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filter.go
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filter.go
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package graph
import (
"fmt"
"strings"
)
type FilterFn func(*Resource) bool
func (g *Graph) Filter(entity string, filters ...FilterFn) (*Graph, error) {
return g.filter(applyAnd, entity, filters...)
}
func (g *Graph) OrFilter(entity string, filters ...FilterFn) (*Graph, error) {
return g.filter(applyOr, entity, filters...)
}
func (g *Graph) filter(apply func(filters ...FilterFn) FilterFn, entity string, filters ...FilterFn) (*Graph, error) {
filtered := NewGraph()
all, err := g.GetAllResources(entity)
if err != nil {
return filtered, err
}
for _, r := range all {
if apply(filters...)(r) {
filtered.AddResource(r)
}
}
return filtered, nil
}
func BuildPropertyFilterFunc(key, val string) FilterFn {
return func(r *Resource) bool {
return strings.Contains(strings.ToLower(fmt.Sprint(r.properties[key])), strings.ToLower(val))
}
}
func BuildTagFilterFunc(key, val string) FilterFn {
return func(r *Resource) bool {
tags, ok := r.properties["Tags"].([]string)
if !ok {
return false
}
for _, t := range tags {
if fmt.Sprintf("%s=%s", key, val) == t {
return true
}
}
return false
}
}
func BuildTagKeyFilterFunc(key string) FilterFn {
return func(r *Resource) bool {
tags, ok := r.properties["Tags"].([]string)
if !ok {
return false
}
for _, t := range tags {
splits := strings.Split(t, "=")
if len(splits) > 0 {
if splits[0] == key {
return true
}
}
}
return false
}
}
func BuildTagValueFilterFunc(value string) FilterFn {
return func(r *Resource) bool {
tags, ok := r.properties["Tags"].([]string)
if !ok {
return false
}
for _, t := range tags {
splits := strings.Split(t, "=")
if len(splits) > 1 {
if splits[1] == value {
return true
}
}
}
return false
}
}
func applyAnd(filters ...FilterFn) FilterFn {
return func(r *Resource) bool {
include := true
for _, f := range filters {
include = include && f(r)
}
return include
}
}
func applyOr(filters ...FilterFn) FilterFn {
return func(r *Resource) bool {
if len(filters) == 0 {
return true
}
for _, f := range filters {
if f(r) {
return true
}
}
return false
}
}