org.jclouds.io.CopyInputStreamIntoSupplier Maven / Gradle / Ivy

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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.io;

import java.io.IOException;
import java.io.InputStream;

import javax.annotation.Resource;

import org.jclouds.logging.Logger;

import com.google.common.annotations.Beta;
import com.google.common.base.Function;
import com.google.common.io.ByteStreams;
import com.google.common.io.Closeables;
import com.google.common.io.InputSupplier;

/**
 * 
 * @author Adrian Cole
 */
@Beta
public class CopyInputStreamIntoSupplier implements Function> {
   @Resource
   protected Logger logger = Logger.NULL;

   @SuppressWarnings("unchecked")
   @Override
   public InputSupplier apply(InputStream from) {
      if (from == null)
         return new InputSupplier() {

            @Override
            public InputStream getInput() throws IOException {
               return null;
            }

         };
      try {
         return InputSupplier.class.cast(ByteStreams.newInputStreamSupplier(ByteStreams.toByteArray(from)));
      } catch (Exception e) {
         logger.warn(e, "ignoring problem retrieving credentials");
         return null;
      } finally {
         Closeables.closeQuietly(from);
      }
   }
}