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24 lines
1.0 KiB
Scala
24 lines
1.0 KiB
Scala
package com.twitter.product_mixer.component_library.premarshaller.urt.builder
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import com.twitter.product_mixer.core.model.marshalling.response.urt.PinEntryTimelineInstruction
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import com.twitter.product_mixer.core.model.marshalling.response.urt.TimelineEntry
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import com.twitter.product_mixer.core.pipeline.PipelineQuery
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import com.twitter.product_mixer.core.model.marshalling.response.urt.metadata.PinnableEntry
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case class PinEntryInstructionBuilder()
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extends UrtInstructionBuilder[PipelineQuery, PinEntryTimelineInstruction] {
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override def build(
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query: PipelineQuery,
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entries: Seq[TimelineEntry]
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): Seq[PinEntryTimelineInstruction] = {
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// Only one entry can be pinned and the desirable behavior is to pick the entry with the highest
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// sort index in the event that multiple pinned items exist. Since the entries are already
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// sorted we can accomplish this by picking the first one.
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entries.collectFirst {
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case entry: PinnableEntry if entry.isPinned.getOrElse(false) =>
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PinEntryTimelineInstruction(entry)
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}.toSeq
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}
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}
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