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Move common collectors to new utility class

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David Kaspar
2025-08-16 10:07:04 +01:00
parent e867571ea6
commit c4b71a0aea
1 changed files with 359 additions and 0 deletions
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quartz/src/main/java/com/vitorpamplona/quartz/utils/CacheCollectors.kt Normal file
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/**
* Copyright (c) 2025 Vitor Pamplona
*
* Permission is hereby granted, free of charge, to any person obtaining a copy of
* this software and associated documentation files (the "Software"), to deal in
* the Software without restriction, including without limitation the rights to use,
* copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the
* Software, and to permit persons to whom the Software is furnished to do so,
* subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
* AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
package com.vitorpamplona.quartz.utils
import java.util.function.BiConsumer
object CacheCollectors {
fun interface BiFilter<K, V> {
fun filter(
k: K,
v: V,
): Boolean
}
class BiFilterCollector<K, V>(
val filter: BiFilter<K, V>,
) : BiConsumer<K, V> {
var results: ArrayList<V> = ArrayList()
override fun accept(
k: K,
v: V,
) {
if (filter.filter(k, v)) {
results.add(v)
}
}
}
class BiFilterUniqueCollector<K, V>(
val filter: BiFilter<K, V>,
) : BiConsumer<K, V> {
var results: HashSet<V> = HashSet()
override fun accept(
k: K,
v: V,
) {
if (filter.filter(k, v)) {
results.add(v)
}
}
}
fun interface BiMapper<K, V, R> {
fun map(
k: K,
v: V,
): R?
}
fun interface BiMapperNotNull<K, V, R> {
fun map(
k: K,
v: V,
): R
}
class BiMapCollector<K, V, R>(
val mapper: BiMapper<K, V, R?>,
) : BiConsumer<K, V> {
var results: ArrayList<R> = ArrayList()
override fun accept(
k: K,
v: V,
) {
val result = mapper.map(k, v)
if (result != null) {
results.add(result)
}
}
}
class BiAssociateCollector<K, V, T, U>(
val size: Int,
val mapper: BiMapperNotNull<K, V, Pair<T, U>>,
) : BiConsumer<K, V> {
var results: LinkedHashMap<T, U> = LinkedHashMap(size)
override fun accept(
k: K,
v: V,
) {
val pair = mapper.map(k, v)
results.put(pair.first, pair.second)
}
}
class BiAssociateNotNullCollector<K, V, T, U>(
val size: Int,
val mapper: BiMapper<K, V, Pair<T, U>?>,
) : BiConsumer<K, V> {
var results: LinkedHashMap<T, U> = LinkedHashMap(size)
override fun accept(
k: K,
v: V,
) {
val pair = mapper.map(k, v)
if (pair != null) {
results.put(pair.first, pair.second)
}
}
}
class BiAssociateWithCollector<K, V, U>(
val size: Int,
val mapper: BiMapper<K, V, U?>,
) : BiConsumer<K, V> {
var results: LinkedHashMap<K, U?> = LinkedHashMap(size)
override fun accept(
k: K,
v: V,
) {
results.put(k, mapper.map(k, v))
}
}
class BiAssociateNotNullWithCollector<K, V, U>(
val size: Int,
val mapper: BiMapper<K, V, U>,
) : BiConsumer<K, V> {
var results: LinkedHashMap<K, U> = LinkedHashMap(size)
override fun accept(
k: K,
v: V,
) {
val newValue = mapper.map(k, v)
if (newValue != null) {
results.put(k, newValue)
}
}
}
class BiMapUniqueCollector<K, V, R>(
val mapper: BiMapper<K, V, R?>,
) : BiConsumer<K, V> {
var results: HashSet<R> = HashSet()
override fun accept(
k: K,
v: V,
) {
val result = mapper.map(k, v)
if (result != null) {
results.add(result)
}
}
}
class BiMapFlattenCollector<K, V, R>(
val mapper: BiMapper<K, V, Collection<R>?>,
) : BiConsumer<K, V> {
var results: ArrayList<R> = ArrayList()
override fun accept(
k: K,
v: V,
) {
val result = mapper.map(k, v)
if (result != null) {
results.addAll(result)
}
}
}
class BiMapFlattenUniqueCollector<K, V, R>(
val mapper: BiMapper<K, V, Collection<R>?>,
) : BiConsumer<K, V> {
var results: HashSet<R> = HashSet()
override fun accept(
k: K,
v: V,
) {
val result = mapper.map(k, v)
if (result != null) {
results.addAll(result)
}
}
}
fun interface BiNotNullMapper<K, V, R> {
fun map(
k: K,
v: V,
): R
}
class BiNotNullMapCollector<K, V, R>(
val mapper: BiNotNullMapper<K, V, R>,
) : BiConsumer<K, V> {
var results: ArrayList<R> = ArrayList()
override fun accept(
k: K,
v: V,
) {
results.add(mapper.map(k, v))
}
}
fun interface BiSumOf<K, V> {
fun map(
k: K,
v: V,
): Int
}
class BiMaxOfCollector<K, V>(
val filter: BiFilter<K, V>,
val comparator: Comparator<V>,
) : BiConsumer<K, V> {
var maxK: K? = null
var maxV: V? = null
override fun accept(
k: K,
v: V,
) {
if (filter.filter(k, v)) {
if (maxK == null || comparator.compare(v, maxV) > 0) {
maxK = k
maxV = v
}
}
}
}
class BiSumOfCollector<K, V>(
val mapper: BiSumOf<K, V>,
) : BiConsumer<K, V> {
var sum = 0
override fun accept(
k: K,
v: V,
) {
sum += mapper.map(k, v)
}
}
fun interface BiSumOfLong<K, V> {
fun map(
k: K,
v: V,
): Long
}
class BiSumOfLongCollector<K, V>(
val mapper: BiSumOfLong<K, V>,
) : BiConsumer<K, V> {
var sum = 0L
override fun accept(
k: K,
v: V,
) {
sum += mapper.map(k, v)
}
}
class BiGroupByCollector<K, V, R>(
val mapper: BiNotNullMapper<K, V, R>,
) : BiConsumer<K, V> {
var results = HashMap<R, ArrayList<V>>()
override fun accept(
k: K,
v: V,
) {
val group = mapper.map(k, v)
val list = results[group]
if (list == null) {
val answer = ArrayList<V>()
answer.add(v)
results[group] = answer
} else {
list.add(v)
}
}
}
class BiCountByGroupCollector<K, V, R>(
val mapper: BiNotNullMapper<K, V, R>,
) : BiConsumer<K, V> {
var results = HashMap<R, Int>()
override fun accept(
k: K,
v: V,
) {
val group = mapper.map(k, v)
val count = results[group]
if (count == null) {
results[group] = 1
} else {
results[group] = count + 1
}
}
}
class BiSumByGroupCollector<K, V, R>(
val mapper: BiNotNullMapper<K, V, R>,
val sumOf: BiNotNullMapper<K, V, Long>,
) : BiConsumer<K, V> {
var results = HashMap<R, Long>()
override fun accept(
k: K,
v: V,
) {
val group = mapper.map(k, v)
val sum = results[group]
if (sum == null) {
results[group] = sumOf.map(k, v)
} else {
results[group] = sum + sumOf.map(k, v)
}
}
}
class BiCountIfCollector<K, V>(
val filter: BiFilter<K, V>,
) : BiConsumer<K, V> {
var count = 0
override fun accept(
k: K,
v: V,
) {
if (filter.filter(k, v)) count++
}
}
}