/*
    * 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 org.jboss.netty.buffer.ChannelBuffer;
  import org.jboss.netty.buffer.ChannelBuffers;
  import org.jboss.netty.util.CharsetUtil;
  
  import java.io.UnsupportedEncodingException;
  import java.nio.charset.Charset;
  import java.util.ArrayList;
  import java.util.List;
  
  /**
   * This Attribute is only for Encoder use to insert special command between object if needed
   * (like Multipart Mixed mode)
   */
  public class InternalAttribute implements InterfaceHttpData {
      protected final List<String> value = new ArrayList<String>();
      private final Charset charset;
  
      public InternalAttribute(Charset charset) {
          this.charset = charset;
      }
  
      public HttpDataType getHttpDataType() {
          return HttpDataType.InternalAttribute;
      }
  
      public void addValue(String value) {
          if (value == null) {
              throw new NullPointerException("value");
          }
          this.value.add(value);
      }
  
      public void addValue(String value, int rank) {
          if (value == null) {
              throw new NullPointerException("value");
          }
          this.value.add(rank, value);
      }
  
      public void setValue(String value, int rank) {
          if (value == null) {
              throw new NullPointerException("value");
          }
          this.value.set(rank, value);
      }
  
      @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());
      }
  
      public int compareTo(InterfaceHttpData o) {
          if (!(o instanceof InternalAttribute)) {
              throw new ClassCastException("Cannot compare " + getHttpDataType() +
                      " with " + o.getHttpDataType());
          }
          return compareTo((InternalAttribute) o);
      }
  
      public int compareTo(InternalAttribute o) {
          return getName().compareToIgnoreCase(o.getName());
      }
  
      public int size() {
          int size = 0;
          for (String elt : value) {
              try {
                  size += elt.getBytes(charset.name()).length;
              } catch (UnsupportedEncodingException e) {
                  throw new RuntimeException(e);
              }
          }
          return size;
     }
     @Override
     public String toString() {
         StringBuilder result = new StringBuilder();
         for (String elt : value) {
             result.append(elt);
         }
         return result.toString();
     }
 
     public ChannelBuffer toChannelBuffer() {
         ChannelBuffer[] buffers = new ChannelBuffer[value.size()];
         for (int i = 0; i < buffers.length; i++) {
             buffers[i] = ChannelBuffers.copiedBuffer(value.get(i), charset);
         }
         return ChannelBuffers.wrappedBuffer(buffers);
     }
 
     public String getName() {
         return "InternalAttribute";
     }
 }