/*
* Copyright 2014 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.internal.resource.transport.aws.s3;
import com.amazonaws.services.s3.model.ObjectListing;
import com.amazonaws.services.s3.model.S3ObjectSummary;
import com.google.common.base.Function;
import com.google.common.base.Predicates;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Iterables;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class S3ResourceResolver {
private static final Pattern FILENAME_PATTERN = Pattern.compile("[^/]+\\.*$");
private static final Function<S3ObjectSummary, String> EXTRACT_FILE_NAME = new Function<S3ObjectSummary, String>() {
@Override
public String apply(S3ObjectSummary input) {
Matcher matcher = FILENAME_PATTERN.matcher(input.getKey());
if (matcher.find()) {
String group = matcher.group(0);
return group.contains(".") ? group : null;
}
return null;
}
};
public List<String> resolveResourceNames(ObjectListing objectListing) {
List<String> results = new ArrayList<String>();
results.addAll(resolveFileResourceNames(objectListing));
results.addAll(resolveDirectoryResourceNames(objectListing));
return results;
}
private List<String> resolveFileResourceNames(ObjectListing objectListing) {
List<S3ObjectSummary> objectSummaries = objectListing.getObjectSummaries();
if (null != objectSummaries) {
return ImmutableList.copyOf(Iterables.filter(
Iterables.transform(objectSummaries, EXTRACT_FILE_NAME),
Predicates.notNull()
));
}
return Collections.emptyList();
}
private List<String> resolveDirectoryResourceNames(ObjectListing objectListing) {
ImmutableList.Builder<String> builder = ImmutableList.builder();
if (objectListing.getCommonPrefixes() != null) {
for (String prefix : objectListing.getCommonPrefixes()) {
/**
* The common prefixes will also include the prefix of the <code>ObjectListing</code>
*/
String directChild = prefix.split(Pattern.quote(objectListing.getPrefix()))[1];
if (directChild.endsWith("/")) {
builder.add(directChild.substring(0, directChild.length() - 1));
} else {
builder.add(directChild);
}
}
return builder.build();
}
return Collections.emptyList();
}
}