Golang Value.MarshalJSON方法代碼示例

// CreatePrimaryIndex implements datastore.Indexer{} interface. Create or
// return a primary index on this keyspace
func (gsi *gsiKeyspace) CreatePrimaryIndex(
	requestId, name string, with value.Value) (datastore.PrimaryIndex, errors.Error) {

	var withJSON []byte
	var err error
	if with != nil {
		if withJSON, err = with.MarshalJSON(); err != nil {
			return nil, errors.NewError(err, "GSI error marshalling WITH clause")
		}
	}
	defnID, err := gsi.gsiClient.CreateIndex(
		name,
		gsi.keyspace,       /*bucket-name*/
		string(c.ForestDB), /*using, by default always forestdb*/
		"N1QL",             /*exprType*/
		"",                 /*partnStr*/
		"",                 /*whereStr*/
		nil,                /*secStrs*/
		true,               /*isPrimary*/
		withJSON)
	if err != nil {
		return nil, errors.NewError(err, "GSI CreatePrimaryIndex()")
	}
	// refresh to get back the newly created index.
	if err := gsi.Refresh(); err != nil {
		return nil, err
	}
	index, errr := gsi.IndexById(defnID2String(defnID))
	if errr != nil {
		return nil, errr
	}
	return index.(datastore.PrimaryIndex), nil
}

func (this *Base64) Apply(context Context, operand value.Value) (value.Value, error) {
	if operand.Type() == value.MISSING {
		return operand, nil
	}

	bytes, _ := operand.MarshalJSON() // Ignore errors from BINARY values
	str := base64.StdEncoding.EncodeToString(bytes)
	return value.NewValue(str), nil
}

// CreateIndex implements datastore.Indexer{} interface. Create a secondary
// index on this keyspace
func (gsi *gsiKeyspace) CreateIndex(
	requestId, name string, seekKey, rangeKey expression.Expressions,
	where expression.Expression, with value.Value) (
	datastore.Index, errors.Error) {

	var partnStr string
	if seekKey != nil && len(seekKey) > 0 {
		partnStr = expression.NewStringer().Visit(seekKey[0])
	}

	var whereStr string
	if where != nil {
		whereStr = expression.NewStringer().Visit(where)
	}

	secStrs := make([]string, len(rangeKey))
	for i, key := range rangeKey {
		s := expression.NewStringer().Visit(key)
		secStrs[i] = s
	}

	var withJSON []byte
	var err error
	if with != nil {
		if withJSON, err = with.MarshalJSON(); err != nil {
			return nil, errors.NewError(err, "GSI error marshalling WITH clause")
		}
	}
	defnID, err := gsi.gsiClient.CreateIndex(
		name,
		gsi.keyspace,       /*bucket-name*/
		string(c.ForestDB), /*using, by default always forestdb*/
		"N1QL",             /*exprType*/
		partnStr, whereStr, secStrs,
		false, /*isPrimary*/
		withJSON)
	if err != nil {
		return nil, errors.NewError(err, "GSI CreateIndex()")
	}
	// refresh to get back the newly created index.
	if err := gsi.Refresh(); err != nil {
		return nil, err
	}
	return gsi.IndexById(defnID2String(defnID))
}

func doGetPrepared(prepared_stmt value.Value, track bool) (*Prepared, errors.Error) {
	switch prepared_stmt.Type() {
	case value.STRING:
		prepared := cache.get(prepared_stmt, track)
		if prepared == nil {
			return nil, errors.NewNoSuchPreparedError(prepared_stmt.Actual().(string))
		}
		return prepared, nil
	case value.OBJECT:
		name_value, has_name := prepared_stmt.Field("name")
		if has_name {
			if prepared := cache.get(name_value, track); prepared != nil {
				return prepared, nil
			}
		}
		prepared_bytes, err := prepared_stmt.MarshalJSON()
		if err != nil {
			return nil, errors.NewUnrecognizedPreparedError(err)
		}
		return unmarshalPrepared(prepared_bytes)
	default:
		return nil, errors.NewUnrecognizedPreparedError(fmt.Errorf("Invalid prepared stmt %v", prepared_stmt))
	}
}

/*
This method returns a number value that represents the length of the bytes slice
returned by the MarshalJSON method cast to a float64 value.
*/
func (this *EncodedSize) Apply(context Context, arg value.Value) (value.Value, error) {
	bytes, _ := arg.MarshalJSON()
	return value.NewValue(float64(len(bytes))), nil
}