breeze-client
Version:
Breeze data management for JavaScript clients
192 lines • 26.4 kB
JavaScript
import { DataProperty } from './entity-metadata';
import { EntityKey } from './entity-key';
import { EntityState } from './entity-state';
import { MergeStrategy } from './query-options';
/** @hidden @internal */
export class EntityGroup {
entityManager;
entityType;
_indexMap;
_entities;
_emptyIndexes;
constructor(entityManager, entityType) {
this.entityManager = entityManager;
this.entityType = entityType;
// freeze the entityType after the first instance of this type is either created or queried.
this.entityType.isFrozen = true;
this._indexMap = {};
this._entities = [];
this._emptyIndexes = [];
}
attachEntity(entity, entityState, mergeStrategy) {
// entity should already have an aspect.
let aspect = entity.entityAspect;
if (!aspect._initialized) {
this.entityType._initializeInstance(entity);
}
delete aspect._initialized;
let keyInGroup = aspect.getKey()._keyInGroup;
let ix = this._indexMap[keyInGroup];
if (ix >= 0) {
// safecast because key was found not ix will not return a null
let targetEntity = this._entities[ix];
let targetEntityState = targetEntity.entityAspect.entityState;
let wasUnchanged = targetEntityState.isUnchanged();
if (targetEntity === entity) {
aspect.entityState = entityState;
}
else if (mergeStrategy === MergeStrategy.Disallowed) {
throw new Error("A MergeStrategy of 'Disallowed' does not allow you to attach an entity when an entity with the same key is already attached: " + aspect.getKey());
}
else if (mergeStrategy === MergeStrategy.OverwriteChanges || (mergeStrategy === MergeStrategy.PreserveChanges && wasUnchanged)) {
// unwrapInstance returns an entity with server side property names - so we need to use DataProperty.getRawValueFromServer these when we apply
// the property values back to the target.
let rawServerEntity = this.entityManager.helper.unwrapInstance(entity);
this.entityType._updateTargetFromRaw(targetEntity, rawServerEntity, DataProperty.getRawValueFromServer);
targetEntity.entityAspect.setEntityState(entityState);
}
return targetEntity;
}
else {
if (this._emptyIndexes.length === 0) {
ix = this._entities.push(entity) - 1;
}
else {
ix = this._emptyIndexes.pop();
this._entities[ix] = entity;
}
this._indexMap[keyInGroup] = ix;
aspect.entityState = entityState;
aspect.entityGroup = this;
aspect.entityManager = this.entityManager;
return entity;
}
}
detachEntity(entity) {
// by this point we have already determined that this entity
// belongs to this group.
let aspect = entity.entityAspect;
let keyInGroup = aspect.getKey()._keyInGroup;
let ix = this._indexMap[keyInGroup];
if (ix === undefined) {
// shouldn't happen.
throw new Error("internal error - entity cannot be found in group");
}
delete this._indexMap[keyInGroup];
this._emptyIndexes.push(ix);
this._entities[ix] = null;
return entity;
}
// returns entity based on an entity key defined either as an array of key values or an EntityKey
findEntityByKey(entityKey) {
let keyInGroup;
if (entityKey instanceof EntityKey) {
keyInGroup = entityKey._keyInGroup;
}
else {
keyInGroup = EntityKey.createKeyString(entityKey);
}
let ix = this._indexMap[keyInGroup];
// can't use just (ix) below because 0 is valid
let r = (ix !== undefined) ? this._entities[ix] : undefined;
// coerce null to undefined
return r == null ? undefined : r;
}
hasChanges() {
let entities = this._entities;
let unchanged = EntityState.Unchanged;
for (let i = 0, len = entities.length; i < len; i++) {
let e = entities[i];
if (e && e.entityAspect.entityState !== unchanged) {
return true;
}
}
return false;
}
getChanges() {
let entities = this._entities;
let unchanged = EntityState.Unchanged;
let changes = [];
for (let i = 0, len = entities.length; i < len; i++) {
let e = entities[i];
if (e && e.entityAspect.entityState !== unchanged) {
changes.push(e);
}
}
return changes;
}
getEntities(entityStates) {
let filter = getFilter(entityStates);
return this._entities.filter(filter);
}
_checkOperation(operationName) {
this._entities.forEach(function (entity) {
entity && entity.entityAspect._checkOperation(operationName);
});
// for chaining;
return this;
}
// do not expose this method. It is doing a special purpose INCOMPLETE fast detach operation
// just for the entityManager clear method - the entityGroup will be in an inconsistent state
// after this op, which is ok because it will be thrown away.
// TODO: rename this to be clear that it is UNSAFE...
_clear() {
this._entities.forEach(function (entity) {
if (entity != null) {
entity.entityAspect._detach();
}
});
this._entities = null;
this._indexMap = null;
this._emptyIndexes = null;
}
_updateFkVal(fkProp, oldValue, newValue) {
let fkPropName = fkProp.name;
this._entities.forEach(function (entity) {
if (entity != null) {
if (entity.getProperty(fkPropName) === oldValue) {
entity.setProperty(fkPropName, newValue);
}
}
});
}
_fixupKey(tempValue, realValue) {
// single part keys appear directly in map
let ix = this._indexMap[tempValue];
if (ix === undefined) {
throw new Error("Internal Error in key fixup - unable to locate entity");
}
let entity = this._entities[ix];
let keyPropName = entity.entityType.keyProperties[0].name;
// fks on related entities will automatically get updated by this as well
entity.setProperty(keyPropName, realValue);
delete entity.entityAspect.hasTempKey;
delete this._indexMap[tempValue];
this._indexMap[realValue] = ix;
}
_replaceKey(oldKey, newKey) {
let ix = this._indexMap[oldKey._keyInGroup];
delete this._indexMap[oldKey._keyInGroup];
this._indexMap[newKey._keyInGroup] = ix;
}
}
function getFilter(entityStates) {
if (entityStates.length === 0) {
return function (e) {
return !!e;
};
}
else if (entityStates.length === 1) {
let entityState = entityStates[0];
return function (e) {
return !!e && e.entityAspect.entityState === entityState;
};
}
else {
return function (e) {
return !!e && -1 !== entityStates.indexOf(e.entityAspect.entityState);
};
}
}
// do not expose EntityGroup - internal only
//# 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{ Entity } from './entity-aspect';\r\nimport { EntityType, DataProperty  } from './entity-metadata';\r\nimport { EntityKey } from './entity-key';\r\nimport { EntityState } from './entity-state';\r\nimport { EntityManager } from './entity-manager';\r\nimport { MergeStrategy } from './query-options';\r\n\r\n/** @hidden @internal */\r\nexport class EntityGroup {\r\n  entityManager: EntityManager;\r\n  entityType: EntityType;\r\n  _indexMap: { [index: string]: number };\r\n  _entities: (Entity | null)[];\r\n  _emptyIndexes: number[];\r\n\r\n  constructor(entityManager: EntityManager, entityType: EntityType) {\r\n    this.entityManager = entityManager;\r\n    this.entityType = entityType;\r\n    // freeze the entityType after the first instance of this type is either created or queried.\r\n    this.entityType.isFrozen = true;\r\n    this._indexMap = {};\r\n    this._entities = [];\r\n    this._emptyIndexes = [];\r\n  }\r\n\r\n\r\n  attachEntity(entity: Entity, entityState: EntityState, mergeStrategy?: MergeStrategy) {\r\n    // entity should already have an aspect.\r\n    let aspect = entity.entityAspect;\r\n\r\n    if (!aspect._initialized) {\r\n      this.entityType._initializeInstance(entity);\r\n    }\r\n    delete aspect._initialized;\r\n\r\n    let keyInGroup = aspect.getKey()._keyInGroup;\r\n    let ix = this._indexMap[keyInGroup];\r\n    if (ix >= 0) {\r\n      // safecast because key was found not ix will not return a null\r\n      let targetEntity = this._entities[ix] as Entity;\r\n      let targetEntityState = targetEntity.entityAspect.entityState;\r\n      let wasUnchanged = targetEntityState.isUnchanged();\r\n      if (targetEntity === entity) {\r\n        aspect.entityState = entityState;\r\n      } else if (mergeStrategy === MergeStrategy.Disallowed) {\r\n        throw new Error(\"A MergeStrategy of 'Disallowed' does not allow you to attach an entity when an entity with the same key is already attached: \" + aspect.getKey());\r\n      } else if (mergeStrategy === MergeStrategy.OverwriteChanges || (mergeStrategy === MergeStrategy.PreserveChanges && wasUnchanged)) {\r\n        // unwrapInstance returns an entity with server side property names - so we need to use DataProperty.getRawValueFromServer these when we apply\r\n        // the property values back to the target.\r\n        let rawServerEntity = this.entityManager.helper.unwrapInstance(entity);\r\n        this.entityType._updateTargetFromRaw(targetEntity, rawServerEntity, DataProperty.getRawValueFromServer);\r\n        targetEntity.entityAspect.setEntityState(entityState);\r\n      }\r\n      return targetEntity;\r\n    } else {\r\n      if (this._emptyIndexes.length === 0) {\r\n        ix = this._entities.push(entity) - 1;\r\n      } else {\r\n        ix = this._emptyIndexes.pop();\r\n        this._entities[ix] = entity;\r\n      }\r\n      this._indexMap[keyInGroup] = ix;\r\n      aspect.entityState = entityState;\r\n      aspect.entityGroup = this;\r\n      aspect.entityManager = this.entityManager;\r\n      return entity;\r\n    }\r\n  }\r\n\r\n  detachEntity(entity: Entity) {\r\n    // by this point we have already determined that this entity\r\n    // belongs to this group.\r\n    let aspect = entity.entityAspect;\r\n    let keyInGroup = aspect.getKey()._keyInGroup;\r\n    let ix = this._indexMap[keyInGroup];\r\n    if (ix === undefined) {\r\n      // shouldn't happen.\r\n      throw new Error(\"internal error - entity cannot be found in group\");\r\n    }\r\n    delete this._indexMap[keyInGroup];\r\n    this._emptyIndexes.push(ix);\r\n    this._entities[ix] = null;\r\n    return entity;\r\n  }\r\n\r\n\r\n  // returns entity based on an entity key defined either as an array of key values or an EntityKey\r\n  findEntityByKey(entityKey: EntityKey) {\r\n    let keyInGroup: string;\r\n    if (entityKey instanceof EntityKey) {\r\n      keyInGroup = entityKey._keyInGroup;\r\n    } else {\r\n      keyInGroup = EntityKey.createKeyString(entityKey);\r\n    }\r\n    let ix = this._indexMap[keyInGroup];\r\n    // can't use just (ix) below because 0 is valid\r\n    let r = (ix !== undefined) ? this._entities[ix] : undefined;\r\n    // coerce null to undefined\r\n    return r == null ? undefined : r;\r\n  }\r\n\r\n  hasChanges() {\r\n    let entities = this._entities;\r\n    let unchanged = EntityState.Unchanged;\r\n    for (let i = 0, len = entities.length; i < len; i++) {\r\n      let e = entities[i];\r\n      if (e && e.entityAspect.entityState !== unchanged) {\r\n        return true;\r\n      }\r\n    }\r\n    return false;\r\n  }\r\n\r\n  getChanges() {\r\n    let entities = this._entities;\r\n    let unchanged = EntityState.Unchanged;\r\n    let changes: Entity[] = [];\r\n    for (let i = 0, len = entities.length; i < len; i++) {\r\n      let e = entities[i];\r\n      if (e && e.entityAspect.entityState !== unchanged) {\r\n        changes.push(e);\r\n      }\r\n    }\r\n    return changes;\r\n  }\r\n\r\n  getEntities(entityStates: EntityState[]) {\r\n    let filter = getFilter(entityStates);\r\n    return this._entities.filter(filter) as Entity[];\r\n  }\r\n\r\n  _checkOperation(operationName: string) {\r\n    this._entities.forEach(function (entity) {\r\n      entity && entity.entityAspect._checkOperation(operationName);\r\n    });\r\n    // for chaining;\r\n    return this;\r\n  }\r\n\r\n  // do not expose this method. It is doing a special purpose INCOMPLETE fast detach operation\r\n  // just for the entityManager clear method - the entityGroup will be in an inconsistent state\r\n  // after this op, which is ok because it will be thrown away.\r\n  // TODO: rename this to be clear that it is UNSAFE...\r\n  _clear() {\r\n    this._entities.forEach(function (entity) {\r\n      if (entity != null) {\r\n        entity.entityAspect._detach();\r\n      }\r\n    });\r\n    (this as any)._entities = null;\r\n    (this as any)._indexMap = null;\r\n    (this as any)._emptyIndexes = null;\r\n  }\r\n\r\n  _updateFkVal(fkProp: DataProperty, oldValue: any, newValue: any) {\r\n    let fkPropName = fkProp.name;\r\n    this._entities.forEach(function (entity) {\r\n      if (entity != null) {\r\n        if (entity.getProperty(fkPropName) === oldValue) {\r\n          entity.setProperty(fkPropName, newValue);\r\n        }\r\n      }\r\n    });\r\n  }\r\n\r\n  _fixupKey(tempValue: any, realValue: any) {\r\n    // single part keys appear directly in map\r\n    let ix = this._indexMap[tempValue];\r\n    if (ix === undefined) {\r\n      throw new Error(\"Internal Error in key fixup - unable to locate entity\");\r\n    }\r\n    let entity = this._entities[ix] as Entity;\r\n    let keyPropName = entity.entityType.keyProperties[0].name;\r\n    // fks on related entities will automatically get updated by this as well\r\n    entity.setProperty(keyPropName, realValue);\r\n    delete entity.entityAspect.hasTempKey;\r\n    delete this._indexMap[tempValue];\r\n    this._indexMap[realValue] = ix;\r\n  }\r\n\r\n  _replaceKey(oldKey: EntityKey, newKey: EntityKey) {\r\n    let ix = this._indexMap[oldKey._keyInGroup];\r\n    delete this._indexMap[oldKey._keyInGroup];\r\n    this._indexMap[newKey._keyInGroup] = ix;\r\n  }\r\n\r\n}\r\n\r\nfunction getFilter(entityStates: EntityState[]) {\r\n  if (entityStates.length === 0) {\r\n    return function (e: Entity) {\r\n      return !!e;\r\n    };\r\n  } else if (entityStates.length === 1) {\r\n    let entityState = entityStates[0];\r\n    return function (e: Entity) {\r\n      return !!e && e.entityAspect.entityState === entityState;\r\n    };\r\n  } else {\r\n    return function (e: Entity) {\r\n      return !!e && -1 !== entityStates.indexOf(e.entityAspect.entityState);\r\n    };\r\n  }\r\n}\r\n\r\n\r\n// do not expose EntityGroup - internal only\r\n\r\n\r\n"]}