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src/jdk.incubator.httpclient/share/classes/jdk/incubator/http/HttpHeaders.java
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@@ -1,7 +1,7 @@
/*
- * Copyright (c) 2015, 2016, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2015, 2017, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
@@ -27,57 +27,138 @@
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.
* {@Incubating}
*
+ * <p> The methods of this class ( that accept a String header name ), and the
+ * Map returned by the {@linkplain #map() map} method, operate without regard to
+ * case when retrieving the header value.
+ *
+ * <p> HttpHeaders instances are immutable.
+ *
* @since 9
*/
-public interface HttpHeaders {
+public abstract class HttpHeaders {
+
+ /**
+ * Creates an HttpHeaders.
+ */
+ protected HttpHeaders() {}
/**
- * Returns an {@link java.util.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.
+ * 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);
+ public Optional<String> firstValue(String name) {
+ return allValues(name).stream().findFirst();
+ }
/**
- * Returns an {@link java.util.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.
+ * 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
*/
- public OptionalLong firstValueAsLong(String name);
+ 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);
+ 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. This
- * interface should only be used when it is required to iterate over the
- * entire set of headers.
+ * Returns an unmodifiable multi Map view of this HttpHeaders.
*
* @return the Map
*/
- public Map<String,List<String>> 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
+ * method returns {@code false}. Two HTTP headers are equal if each
+ * of their corresponding {@linkplain #map() maps} are equal.
+ *
+ * <p> This method satisfies the general contract of the {@link
+ * Object#equals(Object) Object.equals} method.
+ *
+ * @param obj the object to which this object is to be compared
+ * @return {@code true} if, and only if, the given object is an {@code
+ * HttpHeaders} that is equal to this HTTP headers
+ */
+ public final boolean equals(Object obj) {
+ if (!(obj instanceof HttpHeaders))
+ return false;
+ HttpHeaders that = (HttpHeaders)obj;
+ return this.map().equals(that.map());
+ }
+
+ /**
+ * Computes a hash code for this HTTP headers instance.
+ *
+ * <p> The hash code is based upon the components of the HTTP headers
+ * {@linkplain #map() map}, and satisfies the general contract of the
+ * {@link Object#hashCode Object.hashCode} method.
+ *
+ * @return the hash-code value for this HTTP headers
+ */
+ public final int hashCode() {
+ return map().hashCode();
+ }
+
+ /**
+ * Returns this HTTP headers as a string.
+ *
+ * @return a string describing the HTTP headers
+ */
+ @Override
+ public String toString() {
+ StringBuilder sb = new StringBuilder();
+ sb.append(super.toString()).append(" ");
+ sb.append(map());
+ sb.append(" }");
+ return sb.toString();
+ }
}
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