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package javax.ws.rs.core;

import java.util.Date;
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 {@link java.lang.IllegalStateException} if called outside the
 * scope of a request (e.g. from a provider constructor).
 *
 * @author Paul Sandoz
 * @author Marc Hadley
 * @see Context
 * @since 1.0
 */
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)}.
     *
     * @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 getRequestHeader(String name);

    /**
     * Get a HTTP header as a single string value.
     * 

* Each single header value is converted to String using a * {@link javax.ws.rs.ext.RuntimeDelegate.HeaderDelegate} if one is available * via {@link javax.ws.rs.ext.RuntimeDelegate#createHeaderDelegate(java.lang.Class)} * for the header value class or using its {@code toString} method if a header * delegate is not available. * * @param name the HTTP header. * @return the HTTP header value. If the HTTP header is not present then * {@code null} is returned. If the HTTP header is present but has no * value then the empty string is returned. If the HTTP header is present * more than once then the values of joined together and separated by a ',' * character. * @see #getRequestHeader(java.lang.String) * @since 2.0 */ public String getHeaderString(String name); /** * Get the values of HTTP request headers. The returned Map is case-insensitive * wrt. keys and is read-only. The method never returns {@code null}. * * @return a read-only map of header names and values. * @throws java.lang.IllegalStateException * if called outside the scope of a request. */ public MultivaluedMap getRequestHeaders(); /** * Get a list of media types that are acceptable for the response. *

* If no acceptable media types are specified, a read-only list containing * a single {@link javax.ws.rs.core.MediaType#WILDCARD_TYPE wildcard media type} * instance is returned. * * @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 getAcceptableMediaTypes(); /** * Get a list of languages that are acceptable for the response. *

* If no acceptable languages are specified, a read-only list containing * a single wildcard {@link java.util.Locale} instance (with language field * set to "{@code *}") is returned. * * @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 getAcceptableLanguages(); /** * Get the media type of the request entity. * * @return the media type or {@code 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 {@code 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 getCookies(); /** * Get message date. * * @return the message date, otherwise {@code null} if not present. * @since 2.0 */ public Date getDate(); /** * Get Content-Length value. * * @return Content-Length as integer if present and valid number. In other * cases returns -1. * @since 2.0 */ public int getLength(); /** * See {@link HTTP/1.1 documentation}. */ public static final String ACCEPT = "Accept"; /** * See {@link HTTP/1.1 documentation}. */ public static final String ACCEPT_CHARSET = "Accept-Charset"; /** * See {@link HTTP/1.1 documentation}. */ public static final String ACCEPT_ENCODING = "Accept-Encoding"; /** * See {@link HTTP/1.1 documentation}. */ public static final String ACCEPT_LANGUAGE = "Accept-Language"; /** * See {@link HTTP/1.1 documentation}. */ public static final String ALLOW = "Allow"; /** * See {@link HTTP/1.1 documentation}. */ public static final String AUTHORIZATION = "Authorization"; /** * See {@link HTTP/1.1 documentation}. */ public static final String CACHE_CONTROL = "Cache-Control"; /** * See {@link IETF RFC-2183}. */ public static final String CONTENT_DISPOSITION = "Content-Disposition"; /** * See {@link HTTP/1.1 documentation}. */ public static final String CONTENT_ENCODING = "Content-Encoding"; /** * See {@link IETF RFC-2392}. */ public static final String CONTENT_ID = "Content-ID"; /** * See {@link HTTP/1.1 documentation}. */ public static final String CONTENT_LANGUAGE = "Content-Language"; /** * See {@link HTTP/1.1 documentation}. */ public static final String CONTENT_LENGTH = "Content-Length"; /** * See {@link HTTP/1.1 documentation}. */ public static final String CONTENT_LOCATION = "Content-Location"; /** * See {@link HTTP/1.1 documentation}. */ public static final String CONTENT_TYPE = "Content-Type"; /** * See {@link HTTP/1.1 documentation}. */ public static final String DATE = "Date"; /** * See {@link HTTP/1.1 documentation}. */ public static final String ETAG = "ETag"; /** * See {@link HTTP/1.1 documentation}. */ public static final String EXPIRES = "Expires"; /** * See {@link HTTP/1.1 documentation}. */ public static final String HOST = "Host"; /** * See {@link HTTP/1.1 documentation}. */ public static final String IF_MATCH = "If-Match"; /** * See {@link HTTP/1.1 documentation}. */ public static final String IF_MODIFIED_SINCE = "If-Modified-Since"; /** * See {@link HTTP/1.1 documentation}. */ public static final String IF_NONE_MATCH = "If-None-Match"; /** * See {@link HTTP/1.1 documentation}. */ public static final String IF_UNMODIFIED_SINCE = "If-Unmodified-Since"; /** * See {@link HTTP/1.1 documentation}. */ public static final String LAST_MODIFIED = "Last-Modified"; /** * See {@link HTTP/1.1 documentation}. */ public static final String LOCATION = "Location"; /** * See {@link Web Linking (IETF RFC-5988) documentation}. */ public static final String LINK = "Link"; /** * See {@link HTTP/1.1 documentation}. */ public static final String RETRY_AFTER = "Retry-After"; /** * See {@link HTTP/1.1 documentation}. */ public static final String USER_AGENT = "User-Agent"; /** * See {@link HTTP/1.1 documentation}. */ public static final String VARY = "Vary"; /** * See {@link HTTP/1.1 documentation}. */ public static final String WWW_AUTHENTICATE = "WWW-Authenticate"; /** * See {@link IETF RFC 2109}. */ public static final String COOKIE = "Cookie"; /** * See {@link IETF RFC 2109}. */ public static final String SET_COOKIE = "Set-Cookie"; }





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