public void setTrigger(ExecutionTrigger trigger) {
        this.trigger = trigger;
    }
<p>
The interaction or event that started a pipeline execution, such as automated change detection or a
<code>StartPipelineExecution</code> API call.
</p>

@param trigger
       The interaction or event that started a pipeline execution, such as automated change detection or a
       <code>StartPipelineExecution</code> API call.
aws-java-sdk-codepipeline/src/main/java/com/amazonaws/services/codepipeline/model/PipelineExecutionSummary.java