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jclouds components to access Azure Blob Service

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/**
 * Licensed to jclouds, Inc. (jclouds) under one or more
 * contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  jclouds 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.strategy;

import java.util.Arrays;

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

import org.jclouds.azureblob.AzureBlobClient;
import org.jclouds.azureblob.domain.BlobProperties;
import org.jclouds.blobstore.domain.BlobMetadata;
import org.jclouds.blobstore.functions.ObjectMD5;
import org.jclouds.blobstore.internal.BlobRuntimeException;
import org.jclouds.blobstore.options.ListContainerOptions;
import org.jclouds.blobstore.strategy.ContainsValueInListStrategy;
import org.jclouds.blobstore.strategy.ListBlobsInContainer;

import com.google.common.base.Throwables;

/**
 * Searches Content-MD5 tag for the value associated with the value
 * 
 * @author Adrian Cole
 */
@Singleton
public class FindMD5InBlobProperties implements ContainsValueInListStrategy {

   protected final ObjectMD5 objectMD5;
   protected final ListBlobsInContainer getAllBlobMetadata;
   private final AzureBlobClient client;

   @Inject
   private FindMD5InBlobProperties(ObjectMD5 objectMD5,
            ListBlobsInContainer getAllBlobMetadata, AzureBlobClient client) {
      this.objectMD5 = objectMD5;
      this.getAllBlobMetadata = getAllBlobMetadata;
      this.client = client;
   }

   public boolean execute(String containerName, Object value, ListContainerOptions options) {
      try {
         byte[] toSearch = objectMD5.apply(value);
         for (BlobMetadata metadata : getAllBlobMetadata.execute(containerName, options)) {
            BlobProperties properties = client.getBlobProperties(containerName, metadata.getName());
            if (Arrays.equals(toSearch, properties.getContentMetadata().getContentMD5()))
               return true;
         }
         return false;
      } catch (Exception e) {
         Throwables.propagateIfPossible(e, BlobRuntimeException.class);
         throw new BlobRuntimeException(String.format(
                  "Error searching for ETAG of value: [%2$s] in container:%1$s", containerName,
                  value), e);
      }
   }

}