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compare.go
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compare.go
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/*
* Copyright 2017-2018 Dgraph Labs, Inc. and Contributors
*
* Licensed 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 types
import "github.com/dgraph-io/dgraph/x"
// CompareVals compares two values using the given comparison type.
// Should be used only in filtering arg1 by comparing with arg2.
// arg2 is reference Val to which arg1 is compared.
func CompareVals(op string, arg1, arg2 Val) bool {
negateRes := func(b bool, e error) (bool, error) { // reverses result
return !b, e
}
noError := func(b bool, e error) bool {
return b && e == nil
}
switch op {
case "ge":
return noError(negateRes(Less(arg1, arg2)))
case "gt":
return noError(Less(arg2, arg1))
case "le":
return noError(negateRes(Less(arg2, arg1)))
case "lt":
return noError(Less(arg1, arg2))
case "eq":
return noError(Equal(arg1, arg2))
default:
// should have been checked at query level.
x.Fatalf("Unknown ineqType %v", op)
}
return false
}
// CompareBetween compares if the dst value lie between
// two values val1 and val2(both inclusive).
func CompareBetween(dst, val1, val2 Val) bool {
return CompareVals("ge", dst, val1) &&
CompareVals("le", dst, val2)
}