Inherits ComparisonFilter, and IndexAwareFilter.
List of all members.
A pattern can include regular characters and wildcard characters '_' and ''.
During pattern matching, regular characters must exactly match the characters in an evaluated string. Wildcard character '_' (underscore) can be matched with any single character, and wildcard character '' can be matched with any string fragment of zero or more characters.
|LikeFilter Handle definition. |
|LikeFilter View definition. |
|LikeFilter Holder definition. |
Public Member Functions
|virtual size32_t||calculateEffectiveness (Map::View vMapIndexes, Set::View vSetKeys) const|
|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.|
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
|virtual Filter::View||applyIndex (Map::View vMapIndexes, Set::Handle hSetKeys) const|
|Filter remaining keys using a Map of available indexes.|
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.
|virtual void||readExternal (PofReader::Handle hIn)|
|virtual void||writeExternal (PofWriter::Handle hOut) const|
|virtual String::View||getPattern () const|
|Obtain the filter's pattern string. |
|virtual bool||isIgnoreCase () const|
|Check whether or not the filter is case incensitive. |
|virtual char16_t||getEscapeChar () const|
|Obtain the escape character that is used for escaping '' and '_' in the pattern or zero if there is no escape. |
|virtual void||showPlan (std::ostream &out) const|
|Display the execution plan that the LikeFilter has selected. |
Protected Member Functions
|Default constructor (necessary for the PortableObject interface). |
|LikeFilter (ValueExtractor::View vExtractor, String::View vsPattern, char16_t chEscape=(char16_t) 0, bool fIgnoreCase=false)|
|Construct a LikeFilter for pattern match. |
|virtual bool||evaluateExtracted (Object::View vExtracted) const|
|Evaluate the specified extracted value.|
|virtual void||buildPlan ()|
|Build a plan for processing the LIKE functionality. |
|virtual bool||isMatch (String::View vsValue) const|
|Check the passed String value to see if it matches the pattern that this filter was constructed with. |
|char16_t|| chEscape =
|bool|| fIgnoreCase = |
|virtual String::View getPattern||(||)|| const
Obtain the filter's pattern string.
|virtual bool isIgnoreCase||(||)|| const
Check whether or not the filter is case incensitive.
|virtual char16_t getEscapeChar||(||)|| const
Obtain the escape character that is used for escaping '' and '_' in the pattern or zero if there is no escape.
|virtual void showPlan||(||std::ostream &||out||)|| const
Display the execution plan that the LikeFilter has selected.
|out||the ostream to display the plan on|
|virtual bool isMatch||(||String::View||vsValue||)|| const
Check the passed String value to see if it matches the pattern that this filter was constructed with.
|vsValue||the String value to match against this filter's pattern|