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CoherenceTM v3.3 Copyright© 2000-2007 by Oracle Corporation |
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java.lang.Objectcom.tangosol.util.Base
com.tangosol.util.BitHelper
com.tangosol.util.ExternalizableHelper
com.tangosol.util.filter.ExtractorFilter
com.tangosol.util.filter.ComparisonFilter
com.tangosol.util.filter.ContainsAllFilter
public class ContainsAllFilter
Filter which tests a Collection
or Object array value returned from
a method invocation for containment of all values in a Set.
evaluate(o)
is functionally equivalent to the following
code:
return ((Collection) extract(o)).containsAll((Set) getValue());If the specified method returns an Object array,
evaluate(o)
is functionally equivalent to the following code:
return Collections.asList((Object[]) extract(o)).containsAll((Set) getValue());
Field Summary |
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Fields inherited from class com.tangosol.util.filter.ComparisonFilter |
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m_oValue |
Fields inherited from class com.tangosol.util.filter.ExtractorFilter |
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EVAL_COST, m_extractor |
Constructor Summary | |
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ContainsAllFilter()
Default constructor (necessary for the ExternalizableLite interface). |
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ContainsAllFilter(String sMethod,
Set setValues)
Construct an ContainsAllFilter for testing containment of the given Set of values. |
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ContainsAllFilter(ValueExtractor extractor,
Set setValues)
Construct an ContainsAllFilter for testing containment of the given Set of values. |
Method Summary | |
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Filter |
applyIndex(Map mapIndexes,
Set setKeys)
Filter remaining keys using a Map of available indexes. |
int |
calculateEffectiveness(Map mapIndexes,
Set setKeys)
Given a Map of available indexes, determine if this IndexAwareFilter can use any of the indexes to assist in its processing, and if so, determine how effective the use of that index would be. |
protected boolean |
evaluateExtracted(Object oExtracted)
Evaluate the specified extracted value. |
Methods inherited from class com.tangosol.util.filter.ComparisonFilter |
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equals, getValue, hashCode, readExternal, readExternal, toString, writeExternal, writeExternal |
Methods inherited from class com.tangosol.util.filter.ExtractorFilter |
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evaluate, evaluateEntry, extract, getValueExtractor |
Methods inherited from class com.tangosol.util.BitHelper |
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countBits, countBits, countBits, indexOfLSB, indexOfLSB, indexOfLSB, indexOfMSB, indexOfMSB, indexOfMSB, toBitString, toBitString, toBitString |
Methods inherited from interface com.tangosol.util.filter.EntryFilter |
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evaluateEntry |
Methods inherited from interface com.tangosol.util.Filter |
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evaluate |
Constructor Detail |
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public ContainsAllFilter()
public ContainsAllFilter(ValueExtractor extractor, Set setValues)
extractor
- the ValueExtractor used by this filtersetValues
- the Set of values that a Collection or Object array
is tested to containpublic ContainsAllFilter(String sMethod, Set setValues)
sMethod
- the name of the method to invoke via reflectionsetValues
- the Set of values that a Collection or Object array
is tested to containMethod Detail |
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protected boolean evaluateExtracted(Object oExtracted)
evaluateExtracted
in class ExtractorFilter
oExtracted
- an extracted value to evaluatepublic int calculateEffectiveness(Map mapIndexes, Set setKeys)
The returned value is an effectiveness estimate of how well this filter can use the specified indexes to filter the specified keys. An operation that requires no more than a single access to the index content (i.e. Equals, NotEquals) has an effectiveness of one. Evaluation of a single entry is assumed to have an effectiveness that depends on the index implementation and is usually measured as a constant number of the single operations. This number is referred to as evaluation cost.
If the effectiveness of a filter evaluates to a number larger than the keySet.size() * <evaluation cost> then a user could avoid using the index and iterate through the keySet calling evaluate rather then applyIndex.
calculateEffectiveness
in interface IndexAwareFilter
mapIndexes
- the available MapIndex objects keyed by the related
ValueExtractor; read-onlysetKeys
- the set of keys that will be filtered; read-only
public Filter applyIndex(Map mapIndexes, Set setKeys)
The filter is responsible for removing all keys from the passed set of
keys that the applicable indexes can prove should be filtered. If the
filter does not fully evaluate the remaining keys using just the index
information, it must return a filter (which may be an
EntryFilter
) that can complete the task using an iterating
implementation. If, on the other hand, the filter does fully evaluate
the remaining keys using just the index information, then it should
return null to indicate that no further filtering is necessary.
applyIndex
in interface IndexAwareFilter
mapIndexes
- the available MapIndex objects keyed by the related
ValueExtractor; read-onlysetKeys
- the mutable set of keys that remain to be filtered
Filter
object (which may be an EntryFilter
)
that can be used to process the remaining keys, or null if no
additional filter processing is necessary
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CoherenceTM v3.3 Copyright© 2000-2007 by Oracle Corporation |
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