org.apache.velocity.util
Class MapFactory
java.lang.Object
org.apache.velocity.util.MapFactory
public class MapFactory
- extends Object
Factory class for creating Maps.
The main purpose of this class is to take advantage of Java 5
Concurrent classes if they are available. We use reflection to instantiate
java.util.concurrent classes to avoid compile time dependency on Java 5.
See Issue 607
for more info on this class.
- Since:
- 1.6
- Author:
- Jarkko Viinamaki
Method Summary |
static Map |
create(boolean allowNullKeys)
Creates a new instance of a class that implements Map interface
using the JDK defaults for initial size, load factor, etc. |
static Map |
create(int size,
float loadFactor,
int concurrencyLevel,
boolean allowNullKeys)
Creates a new instance of a class that implements Map interface. |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
MapFactory
public MapFactory()
create
public static Map create(boolean allowNullKeys)
- Creates a new instance of a class that implements Map interface
using the JDK defaults for initial size, load factor, etc.
Note that there is a small performance penalty because concurrent
maps are created using reflection.
- Parameters:
allowNullKeys
- if true, the returned Map instance supports null keys
- Returns:
- one of ConcurrentHashMap, HashMap, Hashtable
create
public static Map create(int size,
float loadFactor,
int concurrencyLevel,
boolean allowNullKeys)
- Creates a new instance of a class that implements Map interface.
Note that there is a small performance penalty because concurrent
maps are created using reflection.
- Parameters:
size
- initial size of the maploadFactor
- smaller value = better performance,
larger value = better memory utilizationconcurrencyLevel
- estimated number of writer Threads.
If this is smaller than 1, HashMap is always returned which is not
threadsafe.allowNullKeys
- if true, the returned Map instance supports null keys
- Returns:
- one of ConcurrentHashMap, HashMap, Hashtable
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