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referenceNode.go
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referenceNode.go
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package query
import (
"bytes"
"encoding/gob"
"log"
"strings"
)
type ReferenceNodeI interface {
NodeI
Aliaser
conditioner
nodeLinkI
Expander
}
// A ReferenceNode is a forward-pointing foreign key relationship, and can define a one-to-one or
// one-to-many relationship, depending on whether it is unique. If the other side of the relationship is
// not a type table, then the other table will have a matching ReverseReferenceNode.
type ReferenceNode struct {
nodeAlias
nodeCondition
nodeLink
// Which database in the global list of databases does the node belong to
dbKey string
// Name of table in the database we point to
dbTable string
// The name of the table that is the foreign key
dbColumn string
// The name of the table related to this reference
goColumnName string
// The name of the function used to access the property as a node or ORM item
goPropName string
// The name of the variable in the model structure used to hold the object
goVarName string
// The name of the table we are joining to
refTable string
// If a forward reference and NoSQL, the name of the table that will contain the reference or references backwards to us. If SQL, the Pk of the RefTable
refColumn string
// Is this pointing to a type table item?
isTypeTable bool
// The type of item acting as a pointer. This should be the same on both sides of the reference.
goType GoColumnType
}
// NewReferenceNode creates a forward reference node.
func NewReferenceNode(
dbKey string,
dbTableName string,
dbColumnName string,
goColumnName string,
goName string,
refTableName string,
refColumn string, // only used in NoSQL situation
isType bool,
goType GoColumnType,
) *ReferenceNode {
n := &ReferenceNode{
dbKey: dbKey,
dbTable: dbTableName,
dbColumn: dbColumnName,
goColumnName: goColumnName,
goPropName: goName,
refTable: refTableName,
refColumn: refColumn,
isTypeTable: isType,
goType: goType,
}
return n
}
func (n *ReferenceNode) copy() NodeI {
ret := &ReferenceNode{
dbKey: n.dbKey,
dbTable: n.dbTable,
dbColumn: n.dbColumn,
goColumnName: n.goColumnName,
goPropName: n.goPropName,
refTable: n.refTable,
refColumn: n.refColumn,
isTypeTable: n.isTypeTable,
goType: n.goType,
nodeAlias: nodeAlias{n.alias},
nodeCondition: nodeCondition{n.condition},
}
return ret
}
// Equals is used internally by the framework to determine if two nodes are equal.
func (n *ReferenceNode) Equals(n2 NodeI) bool {
if tn, ok := n2.(TableNodeI); !ok {
return false
} else if cn, ok := tn.EmbeddedNode_().(*ReferenceNode); !ok {
return false
} else {
return cn.dbTable == n.dbTable &&
cn.goPropName == n.goPropName &&
(cn.alias == "" || n.alias == "" || cn.alias == n.alias)
}
}
func (n *ReferenceNode) nodeType() NodeType {
return ReferenceNodeType
}
func (n *ReferenceNode) tableName() string {
return n.refTable
}
func (n *ReferenceNode) databaseKey() string {
return n.dbKey
}
func (n *ReferenceNode) log(level int) {
tabs := strings.Repeat("\t", level)
log.Print(tabs + "R: " + n.dbTable + "." + n.dbColumn + "." + n.refTable + " AS " + n.GetAlias())
}
// Return the name as a capitalized object name
func (n *ReferenceNode) goName() string {
return n.goPropName
}
// Return a column node for the foreign key that represents the reference to the other table
func (n *ReferenceNode) relatedColumnNode() *ColumnNode {
n2 := NewColumnNode(n.dbKey, n.dbTable, n.dbColumn, n.goColumnName, n.goType, false)
SetParentNode(n2, n.getParent())
return n2
}
func (n *ReferenceNode) Expand() {
panic("you cannot expand on a reference node, only reverse reference and many-many reference")
}
func (n *ReferenceNode) isExpanded() bool {
return false
}
func (n *ReferenceNode) isExpander() bool {
return false
}
type referenceNodeEncoded struct {
Alias string
Condition NodeI
Parent NodeI
DbKey string
DbTable string
DbColumn string
GoColumnName string
GoPropName string
GoVarName string
RefTable string
RefColumn string
IsTypeTable bool
GoType GoColumnType
}
func (n *ReferenceNode) GobEncode() (data []byte, err error) {
var buf bytes.Buffer
e := gob.NewEncoder(&buf)
s := referenceNodeEncoded{
Alias: n.alias,
Condition: n.condition,
Parent: n.parentNode,
DbKey: n.dbKey,
DbTable: n.dbTable,
DbColumn: n.dbColumn,
GoColumnName: n.goColumnName,
GoPropName: n.goPropName,
GoVarName: n.goVarName,
RefTable: n.refTable,
RefColumn: n.refColumn,
IsTypeTable: n.isTypeTable,
GoType:n.goType,
}
if err = e.Encode(s); err != nil {
panic(err)
}
data = buf.Bytes()
return
}
func (n *ReferenceNode) GobDecode(data []byte) (err error) {
buf := bytes.NewBuffer(data)
dec := gob.NewDecoder(buf)
var s referenceNodeEncoded
if err = dec.Decode(&s); err != nil {
panic(err)
}
n.alias = s.Alias
n.condition = s.Condition
n.dbKey = s.DbKey
n.dbTable = s.DbTable
n.dbColumn = s.DbColumn
n.goColumnName = s.GoColumnName
n.goPropName = s.GoPropName
n.goVarName = s.GoVarName
n.refTable = s.RefTable
n.refColumn = s.RefColumn
n.isTypeTable = s.IsTypeTable
n.goType = s.GoType
SetParentNode(n, s.Parent)
return
}
func init() {
gob.Register(&ReferenceNode{})
}
// RelatedColumnNode is used internally by the framework to create a new node for the other side of the relationship.
func RelatedColumnNode(n NodeI) NodeI {
if tn, _ := n.(TableNodeI); tn != nil {
if rn, _ := tn.EmbeddedNode_().(*ReferenceNode); rn != nil {
return rn.relatedColumnNode()
}
}
return nil
}
// ReferenceNodeRefTable is used internally by the framework to get the table name for the other side of the relationship.
func ReferenceNodeRefTable(n *ReferenceNode) string {
return n.refTable
}
// ReferenceNodeRefColumn is used internally by the framework to get the column name for the other side of the relationship.
func ReferenceNodeRefColumn(n *ReferenceNode) string {
return n.refColumn
}
// ReferenceNodeDbColumnName is used internally by the framework to get the column name for this side of the relationship.
func ReferenceNodeDbColumnName(n *ReferenceNode) string {
return n.dbColumn
}