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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.ArrayFilter
com.tangosol.util.filter.AllFilter
public class AllFilter
Filter which returns the logical "and" of a filter array.
Nested Class Summary |
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Nested classes/interfaces inherited from class com.tangosol.util.filter.ArrayFilter |
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ArrayFilter.WeightedFilter |
Field Summary |
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Fields inherited from class com.tangosol.util.filter.ArrayFilter |
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m_aFilter |
Constructor Summary | |
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AllFilter()
Default constructor (necessary for the ExternalizableLite interface). |
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AllFilter(Filter[] afilter)
Construct an "all" filter. |
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. |
boolean |
evaluate(Object o)
Apply the test to the object. |
boolean |
evaluateEntry(Map.Entry entry)
Apply the test to a Map Entry. |
Methods inherited from class com.tangosol.util.filter.ArrayFilter |
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applyFilter, calculateFilters, equals, getFilters, hashCode, readExternal, readExternal, toString, writeExternal, writeExternal |
Methods inherited from class com.tangosol.util.BitHelper |
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countBits, countBits, countBits, indexOfLSB, indexOfLSB, indexOfLSB, indexOfMSB, indexOfMSB, indexOfMSB, toBitString, toBitString, toBitString |
Constructor Detail |
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public AllFilter()
public AllFilter(Filter[] afilter)
afilter[0] && afilter[1] ... && afilter[n]
afilter
- an array of filtersMethod Detail |
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public boolean evaluate(Object o)
public boolean evaluateEntry(Map.Entry entry)
entry
- the Map Entry to evaluate; never null
public 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.
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.
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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