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src/java.net.http/share/classes/java/net/http/HttpHeaders.java
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rev 50983 : [mq]: finalHttpHeaders
rev 50501 : http-client-branch: Merge with default
rev 50451 : 8197564: HTTP Client implementation
Reviewed-by: chegar, dfuchs, michaelm, prappo
Contributed-by: Chris Hegarty <chris.hegarty@oracle.com>, Daniel Fuchs <daniel.fuchs@oracle.com>, Michael McMahon <michael.x.mcmahon@oracle.com>, Pavel Rappo <pavel.rappo@oracle.com>
rev 49299 : http-client-branch: CSR review commet - outboard pre-defined BP/BH/BS
rev 49082 : http-client-branch: revert overzealous use of @linkplain
rev 49074 : http-client-branch: move to standard package and module name
*** 23,88 ****
* questions.
*/
package java.net.http;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import java.util.OptionalLong;
! import static java.util.Collections.emptyList;
! import static java.util.Collections.unmodifiableList;
import static java.util.Objects.requireNonNull;
/**
* A read-only view of a set of HTTP headers.
*
! * <p> An {@code HttpHeaders} is not created directly, but rather returned from
! * an {@link HttpResponse HttpResponse}. Specific HTTP headers can be set for
! * {@linkplain HttpRequest requests} through the one of the request builder's
! * {@link HttpRequest.Builder#header(String, String) headers} methods.
*
* <p> The methods of this class ( that accept a String header name ), and the
! * Map returned by the {@link #map() map} method, operate without regard to
! * case when retrieving the header value.
*
* <p> {@code HttpHeaders} instances are immutable.
*
* @since 11
*/
! public abstract class HttpHeaders {
/**
! * Creates an HttpHeaders.
! */
! protected HttpHeaders() {}
!
! /**
! * Returns an {@link Optional} containing the first value of the given named
! * (and possibly multi-valued) header. If the header is not present, then
! * the returned {@code Optional} is empty.
! *
! * @implSpec
! * The default implementation invokes
! * {@code allValues(name).stream().findFirst()}
*
* @param name the header name
! * @return an {@code Optional<String>} for the first named value
*/
public Optional<String> firstValue(String name) {
return allValues(name).stream().findFirst();
}
/**
! * Returns an {@link OptionalLong} containing the first value of the
! * named header field. If the header is not present, then the Optional is
! * empty. If the header is present but contains a value that does not parse
! * as a {@code Long} value, then an exception is thrown.
! *
! * @implSpec
! * The default implementation invokes
! * {@code allValues(name).stream().mapToLong(Long::valueOf).findFirst()}
*
* @param name the header name
* @return an {@code OptionalLong}
* @throws NumberFormatException if a value is found, but does not parse as
* a Long
--- 23,94 ----
* questions.
*/
package java.net.http;
+ import java.util.ArrayList;
import java.util.List;
+ import java.util.Locale;
import java.util.Map;
import java.util.Optional;
import java.util.OptionalLong;
! import java.util.TreeMap;
! import java.util.TreeSet;
! import java.util.function.BiPredicate;
! import static java.lang.String.CASE_INSENSITIVE_ORDER;
! import static java.util.Collections.unmodifiableMap;
import static java.util.Objects.requireNonNull;
/**
* A read-only view of a set of HTTP headers.
*
! * <p> An {@code HttpHeaders} is not typically created directly, but rather
! * returned from an {@link HttpRequest#headers() HttpRequest} or an
! * {@link HttpResponse#headers() HttpResponse}. Specific HTTP headers can be
! * set for a {@linkplain HttpRequest request} through one of the request
! * builder's {@link HttpRequest.Builder#header(String, String) headers} methods.
*
* <p> The methods of this class ( that accept a String header name ), and the
! * {@code Map} returned by the {@link #map() map} method, operate without regard
! * to case when retrieving the header value(s).
! *
! * <p> An HTTP header name may appear more than once in the HTTP protocol. As
! * such, headers are represented as a name and a list of values. Each occurrence
! * of a header value is added verbatim, to the appropriate header name list,
! * without interpreting its value. In particular, {@code HttpHeaders} does not
! * perform any splitting or joining of comma separated header value strings. The
! * order of elements in a header value list is preserved when {@link
! * HttpRequest.Builder#header(String, String) building} a request. For
! * responses, the order of elements in a header value list is the order in which
! * they were received. The {@code Map} returned by the {@code map} method,
! * however, does not provide any guarantee with regard to the ordering of its
! * entries.
*
* <p> {@code HttpHeaders} instances are immutable.
*
* @since 11
*/
! public final class HttpHeaders {
/**
! * Returns an {@link Optional} containing the first header string value of
! * the given named (and possibly multi-valued) header. If the header is not
! * present, then the returned {@code Optional} is empty.
*
* @param name the header name
! * @return an {@code Optional<String>} containing the first named header
! * string value, if present
*/
public Optional<String> firstValue(String name) {
return allValues(name).stream().findFirst();
}
/**
! * Returns an {@link OptionalLong} containing the first header string value
! * of the named header field. If the header is not present, then the
! * Optional is empty. If the header is present but contains a value that
! * does not parse as a {@code Long} value, then an exception is thrown.
*
* @param name the header name
* @return an {@code OptionalLong}
* @throws NumberFormatException if a value is found, but does not parse as
* a Long
*** 90,124 ****
public OptionalLong firstValueAsLong(String name) {
return allValues(name).stream().mapToLong(Long::valueOf).findFirst();
}
/**
! * Returns an unmodifiable List of all of the values of the given named
! * header. Always returns a List, which may be empty if the header is not
! * present.
! *
! * @implSpec
! * The default implementation invokes, among other things, the
! * {@code map().get(name)} to retrieve the list of header values.
*
* @param name the header name
! * @return a List of String values
*/
public List<String> allValues(String name) {
requireNonNull(name);
List<String> values = map().get(name);
// Making unmodifiable list out of empty in order to make a list which
// throws UOE unconditionally
! return values != null ? values : unmodifiableList(emptyList());
}
/**
* Returns an unmodifiable multi Map view of this HttpHeaders.
*
* @return the Map
*/
! public abstract Map<String, List<String>> map();
/**
* Tests this HTTP headers instance for equality with the given object.
*
* <p> If the given object is not an {@code HttpHeaders} then this
--- 96,128 ----
public OptionalLong firstValueAsLong(String name) {
return allValues(name).stream().mapToLong(Long::valueOf).findFirst();
}
/**
! * Returns an unmodifiable List of all of the header string values of the
! * given named header. Always returns a List, which may be empty if the
! * header is not present.
*
* @param name the header name
! * @return a List of headers string values
*/
public List<String> allValues(String name) {
requireNonNull(name);
List<String> values = map().get(name);
// Making unmodifiable list out of empty in order to make a list which
// throws UOE unconditionally
! return values != null ? values : List.of();
}
/**
* Returns an unmodifiable multi Map view of this HttpHeaders.
*
* @return the Map
*/
! public Map<String,List<String>> map() {
! return headers;
! }
/**
* Tests this HTTP headers instance for equality with the given object.
*
* <p> If the given object is not an {@code HttpHeaders} then this
*** 163,168 ****
--- 167,252 ----
sb.append(super.toString()).append(" { ");
sb.append(map());
sb.append(" }");
return sb.toString();
}
+
+ /**
+ * Returns an HTTP headers from the given map. The given map's key
+ * represents the header name, and its value the list of string header
+ * values for that header name.
+ *
+ * <p> An HTTP header name may appear more than once in the HTTP protocol.
+ * Such, <i>multi-valued</i>, headers must be represented by a single entry
+ * in the given map, whose entry value is a list that represents the
+ * multiple header string values. Leading and trailing whitespaces are
+ * removed from all string values retrieved from the given map and its lists
+ * before processing. Only headers that, after filtering, contain at least
+ * one, possibly empty string, value will be added to the HTTP headers.
+ *
+ * @apiNote The primary purpose of this method is for testing frameworks.
+ * Per-request headers can be set through one of the {@code HttpRequest}
+ * {@link HttpRequest.Builder#header(String, String) headers} methods.
+ *
+ * @param headerMap the map containing the header names and values
+ * @param filter a filter that can be used to inspect each
+ * header-name-and-value pair in the given map to determine if
+ * it should, or should not, be added to the to the HTTP
+ * headers
+ * @return an HTTP headers instance containing the given headers
+ * @throws NullPointerException if any of: {@code headerMap}, a key or value
+ * in the given map, or an entry in the map's value list, or
+ * {@code filter}, is {@code null}
+ * @throws IllegalArgumentException if the given {@code headerMap} contains
+ * any two keys that are equal ( without regard to case ); or if the
+ * given map contains any key whose length, after trimming
+ * whitespaces, is {@code 0}
+ */
+ public static HttpHeaders of(Map<String,List<String>> headerMap,
+ BiPredicate<String,String> filter) {
+ requireNonNull(headerMap);
+ requireNonNull(filter);
+ return headersOf(headerMap, filter);
+ }
+
+ // --
+
+ private static final HttpHeaders NO_HEADERS = new HttpHeaders(Map.of());
+
+ private final Map<String,List<String>> headers;
+
+ private HttpHeaders(Map<String,List<String>> headers) {
+ this.headers = headers;
+ }
+
+ // Returns a new HTTP headers after performing a structural copy and filtering.
+ private static HttpHeaders headersOf(Map<String,List<String>> map,
+ BiPredicate<String,String> filter) {
+ TreeMap<String,List<String>> other = new TreeMap<>(CASE_INSENSITIVE_ORDER);
+ TreeSet<String> notAdded = new TreeSet<>(CASE_INSENSITIVE_ORDER);
+ ArrayList<String> tempList = new ArrayList<>();
+ map.forEach((key, value) -> {
+ String headerName = requireNonNull(key).trim();
+ if (headerName.isEmpty()) {
+ throw new IllegalArgumentException("empty key");
+ }
+ List<String> headerValues = requireNonNull(value);
+ headerValues.forEach(headerValue -> {
+ headerValue = requireNonNull(headerValue).trim();
+ if (filter.test(headerName, headerValue)) {
+ tempList.add(headerValue);
+ }
+ });
+
+ if (tempList.isEmpty()) {
+ if (other.containsKey(headerName)
+ || notAdded.contains(headerName.toLowerCase(Locale.ROOT)))
+ throw new IllegalArgumentException("duplicate key: " + headerName);
+ notAdded.add(headerName.toLowerCase(Locale.ROOT));
+ } else if (other.put(headerName, List.copyOf(tempList)) != null) {
+ throw new IllegalArgumentException("duplicate key: " + headerName);
+ }
+ tempList.clear();
+ });
+ return other.isEmpty() ? NO_HEADERS : new HttpHeaders(unmodifiableMap(other));
+ }
}
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