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homeobj.go
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homeobj.go
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// homeobj.go
package main
import (
"database/sql"
"errors"
"fmt"
"strconv"
"github.com/golang/glog"
)
// -----------------------------------------------
type TDataType int
const (
DBTypeNone TDataType = iota
DBTypeBool
DBTypeInt
DBTypeFloat
DBTypeText
DBTypeDateTime
)
// -----------------------------------------------
type HomeObject struct {
Fields []ItemField
Values []ItemFieldVal
linkedObjs []HomeObject
}
// getId : return objectId if exist or -1
func (obj HomeObject) getId() int {
if len(obj.Values) <= 0 {
glog.Error("Error trying to get Id from an HomeObject with empty []Values")
return -1
}
return obj.Values[0].IdObject
}
// hasField : return true if fieldName is present
func (obj HomeObject) hasField(fieldName string) bool {
for _, v := range obj.Fields {
if v.Name == fieldName {
return true
}
}
return false
}
// getFieldIndex : return field index of fieldName if present else -1
func (obj HomeObject) getFieldIndex(fieldName string) (int, error) {
for i, v := range obj.Fields {
if v.Name == fieldName {
return i, nil
}
}
err := errors.New(fmt.Sprintf("Field '%s' not found", fieldName))
glog.Error(err)
if glog.V(1) {
glog.Info(obj)
}
return -1, err
}
// getIntVal : return integer value for fieldName if possible else err
func (obj HomeObject) getIntVal(fieldName string) (value int, err error) {
idx, err := obj.getFieldIndex(fieldName)
if err != nil {
return
}
if len(obj.Values) < idx {
err = errors.New(fmt.Sprintf("No value for '%s' field", fieldName))
} else {
switch obj.Fields[idx].IdDataType {
case DBTypeBool, DBTypeInt, DBTypeDateTime, DBTypeText:
value, err = strconv.Atoi(obj.Values[idx].Val)
case DBTypeFloat:
err = errors.New(fmt.Sprintf("Not converting float to int for '%s' field", fieldName))
default:
err = errors.New(fmt.Sprintf("Unknown data type %d for '%s' field", obj.Fields[idx].IdDataType, fieldName))
}
}
if err != nil {
glog.Error(err)
if glog.V(1) {
glog.Info(obj)
}
}
return
}
// getStrVal : return string value for fieldName if possible else err
func (obj HomeObject) getStrVal(fieldName string) (value string, err error) {
idx, err := obj.getFieldIndex(fieldName)
if err != nil {
return
}
if len(obj.Values) < idx {
err = errors.New(fmt.Sprintf("No value for '%s' field", fieldName))
} else {
switch obj.Fields[idx].IdDataType {
case DBTypeBool:
if obj.Values[idx].Val == "0" {
value = "No"
} else {
value = "Yes"
}
case DBTypeInt, DBTypeDateTime, DBTypeFloat:
value = fmt.Sprint(obj.Values[idx].Val)
case DBTypeText:
value = obj.Values[idx].Val
default:
err = errors.New(fmt.Sprintf("Unknown data type %d for '%s' field", obj.Fields[idx].IdDataType, fieldName))
}
}
if err != nil {
glog.Error(err)
if glog.V(1) {
glog.Info(obj)
}
}
return
}
// ValidateValues : check values are valid regarding obj.Fields
// TODO HomeObject.ValidateValues
func (obj HomeObject) ValidateValues(values []ItemFieldVal) (err error) {
return
}
// -----------------------------------------------
// getLinkedObjects add to each objs[] corresponding linked objects
// todo : reorg/optimisation : currently need 1 db query for each objs[] + 1 db query for each linked obj
func getLinkedObjects(db *sql.DB, objs []HomeObject) (err error) {
if db == nil {
if db, err = openDB(); err != nil {
return
}
defer db.Close()
}
for i := range objs {
lstLinkedObjId, err := getLinkedObjIds(db, objs[i].getId())
if err != nil {
return err
}
for _, linkedObjId := range lstLinkedObjId {
linkedObjs, err := getHomeObjects(db, ItemIdNone, linkedObjId)
if err != nil {
return err
}
if glog.V(2) {
glog.Infof("Add linkedObj %d to masterObj %d", linkedObjs[0].getId(), objs[i].getId())
}
objs[i].linkedObjs = append(objs[i].linkedObjs, linkedObjs[0])
}
}
return
}
// getHomeObjects : read objects
// If idObject > 0 return object with Id = idObject
// Else if idItem > 0 return all objects for Item definition idItem
// Else Return all objects for ItemType idItemType
func getHomeObjects(db *sql.DB, idItem TItemId, idObject int) (objs []HomeObject, err error) {
if db == nil {
if db, err = openDB(); err != nil {
return
}
defer db.Close()
}
if idItem > 0 || idObject > 0 {
var curObj HomeObject
// read fields
curObj.Fields, err = getItemFields(db, idItem, idObject)
if err != nil {
return
}
// read values
values, err1 := getItemFieldValues(db, idItem, idObject)
if err1 != nil {
err = err1
return
}
// build objs[] and assign values[] to each HomeObject instance
if len(values) > 0 {
startIdx := 0
curIdObject := values[startIdx].IdObject
for i, v := range values {
if v.IdObject == curIdObject {
continue
}
curObj.Values = values[startIdx:i]
objs = append(objs, curObj)
startIdx = i
curIdObject = values[startIdx].IdObject
}
curObj.Values = values[startIdx:]
objs = append(objs, curObj)
}
// Read linkedObjs
if getLinkedObjects(db, objs) != nil {
return
}
} else {
items, err1 := getManageItems(db, ItemIdNone)
if err1 != nil {
err = err1
return
}
// for each item, read objects
for _, item := range items {
lstObjs, err1 := getHomeObjects(db, item.IdItem, -1)
if err1 != nil {
err = err1
return
}
for _, obj := range lstObjs {
objs = append(objs, obj)
}
}
}
return
}
// writeObject : save object to db
func writeObject(obj HomeObject) (objectid int, err error) {
objectid, err = writeItemFieldValues(nil, obj.Values)
return
}