/*
 * 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.attribute;

import java.util.Map;

import io.undertow.predicate.Predicate;
import io.undertow.server.HttpServerExchange;

Author:Stuart Douglas
/** * @author Stuart Douglas */
public class PredicateContextAttribute implements ExchangeAttribute { private final String name; public PredicateContextAttribute(final String name) { this.name = name; } @Override public String readAttribute(final HttpServerExchange exchange) { Map<String, Object> context = exchange.getAttachment(Predicate.PREDICATE_CONTEXT); if (context != null) { Object object = context.get(name); return object == null ? null : object.toString(); } return null; } @Override public void writeAttribute(final HttpServerExchange exchange, final String newValue) throws ReadOnlyAttributeException { Map<String, Object> context = exchange.getAttachment(Predicate.PREDICATE_CONTEXT); if (context != null) { context.put(name, newValue); } } @Override public String toString() { return "${" + name + "}"; } public static final class Builder implements ExchangeAttributeBuilder { @Override public String name() { return "Predicate context variable"; } @Override public ExchangeAttribute build(final String token) { if (token.startsWith("${") && token.endsWith("}") && token.length() > 3) { return new PredicateContextAttribute(token.substring(2, token.length() - 1)); } else if (token.startsWith("$")) { return new PredicateContextAttribute(token.substring(1, token.length())); } return null; } @Override public int priority() { return 0; } } }