/*
* Copyright 2002-2014 the original author or authors.
*
* 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 org.springframework.integration.router;
import java.util.Collections;
import java.util.List;
import org.springframework.messaging.Message;
import org.springframework.util.Assert;
import org.springframework.util.StringUtils;
/**
* A Message Router that resolves the MessageChannel from a header value.
*
* @author Oleg Zhurakousky
* @author Mark Fisher
* @since 1.0.3
*/
public class HeaderValueRouter extends AbstractMappingMessageRouter {
private final String headerName;
/**
* Create a router that uses the provided header name to lookup a channel.
*
* @param headerName The header name.
*/
public HeaderValueRouter(String headerName) {
Assert.notNull(headerName, "'headerName' must not be null");
this.headerName = headerName;
}
@Override
protected List<Object> getChannelKeys(Message<?> message) {
Object value = message.getHeaders().get(this.headerName);
if (value instanceof String && ((String) value).indexOf(',') != -1) {
value = StringUtils.tokenizeToStringArray((String) value, ",");
}
return Collections.singletonList(value);
}
}