/
entity.go
121 lines (100 loc) · 3.07 KB
/
entity.go
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/*
* Copyright (c) 2020 Juan Medina.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package goecs
import (
"fmt"
"reflect"
)
var (
lastID = int64(0)
)
// Entity represents a instance of an object in a ECS
type Entity struct {
id int64
components map[reflect.Type]interface{}
}
// ID : get the unique id for this Entity
func (ent Entity) ID() int64 {
return ent.id
}
// String : get a string representation of an Entity
func (ent Entity) String() string {
var result = fmt.Sprintf("id{%d}", ent.id)
for _, v := range ent.components {
if result != "" {
result += ","
}
result += fmt.Sprintf("%s%v", reflect.TypeOf(v).String(), v)
}
return "Entity{" + result + "}"
}
// NewEntity creates a new Entity giving a set of varg components
func NewEntity(components ...interface{}) *Entity {
ent := Entity{
id: lastID,
components: make(map[reflect.Type]interface{}),
}
for _, v := range components {
ent.Add(v)
}
lastID++
return &ent
}
// Add a new component into an Entity
func (ent *Entity) Add(component interface{}) *Entity {
ent.components[reflect.TypeOf(component)] = component
return ent
}
// Set a new component into an Entity
func (ent *Entity) Set(component interface{}) *Entity {
return ent.Add(component)
}
// Get the component of the given reflect.Type
func (ent Entity) Get(rtype reflect.Type) interface{} {
return ent.components[rtype]
}
// Remove the component of the given reflect.Type
func (ent *Entity) Remove(typ reflect.Type) {
delete(ent.components, typ)
}
// Contains check that the Entity has the given varg reflect.Type
func (ent Entity) Contains(rtypes ...reflect.Type) bool {
var contains = true
for _, t := range rtypes {
if _, ok := ent.components[t]; !ok {
contains = false
break
}
}
return contains
}
// NotContains check that the Entity has not the given varg reflect.Type
func (ent Entity) NotContains(rtypes ...reflect.Type) bool {
var noContains = true
for _, t := range rtypes {
if _, ok := ent.components[t]; ok {
noContains = false
break
}
}
return noContains
}