unique-entry.pipe.ts
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	import { Pipe, PipeTransform } from '@angular/core';
	import { DataMapping, Link, QueryDataMapping } from './models';

	@Pipe({
	name: 'uniqueEntry'
	})
	export class UniqueEntryPipe implements PipeTransform {
	transform(dataMapping: DataMapping): DataMapping {
	let queryDataMappings: QueryDataMapping[] = [];
	let keys = new Set(dataMapping.queryDataMappings.map(queryDataMapping =>queryDataMapping.variable))
	keys.forEach(key =>{
	let items = dataMapping.queryDataMappings.filter(queryDataMapping =>queryDataMapping.variable == key)
	if (items.length == 1 \|\| items[0].links.length == 0){
	queryDataMappings.push(items[0])
	} else {
	let newItem = items[0];
	for (var i = 1; i < items.length; i++){
	if (newItem.links.filter(link =>link.value == items[i].links[0].value).length == 0){
	newItem.links.push(items[i].links[0])
	}
	}
	queryDataMappings.push(newItem);
	}
	})
	dataMapping.queryDataMappings = queryDataMappings;
	return dataMapping;
	}

	}