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| 1 | +package lucene |
| 2 | + |
| 3 | +import ( |
| 4 | + "fmt" |
| 5 | + "strings" |
| 6 | + |
| 7 | + "github.com/aws/aws-sdk-go-v2/service/dynamodb/types" |
| 8 | + "github.com/grindlemire/go-lucene/pkg/driver" |
| 9 | + "github.com/grindlemire/go-lucene/pkg/lucene/expr" |
| 10 | +) |
| 11 | + |
| 12 | +// DynamoDBPartiQLDriver converts Lucene queries to DynamoDB PartiQL. |
| 13 | +type DynamoDBPartiQLDriver struct { |
| 14 | + driver.Base |
| 15 | + fields map[string]FieldInfo |
| 16 | +} |
| 17 | + |
| 18 | +func NewDynamoDBDriver(fields []FieldInfo) *DynamoDBPartiQLDriver { |
| 19 | + fieldMap := make(map[string]FieldInfo) |
| 20 | + for _, f := range fields { |
| 21 | + fieldMap[f.Name] = f |
| 22 | + } |
| 23 | + |
| 24 | + fns := map[expr.Operator]driver.RenderFN{ |
| 25 | + expr.Literal: driver.Shared[expr.Literal], |
| 26 | + expr.And: driver.Shared[expr.And], |
| 27 | + expr.Or: driver.Shared[expr.Or], |
| 28 | + expr.Not: driver.Shared[expr.Not], |
| 29 | + expr.Equals: driver.Shared[expr.Equals], |
| 30 | + expr.Range: driver.Shared[expr.Range], |
| 31 | + expr.Must: driver.Shared[expr.Must], |
| 32 | + expr.MustNot: driver.Shared[expr.MustNot], |
| 33 | + expr.Wild: driver.Shared[expr.Wild], |
| 34 | + expr.Regexp: driver.Shared[expr.Regexp], |
| 35 | + expr.Like: dynamoDBLike, // Custom LIKE for DynamoDB functions |
| 36 | + expr.Greater: driver.Shared[expr.Greater], |
| 37 | + expr.GreaterEq: driver.Shared[expr.GreaterEq], |
| 38 | + expr.Less: driver.Shared[expr.Less], |
| 39 | + expr.LessEq: driver.Shared[expr.LessEq], |
| 40 | + expr.In: driver.Shared[expr.In], |
| 41 | + expr.List: driver.Shared[expr.List], |
| 42 | + } |
| 43 | + |
| 44 | + return &DynamoDBPartiQLDriver{ |
| 45 | + Base: driver.Base{ |
| 46 | + RenderFNs: fns, |
| 47 | + }, |
| 48 | + fields: fieldMap, |
| 49 | + } |
| 50 | +} |
| 51 | + |
| 52 | +// RenderPartiQL renders the expression to DynamoDB PartiQL with AttributeValue parameters. |
| 53 | +func (d *DynamoDBPartiQLDriver) RenderPartiQL(e *expr.Expression) (string, []types.AttributeValue, error) { |
| 54 | + // Use base rendering with ? placeholders |
| 55 | + str, params, err := d.RenderParam(e) |
| 56 | + if err != nil { |
| 57 | + return "", nil, err |
| 58 | + } |
| 59 | + |
| 60 | + // Convert params to DynamoDB AttributeValues |
| 61 | + attrValues := make([]types.AttributeValue, len(params)) |
| 62 | + for i, param := range params { |
| 63 | + attrValues[i] = &types.AttributeValueMemberS{Value: fmt.Sprintf("%v", param)} |
| 64 | + } |
| 65 | + |
| 66 | + return str, attrValues, nil |
| 67 | +} |
| 68 | + |
| 69 | +// dynamoDBLike implements LIKE using DynamoDB's begins_with and contains functions. |
| 70 | +func dynamoDBLike(left, right string) (string, error) { |
| 71 | + // Remove quotes from right side to analyze pattern |
| 72 | + pattern := strings.Trim(right, "'") |
| 73 | + |
| 74 | + // Replace wildcards for analysis |
| 75 | + hasPrefix := strings.HasPrefix(pattern, "%") |
| 76 | + hasSuffix := strings.HasSuffix(pattern, "%") |
| 77 | + |
| 78 | + if hasPrefix && hasSuffix { |
| 79 | + // %value% -> contains(field, value) |
| 80 | + value := strings.Trim(pattern, "%") |
| 81 | + return fmt.Sprintf("contains(%s, '%s')", left, value), nil |
| 82 | + } else if !hasPrefix && hasSuffix { |
| 83 | + // value% -> begins_with(field, value) |
| 84 | + value := strings.TrimSuffix(pattern, "%") |
| 85 | + return fmt.Sprintf("begins_with(%s, '%s')", left, value), nil |
| 86 | + } else if hasPrefix && !hasSuffix { |
| 87 | + // %value -> contains(field, value) (DynamoDB doesn't have ends_with) |
| 88 | + value := strings.TrimPrefix(pattern, "%") |
| 89 | + return fmt.Sprintf("contains(%s, '%s')", left, value), nil |
| 90 | + } |
| 91 | + |
| 92 | + // Exact match |
| 93 | + return fmt.Sprintf("%s = %s", left, right), nil |
| 94 | +} |
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