tech.pronghorn.util.finder.FinderGenerator.kt Maven / Gradle / Ivy

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A low-level, high performance HTTP server.

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/*
 * Copyright 2017 Pronghorn Technology LLC
 *
 * 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 tech.pronghorn.util.finder

object FinderGenerator {
    fun  generateFinder(toLookup: Array): ByteBackedFinder {
        val byBytes = toLookup.map(ByteBacked::bytes)
        val groupedBySize = byBytes.groupBy { bytes -> bytes.size }
        val maxOfOneLength = groupedBySize.values.map { list -> list.size }.max() ?: 0

        return when {
            byBytes.size < 4 -> SequentialFinder(toLookup)
            maxOfOneLength < 5 -> LengthPartitionedFinder(toLookup)
            else -> DifferentiatedFinder(toLookup)
        }
    }
}