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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.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Objects;
import java.util.Optional;
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 static final String NAMES_CANNOT_BE_NULL = "Names cannot be null";
private static final String AT_LEAST_ONE_NAME_REQUIRED = "At least one name required";
private final List<String> headerNames;
/**
* Receives a list of accepted header names as a String array.
*
* @param headerNames cannot be null or empty
*/
public HttpHeader(String... headerNames) {
if (Objects.requireNonNull(headerNames, NAMES_CANNOT_BE_NULL).length < 1) {
throw new IllegalArgumentException(AT_LEAST_ONE_NAME_REQUIRED);
}
this.headerNames = Arrays.asList(headerNames);
}
/**
* Receives a list of accepted header names as a list of String.
*
* @param headerNames cannot be null or empty
*/
public HttpHeader(List<String> headerNames) {
if (Objects.requireNonNull(headerNames, NAMES_CANNOT_BE_NULL).isEmpty()) {
throw new IllegalArgumentException(AT_LEAST_ONE_NAME_REQUIRED);
}
this.headerNames = new ArrayList<>(headerNames);
}
/**
* Returns the value of any of the possible headers.
*
* @param reader function for reading an HTTP header.
* @return value or empty if not found
*/
public Optional<String> getAny(Function<String, String> reader) {
for (String k : headerNames) {
String value = reader.apply(k);
if (value != null) {
return Optional.of(value);
}
}
return Optional.empty();
}
@Override
public boolean equals(Object o) {
if (this == o) {
return true;
}
if (o == null || getClass() != o.getClass()) {
return false;
}
HttpHeader that = (HttpHeader) o;
return Objects.equals(headerNames, that.headerNames);
}
@Override
public int hashCode() {
return Objects.hash(headerNames);
}
@Override
public String toString() {
return "HttpHeader{headerNames=" + headerNames + '}';
}
}
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