org.apache.drill.exec.store.sys

Class CaseInsensitivePersistentStore<V>

java.lang.Object

org.apache.drill.exec.store.sys.CaseInsensitivePersistentStore<V>

All Implemented Interfaces:

AutoCloseable, PersistentStore<V>, Store<V>

public class CaseInsensitivePersistentStore<V>
extends Object
implements PersistentStore<V>

Wrapper around PersistentStore to ensure all passed keys are converted to lower case and stored this way. This will ensure case-insensitivity during insert, update, deletion or search.

Constructor Summary

Constructors

Constructor and Description
CaseInsensitivePersistentStore(PersistentStore<V> underlyingStore)

Method Summary

Modifier and Type	Method and Description
void	close()
boolean	contains(String key) Checks if lookup key is present in store.
void	delete(String key) Removes the value corresponding to the given key if exists, nothing happens otherwise.
V	get(String key) Returns the value for the given key if exists, null otherwise.
Iterator<Map.Entry<String,V>>	getAll() Returns an iterator of entries.
PersistentStoreMode	getMode() Returns storage mode of this store.
Iterator<Map.Entry<String,V>>	getRange(int skip, int take) Returns an iterator of desired number of entries offsetting by the skip value.
void	put(String key, V value) Stores the (key, value) tuple in the store.
boolean	putIfAbsent(String key, V value) Stores the (key, value) tuple in the store only if it does not exists.

Methods inherited from class java.lang.Object

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

Constructor Detail

CaseInsensitivePersistentStore

public CaseInsensitivePersistentStore(PersistentStore<V> underlyingStore)

Method Detail

contains

public boolean contains(String key)

Description copied from interface: PersistentStore

Checks if lookup key is present in store.

Specified by:

contains in interface PersistentStore<V>

Parameters:

key - lookup key

Returns:

true if store contains lookup key, false otherwise

get

public V get(String key)

Description copied from interface: PersistentStore

Returns the value for the given key if exists, null otherwise.

Specified by:

get in interface PersistentStore<V>

Parameters:

key - lookup key

put

public void put(String key,
                V value)

Description copied from interface: PersistentStore

Stores the (key, value) tuple in the store. Lifetime of the tuple depends upon store mode.

Specified by:

put in interface PersistentStore<V>

Parameters:

key - lookup key

value - value to store

getAll

public Iterator<Map.Entry<String,V>> getAll()

Description copied from interface: PersistentStore

Returns an iterator of entries.

Specified by:

getAll in interface PersistentStore<V>

getMode

public PersistentStoreMode getMode()

Description copied from interface: Store

Returns storage mode of this store.

Specified by:

getMode in interface Store<V>

delete

public void delete(String key)

Description copied from interface: Store

Removes the value corresponding to the given key if exists, nothing happens otherwise.

Specified by:

delete in interface Store<V>

Parameters:

key - lookup key

putIfAbsent

public boolean putIfAbsent(String key,
                           V value)

Description copied from interface: Store

Stores the (key, value) tuple in the store only if it does not exists.

Specified by:

putIfAbsent in interface Store<V>

Parameters:

key - lookup key

value - value to store

Returns:

true if put takes place, false otherwise.

getRange

public Iterator<Map.Entry<String,V>> getRange(int skip,
                                              int take)

Description copied from interface: Store

Returns an iterator of desired number of entries offsetting by the skip value.

Specified by:

getRange in interface Store<V>

Parameters:

skip - number of records to skip from beginning

take - max number of records to return

close

public void close()
           throws Exception

Specified by:

close in interface AutoCloseable

Throws:

Exception