ml
35 lines
912 B
Go
35 lines
912 B
Go
package resource
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// Filter filters for language and id to produce a list of matching resources.
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type Filter interface {
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Filter(lang Language, id ID) List
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}
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// Selector provides a merged view of resources according to a language.
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type Selector struct {
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// Lang specifies the language to filter by.
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Lang Language
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// From specifies from where the resources shall be taken.
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From Filter
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// As defines how the found resources should be viewed in case more than one matches.
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// By default, the last resource will be used.
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As ViewStrategy
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}
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// Select provides a collected view on one resource.
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func (merger Selector) Select(id ID) (view View, err error) {
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list := merger.From.Filter(merger.Lang, id)
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if len(list) == 0 {
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return nil, ErrNotFound(id)
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}
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if (merger.As == nil) || !merger.As.IsCompoundList(id) {
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view = list[len(list)-1]
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} else {
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view = &listMerger{list: list}
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}
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return view, nil
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}
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