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org.dbflute.remoteapi.http.header.ResponseHeaderProvider Maven / Gradle / Ivy
/*
* Copyright 2015-2020 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.dbflute.remoteapi.http.header;
import java.util.Collections;
import java.util.List;
import java.util.Optional;
import java.util.stream.Collectors;
import org.dbflute.optional.OptionalThing;
/**
* @author jflute
* @since 0.4.3 (2019/03/13 Wednesday)
*/
public class ResponseHeaderProvider {
// ===================================================================================
// Attribute
// =========
protected final List responseHeaderList; // not null
// ===================================================================================
// Constructor
// ===========
public ResponseHeaderProvider(List headerList) {
this.responseHeaderList = headerList;
}
// ===================================================================================
// Finder
// ======
/**
* Find the list of header value, which is existing-value only.
* @param headerName The header name to search header value as case-insensitive. (NotNull)
* @return The optional value of found header. (NotNull, EmptyAllowed)
*/
public OptionalThing findPresentFirstValue(String headerName) {
if (headerName == null) {
throw new IllegalArgumentException("The argument 'headerName' should not be null.");
}
final Optional first = responseHeaderList.stream()
.filter(header -> matchesByName(header, headerName))
.filter(header -> isPresentValue(header)) // value-existing only
.map(header -> extractValue(header))
.findFirst();
return OptionalThing.migratedFrom(first, () -> {
throw new IllegalStateException("Not found the header value: headerName=" + headerName);
});
}
/**
* Find the list of header value, which is existing-value only.
* @param headerName The header name to search header value as case-insensitive. (NotNull)
* @return The read-only list of found header value. (NotNull, EmptyAllowed)
*/
public List findPresentValueList(String headerName) {
if (headerName == null) {
throw new IllegalArgumentException("The argument 'headerName' should not be null.");
}
return responseHeaderList.stream()
.filter(header -> matchesByName(header, headerName))
.filter(header -> isPresentValue(header)) // value-existing only
.map(header -> extractValue(header))
.collect(Collectors.toList());
}
protected boolean matchesByName(ResponseHeader header, String headerName) {
return header.getName().equalsIgnoreCase(headerName); // header should be case-insensitive
}
protected boolean isPresentValue(ResponseHeader header) {
return header.getValue().isPresent();
}
protected String extractValue(ResponseHeader header) {
return header.getValue().get();
}
// ===================================================================================
// Accessor
// ========
public List getResponseHeaderList() { // read-only
return Collections.unmodifiableList(responseHeaderList);
}
}
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