/*
    * ====================================================================
    * Licensed to the Apache Software Foundation (ASF) under one
    * or more contributor license agreements.  See the NOTICE file
    * distributed with this work for additional information
    * regarding copyright ownership.  The ASF 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.
   * ====================================================================
   *
   * This software consists of voluntary contributions made by many
   * individuals on behalf of the Apache Software Foundation.  For more
   * information on the Apache Software Foundation, please see
   * <http://www.apache.org/>.
   *
   */
  
  package org.apache.http.impl.client;
  
  import java.net.URI;
  import java.net.URISyntaxException;
  
  import org.apache.http.annotation.NotThreadSafe;
  
  import org.apache.http.HttpRequest;
  import org.apache.http.ProtocolException;
  import org.apache.http.ProtocolVersion;
  import org.apache.http.RequestLine;
  import org.apache.http.client.methods.HttpUriRequest;
  import org.apache.http.message.AbstractHttpMessage;
  import org.apache.http.message.BasicRequestLine;
  import org.apache.http.params.HttpProtocolParams;
  
  /**
   * A wrapper class for {@link HttpRequest}s that can be used to change
   * properties of the current request without modifying the original
   * object.
   * </p>
   * This class is also capable of resetting the request headers to
   * the state of the original request.
   *
   *
   * @since 4.0
   */
  @NotThreadSafe
  public class RequestWrapper extends AbstractHttpMessage implements HttpUriRequest {
  
      private final HttpRequest original;
  
      private URI uri;
      private String method;
      private ProtocolVersion version;
      private int execCount;
  
      public RequestWrapper(final HttpRequest request) throws ProtocolException {
          super();
          if (request == null) {
              throw new IllegalArgumentException("HTTP request may not be null");
          }
          this.original = request;
          setParams(request.getParams());
          setHeaders(request.getAllHeaders());
          // Make a copy of the original URI
          if (request instanceof HttpUriRequest) {
              this.uri = ((HttpUriRequest) request).getURI();
              this.method = ((HttpUriRequest) request).getMethod();
              this.version = null;
          } else {
              RequestLine requestLine = request.getRequestLine();
              try {
                  this.uri = new URI(requestLine.getUri());
              } catch (URISyntaxException ex) {
                  throw new ProtocolException("Invalid request URI: "
                          + requestLine.getUri(), ex);
              }
              this.method = requestLine.getMethod();
              this.version = request.getProtocolVersion();
          }
          this.execCount = 0;
      }
  
      public void resetHeaders() {
          // Make a copy of original headers
          this.headergroup.clear();
          setHeaders(this.original.getAllHeaders());
      }
  
      public String getMethod() {
          return this.method;
     }
 
     public void setMethod(final String method) {
         if (method == null) {
             throw new IllegalArgumentException("Method name may not be null");
         }
         this.method = method;
     }
 
     public ProtocolVersion getProtocolVersion() {
         if (this.version == null) {
             this.version = HttpProtocolParams.getVersion(getParams());
         }
         return this.version;
     }
 
     public void setProtocolVersion(final ProtocolVersion version) {
         this.version = version;
     }
 
 
     public URI getURI() {
         return this.uri;
     }
 
     public void setURI(final URI uri) {
         this.uri = uri;
     }
 
     public RequestLine getRequestLine() {
         String method = getMethod();
         ProtocolVersion ver = getProtocolVersion();
         String uritext = null;
         if (uri != null) {
             uritext = uri.toASCIIString();
         }
         if (uritext == null || uritext.length() == 0) {
             uritext = "/";
         }
         return new BasicRequestLine(method, uritext, ver);
     }
 
     public void abort() throws UnsupportedOperationException {
         throw new UnsupportedOperationException();
     }
 
     public boolean isAborted() {
         return false;
     }
 
     public HttpRequest getOriginal() {
         return this.original;
     }
 
     public boolean isRepeatable() {
         return true;
     }
 
     public int getExecCount() {
         return this.execCount;
     }
 
     public void incrementExecCount() {
         this.execCount++;
     }
 
 }