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 static org.junit.Assert.*;
023
024import org.eclipse.aether.artifact.DefaultArtifact;
025import org.eclipse.aether.collection.DependencyCollectionContext;
026import org.eclipse.aether.collection.DependencyTraverser;
027import org.eclipse.aether.graph.Dependency;
028import org.junit.Test;
029
030public class AndDependencyTraverserTest
031{
032
033    static class DummyDependencyTraverser
034        implements DependencyTraverser
035    {
036
037        private final boolean traverse;
038
039        private final DependencyTraverser child;
040
041        public DummyDependencyTraverser()
042        {
043            this( true );
044        }
045
046        public DummyDependencyTraverser( boolean traverse )
047        {
048            this.traverse = traverse;
049            this.child = this;
050        }
051
052        public DummyDependencyTraverser( boolean traverse, DependencyTraverser child )
053        {
054            this.traverse = traverse;
055            this.child = child;
056        }
057
058        public boolean traverseDependency( Dependency dependency )
059        {
060            return traverse;
061        }
062
063        public DependencyTraverser deriveChildTraverser( DependencyCollectionContext context )
064        {
065            return child;
066        }
067
068    }
069
070    @Test
071    public void testNewInstance()
072    {
073        assertNull( AndDependencyTraverser.newInstance( null, null ) );
074        DependencyTraverser traverser = new DummyDependencyTraverser();
075        assertSame( traverser, AndDependencyTraverser.newInstance( traverser, null ) );
076        assertSame( traverser, AndDependencyTraverser.newInstance( null, traverser ) );
077        assertSame( traverser, AndDependencyTraverser.newInstance( traverser, traverser ) );
078        assertNotNull( AndDependencyTraverser.newInstance( traverser, new DummyDependencyTraverser() ) );
079    }
080
081    @Test
082    public void testTraverseDependency()
083    {
084        Dependency dependency = new Dependency( new DefaultArtifact( "g:a:v:1" ), "runtime" );
085
086        DependencyTraverser traverser = new AndDependencyTraverser();
087        assertTrue( traverser.traverseDependency( dependency ) );
088
089        traverser =
090            new AndDependencyTraverser( new DummyDependencyTraverser( false ), new DummyDependencyTraverser( false ) );
091        assertFalse( traverser.traverseDependency( dependency ) );
092
093        traverser =
094            new AndDependencyTraverser( new DummyDependencyTraverser( true ), new DummyDependencyTraverser( false ) );
095        assertFalse( traverser.traverseDependency( dependency ) );
096
097        traverser =
098            new AndDependencyTraverser( new DummyDependencyTraverser( true ), new DummyDependencyTraverser( true ) );
099        assertTrue( traverser.traverseDependency( dependency ) );
100    }
101
102    @Test
103    public void testDeriveChildTraverser_Unchanged()
104    {
105        DependencyTraverser other1 = new DummyDependencyTraverser( true );
106        DependencyTraverser other2 = new DummyDependencyTraverser( false );
107        DependencyTraverser traverser = new AndDependencyTraverser( other1, other2 );
108        assertSame( traverser, traverser.deriveChildTraverser( null ) );
109    }
110
111    @Test
112    public void testDeriveChildTraverser_OneRemaining()
113    {
114        DependencyTraverser other1 = new DummyDependencyTraverser( true );
115        DependencyTraverser other2 = new DummyDependencyTraverser( false, null );
116        DependencyTraverser traverser = new AndDependencyTraverser( other1, other2 );
117        assertSame( other1, traverser.deriveChildTraverser( null ) );
118    }
119
120    @Test
121    public void testDeriveChildTraverser_ZeroRemaining()
122    {
123        DependencyTraverser other1 = new DummyDependencyTraverser( true, null );
124        DependencyTraverser other2 = new DummyDependencyTraverser( false, null );
125        DependencyTraverser traverser = new AndDependencyTraverser( other1, other2 );
126        assertNull( traverser.deriveChildTraverser( null ) );
127    }
128
129    @Test
130    public void testEquals()
131    {
132        DependencyTraverser other1 = new DummyDependencyTraverser( true );
133        DependencyTraverser other2 = new DummyDependencyTraverser( false );
134        DependencyTraverser traverser1 = new AndDependencyTraverser( other1, other2 );
135        DependencyTraverser traverser2 = new AndDependencyTraverser( other2, other1 );
136        DependencyTraverser traverser3 = new AndDependencyTraverser( other1 );
137        assertEquals( traverser1, traverser1 );
138        assertEquals( traverser1, traverser2 );
139        assertNotEquals( traverser1, traverser3 );
140        assertNotEquals( traverser1, this );
141        assertNotEquals( traverser1, null );
142    }
143
144    @Test
145    public void testHashCode()
146    {
147        DependencyTraverser other1 = new DummyDependencyTraverser( true );
148        DependencyTraverser other2 = new DummyDependencyTraverser( false );
149        DependencyTraverser traverser1 = new AndDependencyTraverser( other1, other2 );
150        DependencyTraverser traverser2 = new AndDependencyTraverser( other2, other1 );
151        assertEquals( traverser1.hashCode(), traverser2.hashCode() );
152    }
153
154}