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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,
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 *  See the License for the specific language governing permissions and
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package io.undertow.attribute;

import java.util.ArrayDeque;
import java.util.Deque;

import io.undertow.server.HttpServerExchange;

Path parameter
Author:Stuart Douglas
/** * Path parameter * * @author Stuart Douglas */
public class PathParameterAttribute implements ExchangeAttribute { private final String parameter; public PathParameterAttribute(String parameter) { this.parameter = parameter; } @Override public String readAttribute(final HttpServerExchange exchange) { Deque<String> res = exchange.getPathParameters().get(parameter); if(res == null) { return null; }else if(res.isEmpty()) { return ""; } else if(res.size() ==1) { return res.getFirst(); } else { StringBuilder sb = new StringBuilder("["); int i = 0; for(String s : res) { sb.append(s); if(++i != res.size()) { sb.append(", "); } } sb.append("]"); return sb.toString(); } } @Override public void writeAttribute(final HttpServerExchange exchange, final String newValue) throws ReadOnlyAttributeException { final ArrayDeque<String> value = new ArrayDeque<>(); value.add(newValue); exchange.getPathParameters().put(parameter, value); } public static final class Builder implements ExchangeAttributeBuilder { @Override public String name() { return "Path Parameter"; } @Override public ExchangeAttribute build(final String token) { if (token.startsWith("%{p,") && token.endsWith("}")) { final String qp = token.substring(4, token.length() - 1); return new PathParameterAttribute(qp); } return null; } @Override public int priority() { return 0; } } }