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import { ContentPageTree, ContentPageTreeElement } from './content-page-tree.model';
export class ContentPageTreeHelper {
/**
* Create a new empty tree with no nodes.
*/
static empty(): ContentPageTree {
return {
edges: {},
nodes: {},
rootIds: [],
};
}
/**
* Create a new tree with a single node.
*/
static single(element: ContentPageTreeElement): ContentPageTree {
if (!element) {
throw new Error('falsy input');
}
if (!element.contentPageId) {
throw new Error('content tree element has no contentPageId');
}
// set element as root if it has just one element in its path
const rootIds = element.path && element.path.length === 1 ? [element.contentPageId] : [];
// add edges from elementPath
const edges: { [id: string]: string[] } = {};
if (element.path && element.path.length >= 2) {
const path = element.path;
for (let i = 0; i < path.length - 1; i++) {
edges[path[i]] = [path[i + 1]];
}
}
const nodes = { [element.contentPageId]: { ...element } };
return {
edges,
nodes,
rootIds,
};
}
/**
* Merge two trees to a new tree.
* Updates nodes according to updateStrategy.
*/
static merge(current: ContentPageTree, incoming: ContentPageTree): ContentPageTree {
if (!current || !incoming) {
throw new Error('falsy input');
}
return {
edges: ContentPageTreeHelper.mergeEdges(current.edges, incoming.edges),
nodes: ContentPageTreeHelper.mergeNodes(current.nodes, incoming.nodes),
rootIds: ContentPageTreeHelper.mergeRootIDs(current.rootIds, incoming.rootIds),
};
}
/**
* Helper method for adding a single element to a tree.
*/
static add(tree: ContentPageTree, element: ContentPageTreeElement): ContentPageTree {
const singleContentPageTree = ContentPageTreeHelper.single(element);
return ContentPageTreeHelper.merge(tree, singleContentPageTree);
}
/**
* Extract a sub tree.
*/
static subTree(tree: ContentPageTree, uniqueId: string): ContentPageTree {
Iif (!uniqueId) {
return tree;
}
const subTreeElements = Object.keys(tree.nodes)
.map(id => tree.nodes[id])
.filter(elements => elements.path.find(path => path === uniqueId))
.map(el => el.contentPageId);
const select = (e: string) => subTreeElements.find(el => el === e);
return {
rootIds: tree.rootIds.filter(select),
edges: pick(tree.edges, ...Object.keys(tree.edges).filter(select)),
nodes: pick(tree.nodes, ...Object.keys(tree.nodes).filter(select)),
};
}
/**
* Perform check for equality. Order of items is ignored.
*/
static equals(tree1: ContentPageTree, tree2: ContentPageTree): boolean {
return (
tree1 &&
tree2 &&
ContentPageTreeHelper.rootIdsEqual(tree1.rootIds, tree2.rootIds) &&
ContentPageTreeHelper.edgesEqual(tree1.edges, tree2.edges) &&
ContentPageTreeHelper.contentEqual(tree1.nodes, tree2.nodes)
);
}
private static removeDuplicates<T>(input: T[]): T[] {
return input.filter((value, index, array) => array.indexOf(value) === index);
}
private static mergeEdges(
current: { [id: string]: string[] },
incoming: { [id: string]: string[] }
): { [id: string]: string[] } {
const edges = { ...current };
Object.keys(incoming).forEach(key => {
if (current[key]) {
let master: string[];
let slave: string[];
// node with more available edges is trustworthy
if (incoming[key] && incoming[key].length > current[key].length) {
master = incoming[key];
slave = current[key];
} else {
master = current[key];
slave = incoming[key];
}
// add edges from both and remove duplicates
edges[key] = ContentPageTreeHelper.removeDuplicates([...master, ...slave]);
} else {
edges[key] = [...incoming[key]];
}
});
return edges;
}
private static mergeNodes(
current: { [id: string]: ContentPageTreeElement },
incoming: { [id: string]: ContentPageTreeElement }
): { [id: string]: ContentPageTreeElement } {
const nodes = { ...current };
Object.keys(incoming).forEach(key => {
nodes[key] = { ...incoming[key] };
});
return nodes;
}
private static mergeRootIDs(current: string[], incoming: string[]): string[] {
// node with more available rootIDs is trustworthy
if (incoming && incoming.length > current.length) {
return ContentPageTreeHelper.removeDuplicates([...incoming, ...current]);
} else {
return ContentPageTreeHelper.removeDuplicates([...current, ...incoming]);
}
}
private static rootIdsEqual(t1: string[], t2: string[]) {
return t1.length === t2.length && t1.every(e => t2.includes(e));
}
private static edgesEqual(t1: { [id: string]: string[] }, t2: { [id: string]: string[] }) {
return isEqual(t1, t2);
}
private static contentEqual(
t1: { [id: string]: ContentPageTreeElement },
t2: { [id: string]: ContentPageTreeElement }
) {
const keys1 = Object.keys(t1);
const keys2 = Object.keys(t2);
return (
keys1.length === keys2.length &&
keys1.every(id => keys2.includes(id)) &&
keys1.every(id => isEqual(t1[id], t2[id]))
);
}
}
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