BlobReadCommand.java

/*
 * 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.
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package org.jclouds.karaf.commands.blobstore;

import static org.jclouds.util.Closeables2.closeQuietly;

import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;

import org.apache.felix.gogo.commands.Argument;
import org.apache.felix.gogo.commands.Command;
import org.apache.felix.gogo.commands.CommandException;
import org.apache.felix.gogo.commands.Option;
import org.jclouds.blobstore.BlobStore;
import org.jclouds.blobstore.KeyNotFoundException;

import com.google.common.base.Charsets;
import com.google.common.base.Strings;
import com.google.common.io.CharStreams;
import com.google.common.io.Closeables;
import com.google.common.io.Files;
import com.google.common.io.InputSupplier;

@Command(scope = "jclouds", name = "blobstore-read", description = "Reads data from the blobstore")
public class BlobReadCommand extends BlobStoreCommandWithOptions {

   @Argument(index = 0, name = "containerName", description = "The name of the container", required = true, multiValued = false)
   String containerName;

   @Argument(index = 1, name = "blobName", description = "The name of the blob", required = true, multiValued = false)
   String blobName;

   @Argument(index = 2, name = "toFile", description = "The file to store the blob", required = false, multiValued = false)
   String fileName;

   @Option(name = "-d", aliases = "--display", description = "Display the content to the console", required = false, multiValued = false)
   boolean display;

   @Option(name = "-S", aliases = "--signed-request", description = "Use a signed request", required = false, multiValued = false)
   boolean signedRequest;

   @Override
   protected Object doExecute() throws Exception {
      BlobStore blobStore = getBlobStore();

      InputStream is = getBlobInputStream(blobStore, containerName, blobName, signedRequest);
      try {
         if (display) {
            CharStreams.copy(new InputStreamReader(is, Charsets.UTF_8), System.out);
            System.out.flush();
         } else {
            if (fileName == null) {
               throw new CommandException("Must specify --display or file name");
            }
            File file = new File(fileName);
            if (!file.exists() && !file.createNewFile()) {
               throw new IOException("Could not create: " + file);
            }
            Files.asByteSink(file).writeFrom(is);
         }
      } finally {
         closeQuietly(is);
      }

      return null;
   }
}