1 package org.eclipse.aether.internal.impl.collect.df;
2
3 /*
4 * Licensed to the Apache Software Foundation (ASF) under one
5 * or more contributor license agreements. See the NOTICE file
6 * distributed with this work for additional information
7 * regarding copyright ownership. The ASF licenses this file
8 * to you under the Apache License, Version 2.0 (the
9 * "License"); you may not use this file except in compliance
10 * with the License. You may obtain a copy of the License at
11 *
12 * http://www.apache.org/licenses/LICENSE-2.0
13 *
14 * Unless required by applicable law or agreed to in writing,
15 * software distributed under the License is distributed on an
16 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
17 * KIND, either express or implied. See the License for the
18 * specific language governing permissions and limitations
19 * under the License.
20 */
21
22 import java.util.ArrayList;
23
24 import org.eclipse.aether.graph.DependencyNode;
25
26 /**
27 * Internal helper for {@link DfDependencyCollector}. Originally (pre-1.8.0) this same class was located a
28 * package higher.
29 *
30 * @since 1.8.0
31 */
32 final class NodeStack
33 {
34
35 @SuppressWarnings( {"checkstyle:magicnumber" } )
36 // CHECKSTYLE_OFF: MagicNumber
37 ArrayList<DependencyNode> nodes = new ArrayList<>( 96 );
38 // CHECKSTYLE_ON: MagicNumber
39
40 public DependencyNode top()
41 {
42 if ( nodes.isEmpty() )
43 {
44 throw new IllegalStateException( "stack empty" );
45 }
46 return nodes.get( nodes.size() - 1 );
47 }
48
49 public void push( DependencyNode node )
50 {
51 nodes.add( node );
52 }
53
54 public void pop()
55 {
56 if ( nodes.isEmpty() )
57 {
58 throw new IllegalStateException( "stack empty" );
59 }
60 nodes.remove( nodes.size() - 1 );
61 }
62
63 public int size()
64 {
65 return nodes.size();
66 }
67
68 public DependencyNode get( int index )
69 {
70 return nodes.get( index );
71 }
72
73 @Override
74 public String toString()
75 {
76 return nodes.toString();
77 }
78
79 }