-
Notifications
You must be signed in to change notification settings - Fork 2.1k
/
key_condition.go
561 lines (529 loc) · 22.2 KB
/
key_condition.go
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
package expression
import (
"fmt"
)
// keyConditionMode specifies the types of the struct KeyConditionBuilder,
// representing the different types of KeyConditions (i.e. And, Or, Between, ...)
type keyConditionMode int
const (
// unsetKeyCond catches errors for unset KeyConditionBuilder structs
unsetKeyCond keyConditionMode = iota
// invalidKeyCond catches errors in the construction of KeyConditionBuilder structs
invalidKeyCond
// equalKeyCond represents the Equals KeyCondition
equalKeyCond
// lessThanKeyCond represents the Less Than KeyCondition
lessThanKeyCond
// lessThanEqualKeyCond represents the Less Than Or Equal To KeyCondition
lessThanEqualKeyCond
// greaterThanKeyCond represents the Greater Than KeyCondition
greaterThanKeyCond
// greaterThanEqualKeyCond represents the Greater Than Or Equal To KeyCondition
greaterThanEqualKeyCond
// andKeyCond represents the Logical And KeyCondition
andKeyCond
// betweenKeyCond represents the Between KeyCondition
betweenKeyCond
// beginsWithKeyCond represents the Begins With KeyCondition
beginsWithKeyCond
)
// KeyConditionBuilder represents Key Condition Expressions in DynamoDB.
// KeyConditionBuilders are the building blocks of Expressions.
// More Information at: http://docs.aws.amazon.com/amazondynamodb/latest/developerguide/Query.html#Query.KeyConditionExpressions
type KeyConditionBuilder struct {
operandList []OperandBuilder
keyConditionList []KeyConditionBuilder
mode keyConditionMode
}
// KeyEqual returns a KeyConditionBuilder representing the equality clause
// of the two argument OperandBuilders. The resulting KeyConditionBuilder can be
// used as a part of other Key Condition Expressions or as an argument to the
// WithKeyCondition() method for the Builder struct.
//
// Example:
//
// // keyCondition represents the equal clause of the key "foo" and the
// // value 5
// keyCondition := expression.KeyEqual(expression.Key("foo"), expression.Value(5))
//
// // Used in another Key Condition Expression
// anotherKeyCondition := expression.Key("partitionKey").Equal(expression.Value("aValue")).And(keyCondition)
// // Used to make an Builder
// builder := expression.NewBuilder().WithKeyCondition(keyCondition)
//
// Expression Equivalent:
//
// expression.KeyEqual(expression.Key("foo"), expression.Value(5))
// // Let :five be an ExpressionAttributeValue representing the value 5
// "foo = :five"
func KeyEqual(keyBuilder KeyBuilder, valueBuilder ValueBuilder) KeyConditionBuilder {
return KeyConditionBuilder{
operandList: []OperandBuilder{keyBuilder, valueBuilder},
mode: equalKeyCond,
}
}
// Equal returns a KeyConditionBuilder representing the equality clause of
// the two argument OperandBuilders. The resulting KeyConditionBuilder can be
// used as a part of other Key Condition Expressions or as an argument to the
// WithKeyCondition() method for the Builder struct.
//
// Example:
//
// // keyCondition represents the equal clause of the key "foo" and the
// // value 5
// keyCondition := expression.Key("foo").Equal(expression.Value(5))
//
// // Used in another Key Condition Expression
// anotherKeyCondition := expression.Key("partitionKey").Equal(expression.Value("aValue")).And(keyCondition)
// // Used to make an Builder
// builder := expression.NewBuilder().WithKeyCondition(keyCondition)
//
// Expression Equivalent:
//
// expression.Key("foo").Equal(expression.Value(5))
// // Let :five be an ExpressionAttributeValue representing the value 5
// "foo = :five"
func (kb KeyBuilder) Equal(valueBuilder ValueBuilder) KeyConditionBuilder {
return KeyEqual(kb, valueBuilder)
}
// KeyLessThan returns a KeyConditionBuilder representing the less than
// clause of the two argument OperandBuilders. The resulting KeyConditionBuilder
// can be used as a part of other Key Condition Expressions.
//
// Example:
//
// // keyCondition represents the less than clause of the key "foo" and the
// // value 5
// keyCondition := expression.KeyLessThan(expression.Key("foo"), expression.Value(5))
//
// // Used in another Key Condition Expression
// anotherKeyCondition := expression.Key("partitionKey").Equal(expression.Value("aValue")).And(keyCondition)
//
// Expression Equivalent:
//
// expression.KeyLessThan(expression.Key("foo"), expression.Value(5))
// // Let :five be an ExpressionAttributeValue representing the value 5
// "foo < :five"
func KeyLessThan(keyBuilder KeyBuilder, valueBuilder ValueBuilder) KeyConditionBuilder {
return KeyConditionBuilder{
operandList: []OperandBuilder{keyBuilder, valueBuilder},
mode: lessThanKeyCond,
}
}
// LessThan returns a KeyConditionBuilder representing the less than clause
// of the two argument OperandBuilders. The resulting KeyConditionBuilder can be
// used as a part of other Key Condition Expressions.
//
// Example:
//
// // keyCondition represents the less than clause of the key "foo" and the
// // value 5
// keyCondition := expression.Key("foo").LessThan(expression.Value(5))
//
// // Used in another Key Condition Expression
// anotherKeyCondition := expression.Key("partitionKey").Equal(expression.Value("aValue")).And(keyCondition)
//
// Expression Equivalent:
//
// expression.Key("foo").LessThan(expression.Value(5))
// // Let :five be an ExpressionAttributeValue representing the value 5
// "foo < :five"
func (kb KeyBuilder) LessThan(valueBuilder ValueBuilder) KeyConditionBuilder {
return KeyLessThan(kb, valueBuilder)
}
// KeyLessThanEqual returns a KeyConditionBuilder representing the less than
// equal to clause of the two argument OperandBuilders. The resulting
// KeyConditionBuilder can be used as a part of other Key Condition Expressions.
//
// Example:
//
// // keyCondition represents the less than equal to clause of the key
// // "foo" and the value 5
// keyCondition := expression.KeyLessThanEqual(expression.Key("foo"), expression.Value(5))
//
// // Used in another Key Condition Expression
// anotherKeyCondition := expression.Key("partitionKey").Equal(expression.Value("aValue")).And(keyCondition)
//
// Expression Equivalent:
//
// expression.KeyLessThanEqual(expression.Key("foo"), expression.Value(5))
// // Let :five be an ExpressionAttributeValue representing the value 5
// "foo <= :five"
func KeyLessThanEqual(keyBuilder KeyBuilder, valueBuilder ValueBuilder) KeyConditionBuilder {
return KeyConditionBuilder{
operandList: []OperandBuilder{keyBuilder, valueBuilder},
mode: lessThanEqualKeyCond,
}
}
// LessThanEqual returns a KeyConditionBuilder representing the less than
// equal to clause of the two argument OperandBuilders. The resulting
// KeyConditionBuilder can be used as a part of other Key Condition Expressions.
//
// Example:
//
// // keyCondition represents the less than equal to clause of the key
// // "foo" and the value 5
// keyCondition := expression.Key("foo").LessThanEqual(expression.Value(5))
//
// // Used in another Key Condition Expression
// anotherKeyCondition := expression.Key("partitionKey").Equal(expression.Value("aValue")).And(keyCondition)
//
// Expression Equivalent:
//
// expression.Key("foo").LessThanEqual(expression.Value(5))
// // Let :five be an ExpressionAttributeValue representing the value 5
// "foo <= :five"
func (kb KeyBuilder) LessThanEqual(valueBuilder ValueBuilder) KeyConditionBuilder {
return KeyLessThanEqual(kb, valueBuilder)
}
// KeyGreaterThan returns a KeyConditionBuilder representing the greater
// than clause of the two argument OperandBuilders. The resulting
// KeyConditionBuilder can be used as a part of other Key Condition Expressions.
//
// Example:
//
// // keyCondition represents the greater than clause of the key "foo" and
// // the value 5
// keyCondition := expression.KeyGreaterThan(expression.Key("foo"), expression.Value(5))
//
// // Used in another Key Condition Expression
// anotherKeyCondition := expression.Key("partitionKey").Equal(expression.Value("aValue")).And(keyCondition)
//
// Expression Equivalent:
//
// expression.KeyGreaterThan(expression.Key("foo"), expression.Value(5))
// // Let :five be an ExpressionAttributeValue representing the value 5
// "foo > :five"
func KeyGreaterThan(keyBuilder KeyBuilder, valueBuilder ValueBuilder) KeyConditionBuilder {
return KeyConditionBuilder{
operandList: []OperandBuilder{keyBuilder, valueBuilder},
mode: greaterThanKeyCond,
}
}
// GreaterThan returns a KeyConditionBuilder representing the greater than
// clause of the two argument OperandBuilders. The resulting KeyConditionBuilder
// can be used as a part of other Key Condition Expressions.
//
// Example:
//
// // key condition represents the greater than clause of the key "foo" and
// // the value 5
// keyCondition := expression.Key("foo").GreaterThan(expression.Value(5))
//
// // Used in another Key Condition Expression
// anotherKeyCondition := expression.Key("partitionKey").Equal(expression.Value("aValue")).And(keyCondition)
//
// Expression Equivalent:
//
// expression.Key("foo").GreaterThan(expression.Value(5))
// // Let :five be an ExpressionAttributeValue representing the value 5
// "foo > :five"
func (kb KeyBuilder) GreaterThan(valueBuilder ValueBuilder) KeyConditionBuilder {
return KeyGreaterThan(kb, valueBuilder)
}
// KeyGreaterThanEqual returns a KeyConditionBuilder representing the
// greater than equal to clause of the two argument OperandBuilders. The
// resulting KeyConditionBuilder can be used as a part of other Key Condition
// Expressions.
//
// Example:
//
// // keyCondition represents the greater than equal to clause of the key
// // "foo" and the value 5
// keyCondition := expression.KeyGreaterThanEqual(expression.Key("foo"), expression.Value(5))
//
// // Used in another Key Condition Expression
// anotherKeyCondition := expression.Key("partitionKey").Equal(expression.Value("aValue")).And(keyCondition)
//
// Expression Equivalent:
//
// expression.KeyGreaterThanEqual(expression.Key("foo"), expression.Value(5))
// // Let :five be an ExpressionAttributeValue representing the value 5
// "foo >= :five"
func KeyGreaterThanEqual(keyBuilder KeyBuilder, valueBuilder ValueBuilder) KeyConditionBuilder {
return KeyConditionBuilder{
operandList: []OperandBuilder{keyBuilder, valueBuilder},
mode: greaterThanEqualKeyCond,
}
}
// GreaterThanEqual returns a KeyConditionBuilder representing the greater
// than equal to clause of the two argument OperandBuilders. The resulting
// KeyConditionBuilder can be used as a part of other Key Condition Expressions.
//
// Example:
//
// // keyCondition represents the greater than equal to clause of the key
// // "foo" and the value 5
// keyCondition := expression.Key("foo").GreaterThanEqual(expression.Value(5))
//
// // Used in another Key Condition Expression
// anotherKeyCondition := expression.Key("partitionKey").Equal(expression.Value("aValue")).And(keyCondition)
//
// Expression Equivalent:
//
// expression.Key("foo").GreaterThanEqual(expression.Value(5))
// // Let :five be an ExpressionAttributeValue representing the value 5
// "foo >= :five"
func (kb KeyBuilder) GreaterThanEqual(valueBuilder ValueBuilder) KeyConditionBuilder {
return KeyGreaterThanEqual(kb, valueBuilder)
}
// KeyAnd returns a KeyConditionBuilder representing the logical AND clause
// of the two argument KeyConditionBuilders. The resulting KeyConditionBuilder
// can be used as an argument to the WithKeyCondition() method for the Builder
// struct.
//
// Example:
//
// // keyCondition represents the key condition where the partition key
// // "TeamName" is equal to value "Wildcats" and sort key "Number" is equal
// // to value 1
// keyCondition := expression.KeyAnd(expression.Key("TeamName").Equal(expression.Value("Wildcats")), expression.Key("Number").Equal(expression.Value(1)))
//
// // Used to make an Builder
// builder := expression.NewBuilder().WithKeyCondition(keyCondition)
//
// Expression Equivalent:
//
// expression.KeyAnd(expression.Key("TeamName").Equal(expression.Value("Wildcats")), expression.Key("Number").Equal(expression.Value(1)))
// // Let #NUMBER, :teamName, and :one be ExpressionAttributeName and
// // ExpressionAttributeValues representing the item attribute "Number",
// // the value "Wildcats", and the value 1
// "(TeamName = :teamName) AND (#NUMBER = :one)"
func KeyAnd(left, right KeyConditionBuilder) KeyConditionBuilder {
if left.mode != equalKeyCond {
return KeyConditionBuilder{
mode: invalidKeyCond,
}
}
if right.mode == andKeyCond {
return KeyConditionBuilder{
mode: invalidKeyCond,
}
}
return KeyConditionBuilder{
keyConditionList: []KeyConditionBuilder{left, right},
mode: andKeyCond,
}
}
// And returns a KeyConditionBuilder representing the logical AND clause of
// the two argument KeyConditionBuilders. The resulting KeyConditionBuilder can
// be used as an argument to the WithKeyCondition() method for the Builder
// struct.
//
// Example:
//
// // keyCondition represents the key condition where the partition key
// // "TeamName" is equal to value "Wildcats" and sort key "Number" is equal
// // to value 1
// keyCondition := expression.Key("TeamName").Equal(expression.Value("Wildcats")).And(expression.Key("Number").Equal(expression.Value(1)))
//
// // Used to make an Builder
// builder := expression.NewBuilder().WithKeyCondition(keyCondition)
//
// Expression Equivalent:
//
// expression.Key("TeamName").Equal(expression.Value("Wildcats")).And(expression.Key("Number").Equal(expression.Value(1)))
// // Let #NUMBER, :teamName, and :one be ExpressionAttributeName and
// // ExpressionAttributeValues representing the item attribute "Number",
// // the value "Wildcats", and the value 1
// "(TeamName = :teamName) AND (#NUMBER = :one)"
func (kcb KeyConditionBuilder) And(right KeyConditionBuilder) KeyConditionBuilder {
return KeyAnd(kcb, right)
}
// KeyBetween returns a KeyConditionBuilder representing the result of the
// BETWEEN function in DynamoDB Key Condition Expressions. The resulting
// KeyConditionBuilder can be used as a part of other Key Condition Expressions.
//
// Example:
//
// // keyCondition represents the boolean key condition of whether the value
// // of the key "foo" is between values 5 and 10
// keyCondition := expression.KeyBetween(expression.Key("foo"), expression.Value(5), expression.Value(10))
//
// // Used in another Key Condition Expression
// anotherKeyCondition := expression.Key("partitionKey").Equal(expression.Value("aValue")).And(keyCondition)
//
// Expression Equivalent:
//
// expression.KeyBetween(expression.Key("foo"), expression.Value(5), expression.Value(10))
// // Let :five and :ten be ExpressionAttributeValues representing the
// // values 5 and 10 respectively
// "foo BETWEEN :five AND :ten"
func KeyBetween(keyBuilder KeyBuilder, lower, upper ValueBuilder) KeyConditionBuilder {
return KeyConditionBuilder{
operandList: []OperandBuilder{keyBuilder, lower, upper},
mode: betweenKeyCond,
}
}
// Between returns a KeyConditionBuilder representing the result of the
// BETWEEN function in DynamoDB Key Condition Expressions. The resulting
// KeyConditionBuilder can be used as a part of other Key Condition Expressions.
//
// Example:
//
// // keyCondition represents the boolean key condition of whether the value
// // of the key "foo" is between values 5 and 10
// keyCondition := expression.Key("foo").Between(expression.Value(5), expression.Value(10))
//
// // Used in another Key Condition Expression
// anotherKeyCondition := expression.Key("partitionKey").Equal(expression.Value("aValue")).And(keyCondition)
//
// Expression Equivalent:
//
// expression.Key("foo").Between(expression.Value(5), expression.Value(10))
// // Let :five and :ten be ExpressionAttributeValues representing the
// // values 5 and 10 respectively
// "foo BETWEEN :five AND :ten"
func (kb KeyBuilder) Between(lower, upper ValueBuilder) KeyConditionBuilder {
return KeyBetween(kb, lower, upper)
}
// KeyBeginsWith returns a KeyConditionBuilder representing the result of
// the begins_with function in DynamoDB Key Condition Expressions. The resulting
// KeyConditionBuilder can be used as a part of other Key Condition Expressions.
//
// Example:
//
// // keyCondition represents the boolean key condition of whether the value
// // of the key "foo" is begins with the prefix "bar"
// keyCondition := expression.KeyBeginsWith(expression.Key("foo"), "bar")
//
// // Used in another Key Condition Expression
// anotherKeyCondition := expression.Key("partitionKey").Equal(expression.Value("aValue")).And(keyCondition)
//
// Expression Equivalent:
//
// expression.KeyBeginsWith(expression.Key("foo"), "bar")
// // Let :bar be an ExpressionAttributeValue representing the value "bar"
// "begins_with(foo, :bar)"
func KeyBeginsWith(keyBuilder KeyBuilder, prefix string) KeyConditionBuilder {
valueBuilder := ValueBuilder{
value: prefix,
}
return KeyConditionBuilder{
operandList: []OperandBuilder{keyBuilder, valueBuilder},
mode: beginsWithKeyCond,
}
}
// BeginsWith returns a KeyConditionBuilder representing the result of the
// begins_with function in DynamoDB Key Condition Expressions. The resulting
// KeyConditionBuilder can be used as a part of other Key Condition Expressions.
//
// Example:
//
// // keyCondition represents the boolean key condition of whether the value
// // of the key "foo" is begins with the prefix "bar"
// keyCondition := expression.Key("foo").BeginsWith("bar")
//
// // Used in another Key Condition Expression
// anotherKeyCondition := expression.Key("partitionKey").Equal(expression.Value("aValue")).And(keyCondition)
//
// Expression Equivalent:
//
// expression.Key("foo").BeginsWith("bar")
// // Let :bar be an ExpressionAttributeValue representing the value "bar"
// "begins_with(foo, :bar)"
func (kb KeyBuilder) BeginsWith(prefix string) KeyConditionBuilder {
return KeyBeginsWith(kb, prefix)
}
// buildTree builds a tree structure of exprNodes based on the tree
// structure of the input KeyConditionBuilder's child KeyConditions/Operands.
// buildTree() satisfies the treeBuilder interface so KeyConditionBuilder can be
// a part of Expression struct.
func (kcb KeyConditionBuilder) buildTree() (exprNode, error) {
childNodes, err := kcb.buildChildNodes()
if err != nil {
return exprNode{}, err
}
ret := exprNode{
children: childNodes,
}
switch kcb.mode {
case equalKeyCond, lessThanKeyCond, lessThanEqualKeyCond, greaterThanKeyCond, greaterThanEqualKeyCond:
return compareBuildKeyCondition(kcb.mode, ret)
case andKeyCond:
return andBuildKeyCondition(kcb, ret)
case betweenKeyCond:
return betweenBuildKeyCondition(ret)
case beginsWithKeyCond:
return beginsWithBuildKeyCondition(ret)
case unsetKeyCond:
return exprNode{}, newUnsetParameterError("buildTree", "KeyConditionBuilder")
case invalidKeyCond:
return exprNode{}, fmt.Errorf("buildKeyCondition error: invalid key condition constructed")
default:
return exprNode{}, fmt.Errorf("buildKeyCondition error: unsupported mode: %v", kcb.mode)
}
}
// compareBuildKeyCondition is the function to make exprNodes from Compare
// KeyConditionBuilders. compareBuildKeyCondition is only called by the
// buildKeyCondition method. This function assumes that the argument
// KeyConditionBuilder has the right format.
func compareBuildKeyCondition(keyConditionMode keyConditionMode, node exprNode) (exprNode, error) {
// Create a string with special characters that can be substituted later: $c
switch keyConditionMode {
case equalKeyCond:
node.fmtExpr = "$c = $c"
case lessThanKeyCond:
node.fmtExpr = "$c < $c"
case lessThanEqualKeyCond:
node.fmtExpr = "$c <= $c"
case greaterThanKeyCond:
node.fmtExpr = "$c > $c"
case greaterThanEqualKeyCond:
node.fmtExpr = "$c >= $c"
default:
return exprNode{}, fmt.Errorf("build compare key condition error: unsupported mode: %v", keyConditionMode)
}
return node, nil
}
// andBuildKeyCondition is the function to make exprNodes from And
// KeyConditionBuilders. andBuildKeyCondition is only called by the
// buildKeyCondition method. This function assumes that the argument
// KeyConditionBuilder has the right format.
func andBuildKeyCondition(keyConditionBuilder KeyConditionBuilder, node exprNode) (exprNode, error) {
if len(keyConditionBuilder.keyConditionList) == 0 && len(keyConditionBuilder.operandList) == 0 {
return exprNode{}, newInvalidParameterError("andBuildKeyCondition", "KeyConditionBuilder")
}
// create a string with escaped characters to substitute them with proper
// aliases during runtime
node.fmtExpr = "($c) AND ($c)"
return node, nil
}
// betweenBuildKeyCondition is the function to make exprNodes from Between
// KeyConditionBuilders. betweenBuildKeyCondition is only called by the
// buildKeyCondition method. This function assumes that the argument
// KeyConditionBuilder has the right format.
func betweenBuildKeyCondition(node exprNode) (exprNode, error) {
// Create a string with special characters that can be substituted later: $c
node.fmtExpr = "$c BETWEEN $c AND $c"
return node, nil
}
// beginsWithBuildKeyCondition is the function to make exprNodes from
// BeginsWith KeyConditionBuilders. beginsWithBuildKeyCondition is only
// called by the buildKeyCondition method. This function assumes that the argument
// KeyConditionBuilder has the right format.
func beginsWithBuildKeyCondition(node exprNode) (exprNode, error) {
// Create a string with special characters that can be substituted later: $c
node.fmtExpr = "begins_with ($c, $c)"
return node, nil
}
// buildChildNodes creates the list of the child exprNodes. This avoids
// duplication of code amongst the various buildConditions.
func (kcb KeyConditionBuilder) buildChildNodes() ([]exprNode, error) {
childNodes := make([]exprNode, 0, len(kcb.keyConditionList)+len(kcb.operandList))
for _, keyCondition := range kcb.keyConditionList {
node, err := keyCondition.buildTree()
if err != nil {
return []exprNode{}, err
}
childNodes = append(childNodes, node)
}
for _, operand := range kcb.operandList {
ope, err := operand.BuildOperand()
if err != nil {
return []exprNode{}, err
}
childNodes = append(childNodes, ope.exprNode)
}
return childNodes, nil
}