public class TransformedSplitMap<J,K,U,V> extends AbstractIterableGetMapDecorator<K,V> implements Put<J,U>, Serializable
Map to transform objects that are added.
The Map put methods and Map.Entry setValue method are affected by this class. Thus objects must be removed or searched for using their transformed form. For example, if the transformation converts Strings to Integers, you must use the Integer form to remove objects.
Note that TransformedMap is not synchronized and is not
thread-safe. If you wish to use this map from multiple threads
concurrently, you must use appropriate synchronization. The simplest approach
is to wrap this map using Collections.synchronizedMap(Map).
This class may throw exceptions when accessed by concurrent threads without
synchronization.
The "put" and "get" type constraints of this class are mutually independent;
contrast with TransformedMap which,
by virtue of its implementing Map<K, V>, must be constructed in such
a way that its read and write parameters are generalized to a common (super-)type.
In practice this would often mean >Object, Object>, defeating
much of the usefulness of having parameterized types.
On the downside, this class is not drop-in compatible with Map
but is intended to be worked with either directly or by Put and
Get generalizations.
SplitMapUtils.readableMap(Get),
SplitMapUtils.writableMap(Put),
Serialized Form| Modifier | Constructor and Description |
|---|---|
protected |
TransformedSplitMap(Map<K,V> map,
Transformer<? super J,? extends K> keyTransformer,
Transformer<? super U,? extends V> valueTransformer)
Constructor that wraps (not copies).
|
| Modifier and Type | Method and Description |
|---|---|
protected V |
checkSetValue(U value)
Override to transform the value when using
setValue. |
void |
clear() |
V |
put(J key,
U value)
Note that the return type is Object, rather than V as in the Map interface.
|
void |
putAll(Map<? extends J,? extends U> mapToCopy) |
static <J,K,U,V> TransformedSplitMap<J,K,U,V> |
transformingMap(Map<K,V> map,
Transformer<? super J,? extends K> keyTransformer,
Transformer<? super U,? extends V> valueTransformer)
Factory method to create a transforming map.
|
protected K |
transformKey(J object)
Transforms a key.
|
protected Map<K,V> |
transformMap(Map<? extends J,? extends U> map)
Transforms a map.
|
protected V |
transformValue(U object)
Transforms a value.
|
containsKey, containsValue, decorated, entrySet, equals, get, hashCode, isEmpty, keySet, mapIterator, remove, size, toString, valuesprotected TransformedSplitMap(Map<K,V> map, Transformer<? super J,? extends K> keyTransformer, Transformer<? super U,? extends V> valueTransformer)
If there are any elements already in the collection being decorated, they are NOT transformed.
map - the map to decorate, must not be nullkeyTransformer - the transformer to use for key conversion, null
means no conversionvalueTransformer - the transformer to use for value conversion, null
means no conversionIllegalArgumentException - if map is nullpublic static <J,K,U,V> TransformedSplitMap<J,K,U,V> transformingMap(Map<K,V> map, Transformer<? super J,? extends K> keyTransformer, Transformer<? super U,? extends V> valueTransformer)
If there are any elements already in the map being decorated, they are NOT transformed.
J - the input key typeK - the output key typeU - the input value typeV - the output value typemap - the map to decorate, must not be nullkeyTransformer - the transformer to use for key conversion, null
means no transformationvalueTransformer - the transformer to use for value conversion, null
means no transformationIllegalArgumentException - if map is nullprotected K transformKey(J object)
The transformer itself may throw an exception if necessary.
object - the object to transformprotected V transformValue(U object)
The transformer itself may throw an exception if necessary.
object - the object to transformprotected Map<K,V> transformMap(Map<? extends J,? extends U> map)
The transformer itself may throw an exception if necessary.
map - the map to transformprotected V checkSetValue(U value)
setValue.value - the value to transformpublic V put(J key, U value)
Putput in interface Put<J,U>Map.put(Object, Object)public void putAll(Map<? extends J,? extends U> mapToCopy)
putAll in interface Put<J,U>Map.putAll(Map)Copyright © 2001–2013 The Apache Software Foundation. All rights reserved.