/*
    * ====================================================================
    * 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.client.methods;
  
  import java.net.URI;
  
  import org.apache.http.Header;
  import org.apache.http.HttpEntity;
  import org.apache.http.HttpEntityEnclosingRequest;
  import org.apache.http.HttpHost;
  import org.apache.http.HttpRequest;
  import org.apache.http.ProtocolVersion;
  import org.apache.http.RequestLine;
  import org.apache.http.message.AbstractHttpMessage;
  import org.apache.http.message.BasicRequestLine;
  import org.apache.http.params.HttpParams;
  import org.apache.http.protocol.HTTP;
  import org.apache.http.util.Args;
  
  /**
   * A wrapper class for {@link HttpRequest} that can be used to change properties of the current
   * request without modifying the original object.
   *
   * @since 4.3
   */
  @SuppressWarnings("deprecation")
  public class HttpRequestWrapper extends AbstractHttpMessage implements HttpUriRequest {
  
      private final HttpRequest original;
      private final HttpHost target;
      private final String method;
      private RequestLine requestLine;
      private ProtocolVersion version;
      private URI uri;
  
      private HttpRequestWrapper(final HttpRequest request, final HttpHost target) {
          super();
          this.original = Args.notNull(request, "HTTP request");
          this.target = target;
          this.version = this.original.getRequestLine().getProtocolVersion();
          this.method = this.original.getRequestLine().getMethod();
          if (request instanceof HttpUriRequest) {
              this.uri = ((HttpUriRequest) request).getURI();
          } else {
              this.uri = null;
          }
          setHeaders(request.getAllHeaders());
      }
  
      @Override
      public ProtocolVersion getProtocolVersion() {
          return this.version != null ? this.version : this.original.getProtocolVersion();
      }
  
      public void setProtocolVersion(final ProtocolVersion version) {
          this.version = version;
          this.requestLine = null;
      }
  
      @Override
      public URI getURI() {
          return this.uri;
      }
  
      public void setURI(final URI uri) {
          this.uri = uri;
          this.requestLine = null;
      }
  
      @Override
      public String getMethod() {
          return method;
      }
  
     @Override
     public void abort() throws UnsupportedOperationException {
         throw new UnsupportedOperationException();
     }
 
     @Override
     public boolean isAborted() {
         return false;
     }
 
     @Override
     public RequestLine getRequestLine() {
         if (this.requestLine == null) {
             String requestUri;
             if (this.uri != null) {
                 requestUri = this.uri.toASCIIString();
             } else {
                 requestUri = this.original.getRequestLine().getUri();
             }
             if (requestUri == null || requestUri.isEmpty()) {
                 requestUri = "/";
             }
             this.requestLine = new BasicRequestLine(this.method, requestUri, getProtocolVersion());
         }
         return this.requestLine;
     }
 
     public HttpRequest getOriginal() {
         return this.original;
     }
 
     /**
      * @since 4.4
      */
     public HttpHost getTarget() {
         return target;
     }
 
     @Override
     public String toString() {
         return getRequestLine() + " " + this.headergroup;
     }
 
     static class HttpEntityEnclosingRequestWrapper extends HttpRequestWrapper
         implements HttpEntityEnclosingRequest {
 
         private HttpEntity entity;
 
         HttpEntityEnclosingRequestWrapper(final HttpEntityEnclosingRequest request, final HttpHost target) {
             super(request, target);
             this.entity = request.getEntity();
         }
 
         @Override
         public HttpEntity getEntity() {
             return this.entity;
         }
 
         @Override
         public void setEntity(final HttpEntity entity) {
             this.entity = entity;
         }
 
         @Override
         public boolean expectContinue() {
             final Header expect = getFirstHeader(HTTP.EXPECT_DIRECTIVE);
             return expect != null && HTTP.EXPECT_CONTINUE.equalsIgnoreCase(expect.getValue());
         }
 
     }
 
     /**
      * Creates a mutable wrapper of the original request.
      *
      * @param request original request
      * @return mutable request wrappering the original one
      */
     public static HttpRequestWrapper wrap(final HttpRequest request) {
         return wrap(request, null);
     }
 
 
     /**
      * Creates a mutable wrapper of the original request.
      *
      * @param request original request
      * @param target original target, if explicitly specified
      * @return mutable request wrappering the original one
      * @since 4.4
      */
     public static HttpRequestWrapper wrap(final HttpRequest request, final HttpHost target) {
         Args.notNull(request, "HTTP request");
         return request instanceof HttpEntityEnclosingRequest
                         ? new HttpEntityEnclosingRequestWrapper(
                                         (HttpEntityEnclosingRequest) request, target)
                         : new HttpRequestWrapper(request, target);
     }
 
     /**
      * @deprecated (4.3) use
      *   {@link org.apache.http.client.config.RequestConfig}.
      */
     @Override
     @Deprecated
     public HttpParams getParams() {
         if (this.params == null) {
             this.params = original.getParams().copy();
         }
         return this.params;
     }
 
 }