loggersoft.kotlin.utils.graph.MutableGraphImpl.kt Maven / Gradle / Ivy

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/*
 * Copyright (C) 2018 Alexander Kornilov ([email protected])
 *
 * 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 loggersoft.kotlin.utils.graph

import java.util.NoSuchElementException

internal class MutableGraphImpl : GraphImpl, MutableGraph {

    constructor(vararg values: V) {
        for(value in values) insertVertex(value)
    }

    constructor(vararg edges: Edge): super(*edges)

    internal constructor(graph: Graph): super(graph)

    override fun clone(): MutableGraph = MutableGraphImpl(this)

    override fun addVertex(value: V): Vertex = insertVertex(value)

    override fun removeVertex(value: V) {
        with(getVertex(value)) { startsIn + endsIn }.forEach(::removeEdge)
        vertexesMap.remove(value)
    }

    override fun addEdge(edge: Edge): Edge = insertEdge(edge)

    override fun removeEdge(edge: Edge) {
        if (!getVertex(edge.startFrom).startsIn.remove(edge) || !getVertex(edge.endWith).endsIn.remove(edge)) throw NoSuchElementException()
        if (edgesCount > 0) edgesCount--
        if (edge.isOriented && orientedEdgesCount > 0) orientedEdgesCount--
        if (edge.isDynamicWeight && dynamicEdgesCount > 0) dynamicEdgesCount--
    }

    override fun clear() {
        vertexesMap.clear()
        edgesCount = 0
        orientedEdgesCount = 0
        dynamicEdgesCount = 0
    }
}