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/*
 * HttpHeaders.java
 *
 * Created on April 13, 2007, 3:00 PM
 *
 */

package javax.ws.rs.core;

import java.util.List;
import java.util.Locale;
import java.util.Map;

/**
 * An injectable interface that provides access to HTTP header information.
 * All methods throw java.lang.IllegalStateException if called outside the scope of a request
 * (e.g. from a provider constructor).
 * @see Context
 */
public interface HttpHeaders {
    
    /**
     * Get the values of a HTTP request header. The returned List is read-only.
     * This is a shortcut for <code>getRequestHeaders().get(name)</code>.
     * @param name the header name, case insensitive
     * @return a read-only list of header values.
     * @throws java.lang.IllegalStateException if called outside the scope of a request
     */
    public List<String> getRequestHeader(String name);

    /**
     * Get the values of HTTP request headers. The returned Map is case-insensitive
     * wrt keys and is read-only.
     * @return a read-only map of header names and values.
     * @throws java.lang.IllegalStateException if called outside the scope of a request
     */
    public MultivaluedMap<String, String> getRequestHeaders();

    /**
     * Get a list of media types that are acceptable for the response.
     * @return a read-only list of requested response media types sorted according
     * to their q-value, with highest preference first.
     * @throws java.lang.IllegalStateException if called outside the scope of a request
     */
    public List<MediaType> getAcceptableMediaTypes();
    
    /**
     * Get a list of languages that are acceptable for the response.
     * @return a read-only list of acceptable languages sorted according
     * to their q-value, with highest preference first.
     * @throws java.lang.IllegalStateException if called outside the scope of a request
     */
    public List<Locale> getAcceptableLanguages();
    
    /**
     * Get the media type of the request entity
     * @return the media type or null if there is no request entity.
     * @throws java.lang.IllegalStateException if called outside the scope of a request
     */
    public MediaType getMediaType();
    
    /**
     * Get the language of the request entity
     * @return the language of the entity or null if not specified
     * @throws java.lang.IllegalStateException if called outside the scope of a request
     */
    public Locale getLanguage();

    /**
     * Get any cookies that accompanied the request.
     * @return a read-only map of cookie name (String) to Cookie.
     * @throws java.lang.IllegalStateException if called outside the scope of a request
     */
    public Map<String, Cookie> getCookies();
    
    /**
     * See {@link <a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.1">HTTP/1.1 documentation</a>}.
     */
    public static final String ACCEPT = "Accept";
    
    /**
     * See {@link <a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.2">HTTP/1.1 documentation</a>}.
     */
    public static final String ACCEPT_CHARSET = "Accept-Charset";
    
    /**
     * See {@link <a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.3">HTTP/1.1 documentation</a>}.
     */
    public static final String ACCEPT_ENCODING = "Accept-Encoding";
    
    /**
     * See {@link <a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.4">HTTP/1.1 documentation</a>}.
     */
    public static final String ACCEPT_LANGUAGE = "Accept-Language";
    
    /**
     * See {@link <a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.8">HTTP/1.1 documentation</a>}.
     */
    public static final String AUTHORIZATION = "Authorization";
    
    /**
     * See {@link <a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.9">HTTP/1.1 documentation</a>}.
     */
    public static final String CACHE_CONTROL = "Cache-Control";
    
    /**
     * See {@link <a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.11">HTTP/1.1 documentation</a>}.
     */
    public static final String CONTENT_ENCODING = "Content-Encoding";
    
    /**
     * See {@link <a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.12">HTTP/1.1 documentation</a>}.
     */
    public static final String CONTENT_LANGUAGE = "Content-Language";
    
    /**
     * See {@link <a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.13">HTTP/1.1 documentation</a>}.
     */
    public static final String CONTENT_LENGTH = "Content-Length";
    
    /**
     * See {@link <a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.14">HTTP/1.1 documentation</a>}.
     */
    public static final String CONTENT_LOCATION = "Content-Location";
    
    /**
     * See {@link <a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.17">HTTP/1.1 documentation</a>}.
     */
    public static final String CONTENT_TYPE = "Content-Type";
    
    /**
     * See {@link <a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.18">HTTP/1.1 documentation</a>}.
     */
    public static final String DATE = "Date";
    
    /**
     * See {@link <a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.19">HTTP/1.1 documentation</a>}.
     */
    public static final String ETAG = "ETag";
    
    /**
     * See {@link <a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.21">HTTP/1.1 documentation</a>}.
     */
    public static final String EXPIRES = "Expires";
    
    /**
     * See {@link <a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.23">HTTP/1.1 documentation</a>}.
     */
    public static final String HOST = "Host";
    
    /**
     * See {@link <a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.24">HTTP/1.1 documentation</a>}.
     */
    public static final String IF_MATCH = "If-Match";
    
    /**
     * See {@link <a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.25">HTTP/1.1 documentation</a>}.
     */
    public static final String IF_MODIFIED_SINCE = "If-Modified-Since";
    
    /**
     * See {@link <a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.26">HTTP/1.1 documentation</a>}.
     */
    public static final String IF_NONE_MATCH = "If-None-Match";
    
    /**
     * See {@link <a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.28">HTTP/1.1 documentation</a>}.
     */
    public static final String IF_UNMODIFIED_SINCE = "If-Unmodified-Since";
    
    /**
     * See {@link <a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.29">HTTP/1.1 documentation</a>}.
     */
    public static final String LAST_MODIFIED = "Last-Modified";
    
    /**
     * See {@link <a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.30">HTTP/1.1 documentation</a>}.
     */
    public static final String LOCATION = "Location";
    
    /**
     * See {@link <a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.43">HTTP/1.1 documentation</a>}.
     */
    public static final String USER_AGENT = "User-Agent";
    
    /**
     * See {@link <a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.44">HTTP/1.1 documentation</a>}.
     */
    public static final String VARY = "Vary";
    
    /**
     * See {@link <a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.47">HTTP/1.1 documentation</a>}.
     */
    public static final String WWW_AUTHENTICATE = "WWW-Authenticate";
    
    /**
     * See {@link <a href="http://www.ietf.org/rfc/rfc2109.txt">IETF RFC 2109</a>}.
     */
    public static final String COOKIE = "Cookie";
    
    /**
     * See {@link <a href="http://www.ietf.org/rfc/rfc2109.txt">IETF RFC 2109</a>}.
     */
    public static final String SET_COOKIE = "Set-Cookie";
    
}