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/*
 * JBoss, Home of Professional Open Source
 * Copyright 2010, Red Hat Middleware LLC, and individual contributors
 * by the @authors tag. See the copyright.txt in the distribution for a
 * full listing of individual contributors.
 *
 * 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.jboss.arquillian.container.tomcat;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 * Package private class that helps get byte array from {@link InputStream}.
 * Needed by the common assets in api.
 *
 * @author Ken Gullaksen
 * @version $Revision: $
 */
class ByteArrayIOUtil
{

   private static final Logger log = Logger.getLogger(ByteArrayIOUtil.class.getName());

   /**
    * Obtains the contents of the specified stream
    * as a byte array
    *
    * @param in InputStream
    * @throws IllegalArgumentException If the stream was not specified
    * @return the byte[] for the given InputStream
    */
   static byte[] asByteArray(final InputStream in) throws IllegalArgumentException
   {
      // Precondition check
      if (in == null) {
         throw new IllegalArgumentException("stream must be specified");
      }

      // Get content as an array of bytes
      final ByteArrayOutputStream out = new ByteArrayOutputStream(8192);
      final int len = 4096;
      final byte[] buffer = new byte[len];
      int read = 0;
      try {
         while (((read = in.read(buffer)) != -1)) {
            out.write(buffer, 0, read);
         }
      }
      catch (final IOException ioe) {
         throw new RuntimeException("Error in obtainting bytes from " + in, ioe);
      }
      finally {
         try {
            in.close();
         }
         catch (final IOException ignore) {
            if (log.isLoggable(Level.FINER)) {
               log.finer("Could not close stream due to: " + ignore.getMessage() + "; ignoring");
            }
         }
         // We don't need to close the outstream, it's a byte array out
      }

      // Represent as byte array
      final byte[] content = out.toByteArray();

      // Return
      return content;
   }
}