/*
* $HeadURL: http://svn.apache.org/repos/asf/httpcomponents/httpcore/trunk/module-main/src/main/java/org/apache/http/HttpMessage.java $
* $Revision: 610823 $
* $Date: 2008-01-10 07:53:53 -0800 (Thu, 10 Jan 2008) $
*
* ====================================================================
* 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;
import org.apache.http.params.HttpParams;
/**
* A generic HTTP message.
* Holds what is common between requests and responses.
*
* @author <a href="mailto:oleg at ural.ru">Oleg Kalnichevski</a>
*
* @version $Revision: 610823 $
*
* @since 4.0
*/
public interface HttpMessage {
/**
* Returns the protocol version this message is compatible with.
*/
ProtocolVersion getProtocolVersion();
/**
* Checks if a certain header is present in this message. Header values are
* ignored.
*
* @param name the header name to check for.
* @return true if at least one header with this name is present.
*/
boolean containsHeader(String name);
/**
* Returns all the headers with a specified name of this message. Header values
* are ignored. Headers are orderd in the sequence they will be sent over a
* connection.
*
* @param name the name of the headers to return.
* @return the headers whose name property equals <code>name</code>.
*/
Header[] getHeaders(String name);
/**
* Returns the first header with a specified name of this message. Header
* values are ignored. If there is more than one matching header in the
* message the first element of {@link #getHeaders(String)} is returned.
* If there is no matching header in the message <code>null</code> is
* returned.
*
* @param name the name of the header to return.
* @return the first header whose name property equals <code>name</code>
* or <code>null</code> if no such header could be found.
*/
Header getFirstHeader(String name);
/**
* Returns the last header with a specified name of this message. Header values
* are ignored. If there is more than one matching header in the message the
* last element of {@link #getHeaders(String)} is returned. If there is no
* matching header in the message <code>null</code> is returned.
*
* @param name the name of the header to return.
* @return the last header whose name property equals <code>name</code>.
* or <code>null</code> if no such header could be found.
*/
Header getLastHeader(String name);
/**
* Returns all the headers of this message. Headers are orderd in the sequence
* they will be sent over a connection.
*
* @return all the headers of this message
*/
Header[] getAllHeaders();
/**
* Adds a header to this message. The header will be appended to the end of
* the list.
*
* @param header the header to append.
*/
void addHeader(Header header);
/**
* Adds a header to this message. The header will be appended to the end of
* the list.
*
* @param name the name of the header.
* @param value the value of the header.
*/
void addHeader(String name, String value);
/**
* Overwrites the first header with the same name. The new header will be appended to
* the end of the list, if no header with the given name can be found.
*
* @param header the header to set.
*/
void setHeader(Header header);
/**
* Overwrites the first header with the same name. The new header will be appended to
* the end of the list, if no header with the given name can be found.
*
* @param name the name of the header.
* @param value the value of the header.
*/
void setHeader(String name, String value);
/**
* Overwrites all the headers in the message.
*
* @param headers the array of headers to set.
*/
void setHeaders(Header[] headers);
/**
* Removes a header from this message.
*
* @param header the header to remove.
*/
void removeHeader(Header header);
/**
* Removes all headers with a certain name from this message.
*
* @param name The name of the headers to remove.
*/
void removeHeaders(String name);
/**
* Returns an iterator of all the headers.
*
* @return Iterator that returns Header objects in the sequence they are
* sent over a connection.
*/
HeaderIterator headerIterator();
/**
* Returns an iterator of the headers with a given name.
*
* @param name the name of the headers over which to iterate, or
* <code>null</code> for all headers
*
* @return Iterator that returns Header objects with the argument name
* in the sequence they are sent over a connection.
*/
HeaderIterator headerIterator(String name);
/**
* Returns the parameters effective for this message as set by
* {@link #setParams(HttpParams)}.
*/
HttpParams getParams();
/**
* Provides parameters to be used for the processing of this message.
* @param params the parameters
*/
void setParams(HttpParams params);
}
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