001/*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *   http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing,
013 * software distributed under the License is distributed on an
014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015 * KIND, either express or implied.  See the License for the
016 * specific language governing permissions and limitations
017 * under the License.
018 */
019package org.eclipse.aether.util.graph.version;
020
021import java.util.Objects;
022import java.util.function.Predicate;
023
024import org.eclipse.aether.RepositoryException;
025import org.eclipse.aether.collection.DependencyCollectionContext;
026import org.eclipse.aether.collection.VersionFilter;
027
028import static java.util.Objects.requireNonNull;
029
030/**
031 * A version filter that applies delegate version filter if context predicate applies.
032 *
033 * @since 2.0.17
034 */
035public class ContextPredicateDelegatingVersionFilter implements VersionFilter {
036    private final Predicate<VersionFilterContext> contextPredicate;
037    private final VersionFilter delegate;
038
039    /**
040     * Creates a new instance of this version filter.
041     */
042    public ContextPredicateDelegatingVersionFilter(
043            Predicate<VersionFilterContext> contextPredicate, VersionFilter delegate) {
044        this.contextPredicate = requireNonNull(contextPredicate);
045        this.delegate = requireNonNull(delegate);
046    }
047
048    @Override
049    public void filterVersions(VersionFilterContext context) throws RepositoryException {
050        if (contextPredicate.test(context)) {
051            delegate.filterVersions(context);
052        }
053    }
054
055    @Override
056    public VersionFilter deriveChildFilter(DependencyCollectionContext context) {
057        VersionFilter derived = delegate.deriveChildFilter(context);
058        if (derived == delegate) {
059            return this;
060        } else {
061            return new ContextPredicateDelegatingVersionFilter(contextPredicate, derived);
062        }
063    }
064
065    @Override
066    public boolean equals(Object o) {
067        if (this == o) {
068            return true;
069        }
070        if (o == null || getClass() != o.getClass()) {
071            return false;
072        }
073        ContextPredicateDelegatingVersionFilter that = (ContextPredicateDelegatingVersionFilter) o;
074        return Objects.equals(contextPredicate, that.contextPredicate) && Objects.equals(delegate, that.delegate);
075    }
076
077    @Override
078    public int hashCode() {
079        return Objects.hash(contextPredicate, delegate);
080    }
081}