org.jclouds.s3.blobstore.functions.BucketToResourceList.java Source code

Introduction

Here is the source code for org.jclouds.s3.blobstore.functions.BucketToResourceList.java

Source

/*
 * 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.jclouds.s3.blobstore.functions;

import java.util.Map;
import java.util.Set;

import javax.inject.Inject;
import javax.inject.Singleton;

import org.jclouds.blobstore.domain.PageSet;
import org.jclouds.blobstore.domain.StorageMetadata;
import org.jclouds.blobstore.domain.StorageType;
import org.jclouds.blobstore.domain.internal.PageSetImpl;
import org.jclouds.s3.domain.ListBucketResponse;

import com.google.common.base.Function;
import com.google.common.collect.Iterables;
import com.google.common.collect.Maps;
import com.google.common.collect.Sets;

/**
 * @author Adrian Cole
 */
@Singleton
public class BucketToResourceList implements Function<ListBucketResponse, PageSet<? extends StorageMetadata>> {
    private final ObjectToBlobMetadata object2blobMd;
    private final CommonPrefixesToResourceMetadata prefix2ResourceMd;

    protected final Function<StorageMetadata, String> indexer = new Function<StorageMetadata, String>() {
        @Override
        public String apply(StorageMetadata from) {
            return from.getName();
        }
    };

    @Inject
    public BucketToResourceList(ObjectToBlobMetadata object2blobMd,
            CommonPrefixesToResourceMetadata prefix2ResourceMd) {
        this.object2blobMd = object2blobMd;
        this.prefix2ResourceMd = prefix2ResourceMd;
    }

    public PageSet<? extends StorageMetadata> apply(ListBucketResponse from) {
        Set<StorageMetadata> contents = Sets.<StorageMetadata>newHashSet(Iterables.transform(from, object2blobMd));

        Map<String, StorageMetadata> nameToMd = Maps.uniqueIndex(contents, indexer);
        for (String prefix : from.getCommonPrefixes()) {
            prefix = prefix.endsWith("/") ? prefix.substring(0, prefix.lastIndexOf('/')) : prefix;
            if (!nameToMd.containsKey(prefix) || nameToMd.get(prefix).getType() != StorageType.RELATIVE_PATH)
                contents.add(prefix2ResourceMd.apply(prefix));
        }
        return new PageSetImpl<StorageMetadata>(contents, from.getNextMarker());
    }
}