public static class ConverterCollections.ConverterQueryMap extends ConverterCollections.ConverterMap implements QueryMap, Serializable
QueryMap.Entry<K,V>
Constructor and Description |
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ConverterQueryMap(QueryMap map, Converter convKeyUp, Converter convKeyDown, Converter convValUp, Converter convValDown)
Constructor.
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Modifier and Type | Method and Description |
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void |
addIndex(ValueExtractor extractor, boolean fOrdered, Comparator comparator)
Add an index to this QueryMap.
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Set |
entrySet(Filter filter)
Return a set view of the entries contained in this map that satisfy the criteria expressed by the filter.
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Set |
entrySet(Filter filter, Comparator comparator)
Return a set view of the entries contained in this map that satisfy the criteria expressed by the filter.
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QueryMap |
getQueryMap()
Return the underlying QueryMap.
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Set |
keySet(Filter filter)
Return a set view of the keys contained in this map for entries that satisfy the criteria expressed by the filter.
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void |
removeIndex(ValueExtractor extractor)
Remove an index from this QueryMap.
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getConverterKeyDown, getConverterKeyUp, getConverterValueDown, getConverterValueUp
clear, containsKey, containsValue, entrySet, equals, get, getMap, hashCode, instantiateCollection, instantiateEntrySet, instantiateMap, instantiateSet, isEmpty, keySet, put, putAll, remove, size, toString, values
clone, finalize, getClass, notify, notifyAll, wait, wait, wait
clear, compute, computeIfAbsent, computeIfPresent, containsKey, containsValue, entrySet, equals, get, getOrDefault, hashCode, isEmpty, keySet, merge, put, putAll, putIfAbsent, remove, remove, replace, replace, replaceAll, size, values
public ConverterQueryMap(QueryMap map, Converter convKeyUp, Converter convKeyDown, Converter convValUp, Converter convValDown)
map
- the underlying QueryMapconvKeyUp
- the Converter to view the underlying QueryMap's keys throughconvKeyDown
- the Converter to use to pass keys down to the underlying QueryMapconvValUp
- the Converter to view the underlying QueryMap's values throughconvValDown
- the Converter to use to pass values down to the underlying QueryMappublic Set keySet(Filter filter)
Unlike the Map.keySet()
method, the set returned by this method may not be backed by the map, so changes to the set may not reflected in the map, and vice-versa.
Note: When using the Coherence Enterprise Edition or Grid Edition, the Partitioned Cache implements the QueryMap interface using the Parallel Query feature. When using Coherence Standard Edition, the Parallel Query feature is not available, resulting in lower performance for most queries, and particularly when querying large data sets.
public Set entrySet(Filter filter)
Map.Entry
.
Unlike the Map.entrySet()
method, the set returned by this method may not be backed by the map, so changes to the set may not be reflected in the map, and vice-versa.
Note: When using the Coherence Enterprise Edition or Grid Edition, the Partitioned Cache implements the QueryMap interface using the Parallel Query feature. When using Coherence Standard Edition, the Parallel Query feature is not available, resulting in lower performance for most queries, and particularly when querying large data sets.
public Set entrySet(Filter filter, Comparator comparator)
Map.Entry
. It is further guaranteed that its iterator will traverse the set in such a way that the entry values come up in ascending order, sorted by the specified Comparator or according to the natural ordering (see Comparable
).
Unlike the Map.entrySet()
method, the set returned by this method may not be backed by the map, so changes to the set may not be reflected in the map, and vice-versa.
Note: When using the Coherence Enterprise Edition or Grid Edition, the Partitioned Cache implements the QueryMap interface using the Parallel Query feature. When using Coherence Standard Edition, the Parallel Query feature is not available, resulting in lower performance for most queries, and particularly when querying large data sets.
entrySet
in interface QueryMap
filter
- the Filter object representing the criteria that the entries of this map should satisfycomparator
- the Comparator object which imposes an ordering on entries in the resulting set; or null if the entries' values natural ordering should be usedChainedComparator
public void addIndex(ValueExtractor extractor, boolean fOrdered, Comparator comparator)
The ordering maintained by this map (as determined by either the specified Comparator or the natural ordering of the indexed values) must be consistent with equals (see Comparable
or Comparator
for a precise definition of consistent with equals.)
This method is only intended as a hint to the cache implementation, and as such it may be ignored by the cache if indexes are not supported or if the desired index (or a similar index) already exists. It is expected that an application will call this method to suggest an index even if the index may already exist, just so that the application is certain that index has been suggested. For example in a distributed environment, each server will likely suggest the same set of indexes when it starts, and there is no downside to the application blindly requesting those indexes regardless of whether another server has already requested the same indexes.
Note: Indexes are a feature of Coherence Enterprise Edition and Coherence Grid Edition. This method will have no effect when using Coherence Standard Edition.
addIndex
in interface QueryMap
extractor
- the ValueExtractor object that is used to extract an indexable Object from a value stored in the indexed Map. Must not be null.fOrdered
- true iff the contents of the indexed information should be ordered; false otherwisecomparator
- the Comparator object which imposes an ordering on entries in the indexed map; or null if the entries' values natural ordering should be usedReflectionExtractor
, ChainedComparator
public void removeIndex(ValueExtractor extractor)
removeIndex
in interface QueryMap
extractor
- the ValueExtractor object that is used to extract an indexable Object from a value stored in the Map.public QueryMap getQueryMap()