/*
    * Copyright 2012 The Netty Project
    *
    * The Netty Project 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.http.multipart;
  
  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
   */
  public class MixedAttribute implements Attribute {
      private Attribute attribute;
  
      private final long limitSize;
      protected long maxSize = DefaultHttpDataFactory.MAXSIZE;
  
      public MixedAttribute(String name, long limitSize) {
          this.limitSize = limitSize;
          attribute = new MemoryAttribute(name);
      }
  
      public MixedAttribute(String name, String value, long limitSize) {
          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);
              }
          }
      }
  
      public void setMaxSize(long maxSize) {
          this.maxSize = maxSize;
          attribute.setMaxSize(maxSize);
      }
  
      public void checkSize(long newSize) throws IOException {
          if (maxSize >= 0 && newSize > maxSize) {
              throw new IOException("Size exceed allowed maximum capacity");
          }
      }
  
      public void addContent(ChannelBuffer buffer, boolean last) throws IOException {
          if (attribute instanceof MemoryAttribute) {
              checkSize(attribute.length() + buffer.readableBytes());
              if (attribute.length() + buffer.readableBytes() > limitSize) {
                  DiskAttribute diskAttribute = new DiskAttribute(attribute
                          .getName());
                  diskAttribute.setMaxSize(maxSize);
                  if (((MemoryAttribute) attribute).getChannelBuffer() != null) {
                      diskAttribute.addContent(((MemoryAttribute) attribute)
                          .getChannelBuffer(), false);
                  }
                  attribute = diskAttribute;
              }
          }
          attribute.addContent(buffer, last);
      }
  
      public void delete() {
          attribute.delete();
      }
  
      public byte[] get() throws IOException {
          return attribute.get();
      }
  
      public ChannelBuffer getChannelBuffer() throws IOException {
          return attribute.getChannelBuffer();
      }
 
     public Charset getCharset() {
         return attribute.getCharset();
     }
 
     public String getString() throws IOException {
         return attribute.getString();
     }
 
     public String getString(Charset encoding) throws IOException {
         return attribute.getString(encoding);
     }
 
     public boolean isCompleted() {
         return attribute.isCompleted();
     }
 
     public boolean isInMemory() {
         return attribute.isInMemory();
     }
 
     public long length() {
         return attribute.length();
     }
 
     public boolean renameTo(File dest) throws IOException {
         return attribute.renameTo(dest);
     }
 
     public void setCharset(Charset charset) {
         attribute.setCharset(charset);
     }
 
     public void setContent(ChannelBuffer buffer) throws IOException {
         checkSize(buffer.readableBytes());
         if (buffer.readableBytes() > limitSize) {
             if (attribute instanceof MemoryAttribute) {
                 // change to Disk
                 attribute = new DiskAttribute(attribute.getName());
                 attribute.setMaxSize(maxSize);
             }
         }
         attribute.setContent(buffer);
     }
 
     public void setContent(File file) throws IOException {
         checkSize(file.length());
         if (file.length() > limitSize) {
             if (attribute instanceof MemoryAttribute) {
                 // change to Disk
                 attribute = new DiskAttribute(attribute.getName());
                 attribute.setMaxSize(maxSize);
             }
         }
         attribute.setContent(file);
     }
 
     public void setContent(InputStream inputStream) throws IOException {
         if (attribute instanceof MemoryAttribute) {
             // change to Disk even if we don't know the size
             attribute = new DiskAttribute(attribute.getName());
             attribute.setMaxSize(maxSize);
         }
         attribute.setContent(inputStream);
     }
 
     public HttpDataType getHttpDataType() {
         return attribute.getHttpDataType();
     }
 
     public String getName() {
         return attribute.getName();
     }
 
     public int compareTo(InterfaceHttpData o) {
         return attribute.compareTo(o);
     }
 
     @Override
     public String toString() {
         return "Mixed: " + attribute.toString();
     }
 
     public String getValue() throws IOException {
         return attribute.getValue();
     }
 
     public void setValue(String value) throws IOException {
         if (value != null) {
             checkSize(value.getBytes().length);
         }
         attribute.setValue(value);
     }
 
     public ChannelBuffer getChunk(int length) throws IOException {
         return attribute.getChunk(length);
     }
 
     public File getFile() throws IOException {
         return attribute.getFile();
     }
 
 }