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filter.go
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filter.go
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package godf
import (
"fmt"
"reflect"
)
type Filter interface {
applyFilter(d *dataframe) *dataframe
}
// Eq filter rows where a data in the given column is equal to given value
//
// Example of usage:
// df.Where(Eq{"x": 5})
// will only get data with x = 5
type Eq map[string]interface{}
func (filter Eq) applyFilter(d *dataframe) *dataframe {
df := dataframe{}
df.headers = d.headers
df.data = make([][]interface{}, len(d.data))
for fHeader, fValue := range filter {
if reflect.TypeOf(fValue).Kind() == reflect.Int {
fValue = float64(fValue.(int))
}
for colIdx, dHeader := range d.headers {
if fHeader == dHeader {
for i, row := range d.data[colIdx] {
if row.(float64) == fValue.(float64) {
rowData := d.GetRow(i + 1)
for i, data := range rowData.data {
df.data[i] = append(df.data[i], data[0])
}
}
}
}
}
}
return &df
}
// NotEq filter rows where a data in the given column is not equal to given value
//
// Example of usage:
// df.Where(NotEq{"x": 5})
// will get all data except the data with x = 5
type NotEq map[string]interface{}
func (filter NotEq) applyFilter(d *dataframe) *dataframe {
df := dataframe{}
df.headers = d.headers
df.data = make([][]interface{}, len(d.data))
for fHeader, fValue := range filter {
if reflect.TypeOf(fValue).Kind() == reflect.Int {
fValue = float64(fValue.(int))
}
for colIdx, dHeader := range d.headers {
if fHeader == dHeader {
for i, row := range d.data[colIdx] {
if row.(float64) != fValue.(float64) {
rowData := d.GetRow(i + 1)
for i, data := range rowData.data {
df.data[i] = append(df.data[i], data[0])
}
}
}
}
}
}
return &df
}
// GT filter rows where a data in the given column is greater than the given value
//
// Example of usage:
// df.Where(GT{"x": 5})
// will only get data with x > 5
type GT map[string]interface{}
func (filter GT) applyFilter(d *dataframe) *dataframe {
df := dataframe{}
df.headers = d.headers
df.data = make([][]interface{}, len(d.data))
for fHeader, fValue := range filter {
if reflect.TypeOf(fValue).Kind() == reflect.Int {
fValue = float64(fValue.(int))
}
for colIdx, dHeader := range d.headers {
if fHeader == dHeader {
for i, row := range d.data[colIdx] {
if row.(float64) > fValue.(float64) {
rowData := d.GetRow(i + 1)
for i, data := range rowData.data {
df.data[i] = append(df.data[i], data[0])
}
}
}
}
}
}
return &df
}
// GTE filter rows where a data in the given column is greater than or equal to the given value
//
// Example of usage:
// df.Where(GTE{"x": 5})
// will only get data with x >= 5
type GTE map[string]interface{}
func (filter GTE) applyFilter(d *dataframe) *dataframe {
df := dataframe{}
df.headers = d.headers
df.data = make([][]interface{}, len(d.data))
for fHeader, fValue := range filter {
if reflect.TypeOf(fValue).Kind() == reflect.Int {
fValue = float64(fValue.(int))
}
for colIdx, dHeader := range d.headers {
if fHeader == dHeader {
for i, row := range d.data[colIdx] {
if row.(float64) >= fValue.(float64) {
rowData := d.GetRow(i + 1)
for i, data := range rowData.data {
df.data[i] = append(df.data[i], data[0])
}
}
}
}
}
}
return &df
}
// LT filter rows where a data in the given column is less than the given value
//
// Example of usage:
// df.Where(LT{"x": 5})
// will only get data with x < 5
type LT map[string]interface{}
func (filter LT) applyFilter(d *dataframe) *dataframe {
df := dataframe{}
df.headers = d.headers
df.data = make([][]interface{}, len(d.data))
for fHeader, fValue := range filter {
if reflect.TypeOf(fValue).Kind() == reflect.Int {
fValue = float64(fValue.(int))
}
for colIdx, dHeader := range d.headers {
if fHeader == dHeader {
for i, row := range d.data[colIdx] {
if row.(float64) < fValue.(float64) {
rowData := d.GetRow(i + 1)
for i, data := range rowData.data {
df.data[i] = append(df.data[i], data[0])
}
}
}
}
}
}
return &df
}
// LTE filter rows where a data in the given column is less than or equal to the given value
//
// Example of usage:
// df.Where(LTE{"x": 5})
// will only get data with x <= 5
type LTE map[string]interface{}
func (filter LTE) applyFilter(d *dataframe) *dataframe {
df := dataframe{}
df.headers = d.headers
df.data = make([][]interface{}, len(d.data))
for fHeader, fValue := range filter {
if reflect.TypeOf(fValue).Kind() == reflect.Int {
fValue = float64(fValue.(int))
}
for colIdx, dHeader := range d.headers {
if fHeader == dHeader {
for i, row := range d.data[colIdx] {
if row.(float64) <= fValue.(float64) {
rowData := d.GetRow(i + 1)
for i, data := range rowData.data {
df.data[i] = append(df.data[i], data[0])
}
}
}
}
}
}
return &df
}
// In filter all data which value is in the given slice
//
// Example of usage:
// df.Where(In{"x": []int{1, 2, 3, 4}})
// will only get data with x = [1, 2, 3, 4]
type In map[string]interface{}
func (filter In) applyFilter(d *dataframe) *dataframe {
df := dataframe{}
df.headers = d.headers
df.data = make([][]interface{}, len(d.data))
for fHeader, fValue := range filter {
if reflect.TypeOf(fValue).Kind() != reflect.Slice {
fmt.Println("In only support slice")
return nil
}
for colIdx, dHeader := range d.headers {
if fHeader == dHeader {
for i, row := range d.data[colIdx] {
if inArray(row, fValue) {
rowData := d.GetRow(i + 1)
for i, data := range rowData.data {
df.data[i] = append(df.data[i], data[0])
}
}
}
}
}
}
return &df
}
func inArray(value interface{}, array interface{}) bool {
s := reflect.ValueOf(array)
for i := 0; i < s.Len(); i++ {
var fData float64
data := s.Index(i).Interface()
if reflect.TypeOf(data).Kind() == reflect.Int {
fData = float64(data.(int))
} else if reflect.TypeOf(data).Kind() == reflect.Float64 {
fData = data.(float64)
} else {
panic("Currently In only supports int and float64")
}
if reflect.DeepEqual(value, fData) {
return true
}
}
return false
}
func inArrayString(needle string, haystack []string) bool {
for _, h := range haystack {
if needle == h {
return true
}
}
return false
}
// Where
//
// Filter rows with given filter
//
// Example of usage:
// df.Where(GT{"x": 5})
// will only get data with x > 5
func (d *dataframe) Where(filter Filter) *dataframe {
if filter == nil {
return nil
}
return filter.applyFilter(d)
}