| /******************************************************************************* |
| * Copyright (c) 2010, 2011 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: |
| * Sonatype, Inc. - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.aether.internal.impl; |
| |
| import java.util.HashMap; |
| import java.util.Map; |
| |
| import org.eclipse.aether.RepositorySystemSession; |
| import org.eclipse.aether.artifact.ArtifactType; |
| import org.eclipse.aether.artifact.ArtifactTypeRegistry; |
| |
| /** |
| * A short-lived artifact type registry that caches results from a presumedly slower type registry. |
| */ |
| class CachingArtifactTypeRegistry |
| implements ArtifactTypeRegistry |
| { |
| |
| private final ArtifactTypeRegistry delegate; |
| |
| private final Map<String, ArtifactType> types; |
| |
| public static ArtifactTypeRegistry newInstance( RepositorySystemSession session ) |
| { |
| return newInstance( session.getArtifactTypeRegistry() ); |
| } |
| |
| public static ArtifactTypeRegistry newInstance( ArtifactTypeRegistry delegate ) |
| { |
| return ( delegate != null ) ? new CachingArtifactTypeRegistry( delegate ) : null; |
| } |
| |
| private CachingArtifactTypeRegistry( ArtifactTypeRegistry delegate ) |
| { |
| this.delegate = delegate; |
| types = new HashMap<String, ArtifactType>(); |
| } |
| |
| public ArtifactType get( String typeId ) |
| { |
| ArtifactType type = types.get( typeId ); |
| |
| if ( type == null ) |
| { |
| type = delegate.get( typeId ); |
| types.put( typeId, type ); |
| } |
| |
| return type; |
| } |
| |
| } |