ml
59 lines
1.7 KiB
Go
59 lines
1.7 KiB
Go
package text
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import (
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"github.com/inkyblackness/hacked/ss1/resource"
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)
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// ElectronicMessageCache retrieves messages from a localizer and keeps them decoded until they are invalidated.
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type ElectronicMessageCache struct {
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cp Codepage
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localizer resource.Localizer
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messages map[resource.Key]ElectronicMessage
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}
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// NewElectronicMessageCache returns a new instance.
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func NewElectronicMessageCache(cp Codepage, localizer resource.Localizer) *ElectronicMessageCache {
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cache := &ElectronicMessageCache{
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cp: cp,
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localizer: localizer,
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messages: make(map[resource.Key]ElectronicMessage),
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}
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return cache
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}
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// InvalidateResources lets the cache remove any texts from resources that are specified in the given slice.
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func (cache *ElectronicMessageCache) InvalidateResources(ids []resource.ID) {
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for _, id := range ids {
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for key := range cache.messages {
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if key.ID == id {
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delete(cache.messages, key)
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}
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}
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}
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}
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// Message retrieves and caches the message of given key.
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func (cache *ElectronicMessageCache) Message(key resource.Key) (ElectronicMessage, error) {
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cacheKey := resource.KeyOf(key.ID.Plus(key.Index), key.Lang, 0)
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value, existing := cache.messages[cacheKey]
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if existing {
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return value, nil
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}
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selector := cache.localizer.LocalizedResources(key.Lang)
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view, err := selector.Select(cacheKey.ID)
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if err != nil {
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return EmptyElectronicMessage(), err
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}
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if (view.ContentType() != resource.Text) || !view.Compound() {
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return EmptyElectronicMessage(), resource.ErrWrongType(key, resource.Text)
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}
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value, err = DecodeElectronicMessage(cache.cp, view)
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if err != nil {
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return EmptyElectronicMessage(), err
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}
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cache.messages[cacheKey] = value
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return value, nil
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}
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