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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:
    *
    *   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.handler.codec.http.HttpConstants;
  
  import java.io.IOException;
  import java.nio.charset.Charset;
  import java.util.regex.Pattern;
  
  /**
   * Abstract HttpData implementation
   */
  public abstract class AbstractHttpData implements HttpData {
  
      private static final Pattern STRIP_PATTERN = Pattern.compile("(?:^\\s+|\\s+$|\\n)");
      private static final Pattern REPLACE_PATTERN = Pattern.compile("[\\r\\t]");
  
      protected final String name;
      protected long definedSize;
      protected long size;
      protected Charset charset = HttpConstants.DEFAULT_CHARSET;
      protected boolean completed;
      protected long maxSize = DefaultHttpDataFactory.MAXSIZE;
  
      protected AbstractHttpData(String name, Charset charset, long size) {
          if (name == null) {
              throw new NullPointerException("name");
          }
  
          name = REPLACE_PATTERN.matcher(name).replaceAll(" ");
          name = STRIP_PATTERN.matcher(name).replaceAll("");
  
          if (name.length() == 0) {
              throw new IllegalArgumentException("empty name");
          }
  
          this.name = name;
          if (charset != null) {
              setCharset(charset);
          }
          definedSize = size;
      }
  
      public void setMaxSize(long maxSize) {
          this.maxSize = maxSize;
      }
  
      public void checkSize(long newSize) throws IOException {
          if (maxSize >= 0 && newSize > maxSize) {
              throw new IOException("Size exceed allowed maximum capacity");
          }
      }
  
      public String getName() {
          return name;
      }
  
      public boolean isCompleted() {
          return completed;
      }
  
      public Charset getCharset() {
          return charset;
      }
  
      public void setCharset(Charset charset) {
          if (charset == null) {
              throw new NullPointerException("charset");
          }
          this.charset = charset;
      }
  
      public long length() {
          return size;
      }
  }