| /******************************************************************************* |
| * Copyright (c) 2010, 2013 Sonatype, Inc. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v10.html |
| * |
| * Contributors: |
| * Stuart McCulloch (Sonatype, Inc.) - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.sisu.wire; |
| |
| import java.util.HashSet; |
| import java.util.Set; |
| |
| import org.eclipse.sisu.inject.Logs; |
| |
| import com.google.inject.Binder; |
| import com.google.inject.Binding; |
| import com.google.inject.Key; |
| import com.google.inject.spi.DefaultElementVisitor; |
| import com.google.inject.spi.Element; |
| import com.google.inject.spi.ElementVisitor; |
| |
| /** |
| * {@link ElementVisitor} that verifies {@link Binding}s and merges any duplicates. |
| */ |
| final class ElementMerger |
| extends DefaultElementVisitor<Void> |
| { |
| // ---------------------------------------------------------------------- |
| // Implementation fields |
| // ---------------------------------------------------------------------- |
| |
| private final DependencyVerifier verifier = new DependencyVerifier(); |
| |
| private final Set<Key<?>> localKeys = new HashSet<Key<?>>(); |
| |
| private final Binder binder; |
| |
| // ---------------------------------------------------------------------- |
| // Constructors |
| // ---------------------------------------------------------------------- |
| |
| ElementMerger( final Binder binder ) |
| { |
| this.binder = binder; |
| } |
| |
| // ---------------------------------------------------------------------- |
| // Public methods |
| // ---------------------------------------------------------------------- |
| |
| @Override |
| public <T> Void visit( final Binding<T> binding ) |
| { |
| final Key<T> key = binding.getKey(); |
| if ( !localKeys.contains( key ) ) |
| { |
| if ( binding.acceptTargetVisitor( verifier ).booleanValue() ) |
| { |
| localKeys.add( key ); |
| binding.applyTo( binder ); |
| } |
| else |
| { |
| Logs.trace( "Discard binding: {}", binding, null ); |
| } |
| } |
| return null; |
| } |
| |
| @Override |
| public Void visitOther( final Element element ) |
| { |
| element.applyTo( binder ); |
| return null; |
| } |
| } |