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package dynamodb
import (
"strconv"
)
const (
TYPE_STRING = "S"
TYPE_NUMBER = "N"
TYPE_BINARY = "B"
TYPE_STRING_SET = "SS"
TYPE_NUMBER_SET = "NS"
TYPE_BINARY_SET = "BS"
COMPARISON_EQUAL = "EQ"
COMPARISON_NOT_EQUAL = "NE"
COMPARISON_LESS_THAN_OR_EQUAL = "LE"
COMPARISON_LESS_THAN = "LT"
COMPARISON_GREATER_THAN_OR_EQUAL = "GE"
COMPARISON_GREATER_THAN = "GT"
COMPARISON_ATTRIBUTE_EXISTS = "NOT_NULL"
COMPARISON_ATTRIBUTE_DOES_NOT_EXIST = "NULL"
COMPARISON_CONTAINS = "CONTAINS"
COMPARISON_DOES_NOT_CONTAIN = "NOT_CONTAINS"
COMPARISON_BEGINS_WITH = "BEGINS_WITH"
COMPARISON_IN = "IN"
COMPARISON_BETWEEN = "BETWEEN"
)
type Key struct {
HashKey string
RangeKey string
}
type PrimaryKey struct {
KeyAttribute *Attribute
RangeAttribute *Attribute
}
type Attribute struct {
Type string
Name string
Value string
SetValues []string
Exists string // exists on dynamodb? Values: "true", "false", or ""
}
type AttributeComparison struct {
AttributeName string
ComparisonOperator string
AttributeValueList []Attribute // contains attributes with only types and names (value ignored)
}
func NewEqualInt64AttributeComparison(attributeName string, equalToValue int64) *AttributeComparison {
numeric := NewNumericAttribute(attributeName, strconv.FormatInt(equalToValue, 10))
return &AttributeComparison{attributeName,
COMPARISON_EQUAL,
[]Attribute{*numeric},
}
}
func NewEqualStringAttributeComparison(attributeName string, equalToValue string) *AttributeComparison {
str := NewStringAttribute(attributeName, equalToValue)
return &AttributeComparison{attributeName,
COMPARISON_EQUAL,
[]Attribute{*str},
}
}
func NewStringAttributeComparison(attributeName string, comparisonOperator string, value string) *AttributeComparison {
valueToCompare := NewStringAttribute(attributeName, value)
return &AttributeComparison{attributeName,
comparisonOperator,
[]Attribute{*valueToCompare},
}
}
func NewNumericAttributeComparison(attributeName string, comparisonOperator string, value int64) *AttributeComparison {
valueToCompare := NewNumericAttribute(attributeName, strconv.FormatInt(value, 10))
return &AttributeComparison{attributeName,
comparisonOperator,
[]Attribute{*valueToCompare},
}
}
func NewBinaryAttributeComparison(attributeName string, comparisonOperator string, value bool) *AttributeComparison {
valueToCompare := NewBinaryAttribute(attributeName, strconv.FormatBool(value))
return &AttributeComparison{attributeName,
comparisonOperator,
[]Attribute{*valueToCompare},
}
}
func NewStringAttribute(name string, value string) *Attribute {
return &Attribute{
Type: TYPE_STRING,
Name: name,
Value: value,
}
}
func NewNumericAttribute(name string, value string) *Attribute {
return &Attribute{
Type: TYPE_NUMBER,
Name: name,
Value: value,
}
}
func NewBinaryAttribute(name string, value string) *Attribute {
return &Attribute{
Type: TYPE_BINARY,
Name: name,
Value: value,
}
}
func NewStringSetAttribute(name string, values []string) *Attribute {
return &Attribute{
Type: TYPE_STRING_SET,
Name: name,
SetValues: values,
}
}
func NewNumericSetAttribute(name string, values []string) *Attribute {
return &Attribute{
Type: TYPE_NUMBER_SET,
Name: name,
SetValues: values,
}
}
func NewBinarySetAttribute(name string, values []string) *Attribute {
return &Attribute{
Type: TYPE_BINARY_SET,
Name: name,
SetValues: values,
}
}
func (a *Attribute) SetType() bool {
switch a.Type {
case TYPE_BINARY_SET, TYPE_NUMBER_SET, TYPE_STRING_SET:
return true
}
return false
}
func (a *Attribute) SetExists(exists bool) *Attribute {
if exists {
a.Exists = "true"
} else {
a.Exists = "false"
}
return a
}
func (k *PrimaryKey) HasRange() bool {
return k.RangeAttribute != nil
}
// Useful when you may have many goroutines using a primary key, so they don't fuxor up your values.
func (k *PrimaryKey) Clone(h string, r string) []Attribute {
pk := &Attribute{
Type: k.KeyAttribute.Type,
Name: k.KeyAttribute.Name,
Value: h,
}
result := []Attribute{*pk}
if k.HasRange() {
rk := &Attribute{
Type: k.RangeAttribute.Type,
Name: k.RangeAttribute.Name,
Value: r,
}
result = append(result, *rk)
}
return result
}
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