Golang AnnotatedValue.SetAnnotations方法代码示例

func (this *IndexNest) fetch(entries []*datastore.IndexEntry, context *Context) (
	[]interface{}, bool) {
	// Build list of keys
	var keys []string
	if len(entries) <= 16 {
		keys = _NEST_INDEX_STRING_POOL.Get()
		defer _NEST_INDEX_STRING_POOL.Put(keys)
	} else {
		keys = make([]string, 0, len(entries))
	}

	for _, e := range entries {
		keys = append(keys, e.PrimaryKey)
	}

	// Fetch
	pairs, errs := this.plan.Keyspace().Fetch(keys)

	fetchOk := true
	for _, err := range errs {
		context.Error(err)
		if err.IsFatal() {
			fetchOk = false
		}
	}

	if len(pairs) == 0 {
		return nil, fetchOk
	}

	projection := this.plan.Term().Projection()
	nvs := make([]interface{}, 0, len(pairs))
	for _, pair := range pairs {
		nestItem := pair.Value
		var nv value.AnnotatedValue

		// Apply projection, if any
		if projection != nil {
			projectedItem, e := projection.Evaluate(nestItem, context)
			if e != nil {
				context.Error(errors.NewEvaluationError(e, "nest path"))
				return nil, false
			}

			if projectedItem.Type() == value.MISSING {
				continue
			}

			nv = value.NewAnnotatedValue(projectedItem)
			nv.SetAnnotations(nestItem)
		} else {
			nv = nestItem
		}

		nvs = append(nvs, nv)
	}

	return nvs, fetchOk
}

func (this *Join) processItem(item value.AnnotatedValue, context *Context) bool {
	kv, e := this.plan.Term().Keys().Evaluate(item, context)
	if e != nil {
		context.Error(errors.NewEvaluationError(e, "JOIN keys"))
		return false
	}

	actuals := kv.Actual()
	switch actuals.(type) {
	case []interface{}:
	case nil:
		actuals = []interface{}(nil)
	default:
		actuals = []interface{}{actuals}
	}

	acts := actuals.([]interface{})
	if len(acts) == 0 {
		// Outer join
		return !this.plan.Outer() || this.sendItem(item)
	}

	// Build list of keys
	keys := make([]string, 0, len(acts))
	for _, key := range acts {
		k := value.NewValue(key).Actual()
		switch k := k.(type) {
		case string:
			keys = append(keys, k)
		}
	}

	timer := time.Now()

	// Fetch
	pairs, errs := this.plan.Keyspace().Fetch(keys)

	this.duration += time.Since(timer)

	fetchOk := true
	for _, err := range errs {
		context.Error(err)
		if err.IsFatal() {
			fetchOk = false
		}
	}

	found := len(pairs) > 0

	// Attach and send
	for i, pair := range pairs {
		joinItem := pair.Value
		var jv value.AnnotatedValue

		// Apply projection, if any
		projection := this.plan.Term().Projection()
		if projection != nil {
			projectedItem, e := projection.Evaluate(joinItem, context)
			if e != nil {
				context.Error(errors.NewEvaluationError(e, "join path"))
				return false
			}

			jv = value.NewAnnotatedValue(projectedItem)
			jv.SetAnnotations(joinItem)
		} else {
			jv = joinItem
		}

		var av value.AnnotatedValue
		if i < len(pairs)-1 {
			av = value.NewAnnotatedValue(item.Copy())
		} else {
			av = item
		}

		av.SetField(this.plan.Term().Alias(), jv)

		if !this.sendItem(av) {
			return false
		}
	}

	return (found || !this.plan.Outer() || this.sendItem(item)) && fetchOk
}

func (this *Fetch) flushBatch(context *Context) bool {
	defer this.releaseBatch()

	if len(this.batch) == 0 {
		return true
	}

	keys := _STRING_POOL.Get()
	defer _STRING_POOL.Put(keys)

	batchMap := _STRING_ANNOTATED_POOL.Get()
	defer _STRING_ANNOTATED_POOL.Put(batchMap)

	for _, av := range this.batch {
		meta := av.GetAttachment("meta")

		switch meta := meta.(type) {
		case map[string]interface{}:
			key := meta["id"]
			act := value.NewValue(key).Actual()
			switch act := act.(type) {
			case string:
				keys = append(keys, act)
				batchMap[act] = av
			default:
				context.Error(errors.NewInvalidValueError(fmt.Sprintf(
					"Missing or invalid primary key %v of type %T.",
					act, act)))
				return false
			}
		default:
			context.Error(errors.NewInvalidValueError(
				"Missing or invalid meta for primary key."))
			return false
		}
	}

	timer := time.Now()

	// Fetch
	pairs, errs := this.plan.Keyspace().Fetch(keys)

	context.AddPhaseTime("fetch", time.Since(timer))

	fetchOk := true
	for _, err := range errs {
		context.Error(err)
		if err.IsFatal() {
			fetchOk = false
		}
	}

	fetchMap := _STRING_ANNOTATED_POOL.Get()
	defer _STRING_ANNOTATED_POOL.Put(fetchMap)

	// Attach meta
	for _, pair := range pairs {
		pv, ok := pair.Value.(value.AnnotatedValue)
		if !ok {
			context.Fatal(errors.NewInvalidValueError(fmt.Sprintf(
				"Invalid fetch value %v of type %T", pair.Value)))
			return false
		}

		var fv value.AnnotatedValue

		// Apply projection, if any
		projection := this.plan.Term().Projection()
		if projection != nil {
			projectedItem, e := projection.Evaluate(pv, context)
			if e != nil {
				context.Error(errors.NewEvaluationError(e, "fetch path"))
				return false
			}

			if projectedItem.Type() == value.MISSING {
				continue
			}

			fv = value.NewAnnotatedValue(projectedItem)
			fv.SetAnnotations(pv)
		} else {
			fv = pv
		}

		fetchMap[pair.Key] = fv
	}

	// Preserve order of keys
	for _, key := range keys {
		fv := fetchMap[key]
		if fv == nil {
			continue
		}

		item := batchMap[key]
		item.SetField(this.plan.Term().Alias(), fv)

		if !this.sendItem(item) {
			return false
//.........这里部分代码省略.........

func (this *Nest) processItem(item value.AnnotatedValue, context *Context) bool {
	kv, e := this.plan.Term().Keys().Evaluate(item, context)
	if e != nil {
		context.Error(errors.NewEvaluationError(e, "NEST keys"))
		return false
	}

	actuals := kv.Actual()
	switch actuals.(type) {
	case []interface{}:
	case nil:
		actuals = []interface{}(nil)
	default:
		actuals = []interface{}{actuals}
	}

	acts := actuals.([]interface{})
	if len(acts) == 0 {
		// Outer nest
		return !this.plan.Outer() || this.sendItem(item)
	}

	// Build list of keys
	keys := make([]string, 0, len(acts))
	for _, key := range acts {
		k := value.NewValue(key).Actual()
		switch k := k.(type) {
		case string:
			keys = append(keys, k)
		}
	}

	timer := time.Now()

	// Fetch
	pairs, errs := this.plan.Keyspace().Fetch(keys)

	this.duration += time.Since(timer)

	fetchOk := true
	for _, err := range errs {
		context.Error(err)
		if err.IsFatal() {
			fetchOk = false
		}
	}

	found := len(pairs) > 0

	if !found && !this.plan.Outer() {
		return true
	}

	nvs := make([]interface{}, 0, len(pairs))
	for _, pair := range pairs {
		nestItem := pair.Value
		var nv value.AnnotatedValue

		// Apply projection, if any
		projection := this.plan.Term().Projection()
		if projection != nil {
			projectedItem, e := projection.Evaluate(nestItem, context)
			if e != nil {
				context.Error(errors.NewEvaluationError(e, "nest path"))
				return false
			}

			if projectedItem.Type() == value.MISSING {
				continue
			}

			nv = value.NewAnnotatedValue(projectedItem)
			nv.SetAnnotations(nestItem)
		} else {
			nv = nestItem
		}

		nvs = append(nvs, nv)
	}

	// Attach and send
	item.SetField(this.plan.Term().Alias(), nvs)
	return this.sendItem(item) && fetchOk
}