applyProjection.js•2.69 kB
'use strict';
const hasIncludedChildren = require('./hasIncludedChildren');
const isExclusive = require('./isExclusive');
const isInclusive = require('./isInclusive');
const isPOJO = require('../../utils').isPOJO;
module.exports = function applyProjection(doc, projection, _hasIncludedChildren) {
if (projection == null) {
return doc;
}
if (doc == null) {
return doc;
}
let exclude = null;
if (isInclusive(projection)) {
exclude = false;
} else if (isExclusive(projection)) {
exclude = true;
}
if (exclude == null) {
return doc;
} else if (exclude) {
_hasIncludedChildren = _hasIncludedChildren || hasIncludedChildren(projection);
return applyExclusiveProjection(doc, projection, _hasIncludedChildren);
} else {
_hasIncludedChildren = _hasIncludedChildren || hasIncludedChildren(projection);
return applyInclusiveProjection(doc, projection, _hasIncludedChildren);
}
};
function applyExclusiveProjection(doc, projection, hasIncludedChildren, projectionLimb, prefix) {
if (doc == null || typeof doc !== 'object') {
return doc;
}
const ret = { ...doc };
projectionLimb = prefix ? (projectionLimb || {}) : projection;
for (const key of Object.keys(ret)) {
const fullPath = prefix ? prefix + '.' + key : key;
if (projection.hasOwnProperty(fullPath) || projectionLimb.hasOwnProperty(key)) {
if (isPOJO(projection[fullPath]) || isPOJO(projectionLimb[key])) {
ret[key] = applyExclusiveProjection(ret[key], projection, hasIncludedChildren, projectionLimb[key], fullPath);
} else {
delete ret[key];
}
} else if (hasIncludedChildren[fullPath]) {
ret[key] = applyExclusiveProjection(ret[key], projection, hasIncludedChildren, projectionLimb[key], fullPath);
}
}
return ret;
}
function applyInclusiveProjection(doc, projection, hasIncludedChildren, projectionLimb, prefix) {
if (doc == null || typeof doc !== 'object') {
return doc;
}
const ret = { ...doc };
projectionLimb = prefix ? (projectionLimb || {}) : projection;
for (const key of Object.keys(ret)) {
const fullPath = prefix ? prefix + '.' + key : key;
if (projection.hasOwnProperty(fullPath) || projectionLimb.hasOwnProperty(key)) {
if (isPOJO(projection[fullPath]) || isPOJO(projectionLimb[key])) {
ret[key] = applyInclusiveProjection(ret[key], projection, hasIncludedChildren, projectionLimb[key], fullPath);
}
continue;
} else if (hasIncludedChildren[fullPath]) {
ret[key] = applyInclusiveProjection(ret[key], projection, hasIncludedChildren, projectionLimb[key], fullPath);
} else {
delete ret[key];
}
}
return ret;
}