content: /*
   * 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.
   */
  
  package org.apache.shiro.util;
  
  import org.apache.shiro.lang.util.ByteSource;
  
  import java.io.Closeable;
  import java.io.IOException;
  
  /**
   * To use try-with-resources idiom, this class supports wrapping existing ByteSource
   * object or byte array. At end of try block, it gets zeroed out automatically.
   */
  public class ByteSourceWrapper implements Closeable {
      private byte[] bytes;
  
      private ByteSourceWrapper(byte[] bytes) {
          this.bytes = bytes;
      }
  
      /**
       * This method generically accepts byte array or ByteSource instance.
       */
      public static ByteSourceWrapper wrap(Object value) {
          if (value instanceof byte[]) {
              byte[] bytes = (byte[]) value;
              return new ByteSourceWrapper(bytes);
          } else if (value instanceof ByteSource) {
              byte[] bytes = ((ByteSource) value).getBytes();
              return new ByteSourceWrapper(bytes);
          }
          throw new IllegalArgumentException();
      }
  
      public byte[] getBytes() {
          return bytes;
      }
  
      public void close() throws IOException {
          ByteUtils.wipe(bytes);
      }
  }
  