/* * 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.Collections; import java.util.HashSet; import java.util.Map; import java.util.Set; import io.undertow.server.HttpServerExchange; import io.undertow.util.HttpString; import io.undertow.util.Methods; /** * A predicate that returns true if the request is idempotent * according to the HTTP RFC. * * @author Stuart Douglas */ public class IdempotentPredicate implements Predicate { public static final IdempotentPredicate INSTANCE = new IdempotentPredicate(); private static final Set<HttpString> METHODS; static { Set<HttpString> methods = new HashSet<>(); methods.add(Methods.GET); methods.add(Methods.DELETE); methods.add(Methods.PUT); methods.add(Methods.HEAD); methods.add(Methods.OPTIONS); METHODS = Collections.unmodifiableSet(methods); } @Override public boolean resolve(HttpServerExchange value) { return METHODS.contains(value.getRequestMethod()); } public static class Builder implements PredicateBuilder { @Override public String name() { return "idempotent"; } @Override public Map<String, Class<?>> parameters() { return Collections.emptyMap(); } @Override public Set<String> requiredParameters() { return Collections.emptySet(); } @Override public String defaultParameter() { return null; } @Override public Predicate build(Map<String, Object> config) { return INSTANCE; } } }