| /* |
| * 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.eclipse.aether.util.graph.version; |
| |
| import java.util.Arrays; |
| import java.util.Collection; |
| |
| import org.eclipse.aether.RepositoryException; |
| import org.eclipse.aether.collection.DependencyCollectionContext; |
| import org.eclipse.aether.collection.VersionFilter; |
| |
| /** |
| * A version filter that combines multiple version filters into a chain where each filter gets invoked one after the |
| * other, thereby accumulating their filtering effects. |
| */ |
| public final class ChainedVersionFilter implements VersionFilter { |
| |
| private final VersionFilter[] filters; |
| |
| private int hashCode; |
| |
| /** |
| * Chains the specified version filters. |
| * |
| * @param filter1 The first version filter, may be {@code null}. |
| * @param filter2 The second version filter, may be {@code null}. |
| * @return The chained version filter or {@code null} if both input filters are {@code null}. |
| */ |
| public static VersionFilter newInstance(VersionFilter filter1, VersionFilter filter2) { |
| if (filter1 == null) { |
| return filter2; |
| } |
| if (filter2 == null) { |
| return filter1; |
| } |
| return new ChainedVersionFilter(new VersionFilter[] {filter1, filter2}); |
| } |
| |
| /** |
| * Chains the specified version filters. |
| * |
| * @param filters The version filters to chain, must not be {@code null} or contain {@code null}. |
| * @return The chained version filter or {@code null} if the input array is empty. |
| */ |
| public static VersionFilter newInstance(VersionFilter... filters) { |
| if (filters.length <= 1) { |
| if (filters.length <= 0) { |
| return null; |
| } |
| return filters[0]; |
| } |
| return new ChainedVersionFilter(filters.clone()); |
| } |
| |
| /** |
| * Chains the specified version filters. |
| * |
| * @param filters The version filters to chain, must not be {@code null} or contain {@code null}. |
| * @return The chained version filter or {@code null} if the input collection is empty. |
| */ |
| public static VersionFilter newInstance(Collection<? extends VersionFilter> filters) { |
| if (filters.size() <= 1) { |
| if (filters.isEmpty()) { |
| return null; |
| } |
| return filters.iterator().next(); |
| } |
| return new ChainedVersionFilter(filters.toArray(new VersionFilter[0])); |
| } |
| |
| private ChainedVersionFilter(VersionFilter[] filters) { |
| this.filters = filters; |
| } |
| |
| @Override |
| public void filterVersions(VersionFilterContext context) throws RepositoryException { |
| for (int i = 0, n = filters.length; i < n && context.getCount() > 0; i++) { |
| filters[i].filterVersions(context); |
| } |
| } |
| |
| @Override |
| public VersionFilter deriveChildFilter(DependencyCollectionContext context) { |
| VersionFilter[] children = null; |
| int removed = 0; |
| for (int i = 0, n = filters.length; i < n; i++) { |
| VersionFilter child = filters[i].deriveChildFilter(context); |
| if (children != null) { |
| children[i - removed] = child; |
| } else if (child != filters[i]) { |
| children = new VersionFilter[filters.length]; |
| System.arraycopy(filters, 0, children, 0, i); |
| children[i - removed] = child; |
| } |
| if (child == null) { |
| removed++; |
| } |
| } |
| if (children == null) { |
| return this; |
| } |
| if (removed > 0) { |
| int count = filters.length - removed; |
| if (count <= 0) { |
| return null; |
| } |
| if (count == 1) { |
| return children[0]; |
| } |
| VersionFilter[] tmp = new VersionFilter[count]; |
| System.arraycopy(children, 0, tmp, 0, count); |
| children = tmp; |
| } |
| return new ChainedVersionFilter(children); |
| } |
| |
| @Override |
| public boolean equals(Object obj) { |
| if (this == obj) { |
| return true; |
| } else if (null == obj || !getClass().equals(obj.getClass())) { |
| return false; |
| } |
| |
| ChainedVersionFilter that = (ChainedVersionFilter) obj; |
| return Arrays.equals(filters, that.filters); |
| } |
| |
| @Override |
| public int hashCode() { |
| if (hashCode == 0) { |
| int hash = getClass().hashCode(); |
| hash = hash * 31 + Arrays.hashCode(filters); |
| hashCode = hash; |
| } |
| return hashCode; |
| } |
| } |