github.com/TIBCOSoftware/flogo-lib@v0.5.9/core/mapper/exprmapper/ref/mappingref.go (about)

     1  package ref
     2  
     3  import (
     4  	"errors"
     5  	"strings"
     6  
     7  	"github.com/TIBCOSoftware/flogo-lib/core/data"
     8  	"github.com/TIBCOSoftware/flogo-lib/logger"
     9  )
    10  
    11  var log = logger.GetLogger("mapping-string")
    12  
    13  type MappingRef struct {
    14  	ref string
    15  }
    16  
    17  func NewMappingRef(ref string) *MappingRef {
    18  	//Compatible TriggerData, the $TriggerData might in function or expression
    19  	if strings.Index(ref, "$TriggerData") >= 0 {
    20  		ref = strings.Replace(ref, "$TriggerData", "$flow", -1)
    21  	}
    22  	return &MappingRef{ref: ref}
    23  }
    24  
    25  func (m *MappingRef) GetRef() string {
    26  	return m.ref
    27  }
    28  
    29  func (m *MappingRef) Eval(inputScope data.Scope, resovler data.Resolver) (interface{}, error) {
    30  	log.Debugf("Eval mapping field %s", m.ref)
    31  
    32  	if inputScope == nil {
    33  		return nil, errors.New("Input scope cannot nil while eval mapping ref")
    34  	}
    35  	value, err := m.GetValue(inputScope, resovler)
    36  	if err != nil {
    37  		log.Errorf("Get From from ref error %+v", err)
    38  	}
    39  
    40  	log.Debugf("Eval mapping field result: %+v", value)
    41  	return value, err
    42  
    43  }
    44  
    45  func (m *MappingRef) GetValue(inputScope data.Scope, resovler data.Resolver) (interface{}, error) {
    46  	return resovler.Resolve(m.ref, inputScope)
    47  }