/*
* Copyright 2011 the original author or authors.
*
* Licensed 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.gradle.api.internal.artifacts.ivyservice.resolveengine;
import org.gradle.api.internal.artifacts.ivyservice.ivyresolve.strategy.Version;
import org.gradle.api.internal.artifacts.ivyservice.ivyresolve.strategy.VersionComparator;
import org.gradle.api.internal.artifacts.ivyservice.ivyresolve.strategy.VersionParser;
import org.gradle.internal.component.model.ComponentResolveMetadata;
import java.util.*;
class LatestModuleConflictResolver implements ModuleConflictResolver {
private final Comparator<Version> versionComparator;
LatestModuleConflictResolver(VersionComparator versionComparator) {
this.versionComparator = versionComparator.asVersionComparator();
}
public <T extends ComponentResolutionState> T select(Collection<? extends T> candidates) {
// Find the candidates with the highest base version
Version baseVersion = null;
Map<Version, T> matches = new LinkedHashMap<Version, T>();
for (T candidate : candidates) {
Version version = VersionParser.INSTANCE.transform(candidate.getVersion());
if (baseVersion == null || versionComparator.compare(version.getBaseVersion(), baseVersion) > 0) {
matches.clear();
baseVersion = version.getBaseVersion();
matches.put(version, candidate);
} else if (version.getBaseVersion().equals(baseVersion)) {
matches.put(version, candidate);
}
}
if (matches.size() == 1) {
return matches.values().iterator().next();
}
// Work backwards from highest version, return the first candidate with qualified version and release status, or candidate with unqualified version
List<Version> sorted = new ArrayList<Version>(matches.keySet());
Collections.sort(sorted, Collections.reverseOrder(versionComparator));
for (Version version : sorted) {
T component = matches.get(version);
if (!version.isQualified()) {
return component;
}
ComponentResolveMetadata metaData = component.getMetaData();
if (metaData != null && "release".equals(metaData.getStatus())) {
return component;
}
}
// Nothing - just return the highest version
return matches.get(sorted.get(0));
}
}