/*
* 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 io.undertow.server.HttpServerExchange;
/**
* Exchange attribute that represents a combination of attributes that should be merged into a single string.
*
* @author Stuart Douglas
*/
public class CompositeExchangeAttribute implements ExchangeAttribute {
private final ExchangeAttribute[] attributes;
public CompositeExchangeAttribute(ExchangeAttribute[] attributes) {
ExchangeAttribute[] copy = new ExchangeAttribute[attributes.length];
System.arraycopy(attributes, 0, copy, 0, attributes.length);
this.attributes = copy;
}
@Override
public String readAttribute(HttpServerExchange exchange) {
final StringBuilder sb = new StringBuilder();
for (int i = 0; i < attributes.length; ++i) {
final String val = attributes[i].readAttribute(exchange);
if(val != null) {
sb.append(val);
}
}
return sb.toString();
}
@Override
public void writeAttribute(HttpServerExchange exchange, String newValue) throws ReadOnlyAttributeException {
throw new ReadOnlyAttributeException("combined", newValue);
}
}