package org.eclipse.aether.internal.impl.collect;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import org.eclipse.aether.graph.Dependency;
import org.eclipse.aether.graph.DependencyCycle;
import org.eclipse.aether.graph.DependencyNode;
import org.eclipse.aether.util.artifact.ArtifactIdUtils;
final class DefaultDependencyCycle
implements DependencyCycle
{
private final List<Dependency> dependencies;
private final int cycleEntry;
DefaultDependencyCycle( NodeStack nodes, int cycleEntry, Dependency dependency )
{
int offset = ( cycleEntry > 0 && nodes.get( 0 ).getDependency() == null ) ? 1 : 0;
Dependency[] dependencies = new Dependency[nodes.size() - offset + 1];
for ( int i = 0, n = dependencies.length - 1; i < n; i++ )
{
DependencyNode node = nodes.get( i + offset );
dependencies[i] = node.getDependency();
if ( dependencies[i] == null )
{
dependencies[i] = new Dependency( node.getArtifact(), null );
}
}
dependencies[dependencies.length - 1] = dependency;
this.dependencies = Collections.unmodifiableList( Arrays.asList( dependencies ) );
this.cycleEntry = cycleEntry;
}
public List<Dependency> getPrecedingDependencies()
{
return dependencies.subList( 0, cycleEntry );
}
public List<Dependency> getCyclicDependencies()
{
return dependencies.subList( cycleEntry, dependencies.size() );
}
@Override
public String toString()
{
StringBuilder buffer = new StringBuilder( 256 );
for ( int i = 0, n = dependencies.size(); i < n; i++ )
{
if ( i > 0 )
{
buffer.append( " -> " );
}
buffer.append( ArtifactIdUtils.toVersionlessId( dependencies.get( i ).getArtifact() ) );
}
return buffer.toString();
}
}