1 files changed, 57 insertions, 0 deletions
diff --git a/sdc-workflow-designer-ui/src/app/paletx/core/select.service.ts b/sdc-workflow-designer-ui/src/app/paletx/core/select.service.ts
new file mode 100644
index 00000000..ba6f579e
--- /dev/null
+++ b/sdc-workflow-designer-ui/src/app/paletx/core/select.service.ts
@@ -0,0 +1,57 @@
+/* tslint:disable:array-type member-access variable-name */
+import {Injectable} from '@angular/core';
+
+@Injectable()
+export class SelectService {
+  selection: string[] = [];
+
+  selected(indexName: string): boolean {
+	if (this.selection === undefined || this.selection === []) {
+		return null;
+	}
+
+	for (let item of this.selection) {
+		if (item === indexName) {
+		return true;
+		}
+	}
+	return false;
+  }
+
+  handleSingleSelect(optionIndex: string) {
+	this.selection = [];
+	this.selection.push(optionIndex);
+	return this.selection;
+  }
+
+  handleMutipleSelect(optionIndex: string) {
+	if (this.selected(optionIndex)) {
+		this.selection = this.handleSecondSelect(optionIndex);
+	} else {
+		this.selection.push(optionIndex);
+	}
+	return this.selection;
+  }
+
+  handleSecondSelect(optionIndex: string) {
+	let selectedOption = [];
+	for (let option of this.selection) {
+		if (option !== optionIndex) {
+		selectedOption.push(option);
+		}
+	}
+	return selectedOption;
+  }
+
+  select(optionIndex: string, isMutiple: boolean): string[] {
+	if (!isMutiple) {
+		return this.handleSingleSelect(optionIndex);
+	} else {
+		return this.handleMutipleSelect(optionIndex);
+	}
+  }
+
+  deselect() {
+	this.selection = [];
+  }
+}