/*
   * Copyright 2009 Red Hat, Inc.
   *
   * Red Hat 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.jboss.netty.handler.codec.http2;
  
  import java.io.File;
  import java.io.IOException;
  import java.io.InputStream;
  import java.nio.charset.Charset;
  
  import org.jboss.netty.buffer.ChannelBuffer;
  
  /**
  * Mixed implementation using both in Memory and in File with a limit of size
  * @author <a href="http://www.jboss.org/netty/">The Netty Project</a>
  * @author Andy Taylor (andy.taylor@jboss.org)
  * @author <a href="http://gleamynode.net/">Trustin Lee</a>
  * @author <a href="http://openr66.free.fr/">Frederic Bregier</a>
  *
  */
  public class MixedAttribute implements Attribute {
      private Attribute attribute = null;
  
      private long limitSize = 0;
  
      public MixedAttribute(String name,
              long limitSize) throws NullPointerException,
              IllegalArgumentException {
          this.limitSize = limitSize;
          attribute = new MemoryAttribute(name);
      }
  
      public MixedAttribute(String name, String value,
              long limitSize) throws NullPointerException,
              IllegalArgumentException {
          this.limitSize = limitSize;
          if (value.length() > this.limitSize) {
              try {
                  attribute = new DiskAttribute(name, value);
              } catch (IOException e) {
                  // revert to Memory mode
                  try {
                      attribute = new MemoryAttribute(name, value);
                  } catch (IOException e1) {
                      throw new IllegalArgumentException(e);
                  }
              }
          } else {
              try {
                  attribute = new MemoryAttribute(name, value);
              } catch (IOException e) {
                  throw new IllegalArgumentException(e);
              }
          }
      }
  
      @Override
      public void addContent(ChannelBuffer buffer, boolean last)
              throws IOException {
          if (attribute instanceof MemoryAttribute) {
              if (attribute.length() + buffer.readableBytes() > limitSize) {
                  DiskAttribute diskAttribute = new DiskAttribute(attribute
                          .getName());
                  if (((MemoryAttribute) attribute).getChannelBuffer() != null) {
                      diskAttribute.addContent(((MemoryAttribute) attribute)
                          .getChannelBuffer(), false);
                  }
                  attribute = diskAttribute;
              }
          }
          attribute.addContent(buffer, last);
      }
  
      @Override
      public void delete() {
          attribute.delete();
      }
  
      @Override
      public byte[] get() throws IOException {
          return attribute.get();
      }
  
      @Override
      public ChannelBuffer getChannelBuffer() throws IOException {
          return attribute.getChannelBuffer();
      }
 
     @Override
     public Charset getCharset() {
         return attribute.getCharset();
     }
 
     @Override
     public String getString() throws IOException {
         return attribute.getString();
     }
 
     @Override
     public String getString(Charset encoding) throws IOException {
         return attribute.getString(encoding);
     }
 
     @Override
     public boolean isCompleted() {
         return attribute.isCompleted();
     }
 
     @Override
     public boolean isInMemory() {
         return attribute.isInMemory();
     }
 
     @Override
     public long length() {
         return attribute.length();
     }
 
     @Override
     public boolean renameTo(File dest) throws IOException {
         return attribute.renameTo(dest);
     }
 
     @Override
     public void setCharset(Charset charset) {
         attribute.setCharset(charset);
     }
 
     @Override
     public void setContent(ChannelBuffer buffer) throws IOException {
         if (buffer.readableBytes() > limitSize) {
             if (attribute instanceof MemoryAttribute) {
                 // change to Disk
                 DiskAttribute diskAttribute = new DiskAttribute(attribute
                         .getName());
                 attribute = diskAttribute;
             }
         }
         attribute.setContent(buffer);
     }
 
     @Override
     public void setContent(File file) throws IOException {
         if (file.length() > limitSize) {
             if (attribute instanceof MemoryAttribute) {
                 // change to Disk
                 DiskAttribute diskAttribute = new DiskAttribute(attribute
                         .getName());
                 attribute = diskAttribute;
             }
         }
         attribute.setContent(file);
     }
 
     @Override
     public void setContent(InputStream inputStream) throws IOException {
         if (attribute instanceof MemoryAttribute) {
             // change to Disk even if we don't know the size
             DiskAttribute diskAttribute = new DiskAttribute(attribute
                     .getName());
             attribute = diskAttribute;
         }
         attribute.setContent(inputStream);
     }
 
     @Override
     public HttpDataType getHttpDataType() {
         return attribute.getHttpDataType();
     }
 
     @Override
     public String getName() {
         return attribute.getName();
     }
 
     @Override
     public int compareTo(InterfaceHttpData o) {
         return attribute.compareTo(o);
     }
 
     @Override
     public String toString() {
         return "Mixed: " + attribute.toString();
     }
 
     @Override
     public String getValue() throws IOException {
         return attribute.getValue();
     }
 
     @Override
     public void setValue(String value) throws IOException {
         attribute.setValue(value);
     }
 
     @Override
     public ChannelBuffer getChunk(int length) throws IOException {
         return attribute.getChunk(length);
     }
 
     @Override
     public File getFile() throws IOException {
         return attribute.getFile();
     }
 
 }