001package org.eclipse.aether.util.graph.traverser; 002 003/* 004 * Licensed to the Apache Software Foundation (ASF) under one 005 * or more contributor license agreements. See the NOTICE file 006 * distributed with this work for additional information 007 * regarding copyright ownership. The ASF licenses this file 008 * to you under the Apache License, Version 2.0 (the 009 * "License"); you may not use this file except in compliance 010 * with the License. You may obtain a copy of the License at 011 * 012 * http://www.apache.org/licenses/LICENSE-2.0 013 * 014 * Unless required by applicable law or agreed to in writing, 015 * software distributed under the License is distributed on an 016 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 017 * KIND, either express or implied. See the License for the 018 * specific language governing permissions and limitations 019 * under the License. 020 */ 021 022import org.eclipse.aether.collection.DependencyCollectionContext; 023import org.eclipse.aether.collection.DependencyTraverser; 024import org.eclipse.aether.graph.Dependency; 025 026/** 027 * A dependency traverser which always or never traverses children. 028 */ 029public final class StaticDependencyTraverser 030 implements DependencyTraverser 031{ 032 033 private final boolean traverse; 034 035 /** 036 * Creates a new traverser with the specified traversal behavior. 037 * 038 * @param traverse {@code true} to traverse all dependencies, {@code false} to never traverse. 039 */ 040 public StaticDependencyTraverser( boolean traverse ) 041 { 042 this.traverse = traverse; 043 } 044 045 public boolean traverseDependency( Dependency dependency ) 046 { 047 return traverse; 048 } 049 050 public DependencyTraverser deriveChildTraverser( DependencyCollectionContext context ) 051 { 052 return this; 053 } 054 055 @Override 056 public boolean equals( Object obj ) 057 { 058 if ( this == obj ) 059 { 060 return true; 061 } 062 else if ( null == obj || !getClass().equals( obj.getClass() ) ) 063 { 064 return false; 065 } 066 067 StaticDependencyTraverser that = (StaticDependencyTraverser) obj; 068 return traverse == that.traverse; 069 } 070 071 @Override 072 public int hashCode() 073 { 074 int hash = getClass().hashCode(); 075 hash = hash * 31 + ( traverse ? 1 : 0 ); 076 return hash; 077 } 078 079}