jetbrains.exodus.query.InMemoryHeapSortIterableWithValueGetter.kt Maven / Gradle / Ivy

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Xodus is pure Java transactional schema-less embedded database

There is a newer version: 2.0.1

/**
 * Copyright 2010 - 2017 JetBrains s.r.o.
 *
 * 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 jetbrains.exodus.query

import jetbrains.exodus.entitystore.ComparableGetter
import jetbrains.exodus.entitystore.Entity
import java.util.*

class InMemoryHeapSortIterableWithValueGetter(override val source: Iterable,
                                              private val valueGetter: ComparableGetter,
                                              private val valueComparator: Comparator>) : InMemoryQueueSortIterableMixin {

    override fun createQueue(unsorted: Collection): Queue {
        val result = PriorityMap(unsorted.size, valueComparator, valueGetter)
        unsorted.forEach { result.offer(it) }
        return result
    }
}