aether-util/src/test/java/org/eclipse/aether/util/graph/visitor/FilteringDependencyVisitorTest.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 org.eclipse.aether.util.graph.visitor;

import static org.junit.Assert.*;

import java.util.List;

import org.eclipse.aether.graph.DependencyFilter;
import org.eclipse.aether.graph.DependencyNode;
import org.eclipse.aether.internal.test.util.DependencyGraphParser;
import org.junit.Test;

public class FilteringDependencyVisitorTest
{

    private DependencyNode parse( String resource )
        throws Exception
    {
        return new DependencyGraphParser( "visitor/filtering/" ).parseResource( resource );
    }

    @Test
    public void testFilterCalledWithProperParentStack()
        throws Exception
    {
        DependencyNode root = parse( "parents.txt" );

        final StringBuilder buffer = new StringBuilder( 256 );
        DependencyFilter filter = new DependencyFilter()
        {
            public boolean accept( DependencyNode node, List<DependencyNode> parents )
            {
                for ( DependencyNode parent : parents )
                {
                    buffer.append( parent.getDependency().getArtifact().getArtifactId() );
                }
                buffer.append( "," );
                return false;
            }
        };

        FilteringDependencyVisitor visitor = new FilteringDependencyVisitor( new PreorderNodeListGenerator(), filter );
        root.accept( visitor );

        assertEquals( ",a,ba,cba,a,ea,", buffer.toString() );
    }

}