package org.eclipse.aether.internal.impl.collect;

/*
 * 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.
 */

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.
/** * 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<>(); } public ArtifactType get( String typeId ) { ArtifactType type = types.get( typeId ); if ( type == null ) { type = delegate.get( typeId ); types.put( typeId, type ); } return type; } }