Attribute Manager has been added.

context/attributes.go

@@ -0,0 +1,68 @@
+package context
+
+type AttributeManager interface {
+	Init()
+	SetAttribute(key string, value interface{})
+	GetAttribute(key string) (value interface{})
+	GetAttributeNames() []string
+	RemoveAttribute(key string)
+	Contains(key string) (exist bool)
+	Destroy()
+}
+
+type AttributeManagers struct {
+	attributes map[string]interface{}
+}
+
+func (am *AttributeManagers) Init() {
+	if nil == am.attributes {
+		am.attributes = make(map[string]interface{})
+	}
+}
+
+func (am *AttributeManagers) SetAttribute(key string, value interface{}) {
+	if nil == am.attributes {
+		am.attributes = make(map[string]interface{})
+	}
+	am.attributes[key] = value
+}
+
+func (am *AttributeManagers) GetAttribute(key string) (value interface{}) {
+	if nil == am.attributes {
+		return nil
+	}
+	return am.attributes[key]
+}
+
+func (am *AttributeManagers) GetAttributeNames() []string {
+	if nil == am.attributes {
+		return nil
+	}
+	keys := []string{}
+	for k, _ := range am.attributes {
+		keys = append(keys, k)
+	}
+
+	return keys
+}
+
+func (am *AttributeManagers) RemoveAttribute(key string) {
+	if nil == am.attributes {
+		return
+	}
+	delete(am.attributes, key)
+}
+
+func (am *AttributeManagers) Contains(key string) (exist bool) {
+	if nil == am.attributes {
+		return false
+	}
+	_, ok := am.attributes[key]
+	return ok
+}
+
+func (am *AttributeManagers) Destroy() {
+	if nil == am.attributes {
+		am.attributes = nil
+	}
+}