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   /*
    * 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:
    *
    *   https://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 io.netty.util.internal.ObjectUtil;
  
  import java.io.IOException;
  import java.nio.charset.Charset;
  
  import static io.netty.buffer.Unpooled.*;
  
  /**
   * Memory implementation of Attributes
   */
  public class MemoryAttribute extends AbstractMemoryHttpData implements Attribute {
  
      public MemoryAttribute(String name) {
          this(name, HttpConstants.DEFAULT_CHARSET);
      }
  
      public MemoryAttribute(String name, long definedSize) {
          this(name, definedSize, HttpConstants.DEFAULT_CHARSET);
      }
  
      public MemoryAttribute(String name, Charset charset) {
          super(name, charset, 0);
      }
  
      public MemoryAttribute(String name, long definedSize, Charset charset) {
          super(name, charset, definedSize);
      }
  
      public MemoryAttribute(String name, String value) throws IOException {
          this(name, value, HttpConstants.DEFAULT_CHARSET); // Attribute have no default size
      }
  
      public MemoryAttribute(String name, String value, Charset charset) throws IOException {
          super(name, charset, 0); // Attribute have no default size
          setValue(value);
      }
  
      @Override
      public HttpDataType getHttpDataType() {
          return HttpDataType.Attribute;
      }
  
      @Override
      public String getValue() {
          return getByteBuf().toString(getCharset());
      }
  
      @Override
      public void setValue(String value) throws IOException {
          ObjectUtil.checkNotNull(value, "value");
          byte [] bytes = value.getBytes(getCharset());
          checkSize(bytes.length);
          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();
          try {
              checkSize(size + localsize);
          } catch (IOException e) {
              buffer.release();
              throw e;
          }
          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 other) {
         if (!(other instanceof Attribute)) {
             throw new ClassCastException("Cannot compare " + getHttpDataType() +
                     " with " + other.getHttpDataType());
         }
         return compareTo((Attribute) other);
     }
 
     public int compareTo(Attribute o) {
         return getName().compareToIgnoreCase(o.getName());
     }
 
     @Override
     public String toString() {
         return getName() + '=' + getValue();
     }
 
     @Override
     public Attribute copy() {
         final ByteBuf content = content();
         return replace(content != null ? content.copy() : null);
     }
 
     @Override
     public Attribute duplicate() {
         final ByteBuf content = content();
         return replace(content != null ? content.duplicate() : null);
     }
 
     @Override
     public Attribute retainedDuplicate() {
         ByteBuf content = content();
         if (content != null) {
             content = content.retainedDuplicate();
             boolean success = false;
             try {
                 Attribute duplicate = replace(content);
                 success = true;
                 return duplicate;
             } finally {
                 if (!success) {
                     content.release();
                 }
             }
         } else {
             return replace(null);
         }
     }
 
     @Override
     public Attribute replace(ByteBuf content) {
         MemoryAttribute attr = new MemoryAttribute(getName());
         attr.setCharset(getCharset());
         if (content != null) {
             try {
                 attr.setContent(content);
             } catch (IOException e) {
                 throw new ChannelException(e);
             }
         }
         attr.setCompleted(isCompleted());
         return attr;
     }
 
     @Override
     public Attribute retain() {
         super.retain();
         return this;
     }
 
     @Override
     public Attribute retain(int increment) {
         super.retain(increment);
         return this;
     }
 
     @Override
     public Attribute touch() {
         super.touch();
         return this;
     }
 
     @Override
     public Attribute touch(Object hint) {
         super.touch(hint);
         return this;
     }
 }