Java tutorial
/* * 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.azureblob.blobstore.functions; import java.util.SortedSet; import javax.inject.Inject; import javax.inject.Singleton; import org.jclouds.azureblob.domain.BlobProperties; import org.jclouds.azureblob.domain.ListBlobsResponse; import org.jclouds.azureblob.domain.MutableBlobProperties; import org.jclouds.azureblob.domain.internal.HashSetListBlobsResponse; import org.jclouds.blobstore.domain.BlobMetadata; import org.jclouds.blobstore.domain.PageSet; import org.jclouds.blobstore.domain.StorageMetadata; import org.jclouds.blobstore.domain.StorageType; import com.google.common.base.Function; import com.google.common.base.Predicate; import com.google.common.collect.Iterables; import com.google.common.collect.Sets; /** * @author Adrian Cole */ @Singleton public class ResourceToListBlobsResponse implements Function<PageSet<? extends StorageMetadata>, ListBlobsResponse> { private final BlobMetadataToBlobProperties blob2ObjectMd; @Inject public ResourceToListBlobsResponse(BlobMetadataToBlobProperties blob2ObjectMd) { this.blob2ObjectMd = blob2ObjectMd; } public ListBlobsResponse apply(PageSet<? extends StorageMetadata> list) { Iterable<BlobProperties> contents = Iterables .transform(Iterables.filter(list, new Predicate<StorageMetadata>() { public boolean apply(StorageMetadata input) { return input.getType() == StorageType.BLOB; } }), new Function<StorageMetadata, BlobProperties>() { public MutableBlobProperties apply(StorageMetadata from) { return blob2ObjectMd.apply((BlobMetadata) from); } }); SortedSet<String> commonPrefixes = Sets .newTreeSet(Iterables.transform(Iterables.filter(list, new Predicate<StorageMetadata>() { public boolean apply(StorageMetadata input) { return input.getType() == StorageType.RELATIVE_PATH; } }), new Function<StorageMetadata, String>() { public String apply(StorageMetadata from) { return from.getName(); } })); return new HashSetListBlobsResponse(contents, null, null, null, null, list.getNextMarker(), "/", commonPrefixes); } }