org.apache.cassandra.cql3

Class ColumnIdentifier

java.lang.Object

org.apache.cassandra.cql3.selection.Selectable

org.apache.cassandra.cql3.ColumnIdentifier

All Implemented Interfaces:

java.lang.Comparable<ColumnIdentifier>, IMeasurableMemory

public class ColumnIdentifier
extends Selectable
implements IMeasurableMemory, java.lang.Comparable<ColumnIdentifier>

Represents an identifer for a CQL column definition. TODO : should support light-weight mode without text representation for when not interned

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	ColumnIdentifier.ColumnIdentifierValue
static class	ColumnIdentifier.Literal
static interface	ColumnIdentifier.Raw Because Thrift-created tables may have a non-text comparator, we cannot determine the proper 'key' until we know the comparator.

Nested classes/interfaces inherited from class org.apache.cassandra.cql3.selection.Selectable

Selectable.WithFieldSelection, Selectable.WithFunction, Selectable.WritetimeOrTTL

Field Summary

Fields

Modifier and Type	Field and Description
java.nio.ByteBuffer	bytes
long	prefixComparison since these objects are compared frequently, we stash an efficiently compared prefix of the bytes, in the expectation that the majority of comparisons can be answered by this value only

Constructor Summary

Constructors

Constructor and Description
ColumnIdentifier(java.nio.ByteBuffer bytes, AbstractType<?> type)
ColumnIdentifier(java.lang.String rawText, boolean keepCase)

Method Summary

Modifier and Type	Method and Description
ColumnIdentifier	clone(AbstractAllocator allocator)
int	compareTo(ColumnIdentifier that)
boolean	equals(java.lang.Object o)
static ColumnIdentifier	getInterned(AbstractType<?> type, java.nio.ByteBuffer bytes, java.lang.String text)
static ColumnIdentifier	getInterned(java.nio.ByteBuffer bytes, AbstractType<?> type)
static ColumnIdentifier	getInterned(java.lang.String rawText, boolean keepCase)
int	hashCode()
boolean	isInterned()
static java.lang.String	maybeQuote(java.lang.String text)
Selector.Factory	newSelectorFactory(CFMetaData cfm, java.util.List<ColumnDefinition> defs)
java.lang.String	toCQLString() Returns a string representation of the identifier that is safe to use directly in CQL queries.
java.lang.String	toString()
long	unsharedHeapSize()
long	unsharedHeapSizeExcludingData()

Methods inherited from class org.apache.cassandra.cql3.selection.Selectable

addAndGetIndex

Methods inherited from class java.lang.Object

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

Field Detail

bytes

public final java.nio.ByteBuffer bytes

prefixComparison

public final long prefixComparison

since these objects are compared frequently, we stash an efficiently compared prefix of the bytes, in the expectation that the majority of comparisons can be answered by this value only

Constructor Detail

ColumnIdentifier

public ColumnIdentifier(java.lang.String rawText,
                        boolean keepCase)

ColumnIdentifier

public ColumnIdentifier(java.nio.ByteBuffer bytes,
                        AbstractType<?> type)

Method Detail

getInterned

public static ColumnIdentifier getInterned(java.nio.ByteBuffer bytes,
                                           AbstractType<?> type)

getInterned

public static ColumnIdentifier getInterned(java.lang.String rawText,
                                           boolean keepCase)

getInterned

public static ColumnIdentifier getInterned(AbstractType<?> type,
                                           java.nio.ByteBuffer bytes,
                                           java.lang.String text)

isInterned

public boolean isInterned()

hashCode

public final int hashCode()

Overrides:

hashCode in class java.lang.Object

equals

public final boolean equals(java.lang.Object o)

Overrides:

equals in class java.lang.Object

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

toCQLString

public java.lang.String toCQLString()

Returns a string representation of the identifier that is safe to use directly in CQL queries. In necessary, the string will be double-quoted, and any quotes inside the string will be escaped.

unsharedHeapSize

public long unsharedHeapSize()

Specified by:

unsharedHeapSize in interface IMeasurableMemory

Returns:

the amount of on-heap memory retained by the object that might be reclaimed if the object were reclaimed, i.e. it should try to exclude globally cached data where possible, or counting portions of arrays that are referenced by the object but used by other objects only (e.g. slabbed byte-buffers), etc.

unsharedHeapSizeExcludingData

public long unsharedHeapSizeExcludingData()

clone

public ColumnIdentifier clone(AbstractAllocator allocator)

newSelectorFactory

public Selector.Factory newSelectorFactory(CFMetaData cfm,
                                           java.util.List<ColumnDefinition> defs)
                                    throws InvalidRequestException

Specified by:

newSelectorFactory in class Selectable

Throws:

InvalidRequestException

compareTo

public int compareTo(ColumnIdentifier that)

Specified by:

compareTo in interface java.lang.Comparable<ColumnIdentifier>

maybeQuote

public static java.lang.String maybeQuote(java.lang.String text)