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/*
* Copyright © 2016-2018 European Support Limited
*
* 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.openecomp.sdc.logging.servlet;
import java.util.function.Function;
/**
* Handles any of possible header names to read a value for that header. This is useful for backward compatibility, if
* multiple headers may have the same meaning. For instance, when requests come from multiple service, some using an old
* header and others using a new header to pass the same information.
*
* @author evitaliy
* @since 25 Mar 2018
*/
public class HttpHeader {
private final String[] keys;
public HttpHeader(String... keys) {
this.keys = keys;
}
/**
* Returns the value of any of the possible headers.
*
* @param reader function for reading an HTTP header.
* @return value or null if not found
*/
public String getAny(Function<String, String> reader) {
for (String k : keys) {
String value = reader.apply(k);
if (value != null) {
return value;
}
}
return null;
}
}
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