io.undertow.attribute.PathParameterAttribute 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.attribute;
import java.util.ArrayDeque;
import java.util.Deque;
import io.undertow.server.HttpServerExchange;
/**
* 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 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 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;
}
}
}