07eb6311a8
this encoding scheme matches the one used by lucene it has been packaged separately so that others may more easily reuse it without using the rest of bleve
98 lines
2.5 KiB
Go
98 lines
2.5 KiB
Go
// Copyright (c) 2014 Couchbase, Inc.
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// Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file
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// except in compliance with the License. You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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// Unless required by applicable law or agreed to in writing, software distributed under the
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// License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
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// either express or implied. See the License for the specific language governing permissions
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// and limitations under the License.
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package numeric_util
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import (
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"reflect"
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"testing"
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)
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// these array encoding values have been verified manually
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// against the lucene imlementation
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func TestPrefixCoded(t *testing.T) {
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tests := []struct {
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input int64
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shift uint
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output PrefixCoded
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}{
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{
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input: 1,
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shift: 0,
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output: PrefixCoded{0x20, 0x1, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x1},
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},
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{
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input: -1,
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shift: 0,
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output: PrefixCoded{0x20, 0x0, 0x7f, 0x7f, 0x7f, 0x7f, 0x7f, 0x7f, 0x7f, 0x7f, 0x7f},
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},
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{
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input: -94582,
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shift: 0,
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output: PrefixCoded{0x20, 0x0, 0x7f, 0x7f, 0x7f, 0x7f, 0x7f, 0x7f, 0x7a, 0x1d, 0xa},
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},
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{
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input: 314729851,
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shift: 0,
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output: PrefixCoded{0x20, 0x1, 0x0, 0x0, 0x0, 0x0, 0x1, 0x16, 0x9, 0x4a, 0x7b},
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},
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{
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input: 314729851,
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shift: 4,
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output: PrefixCoded{0x24, 0x8, 0x0, 0x0, 0x0, 0x0, 0x9, 0x30, 0x4c, 0x57},
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},
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{
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input: 314729851,
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shift: 8,
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output: PrefixCoded{0x28, 0x40, 0x0, 0x0, 0x0, 0x0, 0x4b, 0x4, 0x65},
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},
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{
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input: 314729851,
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shift: 16,
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output: PrefixCoded{0x30, 0x20, 0x0, 0x0, 0x0, 0x0, 0x25, 0x42},
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},
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{
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input: 314729851,
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shift: 32,
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output: PrefixCoded{0x40, 0x8, 0x0, 0x0, 0x0, 0x0},
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},
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{
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input: 1234729851,
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shift: 32,
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output: PrefixCoded{0x40, 0x8, 0x0, 0x0, 0x0, 0x0},
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},
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}
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for _, test := range tests {
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actual, err := NewPrefixCodedInt64(test.input, test.shift)
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if err != nil {
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t.Error(err)
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}
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if !reflect.DeepEqual(actual, test.output) {
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t.Errorf("expected %#v, got %#v", test.output, actual)
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}
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checkedShift, err := actual.Shift()
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if err != nil {
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t.Error(err)
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}
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if checkedShift != test.shift {
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t.Errorf("expected %d, got %d", test.shift, checkedShift)
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}
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// if the shift was 0, make sure we can go back to the original
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if test.shift == 0 {
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backToLong, err := actual.Int64()
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if err != nil {
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t.Error(err)
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}
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if backToLong != test.input {
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t.Errorf("expected %v, got %v", test.input, backToLong)
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}
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}
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}
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}
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