283 lines
8.7 KiB
Go
283 lines
8.7 KiB
Go
package activitystreams
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import (
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"github.com/buger/jsonparser"
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)
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var validCollectionTypes = [...]ActivityVocabularyType{
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CollectionType,
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OrderedCollectionType,
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CollectionPageType,
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OrderedCollectionPageType,
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}
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type CollectionInterface interface {
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ObjectOrLink
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Collection() CollectionInterface
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Append(ob Item) error
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}
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// Collection is a subtype of Activity Pub Object that represents ordered or unordered sets of Activity Pub Object or Link instances.
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type Collection struct {
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Parent
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// In a paged Collection, indicates the page that contains the most recently updated member items.
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Current ObjectOrLink `jsonld:"current,omitempty"`
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// In a paged Collection, indicates the furthest preceeding page of items in the collection.
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First ObjectOrLink `jsonld:"first,omitempty"`
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// In a paged Collection, indicates the furthest proceeding page of the collection.
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Last ObjectOrLink `jsonld:"last,omitempty"`
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// A non-negative integer specifying the total number of objects contained by the logical view of the collection.
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// This number might not reflect the actual number of items serialized within the Collection object instance.
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TotalItems uint `jsonld:"totalItems,omitempty"`
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// Identifies the items contained in a collection. The items might be ordered or unordered.
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Items ItemCollection `jsonld:"items,omitempty"`
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}
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// OrderedCollection is a subtype of Collection in which members of the logical
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// collection are assumed to always be strictly ordered.
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type OrderedCollection struct {
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Parent
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// In a paged Collection, indicates the page that contains the most recently updated member items.
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Current ObjectOrLink `jsonld:"current,omitempty"`
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// In a paged Collection, indicates the furthest preceeding page of items in the collection.
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First ObjectOrLink `jsonld:"first,omitempty"`
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// In a paged Collection, indicates the furthest proceeding page of the collection.
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Last ObjectOrLink `jsonld:"last,omitempty"`
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// A non-negative integer specifying the total number of objects contained by the logical view of the collection.
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// This number might not reflect the actual number of items serialized within the Collection object instance.
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TotalItems uint `jsonld:"totalItems,omitempty"`
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// Identifies the items contained in a collection. The items might be ordered or unordered.
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OrderedItems ItemCollection `jsonld:"orderedItems,omitempty"`
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}
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// CollectionPage is a Collection that contains a large number of items and when it becomes impractical
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// for an implementation to serialize every item contained by a Collection using the items (or orderedItems)
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// property alone. In such cases, the items within a Collection can be divided into distinct subsets or "pages".
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type CollectionPage struct {
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Collection
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// Identifies the Collection to which a CollectionPage objects items belong.
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PartOf Item `jsonld:"partOf,omitempty"`
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// In a paged Collection, indicates the next page of items.
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Next Item `jsonld:"next,omitempty"`
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// In a paged Collection, identifies the previous page of items.
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Prev Item `jsonld:"prev,omitempty"`
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}
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// OrderedCollectionPage type extends from both CollectionPage and OrderedCollection.
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// In addition to the properties inherited from each of those, the OrderedCollectionPage
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// may contain an additional startIndex property whose value indicates the relative index position
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// of the first item contained by the page within the OrderedCollection to which the page belongs.
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type OrderedCollectionPage struct {
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OrderedCollection
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// Identifies the Collection to which a CollectionPage objects items belong.
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PartOf Item `jsonld:"partOf,omitempty"`
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// In a paged Collection, indicates the next page of items.
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Next Item `jsonld:"next,omitempty"`
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// In a paged Collection, identifies the previous page of items.
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Prev Item `jsonld:"prev,omitempty"`
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// A non-negative integer value identifying the relative position within the logical view of a strictly ordered collection.
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StartIndex uint `jsonld:"startIndex,omitempty"`
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}
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// ValidCollectionType validates against the valid collection types
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func ValidCollectionType(typ ActivityVocabularyType) bool {
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for _, v := range validCollectionTypes {
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if v == typ {
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return true
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}
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}
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return false
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}
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// CollectionNew initializes a new Collection
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func CollectionNew(id ObjectID) *Collection {
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c := Collection{Parent: Parent{ID: id, Type: CollectionType}}
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c.Name = NaturalLanguageValueNew()
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c.Content = NaturalLanguageValueNew()
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c.Summary = NaturalLanguageValueNew()
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return &c
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}
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// OrderedCollectionNew initializes a new OrderedCollection
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func OrderedCollectionNew(id ObjectID) *OrderedCollection {
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o := OrderedCollection{Parent: Parent{ID: id, Type: OrderedCollectionType}}
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o.Name = NaturalLanguageValueNew()
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o.Content = NaturalLanguageValueNew()
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return &o
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}
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// CollectionNew initializes a new CollectionPage
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func CollectionPageNew(parent CollectionInterface) *CollectionPage {
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p := CollectionPage{
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PartOf: parent.GetLink(),
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}
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if pc, ok := parent.(*Collection); ok {
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p.Collection = *pc
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}
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p.Type = CollectionPageType
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return &p
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}
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// OrderedCollectionPageNew initializes a new OrderedCollectionPage
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func OrderedCollectionPageNew(parent CollectionInterface) *OrderedCollectionPage {
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p := OrderedCollectionPage{
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PartOf: parent.GetLink(),
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}
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if pc, ok := parent.(*OrderedCollection); ok {
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p.OrderedCollection = *pc
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}
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p.Type = OrderedCollectionPageType
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return &p
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}
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// Append adds an element to an OrderedCollection
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func (o *OrderedCollection) Append(ob Item) error {
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o.OrderedItems = append(o.OrderedItems, ob)
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o.TotalItems++
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return nil
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}
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// Append adds an element to a Collection
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func (c *Collection) Append(ob Item) error {
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c.Items = append(c.Items, ob)
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c.TotalItems++
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return nil
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}
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// Append adds an element to an OrderedCollectionPage
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func (o *OrderedCollectionPage) Append(ob Item) error {
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o.OrderedItems = append(o.OrderedItems, ob)
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o.TotalItems++
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return nil
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}
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// Append adds an element to a CollectionPage
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func (c *CollectionPage) Append(ob Item) error {
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c.Items = append(c.Items, ob)
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c.TotalItems++
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return nil
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}
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// GetType returns the Collection's type
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func (c Collection) GetType() ActivityVocabularyType {
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return c.Type
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}
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// IsLink returns false for a Collection object
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func (c Collection) IsLink() bool {
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return false
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}
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// GetID returns the ObjectID corresponding to the Collection object
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func (c Collection) GetID() *ObjectID {
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return &c.ID
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}
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// GetLink returns the IRI corresponding to the Collection object
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func (c Collection) GetLink() IRI {
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return IRI(c.ID)
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}
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// IsObject returns true for a Collection object
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func (c Collection) IsObject() bool {
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return true
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}
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// GetType returns the OrderedCollection's type
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func (o OrderedCollection) GetType() ActivityVocabularyType {
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return o.Type
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}
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// IsLink returns false for an OrderedCollection object
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func (o OrderedCollection) IsLink() bool {
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return false
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}
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// GetID returns the ObjectID corresponding to the OrderedCollection
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func (o OrderedCollection) GetID() *ObjectID {
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return &o.ID
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}
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// GetLink returns the IRI corresponding to the OrderedCollection object
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func (o OrderedCollection) GetLink() IRI {
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return IRI(o.ID)
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}
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// IsObject returns true for am OrderedCollection object
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func (o OrderedCollection) IsObject() bool {
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return true
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}
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// UnmarshalJSON
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func (o *OrderedCollection) UnmarshalJSON(data []byte) error {
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o.Parent.UnmarshalJSON(data)
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o.TotalItems = uint(getAPInt(data, "totalItems"))
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o.OrderedItems = getAPItems(data, "orderedItems")
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o.Current = getAPItem(data, "current")
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o.First = getAPItem(data, "first")
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o.Last = getAPItem(data, "last")
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return nil
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}
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// UnmarshalJSON
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func (c *Collection) UnmarshalJSON(data []byte) error {
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c.Parent.UnmarshalJSON(data)
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c.TotalItems = uint(getAPInt(data, "totalItems"))
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c.Items = getAPItems(data, "items")
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c.Current = getAPItem(data, "current")
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c.First = getAPItem(data, "first")
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c.Last = getAPItem(data, "last")
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return nil
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}
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// UnmarshalJSON
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func (o *OrderedCollectionPage) UnmarshalJSON(data []byte) error {
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o.OrderedCollection.UnmarshalJSON(data)
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o.Next = getAPItem(data, "next")
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o.Prev = getAPItem(data, "prev")
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o.PartOf = getAPItem(data, "partOf")
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if si, err := jsonparser.GetInt(data, "startIndex"); err != nil {
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o.StartIndex = uint(si)
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}
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return nil
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}
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// UnmarshalJSON
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func (c *CollectionPage) UnmarshalJSON(data []byte) error {
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c.Collection.UnmarshalJSON(data)
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c.Next = getAPItem(data, "next")
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c.Prev = getAPItem(data, "prev")
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c.PartOf = getAPItem(data, "partOf")
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return nil
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}
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/*
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func (c *Collection) MarshalJSON() ([]byte, error) {
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return nil, nil
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}
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func (o *OrderedCollection) MarshalJSON() ([]byte, error) {
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return nil, nil
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}
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*/
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// Collection returns the underlying Collection type
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func (c *Collection) Collection() CollectionInterface {
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return c
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}
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// Collection returns the underlying Collection type
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func (o *OrderedCollection) Collection() CollectionInterface {
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return o
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}
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