/*
    * 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 io.netty.handler.codec.http.multipart;
  
  import io.netty.buffer.ByteBuf;
  import io.netty.channel.ChannelException;
  import io.netty.handler.codec.http.HttpConstants;
  
  import java.io.IOException;
  
  import static io.netty.buffer.Unpooled.*;
  
  /**
   * Disk implementation of Attributes
   */
  public class DiskAttribute extends AbstractDiskHttpData implements Attribute {
      public static String baseDirectory;
  
      public static boolean deleteOnExitTemporaryFile = true;
  
      public static final String prefix = "Attr_";
  
      public static final String postfix = ".att";
  
      /**
       * Constructor used for huge Attribute
       */
      public DiskAttribute(String name) {
          super(name, HttpConstants.DEFAULT_CHARSET, 0);
      }
  
      public DiskAttribute(String name, String value) throws IOException {
          super(name, HttpConstants.DEFAULT_CHARSET, 0); // Attribute have no default size
          setValue(value);
      }
  
      @Override
      public HttpDataType getHttpDataType() {
          return HttpDataType.Attribute;
      }
  
      @Override
      public String getValue() throws IOException {
          byte [] bytes = get();
          return new String(bytes, charset.name());
      }
  
      @Override
      public void setValue(String value) throws IOException {
          if (value == null) {
              throw new NullPointerException("value");
          }
          byte [] bytes = value.getBytes(charset.name());
          ByteBuf buffer = wrappedBuffer(bytes);
          if (definedSize > 0) {
              definedSize = buffer.readableBytes();
          }
          setContent(buffer);
      }
  
      @Override
      public void addContent(ByteBuf buffer, boolean last) throws IOException {
          int localsize = buffer.readableBytes();
          if (definedSize > 0 && definedSize < size + localsize) {
              definedSize = size + localsize;
          }
          super.addContent(buffer, last);
      }
      @Override
      public int hashCode() {
          return getName().hashCode();
      }
  
      @Override
      public boolean equals(Object o) {
          if (!(o instanceof Attribute)) {
              return false;
          }
          Attribute attribute = (Attribute) o;
          return getName().equalsIgnoreCase(attribute.getName());
      }
  
      @Override
      public int compareTo(InterfaceHttpData o) {
          if (!(o instanceof Attribute)) {
              throw new ClassCastException("Cannot compare " + getHttpDataType() +
                     " with " + o.getHttpDataType());
         }
         return compareTo((Attribute) o);
     }
 
     public int compareTo(Attribute o) {
         return getName().compareToIgnoreCase(o.getName());
     }
 
     @Override
     public String toString() {
         try {
             return getName() + '=' + getValue();
         } catch (IOException e) {
             return getName() + "=IoException";
         }
     }
 
     @Override
     protected boolean deleteOnExit() {
         return deleteOnExitTemporaryFile;
     }
 
     @Override
     protected String getBaseDirectory() {
         return baseDirectory;
     }
 
     @Override
     protected String getDiskFilename() {
         return getName() + postfix;
     }
 
     @Override
     protected String getPostfix() {
         return postfix;
     }
 
     @Override
     protected String getPrefix() {
         return prefix;
     }
 
     @Override
     public Attribute copy() {
         DiskAttribute attr = new DiskAttribute(getName());
         attr.setCharset(getCharset());
         ByteBuf content = content();
         if (content != null) {
             try {
                 attr.setContent(content.copy());
             } catch (IOException e) {
                 throw new ChannelException(e);
             }
         }
         return attr;
     }
 
     @Override
     public Attribute duplicate() {
         DiskAttribute attr = new DiskAttribute(getName());
         attr.setCharset(getCharset());
         ByteBuf content = content();
         if (content != null) {
             try {
                 attr.setContent(content.duplicate());
             } catch (IOException e) {
                 throw new ChannelException(e);
             }
         }
         return attr;
     }
 
     @Override
     public Attribute retain(int increment) {
         super.retain(increment);
         return this;
     }
 
     @Override
     public Attribute retain() {
         super.retain();
         return this;
     }
 }