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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package age
import (
"fmt"
"reflect"
"strings"
"github.com/antlr/antlr4/runtime/Go/antlr/v4"
"github.com/apache/age/drivers/golang/parser"
)
type AGMapper struct {
AGUnmarshaler
}
func NewAGMapper(typeMap map[string]reflect.Type) *AGMapper {
vcache := make(map[int64]interface{})
if typeMap == nil {
typeMap = make(map[string]reflect.Type)
}
m := AGUnmarshaler{ageParser: parser.NewAgeParser(nil),
visitor: &MapperVisitor{UnmarshalVisitor: UnmarshalVisitor{vcache: vcache},
typeMap: typeMap},
errListener: NewAGErrorListener(),
vcache: vcache,
}
agm := &AGMapper{AGUnmarshaler: m}
agm.ageParser.AddErrorListener(agm.errListener)
return agm
}
func (m *AGMapper) PutType(label string, tp reflect.Type) {
m.visitor.(*MapperVisitor).PutType(label, tp)
}
type MapperVisitor struct {
UnmarshalVisitor
typeMap map[string]reflect.Type
}
func (v *MapperVisitor) PutType(label string, tp reflect.Type) {
v.typeMap[label] = tp
}
func (v *MapperVisitor) VisitAgeout(ctx *parser.AgeoutContext) interface{} {
rtn := v.VisitChildren(ctx)
return rtn
}
func (v *MapperVisitor) VisitChildren(node antlr.RuleNode) interface{} {
var rtn interface{}
for _, c := range node.GetChildren() {
pt := c.(antlr.ParseTree)
rtn = pt.Accept(v)
}
return rtn
}
func (v *MapperVisitor) VisitPath(ctx *parser.PathContext) interface{} {
entities := []interface{}{}
for _, child := range ctx.GetChildren() {
switch child.(type) {
case *parser.VertexContext:
v := child.(*parser.VertexContext).Accept(v)
// fmt.Println(v)
entities = append(entities, v)
case *parser.EdgeContext:
e := child.(*parser.EdgeContext).Accept(v)
// fmt.Println(e)
entities = append(entities, e)
default:
}
}
// vctxArr := ctx.AllVertex()
// start := vctxArr[0].Accept(v)
// rel := ctx.Edge().Accept(v)
// end := vctxArr[1].Accept(v)
// fmt.Println("VisitPath:", reflect.TypeOf(start), reflect.TypeOf(rel), reflect.TypeOf(rel))
path := NewMapPath(entities)
return path
}
func (v *MapperVisitor) VisitVertex(ctx *parser.VertexContext) interface{} {
propCtx := ctx.Properties()
props := propCtx.Accept(v).(map[string]interface{})
vid := int64(props["id"].(int64))
vertex, ok := v.vcache[vid]
var err error
if !ok {
vertex, err = v.mapVertex(vid, props["label"].(string), props["properties"].(map[string]interface{}))
if err != nil {
panic(err)
}
v.vcache[vid] = vertex
}
// fmt.Println(" * VisitVertex:", vertex)
return vertex
}
// Visit a parse tree produced by AgeParser#edge.
func (v *MapperVisitor) VisitEdge(ctx *parser.EdgeContext) interface{} {
propCtx := ctx.Properties()
props := propCtx.Accept(v).(map[string]interface{})
vid := props["id"].(int64)
edge, ok := v.vcache[vid]
var err error
if !ok {
edge, err = v.mapEdge(vid, props["label"].(string), props["start_id"].(int64), props["end_id"].(int64),
props["properties"].(map[string]interface{}))
if err != nil {
panic(err)
}
v.vcache[vid] = edge
}
return edge
}
func (v *MapperVisitor) mapVertex(vid int64, label string, properties map[string]interface{}) (interface{}, error) {
tp, ok := v.typeMap[label]
if !ok {
return NewVertex(vid, label, properties), nil
}
return mapStruct(tp, properties)
}
func (v *MapperVisitor) mapEdge(vid int64, label string, start int64, end int64, properties map[string]interface{}) (interface{}, error) {
tp, ok := v.typeMap[label]
if !ok {
return NewEdge(vid, label, start, end, properties), nil
}
return mapStruct(tp, properties)
}
func mapStruct(tp reflect.Type, properties map[string]interface{}) (interface{}, error) {
value := reflect.New(tp).Elem()
for k, v := range properties {
k = strings.Title(k)
f, ok := tp.FieldByName(k)
if ok {
field := value.FieldByIndex(f.Index)
val := reflect.ValueOf(v)
if field.Type().ConvertibleTo(val.Type()) {
field.Set(val)
} else {
return nil, fmt.Errorf("Property[%s] value[%v] type is not convertable to %v", k, v, field.Type())
}
}
}
return value.Interface(), nil
}
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