com.google.common.graph.GraphConstants Maven / Gradle / Ivy
/*
* 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;
/** A utility class to hold various constants used by the Guava Graph library. */
@ElementTypesAreNonnullByDefault
final class GraphConstants {
private GraphConstants() {}
static final int EXPECTED_DEGREE = 2;
static final int DEFAULT_NODE_COUNT = 10;
static final int DEFAULT_EDGE_COUNT = DEFAULT_NODE_COUNT * EXPECTED_DEGREE;
// Load factor and capacity for "inner" (i.e. per node/edge element) hash sets or maps
static final float INNER_LOAD_FACTOR = 1.0f;
static final int INNER_CAPACITY = 2; // ceiling(EXPECTED_DEGREE / INNER_LOAD_FACTOR)
// Error messages
static final String NODE_NOT_IN_GRAPH = "Node %s is not an element of this graph.";
static final String EDGE_NOT_IN_GRAPH = "Edge %s is not an element of this graph.";
static final String REUSING_EDGE =
"Edge %s already exists between the following nodes: %s, "
+ "so it cannot be reused to connect the following nodes: %s.";
static final String MULTIPLE_EDGES_CONNECTING =
"Cannot call edgeConnecting() when parallel edges exist between %s and %s. Consider calling "
+ "edgesConnecting() instead.";
static final String PARALLEL_EDGES_NOT_ALLOWED =
"Nodes %s and %s are already connected by a different edge. To construct a graph "
+ "that allows parallel edges, call allowsParallelEdges(true) on the Builder.";
static final String SELF_LOOPS_NOT_ALLOWED =
"Cannot add self-loop edge on node %s, as self-loops are not allowed. To construct a graph "
+ "that allows self-loops, call allowsSelfLoops(true) on the Builder.";
static final String NOT_AVAILABLE_ON_UNDIRECTED =
"Cannot call source()/target() on a EndpointPair from an undirected graph. Consider calling "
+ "adjacentNode(node) if you already have a node, or nodeU()/nodeV() if you don't.";
static final String EDGE_ALREADY_EXISTS = "Edge %s already exists in the graph.";
static final String ENDPOINTS_MISMATCH =
"Mismatch: endpoints' ordering is not compatible with directionality of the graph";
/** Singleton edge value for {@link Graph} implementations backed by {@link ValueGraph}s. */
enum Presence {
EDGE_EXISTS
}
}