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// Copyright (c) 2014 Couchbase, Inc.
//
// 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 numeric
import (
"reflect"
"testing"
)
var tests = []struct {
input int64
shift uint
output PrefixCoded
}{
{
input: 1,
shift: 0,
output: PrefixCoded{0x20, 0x1, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x1},
},
{
input: -1,
shift: 0,
output: PrefixCoded{0x20, 0x0, 0x7f, 0x7f, 0x7f, 0x7f, 0x7f, 0x7f, 0x7f, 0x7f, 0x7f},
},
{
input: -94582,
shift: 0,
output: PrefixCoded{0x20, 0x0, 0x7f, 0x7f, 0x7f, 0x7f, 0x7f, 0x7f, 0x7a, 0x1d, 0xa},
},
{
input: 314729851,
shift: 0,
output: PrefixCoded{0x20, 0x1, 0x0, 0x0, 0x0, 0x0, 0x1, 0x16, 0x9, 0x4a, 0x7b},
},
{
input: 314729851,
shift: 4,
output: PrefixCoded{0x24, 0x8, 0x0, 0x0, 0x0, 0x0, 0x9, 0x30, 0x4c, 0x57},
},
{
input: 314729851,
shift: 8,
output: PrefixCoded{0x28, 0x40, 0x0, 0x0, 0x0, 0x0, 0x4b, 0x4, 0x65},
},
{
input: 314729851,
shift: 16,
output: PrefixCoded{0x30, 0x20, 0x0, 0x0, 0x0, 0x0, 0x25, 0x42},
},
{
input: 314729851,
shift: 32,
output: PrefixCoded{0x40, 0x8, 0x0, 0x0, 0x0, 0x0},
},
{
input: 1234729851,
shift: 32,
output: PrefixCoded{0x40, 0x8, 0x0, 0x0, 0x0, 0x0},
},
}
// these array encoding values have been verified manually
// against the lucene implementation
func TestPrefixCoded(t *testing.T) {
for _, test := range tests {
actual, err := NewPrefixCodedInt64(test.input, test.shift)
if err != nil {
t.Error(err)
}
if !reflect.DeepEqual(actual, test.output) {
t.Errorf("expected %#v, got %#v", test.output, actual)
}
checkedShift, err := actual.Shift()
if err != nil {
t.Error(err)
}
if checkedShift != test.shift {
t.Errorf("expected %d, got %d", test.shift, checkedShift)
}
// if the shift was 0, make sure we can go back to the original
if test.shift == 0 {
backToLong, err := actual.Int64()
if err != nil {
t.Error(err)
}
if backToLong != test.input {
t.Errorf("expected %v, got %v", test.input, backToLong)
}
}
}
}
func TestPrefixCodedValid(t *testing.T) {
// all of the shared tests should be valid
for _, test := range tests {
valid, _ := ValidPrefixCodedTerm(string(test.output))
if !valid {
t.Errorf("expected %s to be valid prefix coded, is not", string(test.output))
}
}
invalidTests := []struct {
data PrefixCoded
}{
// first byte invalid skip (too low)
{
data: PrefixCoded{0x19, 'c', 'a', 't'},
},
// first byte invalid skip (too high)
{
data: PrefixCoded{0x20 + 64, 'c'},
},
// length of trailing bytes wrong (too long)
{
data: PrefixCoded{0x20, 0x1, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x1},
},
// length of trailing bytes wrong (too short)
{
data: PrefixCoded{0x20 + 63},
},
}
// all of the shared tests should be valid
for _, test := range invalidTests {
valid, _ := ValidPrefixCodedTerm(string(test.data))
if valid {
t.Errorf("expected %s to be invalid prefix coded, it is", string(test.data))
}
}
}
func BenchmarkTestPrefixCoded(b *testing.B) {
for i := 0; i < b.N; i++ {
for _, test := range tests {
actual, err := NewPrefixCodedInt64(test.input, test.shift)
if err != nil {
b.Error(err)
}
if !reflect.DeepEqual(actual, test.output) {
b.Errorf("expected %#v, got %#v", test.output, actual)
}
}
}
}
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