kll/sketch_structure.go

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 kll

type sketchStructure struct {
	preInts int
	serVer  int
}

var (
	_COMPACT_EMPTY  = sketchStructure{_PREAMBLE_INTS_EMPTY_SINGLE, _SERIAL_VERSION_EMPTY_FULL}
	_COMPACT_SINGLE = sketchStructure{_PREAMBLE_INTS_EMPTY_SINGLE, _SERIAL_VERSION_SINGLE}
	_COMPACT_FULL   = sketchStructure{_PREAMBLE_INTS_FULL, _SERIAL_VERSION_EMPTY_FULL}
	_UPDATABLE      = sketchStructure{_PREAMBLE_INTS_FULL, _SERIAL_VERSION_UPDATABLE}
)

func (s sketchStructure) getPreInts() int { return s.preInts }

func (s sketchStructure) getSerVer() int { return s.serVer }

func getSketchStructure(preInts, serVer int) sketchStructure {
	if preInts == _PREAMBLE_INTS_EMPTY_SINGLE {
		if serVer == _SERIAL_VERSION_EMPTY_FULL {
			return _COMPACT_EMPTY
		} else if serVer == _SERIAL_VERSION_SINGLE {
			return _COMPACT_SINGLE
		}
	} else if preInts == _PREAMBLE_INTS_FULL {
		if serVer == _SERIAL_VERSION_EMPTY_FULL {
			return _COMPACT_FULL
		} else if serVer == _SERIAL_VERSION_UPDATABLE {
			return _UPDATABLE
		}
	}
	panic("Invalid preamble ints and serial version combo")
}