.hadoop.io.Text row)

Creates a range that covers an entire row

Parameters:

row - set this to null to cover all rows

Range

public Range(org.apache.hadoop.io.Text startRow,
     org.apache.hadoop.io.Text endRow)

Creates a range from startRow inclusive to endRow inclusive

Parameters:

startRow - set this to null when negative infinity is needed

endRow - set this to null when positive infinity is needed

Range

public Range(CharSequence startRow,
     CharSequence endRow)

Creates a range from startRow inclusive to endRow inclusive

Parameters:

startRow - set this to null when negative infinity is needed

endRow - set this to null when positive infinity is needed

Range

public Range(org.apache.hadoop.io.Text startRow,
     boolean startRowInclusive,
     org.apache.hadoop.io.Text endRow,
     boolean endRowInclusive)

Creates a range from startRow to endRow

Parameters:

startRow - set this to null when negative infinity is needed

startRowInclusive - determines if the start row is skipped

endRow - set this to null when positive infinity is needed

endRowInclusive - determines if the endRow is included

Range

public Range(CharSequence startRow,
     boolean startRowInclusive,
     CharSequence endRow,
     boolean endRowInclusive)

Creates a range from startRow to endRow

Parameters:

startRow - set this to null when negative infinity is needed

startRowInclusive - determines if the start row is skipped

endRow - set this to null when positive infinity is needed

endRowInclusive - determines if the endRow is included

Range

public Range(Key startKey,
     boolean startKeyInclusive,
     Key endKey,
     boolean endKeyInclusive)

Creates a range from startKey to endKey

Parameters:

startKey - set this to null when negative infinity is needed

startKeyInclusive - determines if the ranges includes the start key

endKey - set this to null when infinity is needed

endKeyInclusive - determines if the range includes the end key

Range

public Range(Range range)

Copies a range

Range

public Range(Key start,
     Key stop,
     boolean startKeyInclusive,
     boolean stopKeyInclusive,
     boolean infiniteStartKey,
     boolean infiniteStopKey)

Range

public Range(TRange trange)

Method Detail

getStartKey

public Key getStartKey()

Returns:

the first key in the range, null if the key is infinite

beforeStartKey

public boolean beforeStartKey(Key key)

Parameters:

key -

Returns:

true if the given key is before the range, otherwise false

getEndKey

public Key getEndKey()

Returns:

the last key in the range, null if the end key is infinite

afterEndKey

public boolean afterEndKey(Key key)

Parameters:

key -

Returns:

true if the given key is after the range, otherwise false

hashCode

public int hashCode()

Overrides:

hashCode in class Object

equals

public boolean equals(Object o)

Overrides:

equals in class Object

equals

public boolean equals(Range otherRange)

compareTo

public int compareTo(Range o)

Compares this range to another range. Compares in the order start key, inclusiveness of start key, end key, inclusiveness of end key. Infinite keys sort first, and non-infinite keys are compared with Key.compareTo(Key). Inclusive sorts before non-inclusive.

Specified by:

compareTo in interface Comparable<Range>

contains

public boolean contains(Key key)

Parameters:

key -

Returns:

true if the given key falls within the range

mergeOverlapping

public static List<Range> mergeOverlapping(Collection<Range> ranges)

Takes a collection on range and merges overlapping and adjacent ranges. For example given the following input

 [a,c], (c, d], (g,m), (j,t]
 

the following ranges would be returned

 [a,d], (g,t]
 

Parameters:

ranges -

Returns:

list of merged ranges

clip

public Range clip(Range range)

Creates a range which represents the intersection of this range and the passed in range. The following example will print true.

 Range range1 = new Range("a", "f");
 Range range2 = new Range("c", "n");
 Range range3 = range1.clip(range2);
 System.out.println(range3.equals(new Range("c", "f")));
 

Parameters:

range -

Returns:

the intersection

Throws:

IllegalArgumentException - if ranges does not overlap

clip

public Range clip(Range range,
         boolean returnNullIfDisjoint)

Same as other clip function except if gives the option to return null of the ranges do not overlap instead of throwing an exception.

Parameters:

range -

returnNullIfDisjoint - If the ranges do not overlap and true is passed, then null is returned otherwise an exception is thrown.

Returns:

the intersection

See Also:

clip(Range)

bound

public Range bound(Column min,
          Column max)

Creates a new range that is bounded by the columns passed in. The stary key in the returned range will have a column >= to the minimum column. The end key in the returned range will have a column <= the max column.

Parameters:

min -

max -

Returns:

a column bounded range

Throws:

IllegalArgumentException - if min > max

toString

public String toString()

Overrides:

toString in class Object

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

isStartKeyInclusive

public boolean isStartKeyInclusive()

isEndKeyInclusive

public boolean isEndKeyInclusive()

toThrift

public TRange toThrift()

isInfiniteStartKey

public boolean isInfiniteStartKey()

isInfiniteStopKey

public boolean isInfiniteStopKey()

exact

public static Range exact(org.apache.hadoop.io.Text row)

Creates a range that covers an exact row Returns the same Range as new Range(row)

Parameters:

row - all keys in the range will have this row

exact

public static Range exact(org.apache.hadoop.io.Text row,
          org.apache.hadoop.io.Text cf)

Creates a range that covers an exact row and column family

Parameters:

row - all keys in the range will have this row

cf - all keys in the range will have this column family

exact

public static Range exact(org.apache.hadoop.io.Text row,
          org.apache.hadoop.io.Text cf,
          org.apache.hadoop.io.Text cq)

Creates a range that covers an exact row, column family, and column qualifier

Parameters:

row - all keys in the range will have this row

cf - all keys in the range will have this column family

cq - all keys in the range will have this column qualifier

exact

public static Range exact(org.apache.hadoop.io.Text row,
          org.apache.hadoop.io.Text cf,
          org.apache.hadoop.io.Text cq,
          org.apache.hadoop.io.Text cv)

Creates a range that covers an exact row, column family, column qualifier, and visibility

Parameters:

row - all keys in the range will have this row

cf - all keys in the range will have this column family

cq - all keys in the range will have this column qualifier

cv - all keys in the range will have this column visibility

exact

public static Range exact(org.apache.hadoop.io.Text row,
          org.apache.hadoop.io.Text cf,
          org.apache.hadoop.io.Text cq,
          org.apache.hadoop.io.Text cv,
          long ts)

Creates a range that covers an exact row, column family, column qualifier, visibility, and timestamp

Parameters:

row - all keys in the range will have this row

cf - all keys in the range will have this column family

cq - all keys in the range will have this column qualifier

cv - all keys in the range will have this column visibility

ts - all keys in the range will have this timestamp

followingPrefix

public static org.apache.hadoop.io.Text followingPrefix(org.apache.hadoop.io.Text prefix)

Returns a Text that sorts just after all Texts beginning with a prefix

Parameters:

prefix -

prefix

public static Range prefix(org.apache.hadoop.io.Text rowPrefix)

Returns a Range that covers all rows beginning with a prefix

Parameters:

rowPrefix - all keys in the range will have rows that begin with this prefix

prefix

public static Range prefix(org.apache.hadoop.io.Text row,
           org.apache.hadoop.io.Text cfPrefix)

Returns a Range that covers all column families beginning with a prefix within a given row

Parameters:

row - all keys in the range will have this row

cfPrefix - all keys in the range will have column families that begin with this prefix

prefix

public static Range prefix(org.apache.hadoop.io.Text row,
           org.apache.hadoop.io.Text cf,
           org.apache.hadoop.io.Text cqPrefix)

Returns a Range that covers all column qualifiers beginning with a prefix within a given row and column family

Parameters:

row - all keys in the range will have this row

cf - all keys in the range will have this column family

cqPrefix - all keys in the range will have column qualifiers that begin with this prefix

prefix

public static Range prefix(org.apache.hadoop.io.Text row,
           org.apache.hadoop.io.Text cf,
           org.apache.hadoop.io.Text cq,
           org.apache.hadoop.io.Text cvPrefix)

Returns a Range that covers all column visibilities beginning with a prefix within a given row, column family, and column qualifier

Parameters:

row - all keys in the range will have this row

cf - all keys in the range will have this column family

cq - all keys in the range will have this column qualifier

cvPrefix - all keys in the range will have column visibilities that begin with this prefix

exact

public static Range exact(CharSequence row)

Creates a range that covers an exact row

See Also:

exact(Text)

exact

public static Range exact(CharSequence row,
          CharSequence cf)

Creates a range that covers an exact row and column family

See Also:

exact(Text, Text)

exact

public static Range exact(CharSequence row,
          CharSequence cf,
          CharSequence cq)

Creates a range that covers an exact row, column family, and column qualifier

See Also:

exact(Text, Text, Text)

exact

public static Range exact(CharSequence row,
          CharSequence cf,
          CharSequence cq,
          CharSequence cv)

Creates a range that covers an exact row, column family, column qualifier, and visibility

See Also:

exact(Text, Text, Text, Text)

exact

public static Range exact(CharSequence row,
          CharSequence cf,
          CharSequence cq,
          CharSequence cv,
          long ts)

Creates a range that covers an exact row, column family, column qualifier, visibility, and timestamp

See Also:

exact(Text, Text, Text, Text, long)

prefix

public static Range prefix(CharSequence rowPrefix)

Returns a Range that covers all rows beginning with a prefix

See Also:

prefix(Text)

prefix

public static Range prefix(CharSequence row,
           CharSequence cfPrefix)

Returns a Range that covers all column families beginning with a prefix within a given row

See Also:

prefix(Text, Text)

prefix

public static Range prefix(CharSequence row,
           CharSequence cf,
           CharSequence cqPrefix)

Returns a Range that covers all column qualifiers beginning with a prefix within a given row and column family

See Also:

prefix(Text, Text, Text)

prefix

public static Range prefix(CharSequence row,
           CharSequence cf,
           CharSequence cq,
           CharSequence cvPrefix)

Returns a Range that covers all column visibilities beginning with a prefix within a given row, column family, and column qualifier

See Also:

prefix(Text, Text, Text, Text)