File: search_queries_fsq_score_funcs.go

package info (click to toggle)
golang-gopkg-olivere-elastic.v5 5.0.83-1
  • links: PTS, VCS
  • area: main
  • in suites: bullseye, sid
  • size: 2,848 kB
  • sloc: makefile: 18; sh: 2
file content (567 lines) | stat: -rw-r--r-- 18,268 bytes parent folder | download | duplicates (2)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
// Copyright 2012-present Oliver Eilhard. All rights reserved.
// Use of this source code is governed by a MIT-license.
// See http://olivere.mit-license.org/license.txt for details.

package elastic

import (
	"strings"
)

// ScoreFunction is used in combination with the Function Score Query.
type ScoreFunction interface {
	Name() string
	GetWeight() *float64 // returns the weight which must be serialized at the level of FunctionScoreQuery
	Source() (interface{}, error)
}

// -- Exponential Decay --

// ExponentialDecayFunction builds an exponential decay score function.
// See https://www.elastic.co/guide/en/elasticsearch/reference/5.2/query-dsl-function-score-query.html
// for details.
type ExponentialDecayFunction struct {
	fieldName      string
	origin         interface{}
	scale          interface{}
	decay          *float64
	offset         interface{}
	multiValueMode string
	weight         *float64
}

// NewExponentialDecayFunction creates a new ExponentialDecayFunction.
func NewExponentialDecayFunction() *ExponentialDecayFunction {
	return &ExponentialDecayFunction{}
}

// Name represents the JSON field name under which the output of Source
// needs to be serialized by FunctionScoreQuery (see FunctionScoreQuery.Source).
func (fn *ExponentialDecayFunction) Name() string {
	return "exp"
}

// FieldName specifies the name of the field to which this decay function is applied to.
func (fn *ExponentialDecayFunction) FieldName(fieldName string) *ExponentialDecayFunction {
	fn.fieldName = fieldName
	return fn
}

// Origin defines the "central point" by which the decay function calculates
// "distance".
func (fn *ExponentialDecayFunction) Origin(origin interface{}) *ExponentialDecayFunction {
	fn.origin = origin
	return fn
}

// Scale defines the scale to be used with Decay.
func (fn *ExponentialDecayFunction) Scale(scale interface{}) *ExponentialDecayFunction {
	fn.scale = scale
	return fn
}

// Decay defines how documents are scored at the distance given a Scale.
// If no decay is defined, documents at the distance Scale will be scored 0.5.
func (fn *ExponentialDecayFunction) Decay(decay float64) *ExponentialDecayFunction {
	fn.decay = &decay
	return fn
}

// Offset, if defined, computes the decay function only for a distance
// greater than the defined offset.
func (fn *ExponentialDecayFunction) Offset(offset interface{}) *ExponentialDecayFunction {
	fn.offset = offset
	return fn
}

// Weight adjusts the score of the score function.
// See https://www.elastic.co/guide/en/elasticsearch/reference/5.2/query-dsl-function-score-query.html#_using_function_score
// for details.
func (fn *ExponentialDecayFunction) Weight(weight float64) *ExponentialDecayFunction {
	fn.weight = &weight
	return fn
}

// GetWeight returns the adjusted score. It is part of the ScoreFunction interface.
// Returns nil if weight is not specified.
func (fn *ExponentialDecayFunction) GetWeight() *float64 {
	return fn.weight
}

// MultiValueMode specifies how the decay function should be calculated
// on a field that has multiple values.
// Valid modes are: min, max, avg, and sum.
func (fn *ExponentialDecayFunction) MultiValueMode(mode string) *ExponentialDecayFunction {
	fn.multiValueMode = mode
	return fn
}

// Source returns the serializable JSON data of this score function.
func (fn *ExponentialDecayFunction) Source() (interface{}, error) {
	source := make(map[string]interface{})
	params := make(map[string]interface{})
	source[fn.fieldName] = params
	if fn.origin != nil {
		params["origin"] = fn.origin
	}
	params["scale"] = fn.scale
	if fn.decay != nil && *fn.decay > 0 {
		params["decay"] = *fn.decay
	}
	if fn.offset != nil {
		params["offset"] = fn.offset
	}
	if fn.multiValueMode != "" {
		source["multi_value_mode"] = fn.multiValueMode
	}
	return source, nil
}

// -- Gauss Decay --

// GaussDecayFunction builds a gauss decay score function.
// See https://www.elastic.co/guide/en/elasticsearch/reference/5.2/query-dsl-function-score-query.html
// for details.
type GaussDecayFunction struct {
	fieldName      string
	origin         interface{}
	scale          interface{}
	decay          *float64
	offset         interface{}
	multiValueMode string
	weight         *float64
}

// NewGaussDecayFunction returns a new GaussDecayFunction.
func NewGaussDecayFunction() *GaussDecayFunction {
	return &GaussDecayFunction{}
}

// Name represents the JSON field name under which the output of Source
// needs to be serialized by FunctionScoreQuery (see FunctionScoreQuery.Source).
func (fn *GaussDecayFunction) Name() string {
	return "gauss"
}

// FieldName specifies the name of the field to which this decay function is applied to.
func (fn *GaussDecayFunction) FieldName(fieldName string) *GaussDecayFunction {
	fn.fieldName = fieldName
	return fn
}

// Origin defines the "central point" by which the decay function calculates
// "distance".
func (fn *GaussDecayFunction) Origin(origin interface{}) *GaussDecayFunction {
	fn.origin = origin
	return fn
}

// Scale defines the scale to be used with Decay.
func (fn *GaussDecayFunction) Scale(scale interface{}) *GaussDecayFunction {
	fn.scale = scale
	return fn
}

// Decay defines how documents are scored at the distance given a Scale.
// If no decay is defined, documents at the distance Scale will be scored 0.5.
func (fn *GaussDecayFunction) Decay(decay float64) *GaussDecayFunction {
	fn.decay = &decay
	return fn
}

// Offset, if defined, computes the decay function only for a distance
// greater than the defined offset.
func (fn *GaussDecayFunction) Offset(offset interface{}) *GaussDecayFunction {
	fn.offset = offset
	return fn
}

// Weight adjusts the score of the score function.
// See https://www.elastic.co/guide/en/elasticsearch/reference/5.2/query-dsl-function-score-query.html#_using_function_score
// for details.
func (fn *GaussDecayFunction) Weight(weight float64) *GaussDecayFunction {
	fn.weight = &weight
	return fn
}

// GetWeight returns the adjusted score. It is part of the ScoreFunction interface.
// Returns nil if weight is not specified.
func (fn *GaussDecayFunction) GetWeight() *float64 {
	return fn.weight
}

// MultiValueMode specifies how the decay function should be calculated
// on a field that has multiple values.
// Valid modes are: min, max, avg, and sum.
func (fn *GaussDecayFunction) MultiValueMode(mode string) *GaussDecayFunction {
	fn.multiValueMode = mode
	return fn
}

// Source returns the serializable JSON data of this score function.
func (fn *GaussDecayFunction) Source() (interface{}, error) {
	source := make(map[string]interface{})
	params := make(map[string]interface{})
	source[fn.fieldName] = params
	if fn.origin != nil {
		params["origin"] = fn.origin
	}
	params["scale"] = fn.scale
	if fn.decay != nil && *fn.decay > 0 {
		params["decay"] = *fn.decay
	}
	if fn.offset != nil {
		params["offset"] = fn.offset
	}
	if fn.multiValueMode != "" {
		source["multi_value_mode"] = fn.multiValueMode
	}
	// Notice that the weight has to be serialized in FunctionScoreQuery.
	return source, nil
}

// -- Linear Decay --

// LinearDecayFunction builds a linear decay score function.
// See https://www.elastic.co/guide/en/elasticsearch/reference/5.2/query-dsl-function-score-query.html
// for details.
type LinearDecayFunction struct {
	fieldName      string
	origin         interface{}
	scale          interface{}
	decay          *float64
	offset         interface{}
	multiValueMode string
	weight         *float64
}

// NewLinearDecayFunction initializes and returns a new LinearDecayFunction.
func NewLinearDecayFunction() *LinearDecayFunction {
	return &LinearDecayFunction{}
}

// Name represents the JSON field name under which the output of Source
// needs to be serialized by FunctionScoreQuery (see FunctionScoreQuery.Source).
func (fn *LinearDecayFunction) Name() string {
	return "linear"
}

// FieldName specifies the name of the field to which this decay function is applied to.
func (fn *LinearDecayFunction) FieldName(fieldName string) *LinearDecayFunction {
	fn.fieldName = fieldName
	return fn
}

// Origin defines the "central point" by which the decay function calculates
// "distance".
func (fn *LinearDecayFunction) Origin(origin interface{}) *LinearDecayFunction {
	fn.origin = origin
	return fn
}

// Scale defines the scale to be used with Decay.
func (fn *LinearDecayFunction) Scale(scale interface{}) *LinearDecayFunction {
	fn.scale = scale
	return fn
}

// Decay defines how documents are scored at the distance given a Scale.
// If no decay is defined, documents at the distance Scale will be scored 0.5.
func (fn *LinearDecayFunction) Decay(decay float64) *LinearDecayFunction {
	fn.decay = &decay
	return fn
}

// Offset, if defined, computes the decay function only for a distance
// greater than the defined offset.
func (fn *LinearDecayFunction) Offset(offset interface{}) *LinearDecayFunction {
	fn.offset = offset
	return fn
}

// Weight adjusts the score of the score function.
// See https://www.elastic.co/guide/en/elasticsearch/reference/5.2/query-dsl-function-score-query.html#_using_function_score
// for details.
func (fn *LinearDecayFunction) Weight(weight float64) *LinearDecayFunction {
	fn.weight = &weight
	return fn
}

// GetWeight returns the adjusted score. It is part of the ScoreFunction interface.
// Returns nil if weight is not specified.
func (fn *LinearDecayFunction) GetWeight() *float64 {
	return fn.weight
}

// MultiValueMode specifies how the decay function should be calculated
// on a field that has multiple values.
// Valid modes are: min, max, avg, and sum.
func (fn *LinearDecayFunction) MultiValueMode(mode string) *LinearDecayFunction {
	fn.multiValueMode = mode
	return fn
}

// GetMultiValueMode returns how the decay function should be calculated
// on a field that has multiple values.
// Valid modes are: min, max, avg, and sum.
func (fn *LinearDecayFunction) GetMultiValueMode() string {
	return fn.multiValueMode
}

// Source returns the serializable JSON data of this score function.
func (fn *LinearDecayFunction) Source() (interface{}, error) {
	source := make(map[string]interface{})
	params := make(map[string]interface{})
	source[fn.fieldName] = params
	if fn.origin != nil {
		params["origin"] = fn.origin
	}
	params["scale"] = fn.scale
	if fn.decay != nil && *fn.decay > 0 {
		params["decay"] = *fn.decay
	}
	if fn.offset != nil {
		params["offset"] = fn.offset
	}
	if fn.multiValueMode != "" {
		source["multi_value_mode"] = fn.multiValueMode
	}
	// Notice that the weight has to be serialized in FunctionScoreQuery.
	return source, nil
}

// -- Script --

// ScriptFunction builds a script score function. It uses a script to
// compute or influence the score of documents that match with the inner
// query or filter.
//
// See https://www.elastic.co/guide/en/elasticsearch/reference/5.2/query-dsl-function-score-query.html#_script_score
// for details.
type ScriptFunction struct {
	script *Script
	weight *float64
}

// NewScriptFunction initializes and returns a new ScriptFunction.
func NewScriptFunction(script *Script) *ScriptFunction {
	return &ScriptFunction{
		script: script,
	}
}

// Name represents the JSON field name under which the output of Source
// needs to be serialized by FunctionScoreQuery (see FunctionScoreQuery.Source).
func (fn *ScriptFunction) Name() string {
	return "script_score"
}

// Script specifies the script to be executed.
func (fn *ScriptFunction) Script(script *Script) *ScriptFunction {
	fn.script = script
	return fn
}

// Weight adjusts the score of the score function.
// See https://www.elastic.co/guide/en/elasticsearch/reference/5.2/query-dsl-function-score-query.html#_using_function_score
// for details.
func (fn *ScriptFunction) Weight(weight float64) *ScriptFunction {
	fn.weight = &weight
	return fn
}

// GetWeight returns the adjusted score. It is part of the ScoreFunction interface.
// Returns nil if weight is not specified.
func (fn *ScriptFunction) GetWeight() *float64 {
	return fn.weight
}

// Source returns the serializable JSON data of this score function.
func (fn *ScriptFunction) Source() (interface{}, error) {
	source := make(map[string]interface{})
	if fn.script != nil {
		src, err := fn.script.Source()
		if err != nil {
			return nil, err
		}
		source["script"] = src
	}
	// Notice that the weight has to be serialized in FunctionScoreQuery.
	return source, nil
}

// -- Field value factor --

// FieldValueFactorFunction is a function score function that allows you
// to use a field from a document to influence the score.
// See https://www.elastic.co/guide/en/elasticsearch/reference/5.2/query-dsl-function-score-query.html#_field_value_factor.
type FieldValueFactorFunction struct {
	field    string
	factor   *float64
	missing  *float64
	weight   *float64
	modifier string
}

// NewFieldValueFactorFunction initializes and returns a new FieldValueFactorFunction.
func NewFieldValueFactorFunction() *FieldValueFactorFunction {
	return &FieldValueFactorFunction{}
}

// Name represents the JSON field name under which the output of Source
// needs to be serialized by FunctionScoreQuery (see FunctionScoreQuery.Source).
func (fn *FieldValueFactorFunction) Name() string {
	return "field_value_factor"
}

// Field is the field to be extracted from the document.
func (fn *FieldValueFactorFunction) Field(field string) *FieldValueFactorFunction {
	fn.field = field
	return fn
}

// Factor is the (optional) factor to multiply the field with. If you do not
// specify a factor, the default is 1.
func (fn *FieldValueFactorFunction) Factor(factor float64) *FieldValueFactorFunction {
	fn.factor = &factor
	return fn
}

// Modifier to apply to the field value. It can be one of: none, log, log1p,
// log2p, ln, ln1p, ln2p, square, sqrt, or reciprocal. Defaults to: none.
func (fn *FieldValueFactorFunction) Modifier(modifier string) *FieldValueFactorFunction {
	fn.modifier = modifier
	return fn
}

// Weight adjusts the score of the score function.
// See https://www.elastic.co/guide/en/elasticsearch/reference/5.2/query-dsl-function-score-query.html#_using_function_score
// for details.
func (fn *FieldValueFactorFunction) Weight(weight float64) *FieldValueFactorFunction {
	fn.weight = &weight
	return fn
}

// GetWeight returns the adjusted score. It is part of the ScoreFunction interface.
// Returns nil if weight is not specified.
func (fn *FieldValueFactorFunction) GetWeight() *float64 {
	return fn.weight
}

// Missing is used if a document does not have that field.
func (fn *FieldValueFactorFunction) Missing(missing float64) *FieldValueFactorFunction {
	fn.missing = &missing
	return fn
}

// Source returns the serializable JSON data of this score function.
func (fn *FieldValueFactorFunction) Source() (interface{}, error) {
	source := make(map[string]interface{})
	if fn.field != "" {
		source["field"] = fn.field
	}
	if fn.factor != nil {
		source["factor"] = *fn.factor
	}
	if fn.missing != nil {
		source["missing"] = *fn.missing
	}
	if fn.modifier != "" {
		source["modifier"] = strings.ToLower(fn.modifier)
	}
	// Notice that the weight has to be serialized in FunctionScoreQuery.
	return source, nil
}

// -- Weight Factor --

// WeightFactorFunction builds a weight factor function that multiplies
// the weight to the score.
// See https://www.elastic.co/guide/en/elasticsearch/reference/5.2/query-dsl-function-score-query.html#_weight
// for details.
type WeightFactorFunction struct {
	weight float64
}

// NewWeightFactorFunction initializes and returns a new WeightFactorFunction.
func NewWeightFactorFunction(weight float64) *WeightFactorFunction {
	return &WeightFactorFunction{weight: weight}
}

// Name represents the JSON field name under which the output of Source
// needs to be serialized by FunctionScoreQuery (see FunctionScoreQuery.Source).
func (fn *WeightFactorFunction) Name() string {
	return "weight"
}

// Weight adjusts the score of the score function.
// See https://www.elastic.co/guide/en/elasticsearch/reference/5.2/query-dsl-function-score-query.html#_using_function_score
// for details.
func (fn *WeightFactorFunction) Weight(weight float64) *WeightFactorFunction {
	fn.weight = weight
	return fn
}

// GetWeight returns the adjusted score. It is part of the ScoreFunction interface.
// Returns nil if weight is not specified.
func (fn *WeightFactorFunction) GetWeight() *float64 {
	return &fn.weight
}

// Source returns the serializable JSON data of this score function.
func (fn *WeightFactorFunction) Source() (interface{}, error) {
	// Notice that the weight has to be serialized in FunctionScoreQuery.
	return fn.weight, nil
}

// -- Random --

// RandomFunction builds a random score function.
// See https://www.elastic.co/guide/en/elasticsearch/reference/5.2/query-dsl-function-score-query.html#_random
// for details.
type RandomFunction struct {
	seed   interface{}
	weight *float64
}

// NewRandomFunction initializes and returns a new RandomFunction.
func NewRandomFunction() *RandomFunction {
	return &RandomFunction{}
}

// Name represents the JSON field name under which the output of Source
// needs to be serialized by FunctionScoreQuery (see FunctionScoreQuery.Source).
func (fn *RandomFunction) Name() string {
	return "random_score"
}

// Seed is documented in 1.6 as a numeric value. However, in the source code
// of the Java client, it also accepts strings. So we accept both here, too.
func (fn *RandomFunction) Seed(seed interface{}) *RandomFunction {
	fn.seed = seed
	return fn
}

// Weight adjusts the score of the score function.
// See https://www.elastic.co/guide/en/elasticsearch/reference/5.2/query-dsl-function-score-query.html#_using_function_score
// for details.
func (fn *RandomFunction) Weight(weight float64) *RandomFunction {
	fn.weight = &weight
	return fn
}

// GetWeight returns the adjusted score. It is part of the ScoreFunction interface.
// Returns nil if weight is not specified.
func (fn *RandomFunction) GetWeight() *float64 {
	return fn.weight
}

// Source returns the serializable JSON data of this score function.
func (fn *RandomFunction) Source() (interface{}, error) {
	source := make(map[string]interface{})
	if fn.seed != nil {
		source["seed"] = fn.seed
	}
	// Notice that the weight has to be serialized in FunctionScoreQuery.
	return source, nil
}