Package com.tangosol.util

Class LiteMap<K,V>

java.lang.Object

java.util.AbstractMap<K,V>

com.oracle.coherence.common.collections.InflatableMap<K,V>

com.tangosol.util.LiteMap<K,V>

All Implemented Interfaces:

ExternalizableLite, Externalizable, Serializable, Cloneable, Map<K,V>

Direct Known Subclasses:

JsonMap

public class LiteMap<K,V>
extends com.oracle.coherence.common.collections.InflatableMap<K,V>
implements ExternalizableLite

An implementation of java.util.Map that is optimal (in terms of both size and speed) for very small sets of data but still works excellently with large sets of data. This implementation is not thread-safe.

The LiteMap implementation switches at runtime between several different sub-implementations for storing the Map of objects, described here:

1. "empty map" - a map that contains no data;
2. "single entry" - a reference directly to a single map entry
3. "Object[]" - a reference to an array of entries; the item limit for this implementation is determined by the THRESHOLD constant;
4. "delegation" - for more than THRESHOLD items, a map is created to delegate the map management to; sub-classes can override the default delegation class (java.util.HashMap) by overriding the factory method instantiateMap.

The LiteMap implementation supports the null key value.

Author:

cp 06/29/99

See Also:

• Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class com.oracle.coherence.common.collections.InflatableMap

com.oracle.coherence.common.collections.InflatableMap.EntryIterator<K,V>, com.oracle.coherence.common.collections.InflatableMap.EntrySet

Nested classes/interfaces inherited from class java.util.AbstractMap

AbstractMap.SimpleEntry<K extends Object,V extends Object>, AbstractMap.SimpleImmutableEntry<K extends Object,V extends Object>

Nested classes/interfaces inherited from interface java.util.Map

Map.Entry<K extends Object,V extends Object>

Field Summary

Fields inherited from class com.oracle.coherence.common.collections.InflatableMap

I_OTHER, m_nImpl, m_oContents, THRESHOLD

Constructor Summary

Constructors

Constructor	Description
LiteMap()	Construct a LiteMap.
LiteMap(Map<? extends K,? extends V> map)	Construct a LiteMap with the same mappings as the given map.

Method Summary

Modifier and Type	Method	Description
void	readExternal(DataInput in)	Restore the contents of this object by loading the object's state from the passed DataInput object.
void	writeExternal(DataOutput out)	Save the contents of this object by storing the object's state into the passed DataOutput object.

Methods inherited from class com.oracle.coherence.common.collections.InflatableMap

checkShrinkFromOther, clear, clone, containsKey, ensureRuntimeException, entrySet, get, instantiateEntry, instantiateEntrySet, instantiateMap, isEmpty, put, readExternal, remove, size, writeExternal

Methods inherited from class java.util.AbstractMap

containsValue, equals, hashCode, keySet, putAll, toString, values

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Map

compute, computeIfAbsent, computeIfPresent, forEach, getOrDefault, merge, putIfAbsent, remove, replace, replace, replaceAll

Constructor Details

LiteMap

public LiteMap()

Construct a LiteMap.

LiteMap

public LiteMap(Map<? extends K,? extends V> map)

Construct a LiteMap with the same mappings as the given map.

Parameters:

map - the map whose mappings are to be placed in this map.

Method Details

readExternal

public void readExternal(DataInput in)
                  throws IOException

Restore the contents of this object by loading the object's state from the passed DataInput object.

Specified by:

readExternal in interface ExternalizableLite

Parameters:

in - the DataInput stream to read data from in order to restore the state of this object

Throws:

IOException - if an I/O exception occurs

NotActiveException - if the object is not in its initial state, and therefore cannot be deserialized into

writeExternal

public void writeExternal(DataOutput out)
                   throws IOException

Save the contents of this object by storing the object's state into the passed DataOutput object.

Specified by:

writeExternal in interface ExternalizableLite

Parameters:

out - the DataOutput stream to write the state of this object to

Throws:

IOException - if an I/O exception occurs