breeze-client
Version:
Breeze data management for JavaScript clients
269 lines • 35 kB
JavaScript
import * as breeze from 'breeze-client';
let core = breeze.core;
export class ModelLibraryBackingStoreAdapter {
name;
constructor() {
this.name = "backingStore";
}
static register(config) {
config = config || breeze.config;
config.registerAdapter("modelLibrary", ModelLibraryBackingStoreAdapter);
return config.initializeAdapterInstance("modelLibrary", "backingStore", true);
}
initialize() {
}
getTrackablePropertyNames(entity) {
let names = [];
for (let p in entity) {
if (p === "entityAspect" || p === "entityType")
continue;
if (p === "_$typeName" || p === "_pendingSets" || p === "_backingStore")
continue;
let val = entity[p];
if (!core.isFunction(val)) {
names.push(p);
}
}
return names;
}
// This method is called during Metadata initialization
initializeEntityPrototype(proto) {
proto.getProperty = function (propertyName) {
return this[propertyName];
};
proto.setProperty = function (propertyName, value) {
//if (!this._backingStore.hasOwnProperty(propertyName)) {
// throw new Error("Unknown property name:" + propertyName);
//}
this[propertyName] = value;
// allow setProperty chaining.
return this;
};
movePropDefsToProto(proto);
}
// This method is called when an EntityAspect is first created - this will occur as part of the entityType.createEntity call.
// which can be called either directly or via standard query materialization
// entity is either an entity or a complexObject
startTracking(entity, proto) {
// can't touch the normal property sets within this method - access the backingStore directly instead.
let bs = movePropsToBackingStore(entity);
// assign default values to the entity
let stype = breeze.EntityAspect.isEntity(entity) ? entity.entityType : entity.complexType;
stype.getProperties().forEach(function (prop) {
let propName = prop.name;
let val = entity[propName];
if (prop instanceof breeze.DataProperty) {
if (prop.isComplexProperty) {
if (prop.isScalar) {
val = prop.dataType._createInstanceCore(entity, prop);
}
else {
val = breeze.makeComplexArray([], entity, prop);
}
}
else if (!prop.isScalar) {
val = breeze.makePrimitiveArray([], entity, prop);
}
else if (val === undefined) {
val = prop.defaultValue;
}
}
else if (prop.isNavigationProperty) {
if (val !== undefined && val !== null) {
throw new Error("Cannot assign a navigation property in an entity ctor.: " + propName);
}
if (prop.isScalar) {
// TODO: change this to nullstob later.
val = null;
}
else {
val = breeze.makeRelationArray([], entity, prop);
}
}
else {
throw new Error("unknown property: " + propName);
}
// can't touch the normal property sets within this method (IE9 Bug) - so we access the backingStore directly instead.
// otherwise we could just do
// entity[propName] = val
// after all of the interception logic had been injected.
if (prop.isSettable || prop.isNavigationProperty) {
bs[propName] = val;
}
});
}
}
breeze.config.registerAdapter("modelLibrary", ModelLibraryBackingStoreAdapter);
// private methods
// This method is called during Metadata initialization to correctly "wrap" properties.
function movePropDefsToProto(proto) {
let stype = (proto.entityType || proto.complexType);
let extra = stype._extra;
let alreadyWrapped = extra.alreadyWrappedProps || {};
stype.getProperties().forEach(function (prop) {
let propName = prop.name;
// we only want to wrap props that haven't already been wrapped
if (alreadyWrapped[propName])
return;
// If property is already defined on the prototype then wrap it in another propertyDescriptor.
// otherwise create a propDescriptor for it.
let descr;
if (propName in proto) {
descr = wrapPropDescription(proto, prop);
}
else {
descr = makePropDescription(proto, prop);
}
// descr will be null for a wrapped descr that is not configurable
if (descr != null) {
Object.defineProperty(proto, propName, descr);
}
alreadyWrapped[propName] = true;
});
extra.alreadyWrappedProps = alreadyWrapped;
}
// This method is called when an instance is first created via materialization or createEntity.
// this method cannot be called while a 'defineProperty' accessor is executing
// because of IE bug mentioned above.
function movePropsToBackingStore(instance) {
let bs = getBackingStore(instance);
let proto = Object.getPrototypeOf(instance);
let stype = (proto.entityType || proto.complexType);
stype.getProperties().forEach(function (prop) {
let propName = prop.name;
if (prop.isUnmapped) {
// insure that any unmapped properties that were added after entityType
// was first created are wrapped with a property descriptor.
if (!core.getPropertyDescriptor(proto, propName)) {
let descr = makePropDescription(proto, prop);
Object.defineProperty(proto, propName, descr);
}
}
if (!instance.hasOwnProperty(propName))
return;
// pulls off the value, removes the instance property and then rewrites it via ES5 accessor
let value = instance[propName];
delete instance[propName];
instance[propName] = value;
});
return bs;
}
function makePropDescription(proto, property) {
let propName = property.name;
let pendingStores = proto._pendingBackingStores;
if (!pendingStores) {
pendingStores = [];
proto._pendingBackingStores = pendingStores;
}
let descr = {
get: function () {
let bs = this._backingStore || getBackingStore(this);
return bs[propName];
},
set: function (value) {
// IE9 cannot touch instance._backingStore here
let bs = this._backingStore || getPendingBackingStore(this);
let accessorFn = getAccessorFn(bs, propName);
this._$interceptor(property, value, accessorFn);
},
enumerable: true,
configurable: true
};
descr.set.rawSet = function (value) {
let bs = this._backingStore || getPendingBackingStore(this);
let accessorFn = getAccessorFn(bs, propName);
accessorFn(value);
};
return descr;
}
function getAccessorFn(bs, propName) {
return function () {
if (arguments.length === 0) {
return bs[propName];
}
else {
bs[propName] = arguments[0];
return undefined;
}
};
}
function wrapPropDescription(proto, property) {
if (!proto.hasOwnProperty(property.name)) {
let nextProto = Object.getPrototypeOf(proto);
return wrapPropDescription(nextProto, property);
}
let propDescr = Object.getOwnPropertyDescriptor(proto, property.name);
if (!propDescr)
return undefined;
// if not configurable; we can't touch it - so leave.
if (!propDescr.configurable)
return undefined;
// if a data descriptor - don't change it - this is basically a static property - i.e. defined on every instance of the type with the same value.
if (propDescr.value)
return undefined;
// if a read only property descriptor - no need to change it.
if (!propDescr.set)
return undefined;
let localAccessorFn = function (entity) {
return function () {
if (!propDescr)
return undefined;
if (arguments.length === 0) {
return propDescr.get.bind(entity)();
}
else {
let set = propDescr.set;
let rawSet = set.rawSet || set;
rawSet.bind(entity)(arguments[0]);
return undefined;
}
};
};
let newDescr = {
get: function () {
if (!propDescr)
return undefined;
return propDescr.get.bind(this)();
},
set: function (value) {
this._$interceptor(property, value, localAccessorFn(this));
},
enumerable: propDescr.enumerable,
configurable: true
};
newDescr.set.rawSet = propDescr.set;
return newDescr;
}
function getBackingStore(instance) {
let proto = Object.getPrototypeOf(instance);
processPendingStores(proto);
let bs = instance._backingStore;
if (!bs) {
bs = {};
instance._backingStore = bs;
}
return bs;
}
// workaround for IE9 bug where instance properties cannot be changed when executing a property 'set' method.
function getPendingBackingStore(instance) {
let proto = Object.getPrototypeOf(instance);
let pendingStores = proto._pendingBackingStores;
let pending = core.arrayFirst(pendingStores, function (pending) {
return pending.entity === instance;
});
if (pending)
return pending.backingStore;
let bs = {};
pendingStores.push({ entity: instance, backingStore: bs });
return bs;
}
function processPendingStores(proto) {
let pendingStores = proto._pendingBackingStores;
if (pendingStores) {
pendingStores.forEach(function (pending) {
pending.entity._backingStore = pending.backingStore;
});
pendingStores.length = 0;
}
}
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* as breeze from 'breeze-client';\r\n\r\nlet core = breeze.core;\r\n\r\nexport class ModelLibraryBackingStoreAdapter implements breeze.ModelLibraryAdapter {\r\n  name: string;\r\n\r\n  constructor() {\r\n    this.name = \"backingStore\";\r\n  }\r\n\r\n  static register(config?: breeze.BreezeConfig) {\r\n    config = config || breeze.config;\r\n    config.registerAdapter(\"modelLibrary\", ModelLibraryBackingStoreAdapter);\r\n    return config.initializeAdapterInstance(\"modelLibrary\", \"backingStore\", true) as ModelLibraryBackingStoreAdapter;\r\n  }\r\n\r\n  initialize() {\r\n  }\r\n\r\n  getTrackablePropertyNames(entity: breeze.Entity) {\r\n    let names: string[] = [];\r\n    for (let p in entity) {\r\n      if (p === \"entityAspect\" || p === \"entityType\") continue;\r\n      if (p === \"_$typeName\" || p === \"_pendingSets\" || p === \"_backingStore\") continue;\r\n      let val = entity[p];\r\n      if (!core.isFunction(val)) {\r\n        names.push(p);\r\n      }\r\n    }\r\n    return names;\r\n  }\r\n\r\n  // This method is called during Metadata initialization\r\n  initializeEntityPrototype(proto: any) {\r\n\r\n    proto.getProperty = function (propertyName: string) {\r\n      return this[propertyName];\r\n    };\r\n\r\n    proto.setProperty = function (propertyName: string, value: any) {\r\n      //if (!this._backingStore.hasOwnProperty(propertyName)) {\r\n      //    throw new Error(\"Unknown property name:\" + propertyName);\r\n      //}\r\n      this[propertyName] = value;\r\n      // allow setProperty chaining.\r\n      return this;\r\n    };\r\n\r\n    movePropDefsToProto(proto);\r\n  }\r\n\r\n  // This method is called when an EntityAspect is first created - this will occur as part of the entityType.createEntity call.\r\n  // which can be called either directly or via standard query materialization\r\n\r\n  // entity is either an entity or a complexObject\r\n  startTracking(entity: breeze.StructuralObject, proto: any) {\r\n    // can't touch the normal property sets within this method - access the backingStore directly instead.\r\n    let bs = movePropsToBackingStore(entity);\r\n\r\n    // assign default values to the entity\r\n    let stype = breeze.EntityAspect.isEntity(entity) ? entity.entityType : entity.complexType;\r\n    stype.getProperties().forEach(function (prop) {\r\n\r\n      let propName = prop.name;\r\n      let val = entity[propName];\r\n\r\n      if (prop instanceof breeze.DataProperty) {\r\n        if (prop.isComplexProperty) {\r\n          if (prop.isScalar) {\r\n            val = (prop.dataType as breeze.ComplexType)._createInstanceCore(entity, prop);\r\n          } else {\r\n            val = breeze.makeComplexArray([], entity, prop);\r\n          }\r\n        } else if (!prop.isScalar) {\r\n          val = breeze.makePrimitiveArray([], entity, prop);\r\n        } else if (val === undefined) {\r\n          val = prop.defaultValue;\r\n        }\r\n\r\n      } else if (prop.isNavigationProperty) {\r\n        if (val !== undefined && val !== null) {\r\n          throw new Error(\"Cannot assign a navigation property in an entity ctor.: \" + propName);\r\n        }\r\n        if (prop.isScalar) {\r\n          // TODO: change this to nullstob later.\r\n          val = null;\r\n        } else {\r\n          val = breeze.makeRelationArray([], entity as breeze.Entity, prop);\r\n        }\r\n      } else {\r\n        throw new Error(\"unknown property: \" + propName);\r\n      }\r\n      // can't touch the normal property sets within this method (IE9 Bug) - so we access the backingStore directly instead.\r\n      // otherwise we could just do\r\n      // entity[propName] = val\r\n      // after all of the interception logic had been injected.\r\n      if ((prop as breeze.DataProperty).isSettable || prop.isNavigationProperty) {\r\n        bs[propName] = val;\r\n      }\r\n    });\r\n  }\r\n}\r\n\r\nbreeze.config.registerAdapter(\"modelLibrary\", ModelLibraryBackingStoreAdapter);\r\n\r\n// private methods\r\n\r\n// This method is called during Metadata initialization to correctly \"wrap\" properties.\r\nfunction movePropDefsToProto(proto: any) {\r\n  let stype = (proto.entityType || proto.complexType) as breeze.StructuralType;\r\n  let extra = stype._extra;\r\n\r\n  let alreadyWrapped = extra.alreadyWrappedProps || {};\r\n\r\n  stype.getProperties().forEach(function (prop) {\r\n    let propName = prop.name;\r\n    // we only want to wrap props that haven't already been wrapped\r\n    if (alreadyWrapped[propName]) return;\r\n\r\n    // If property is already defined on the prototype then wrap it in another propertyDescriptor.\r\n    // otherwise create a propDescriptor for it.\r\n    let descr: any;\r\n    if (propName in proto) {\r\n      descr = wrapPropDescription(proto, prop);\r\n    } else {\r\n      descr = makePropDescription(proto, prop);\r\n    }\r\n    // descr will be null for a wrapped descr that is not configurable\r\n    if (descr != null) {\r\n      Object.defineProperty(proto, propName, descr);\r\n    }\r\n    alreadyWrapped[propName] = true;\r\n  });\r\n  extra.alreadyWrappedProps = alreadyWrapped;\r\n}\r\n\r\n// This method is called when an instance is first created via materialization or createEntity.\r\n// this method cannot be called while a 'defineProperty' accessor is executing\r\n// because of IE bug mentioned above.\r\n\r\nfunction movePropsToBackingStore(instance: any) {\r\n\r\n  let bs = getBackingStore(instance);\r\n  let proto = Object.getPrototypeOf(instance);\r\n  let stype = (proto.entityType || proto.complexType) as breeze.StructuralType;\r\n  stype.getProperties().forEach(function (prop) {\r\n    let propName = prop.name;\r\n    if (prop.isUnmapped) {\r\n      // insure that any unmapped properties that were added after entityType\r\n      // was first created are wrapped with a property descriptor.\r\n      if (!core.getPropertyDescriptor(proto, propName)) {\r\n        let descr = makePropDescription(proto, prop);\r\n        Object.defineProperty(proto, propName, descr);\r\n      }\r\n    }\r\n    if (!instance.hasOwnProperty(propName)) return;\r\n    // pulls off the value, removes the instance property and then rewrites it via ES5 accessor\r\n    let value = instance[propName];\r\n    delete instance[propName];\r\n    instance[propName] = value;\r\n  });\r\n  return bs;\r\n}\r\n\r\nfunction makePropDescription(proto: any, property: breeze.EntityProperty) {\r\n  let propName = property.name;\r\n  let pendingStores = proto._pendingBackingStores;\r\n  if (!pendingStores) {\r\n    pendingStores = [];\r\n    proto._pendingBackingStores = pendingStores;\r\n  }\r\n  let descr = {\r\n    get: function () {\r\n      let bs = this._backingStore || getBackingStore(this);\r\n      return bs[propName];\r\n    },\r\n    set: function (value: any) {\r\n      // IE9 cannot touch instance._backingStore here\r\n      let bs = this._backingStore || getPendingBackingStore(this);\r\n      let accessorFn = getAccessorFn(bs, propName);\r\n      this._$interceptor(property, value, accessorFn);\r\n    },\r\n    enumerable: true,\r\n    configurable: true\r\n  };\r\n\r\n  (descr.set as any).rawSet = function (value: any) {\r\n    let bs = this._backingStore || getPendingBackingStore(this);\r\n    let accessorFn = getAccessorFn(bs, propName);\r\n    accessorFn(value);\r\n  };\r\n  return descr;\r\n\r\n}\r\n\r\nfunction getAccessorFn(bs: {}, propName: string): any {\r\n  return function () {\r\n    if (arguments.length === 0) {\r\n      return bs[propName];\r\n    } else {\r\n      bs[propName] = arguments[0];\r\n      return undefined;\r\n    }\r\n  };\r\n}\r\n\r\nfunction wrapPropDescription(proto: any, property: breeze.EntityProperty): any {\r\n  if (!proto.hasOwnProperty(property.name)) {\r\n    let nextProto = Object.getPrototypeOf(proto);\r\n    return wrapPropDescription(nextProto, property);\r\n  }\r\n\r\n  let propDescr = Object.getOwnPropertyDescriptor(proto, property.name);\r\n  if (!propDescr) return undefined;\r\n  // if not configurable; we can't touch it - so leave.\r\n  if (!propDescr.configurable) return undefined;\r\n  // if a data descriptor - don't change it - this is basically a static property - i.e. defined on every instance of the type with the same value.\r\n  if (propDescr.value) return undefined;\r\n  // if a read only property descriptor - no need to change it.\r\n  if (!propDescr.set) return undefined;\r\n\r\n  let localAccessorFn = function (entity: any) {\r\n    return function () {\r\n      if (!propDescr) return undefined;\r\n      if (arguments.length === 0) {\r\n        return propDescr.get!.bind(entity)();\r\n      } else {\r\n        let set = propDescr.set;\r\n        let rawSet = (set as any).rawSet || set;\r\n        rawSet.bind(entity)(arguments[0]);\r\n        return undefined;\r\n      }\r\n    };\r\n  };\r\n\r\n  let newDescr = {\r\n    get: function () {\r\n      if (!propDescr) return undefined;\r\n      return propDescr.get!.bind(this)();\r\n    },\r\n    set: function (value: any) {\r\n      this._$interceptor(property, value, localAccessorFn(this));\r\n    },\r\n    enumerable: propDescr.enumerable,\r\n    configurable: true\r\n  };\r\n  (newDescr.set as any).rawSet = propDescr.set;\r\n  return newDescr;\r\n}\r\n\r\n\r\nfunction getBackingStore(instance: any) {\r\n  let proto = Object.getPrototypeOf(instance);\r\n  processPendingStores(proto);\r\n  let bs = instance._backingStore;\r\n  if (!bs) {\r\n    bs = {};\r\n    instance._backingStore = bs;\r\n  }\r\n  return bs;\r\n}\r\n\r\n// workaround for IE9 bug where instance properties cannot be changed when executing a property 'set' method.\r\nfunction getPendingBackingStore(instance: any) {\r\n  let proto = Object.getPrototypeOf(instance);\r\n  let pendingStores = proto._pendingBackingStores;\r\n  let pending = core.arrayFirst(pendingStores, function (pending) {\r\n    return pending.entity === instance;\r\n  });\r\n  if (pending) return (pending as any).backingStore;\r\n  let bs = {};\r\n  pendingStores.push({ entity: instance, backingStore: bs });\r\n  return bs;\r\n}\r\n\r\nfunction processPendingStores(proto: any) {\r\n  let pendingStores = proto._pendingBackingStores;\r\n  if (pendingStores) {\r\n    pendingStores.forEach(function (pending: any) {\r\n      pending.entity._backingStore = pending.backingStore;\r\n    });\r\n    pendingStores.length = 0;\r\n  }\r\n}\r\n\r\n"]}