/*
* JBoss, Home of Professional Open Source.
* Copyright 2014 Red Hat, Inc., and individual contributors
* as indicated by the @author tags.
*
* Licensed 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.
*/
package io.undertow.predicate;
import java.util.Map;
import io.undertow.server.HttpServerExchange;
import io.undertow.util.AttachmentKey;
/**
* A predicate.
*
* This is mainly uses by handlers as a way to decide if a request should have certain
* processing applied, based on the given conditions.
*
* @author Stuart Douglas
*/
public interface Predicate {
/**
* Attachment key that can be used to store additional predicate context that allows the predicates to store
* additional information. For example a predicate that matches on a regular expression can place additional
* information about match groups into the predicate context.
*
* Predicates must not rely on this attachment being present, it will only be present if the predicate is being
* used in a situation where this information may be required by later handlers.
*
*/
AttachmentKey<Map<String, Object>> PREDICATE_CONTEXT = AttachmentKey.create(Map.class);
boolean resolve(final HttpServerExchange value);
}