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/**
 *
 * Copyright (C) 2010 Cloud Conscious, LLC. 
 *
 * ====================================================================
 * Licensed 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.aws.ec2.functions;

import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkNotNull;

import javax.inject.Singleton;

import org.jclouds.crypto.CryptoStreams;

import com.google.common.base.Function;

/**
 * Binds base64 encodes the byte [] input
 * 
 * @author Adrian Cole
 */
@Singleton
public class ConvertUnencodedBytesToBase64EncodedString implements Function {

   @Override
   public String apply(Object from) {
      checkArgument(checkNotNull(from, "input") instanceof byte[], "this binder is only valid for byte []!");

      byte[] unencodedData = (byte[]) from;
      checkArgument(checkNotNull(unencodedData, "unencodedData").length <= 16 * 1024,
               "userData cannot be larger than 16kb");
      return CryptoStreams.base64(unencodedData);
   }
}