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package mapr
import (
"strconv"
"github.com/mimecast/dtail/internal/io/dlog"
)
// WhereClause interprets the where clause of the mapreduce query.
func (q *Query) WhereClause(fields map[string]string) bool {
for _, wc := range q.Where {
if wc.Operation > FloatOperation {
if !whereClauseFloatValues(fields, wc) {
return false
}
continue
}
if !whereClauseStringValues(fields, wc) {
return false
}
}
return true
}
func whereClauseFloatValues(fields map[string]string, wc whereCondition) bool {
var lValue, rValue float64
var ok bool
if lValue, ok = whereClauseFloatValue(fields, wc.lString, wc.lFloat, wc.lType); !ok {
return false
}
if rValue, ok = whereClauseFloatValue(fields, wc.rString, wc.rFloat, wc.rType); !ok {
return false
}
if ok = wc.floatClause(lValue, rValue); !ok {
return false
}
return true
}
func whereClauseFloatValue(fields map[string]string, str string, float float64,
t fieldType) (float64, bool) {
switch t {
case Float:
return float, true
case Field:
value, ok := fields[str]
if !ok {
return 0, false
}
f, err := strconv.ParseFloat(value, 64)
if err != nil {
return 0, false
}
return f, true
default:
dlog.Common.Error("Unexpected argument in 'where' clause", str, float, t)
return 0, false
}
}
func whereClauseStringValues(fields map[string]string, wc whereCondition) bool {
var lValue, rValue string
var ok bool
if lValue, ok = whereClauseStringValue(fields, wc.lString, wc.lType); !ok {
return false
}
if rValue, ok = whereClauseStringValue(fields, wc.rString, wc.rType); !ok {
return false
}
if ok = wc.stringClause(lValue, rValue); !ok {
return false
}
return true
}
func whereClauseStringValue(fields map[string]string, str string,
t fieldType) (string, bool) {
switch t {
case Field:
value, ok := fields[str]
if !ok {
return str, false
}
return value, true
case String:
return str, true
default:
dlog.Common.Error("Unexpected argument in 'where' clause", str, t)
return str, false
}
}
|
