| /* |
| * Copyright (C) 2016 The Guava Authors |
| * |
| * 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 com.google.common.graph; |
| |
| import com.google.common.graph.GraphConstants.Presence; |
| |
| /** |
| * Standard implementation of {@link MutableGraph} that supports both directed and undirected |
| * graphs. Instances of this class should be constructed with {@link GraphBuilder}. |
| * |
| * <p>Time complexities for mutation methods are all O(1) except for {@code removeNode(N node)}, |
| * which is in O(d_node) where d_node is the degree of {@code node}. |
| * |
| * @author James Sexton |
| * @param <N> Node parameter type |
| */ |
| final class StandardMutableGraph<N> extends ForwardingGraph<N> implements MutableGraph<N> { |
| private final MutableValueGraph<N, Presence> backingValueGraph; |
| |
| /** Constructs a {@link MutableGraph} with the properties specified in {@code builder}. */ |
| StandardMutableGraph(AbstractGraphBuilder<? super N> builder) { |
| this.backingValueGraph = new StandardMutableValueGraph<>(builder); |
| } |
| |
| @Override |
| protected BaseGraph<N> delegate() { |
| return backingValueGraph; |
| } |
| |
| @Override |
| public boolean addNode(N node) { |
| return backingValueGraph.addNode(node); |
| } |
| |
| @Override |
| public boolean putEdge(N nodeU, N nodeV) { |
| return backingValueGraph.putEdgeValue(nodeU, nodeV, Presence.EDGE_EXISTS) == null; |
| } |
| |
| @Override |
| public boolean putEdge(EndpointPair<N> endpoints) { |
| validateEndpoints(endpoints); |
| return putEdge(endpoints.nodeU(), endpoints.nodeV()); |
| } |
| |
| @Override |
| public boolean removeNode(N node) { |
| return backingValueGraph.removeNode(node); |
| } |
| |
| @Override |
| public boolean removeEdge(N nodeU, N nodeV) { |
| return backingValueGraph.removeEdge(nodeU, nodeV) != null; |
| } |
| |
| @Override |
| public boolean removeEdge(EndpointPair<N> endpoints) { |
| validateEndpoints(endpoints); |
| return removeEdge(endpoints.nodeU(), endpoints.nodeV()); |
| } |
| } |