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package com.sun.jersey.api.container.filter;
import com.sun.jersey.spi.container.ContainerRequest;
import com.sun.jersey.spi.container.ContainerRequestFilter;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.PathSegment;
/**
* A URI-based content negotiation filter mapping a dot-declared suffix in
* URI to media type that is the value of the <code>Accept</code> header
* or a language that is the value of the <code>Accept-Language</code> header.
* <p>
* This filter may be used when the accetable media type and acceptable
* language need to be declared in the URI.
* <p>
* This class may be extended to declare the mappings and the extending class,
* <code>foo.MyUriConnegFilter</code> say, can be registered as a container request
* filter. When an application is deployed as a Servlet or Filter such a filter
* can be registered using the following initialization parameters:
* <blockquote><pre>
* <init-param>
* <param-name>com.sun.jersey.spi.container.ContainerRequestFilters</param-name>
* <param-value>foo.MyUriConnegFilter</param-value>
* </init-param>
* </pre></blockquote>
* <p>
* If a suffix of "atom" is regstered with a media type of
* "application/atom+xml" then a GET request of:
* <pre>GET /resource.atom</pre>
* <p>is transformed to:</p>
* <pre>GET /resource
*Accept: application/atom+xml</pre>
* Any existing "Accept" header value will be replaced.
* <p>
* If a suffix of "english: is regstered with a language of
* "en" then a GET request of:
* <pre>GET /resource.english</pre>
* <p>is transformed to:</p>
* <pre>GET /resource
*Accept-Language: en</pre>
* Any existing "Accept-Language"header value will be replaced.
* <p>
* The media type mappings are processed before the language type mappings.
*
* @author Paul.Sandoz@Sun.Com
* @see com.sun.jersey.api.container.filter
*/
public class UriConnegFilter implements ContainerRequestFilter {
private final Map<String, MediaType> mediaExtentions;
private final Map<String, String> languageExtentions;
/**
* Create a filter with suffix to media type mappings.
*
* @param mediaExtentions the suffix to media type mappings.
*/
public UriConnegFilter(Map<String, MediaType> mediaExtentions) {
if (mediaExtentions == null)
throw new IllegalArgumentException();
this.mediaExtentions = mediaExtentions;
this.languageExtentions = Collections.emptyMap();
}
/**
* Create a filter with suffix to media type mappings and suffix to
* langauge mappings.
*
* @param mediaExtentions the suffix to media type mappings.
* @param languageExtentions the syffix to language mappings.
*/
public UriConnegFilter(Map<String, MediaType> mediaExtentions, Map<String, String> languageExtentions) {
if (mediaExtentions == null)
throw new IllegalArgumentException();
if (languageExtentions == null)
throw new IllegalArgumentException();
this.mediaExtentions = mediaExtentions;
this.languageExtentions = languageExtentions;
}
public ContainerRequest filter(ContainerRequest request) {
// Quick check for a '.' character
String path = request.getRequestUri().getRawPath();
if (path.indexOf('.') == -1)
return request;
List<PathSegment> l = request.getPathSegments(false);
if (l.isEmpty())
return request;
// Get the last non-empty path segment
PathSegment segment = null;
for (int i = l.size() - 1; i >= 0; i--) {
segment = l.get(i);
if (segment.getPath().length() > 0)
break;
}
if (segment == null)
return request;
final int length = path.length();
// Get the suffixes
final String[] suffixes = segment.getPath().split("\\.");
for (int i = suffixes.length - 1; i >= 1; i--) {
final String suffix = suffixes[i];
if (suffix.length() == 0)
continue;
final MediaType accept = mediaExtentions.get(suffix);
if (accept != null) {
request.getRequestHeaders().putSingle("Accept", accept.toString());
final int index = path.lastIndexOf('.' + suffix);
path = new StringBuilder(path).delete(index, index + suffix.length() + 1).toString();
suffixes[i] = "";
break;
}
}
for (int i = suffixes.length - 1; i >= 1; i--) {
final String suffix = suffixes[i];
if (suffix.length() == 0)
continue;
final String acceptLanguage = languageExtentions.get(suffix);
if (acceptLanguage != null) {
request.getRequestHeaders().putSingle("Accept-Language", acceptLanguage);
final int index = path.lastIndexOf('.' + suffix);
path = new StringBuilder(path).delete(index, index + suffix.length() + 1).toString();
suffixes[i] = "";
break;
}
}
if (length != path.length()) {
request.setUris(
request.getBaseUri(),
request.getRequestUriBuilder().replacePath(path).build());
}
return request;
}
}