| /* |
| * 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.apache.maven.index; |
| |
| import java.util.ArrayList; |
| import java.util.Collections; |
| import java.util.List; |
| |
| import org.apache.maven.index.context.IndexingContext; |
| |
| /** |
| * An abstract helper class for implementing ArtifactInfoFilter that actually aggregates multiple filters into one. It |
| * is up to developer to implement how will be they behave ("fail-fast", or "one-vote-enough for passing", etc). |
| * |
| * @author cstamas |
| */ |
| public abstract class AbstractMultiArtifactInfoFilter implements ArtifactInfoFilter { |
| private final List<ArtifactInfoFilter> filters; |
| |
| public AbstractMultiArtifactInfoFilter(final List<ArtifactInfoFilter> filters) { |
| if (filters == null || filters.isEmpty()) { |
| this.filters = null; |
| } else { |
| this.filters = new ArrayList<>(filters); |
| } |
| } |
| |
| /** |
| * Returns an unmodifiable list of filters. |
| * |
| * @return |
| */ |
| public List<ArtifactInfoFilter> getFilters() { |
| if (filters == null) { |
| return Collections.emptyList(); |
| } else { |
| return Collections.unmodifiableList(filters); |
| } |
| } |
| |
| /** |
| * The filter's implementation is: if list of filters is empty, the just accept it, otherwise consult the list of |
| * filters. |
| */ |
| public boolean accepts(IndexingContext ctx, ArtifactInfo ai) { |
| if (this.filters == null) { |
| return true; |
| } else { |
| return accepts(filters, ctx, ai); |
| } |
| } |
| |
| /** |
| * It is left to final implementor to implement how we want to decide using filters. This method is called only if |
| * we _have_ filters set! |
| * |
| * @param filters |
| * @param ctx |
| * @param ai |
| * @return |
| */ |
| protected abstract boolean accepts(List<ArtifactInfoFilter> filters, IndexingContext ctx, ArtifactInfo ai); |
| } |