public async findConflictRange()

in src/DiagnosticProvider.ts [77:100]
22 lines of code
10 McCabe index (conditional complexity)

    public async findConflictRange(filePath: string, gid: string, aid: string): Promise<vscode.Range> {
        const pomDocument = await vscode.window.showTextDocument(vscode.Uri.file(filePath), {preserveFocus: true});
        const projectNodes: ElementNode[] = getNodesByTag(pomDocument.document.getText(), XmlTagName.Project);
        if (projectNodes === undefined || projectNodes.length !== 1) {
            throw new UserError("Only support POM file with single <project> node.");
        }

        const projectNode: ElementNode = projectNodes[0];
        const dependenciesNode: ElementNode | undefined = projectNode.children?.find(node => node.tag === XmlTagName.Dependencies);
        const dependencyNode =  dependenciesNode?.children?.find(node =>
            node.children?.find(id => id.tag === XmlTagName.GroupId && id.text === gid) !== undefined &&
            node.children?.find(id => id.tag === XmlTagName.ArtifactId && id.text === aid) !== undefined
        );
        if (dependencyNode === undefined) {
            throw new UserError("Failed to find dependency.");
        }

        const aidItem: ElementNode | undefined = dependencyNode.children?.find(node => node.tag === XmlTagName.ArtifactId);
        if (aidItem === undefined || aidItem.contentStart === undefined || aidItem.contentEnd === undefined) {
            throw new UserError("Failed to find dependency.");
        }
        const currentDocument: vscode.TextDocument = await vscode.workspace.openTextDocument(filePath);
        return new vscode.Range(currentDocument.positionAt(aidItem.contentStart), currentDocument.positionAt(aidItem.contentEnd));
    }