org.apache.juneau.rest.vars.RequestAttributeVar Maven / Gradle / Ivy
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package org.apache.juneau.rest.vars;
import static org.apache.juneau.internal.StringUtils.*;
import javax.servlet.http.*;
import org.apache.juneau.rest.*;
import org.apache.juneau.svl.*;
/**
* Request attribute variable resolver.
*
*
* The format for this var is "$RA{key1[,key2...]}" .
*
*
* Used to resolve values returned by {@link HttpServletRequest#getAttribute(String)}.
*
When multiple keys are used, returns the first non-null/empty value.
*
*
Example:
*
* String foo = restRequest.resolveVars("$RA{foo}" );
* String fooOrBar = restRequest.resolveVars("$RA{foo,bar}" );
*
*
* Notes:
*
* -
* This variable resolver requires that a {@link RestRequest} object be set as a context object on the resolver
* or a session object on the resolver session.
*
-
* For security reasons, nested and recursive variables are not resolved.
*
*
* See Also:
*
* - {@doc juneau-rest-server.SvlVariables}
*
*/
public class RequestAttributeVar extends MultipartResolvingVar {
/**
* The name of the session or context object that identifies the {@link RestRequest} object.
*/
public static final String SESSION_req = "req";
/** The name of this variable. */
public static final String NAME = "RA";
/**
* Constructor.
*/
public RequestAttributeVar() {
super(NAME);
}
@Override /* Var */
protected boolean allowNested() {
return false;
}
@Override /* Var */
protected boolean allowRecurse() {
return false;
}
@Override /* Parameter */
public String resolve(VarResolverSession session, String key) {
RestRequest req = session.getSessionObject(RestRequest.class, SESSION_req, true);
return asString(req.getAttribute(key));
}
}