io.undertow.predicate.IdempotentPredicate Maven / Gradle / Ivy
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* 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 METHODS;
static {
Set 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());
}
@Override
public String toString() {
return "idempotent()";
}
public static class Builder implements PredicateBuilder {
@Override
public String name() {
return "idempotent";
}
@Override
public Map> parameters() {
return Collections.emptyMap();
}
@Override
public Set requiredParameters() {
return Collections.emptySet();
}
@Override
public String defaultParameter() {
return null;
}
@Override
public Predicate build(Map config) {
return INSTANCE;
}
}
}
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