Class EstraierPure::Condition
In: estraierpure.rb
Parent: Object

++ Abstraction of search condition.

Methods

add_attr   attrs   auxiliary   distinct   mask   max   new   options   order   phrase   set_auxiliary   set_distinct   set_mask   set_max   set_options   set_order   set_phrase   set_skip   skip  

Constants

SURE = 1 << 0   option: check every N-gram key
USUAL = 1 << 1   option: check N-gram keys skipping by one
FAST = 1 << 2   option: check N-gram keys skipping by two
AGITO = 1 << 3   option: check N-gram keys skipping by three
NOIDF = 1 << 4   option: without TF-IDF tuning
SIMPLE = 1 << 10   option: with the simplified phrase
ROUGH = 1 << 11   option: with the rough phrase
UNION = 1 << 15   option: with the union phrase
ISECT = 1 << 16   option: with the intersection phrase

Public Class methods

new()

Create a search condition object.

Public Instance methods

add_attr(expr)

Add an expression for an attribute. `expr’ specifies an expression for an attribute. The return value is always `nil’.

attrs()

Get expressions for attributes. The return value is expressions for attributes.

auxiliary()

Get permission to adopt result of the auxiliary index. The return value is permission to adopt result of the auxiliary index.

distinct()

Get the attribute distinction filter. The return value is the name of the distinct attribute.

mask()

Get the mask of targets of meta search. The return value is the mask of targets of meta search.

max()

Get the maximum number of retrieval. The return value is the maximum number of retrieval.

options()

Get options of retrieval. The return value is options by bitwise or.

order()

Get the order expression. The return value is the order expression.

phrase()

Get the search phrase. The return value is the search phrase.

set_auxiliary(min)

Set permission to adopt result of the auxiliary index. `min’ specifies the minimum hits to adopt result of the auxiliary index. If it is not more than 0, the auxiliary index is not used. By default, it is 32. The return value is always `nil’.

set_distinct(name)

Set the attribute distinction filter. `name’ specifies the name of an attribute to be distinct. The return value is always `nil’.

set_mask(mask)

Set the mask of targets of meta search. `mask’ specifies a masking number. 1 means the first target, 2 means the second target, 4 means the third target, and power values of 2 and their summation compose the mask. The return value is always `nil’.

set_max(max)

Set the maximum number of retrieval. `max’ specifies the maximum number of retrieval. By default, the number of retrieval is not limited. The return value is always `nil’.

set_options(options)

Set options of retrieval. `options’ specifies options: `Condition::SURE’ specifies that it checks every N-gram key, `Condition::USU’, which is the default, specifies that it checks N-gram keys with skipping one key, `Condition::FAST’ skips two keys, `Condition::AGITO’ skips three keys, `Condition::NOIDF’ specifies not to perform TF-IDF tuning, `Condition::SIMPLE’ specifies to use simplified phrase, `Condition::ROUGH’ specifies to use rough phrase, `Condition.UNION’ specifies to use union phrase, `Condition.ISECT’ specifies to use intersection phrase. Each option can be specified at the same time by bitwise or. If keys are skipped, though search speed is improved, the relevance ratio grows less. The return value is always `nil’.

set_order(expr)

Set the order of a condition object. `expr’ specifies an expression for the order. By default, the order is by score descending. The return value is always `nil’.

set_phrase(phrase)

Set the search phrase. `phrase’ specifies a search phrase. The return value is always `nil’.

set_skip(skip)

Set the number of skipped documents. `skip’ specifies the number of documents to be skipped in the search result. The return value is always `nil’.

skip()

Get the number of skipped documents. The return value is the number of documents to be skipped in the search result.

[Validate]