pip-services3-commons-node
Version:
Portable abstractions and patterns for Pip.Services in Node.js
189 lines • 7.63 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
/** @module reflect */
/** @hidden */
var _ = require('lodash');
var TypeCode_1 = require("../convert/TypeCode");
var TypeConverter_1 = require("../convert/TypeConverter");
var ObjectReader_1 = require("./ObjectReader");
/**
* Helper class to perform property introspection and dynamic reading.
*
* It is similar to [[ObjectReader]] but reads properties recursively
* through the entire object graph. Nested property names are defined
* using dot notation as "object.subobject.property"
*
* @see [[PropertyReflector]]
* @see [[ObjectReader]]
*/
var RecursiveObjectReader = /** @class */ (function () {
function RecursiveObjectReader() {
}
RecursiveObjectReader.performHasProperty = function (obj, names, nameIndex) {
if (nameIndex < names.length - 1) {
var value = ObjectReader_1.ObjectReader.getProperty(obj, names[nameIndex]);
if (value != null)
return RecursiveObjectReader.performHasProperty(value, names, nameIndex + 1);
else
return false;
}
else
return ObjectReader_1.ObjectReader.hasProperty(obj, names[nameIndex]);
};
/**
* Checks recursively if object or its subobjects has a property with specified name.
*
* The object can be a user defined object, map or array.
* The property name correspondently must be object property,
* map key or array index.
*
* @param obj an object to introspect.
* @param name a name of the property to check.
* @returns true if the object has the property and false if it doesn't.
*/
RecursiveObjectReader.hasProperty = function (obj, name) {
if (obj == null || name == null)
return false;
var names = name.split(".");
if (names == null || names.length == 0)
return false;
return RecursiveObjectReader.performHasProperty(obj, names, 0);
};
RecursiveObjectReader.performGetProperty = function (obj, names, nameIndex) {
if (nameIndex < names.length - 1) {
var value = ObjectReader_1.ObjectReader.getProperty(obj, names[nameIndex]);
if (value != null)
return RecursiveObjectReader.performGetProperty(value, names, nameIndex + 1);
else
return null;
}
else
return ObjectReader_1.ObjectReader.getProperty(obj, names[nameIndex]);
};
/**
* Recursively gets value of object or its subobjects property specified by its name.
*
* The object can be a user defined object, map or array.
* The property name correspondently must be object property,
* map key or array index.
*
* @param obj an object to read property from.
* @param name a name of the property to get.
* @returns the property value or null if property doesn't exist or introspection failed.
*/
RecursiveObjectReader.getProperty = function (obj, name) {
if (obj == null || name == null)
return null;
var names = name.split(".");
if (names == null || names.length == 0)
return null;
return RecursiveObjectReader.performGetProperty(obj, names, 0);
};
RecursiveObjectReader.isSimpleValue = function (value) {
var code = TypeConverter_1.TypeConverter.toTypeCode(value);
return code != TypeCode_1.TypeCode.Array && code != TypeCode_1.TypeCode.Map && code != TypeCode_1.TypeCode.Object;
};
RecursiveObjectReader.performGetPropertyNames = function (obj, path, result, cycleDetect) {
var map = ObjectReader_1.ObjectReader.getProperties(obj);
if (!_.isEmpty(map) && cycleDetect.length < 100) {
cycleDetect.push(obj);
try {
for (var key in map) {
var value = map[key];
// Prevent cycles
if (cycleDetect.indexOf(value) >= 0)
continue;
var newPath = path != null ? path + "." + key : key;
// Add simple values directly
if (RecursiveObjectReader.isSimpleValue(value))
result.push(newPath);
// Recursively go to elements
else
RecursiveObjectReader.performGetPropertyNames(value, newPath, result, cycleDetect);
}
}
finally {
var index = cycleDetect.indexOf(obj);
if (index >= 0)
cycleDetect.splice(index, 1);
}
}
else {
if (path != null)
result.push(path);
}
};
/**
* Recursively gets names of all properties implemented in specified object and its subobjects.
*
* The object can be a user defined object, map or array.
* Returned property name correspondently are object properties,
* map keys or array indexes.
*
* @param obj an objec to introspect.
* @returns a list with property names.
*/
RecursiveObjectReader.getPropertyNames = function (obj) {
var propertyNames = [];
if (obj == null) {
return propertyNames;
}
else {
var cycleDetect = [];
RecursiveObjectReader.performGetPropertyNames(obj, null, propertyNames, cycleDetect);
return propertyNames;
}
};
RecursiveObjectReader.performGetProperties = function (obj, path, result, cycleDetect) {
var map = ObjectReader_1.ObjectReader.getProperties(obj);
if (!_.isEmpty(map) && cycleDetect.length < 100) {
cycleDetect.push(obj);
try {
for (var key in map) {
var value = map[key];
// Prevent cycles
if (cycleDetect.indexOf(value) >= 0)
continue;
var newPath = path != null ? path + "." + key : key;
// Add simple values directly
if (RecursiveObjectReader.isSimpleValue(value))
result[newPath] = value;
// Recursively go to elements
else
RecursiveObjectReader.performGetProperties(value, newPath, result, cycleDetect);
}
}
finally {
var index = cycleDetect.indexOf(obj);
if (index >= 0)
cycleDetect.splice(index, 1);
}
}
else {
if (path != null)
result[path] = obj;
}
};
/**
* Get values of all properties in specified object and its subobjects
* and returns them as a map.
*
* The object can be a user defined object, map or array.
* Returned properties correspondently are object properties,
* map key-pairs or array elements with their indexes.
*
* @param obj an object to get properties from.
* @returns a map, containing the names of the object's properties and their values.
*/
RecursiveObjectReader.getProperties = function (obj) {
var properties = {};
if (obj != null) {
var cycleDetect = [];
RecursiveObjectReader.performGetProperties(obj, null, properties, cycleDetect);
}
return properties;
};
return RecursiveObjectReader;
}());
exports.RecursiveObjectReader = RecursiveObjectReader;
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