/*
* Copyright 2012 The Netty Project
*
* The Netty Project licenses this file to you 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.jboss.netty.handler.codec.spdy;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.TreeSet;
import org.jboss.netty.handler.codec.http.HttpMethod;
import org.jboss.netty.handler.codec.http.HttpResponseStatus;
import org.jboss.netty.handler.codec.http.HttpVersion;
/**
* Provides the constants for the standard SPDY HTTP header names and commonly
* used utility methods that access an {@link SpdyHeaderBlock}.
* @apiviz.stereotype static
*/
public class SpdyHeaders {
/**
* SPDY HTTP header names
* @apiviz.stereotype static
*/
public static final class HttpNames {
/**
* {@code "method"}
*/
public static final String METHOD = "method";
/**
* {@code "scheme"}
*/
public static final String SCHEME = "scheme";
/**
* {@code "status"}
*/
public static final String STATUS = "status";
/**
* {@code "url"}
*/
public static final String URL = "url";
/**
* {@code "version"}
*/
public static final String VERSION = "version";
private HttpNames() {
super();
}
}
/**
* Returns the header value with the specified header name. If there are
* more than one header value for the specified header name, the first
* value is returned.
*
* @return the header value or {@code null} if there is no such header
*/
public static String getHeader(SpdyHeaderBlock block, String name) {
return block.getHeader(name);
}
/**
* Returns the header value with the specified header name. If there are
* more than one header value for the specified header name, the first
* value is returned.
*
* @return the header value or the {@code defaultValue} if there is no such
* header
*/
public static String getHeader(SpdyHeaderBlock block, String name, String defaultValue) {
String value = block.getHeader(name);
if (value == null) {
return defaultValue;
}
return value;
}
/**
* Sets a new header with the specified name and value. If there is an
* existing header with the same name, the existing header is removed.
*/
public static void setHeader(SpdyHeaderBlock block, String name, Object value) {
block.setHeader(name, value);
}
/**
* Sets a new header with the specified name and values. If there is an
* existing header with the same name, the existing header is removed.
*/
public static void setHeader(SpdyHeaderBlock block, String name, Iterable<?> values) {
block.setHeader(name, values);
}
/**
* Adds a new header with the specified name and value.
*/
public static void addHeader(SpdyHeaderBlock block, String name, Object value) {
block.addHeader(name, value);
}
/**
* Removes the {@code "method"} header.
*/
public static void removeMethod(SpdyHeaderBlock block) {
block.removeHeader(HttpNames.METHOD);
}
/**
* Returns the {@link HttpMethod} represented by the {@code "method"} header.
*/
public static HttpMethod getMethod(SpdyHeaderBlock block) {
try {
return HttpMethod.valueOf(block.getHeader(HttpNames.METHOD));
} catch (Exception e) {
return null;
}
}
/**
* Sets the {@code "method"} header.
*/
public static void setMethod(SpdyHeaderBlock block, HttpMethod method) {
block.setHeader(HttpNames.METHOD, method.getName());
}
/**
* Removes the {@code "scheme"} header.
*/
public static void removeScheme(SpdyHeaderBlock block) {
block.removeHeader(HttpNames.SCHEME);
}
/**
* Returns the value of the {@code "scheme"} header.
*/
public static String getScheme(SpdyHeaderBlock block) {
return block.getHeader(HttpNames.SCHEME);
}
/**
* Sets the {@code "scheme"} header.
*/
public static void setScheme(SpdyHeaderBlock block, String value) {
block.setHeader(HttpNames.SCHEME, value);
}
/**
* Removes the {@code "status"} header.
*/
public static void removeStatus(SpdyHeaderBlock block) {
block.removeHeader(HttpNames.STATUS);
}
/**
* Returns the {@link HttpResponseStatus} represented by the {@code "status"} header.
*/
public static HttpResponseStatus getStatus(SpdyHeaderBlock block) {
try {
String status = block.getHeader(HttpNames.STATUS);
int space = status.indexOf(' ');
if (space == -1) {
return HttpResponseStatus.valueOf(Integer.parseInt(status));
} else {
int code = Integer.parseInt(status.substring(0, space));
String reasonPhrase = status.substring(space + 1);
HttpResponseStatus responseStatus = HttpResponseStatus.valueOf(code);
if (responseStatus.getReasonPhrase().equals(responseStatus)) {
return responseStatus;
} else {
return new HttpResponseStatus(code, reasonPhrase);
}
}
} catch (Exception e) {
return null;
}
}
/**
* Sets the {@code "status"} header.
*/
public static void setStatus(SpdyHeaderBlock block, HttpResponseStatus status) {
block.setHeader(HttpNames.STATUS, status.toString());
}
/**
* Removes the {@code "url"} header.
*/
public static void removeUrl(SpdyHeaderBlock block) {
block.removeHeader(HttpNames.URL);
}
/**
* Returns the value of the {@code "url"} header.
*/
public static String getUrl(SpdyHeaderBlock block) {
return block.getHeader(HttpNames.URL);
}
/**
* Sets the {@code "url"} header.
*/
public static void setUrl(SpdyHeaderBlock block, String value) {
block.setHeader(HttpNames.URL, value);
}
/**
* Removes the {@code "version"} header.
*/
public static void removeVersion(SpdyHeaderBlock block) {
block.removeHeader(HttpNames.VERSION);
}
/**
* Returns the {@link HttpVersion} represented by the {@code "version"} header.
*/
public static HttpVersion getVersion(SpdyHeaderBlock block) {
try {
return HttpVersion.valueOf(block.getHeader(HttpNames.VERSION));
} catch (Exception e) {
return null;
}
}
/**
* Sets the {@code "version"} header.
*/
public static void setVersion(SpdyHeaderBlock block, HttpVersion version) {
block.setHeader(HttpNames.VERSION, version.getText());
}
private static final int BUCKET_SIZE = 17;
private static int hash(String name) {
int h = 0;
for (int i = name.length() - 1; i >= 0; i --) {
char c = name.charAt(i);
if (c >= 'A' && c <= 'Z') {
c += 32;
}
h = 31 * h + c;
}
if (h > 0) {
return h;
} else if (h == Integer.MIN_VALUE) {
return Integer.MAX_VALUE;
} else {
return -h;
}
}
private static boolean eq(String name1, String name2) {
int nameLen = name1.length();
if (nameLen != name2.length()) {
return false;
}
for (int i = nameLen - 1; i >= 0; i --) {
char c1 = name1.charAt(i);
char c2 = name2.charAt(i);
if (c1 != c2) {
if (c1 >= 'A' && c1 <= 'Z') {
c1 += 32;
}
if (c2 >= 'A' && c2 <= 'Z') {
c2 += 32;
}
if (c1 != c2) {
return false;
}
}
}
return true;
}
private static int index(int hash) {
return hash % BUCKET_SIZE;
}
private final Entry[] entries = new Entry[BUCKET_SIZE];
private final Entry head = new Entry(-1, null, null);
SpdyHeaders() {
head.before = head.after = head;
}
void addHeader(final String name, final Object value) {
String lowerCaseName = name.toLowerCase();
SpdyCodecUtil.validateHeaderName(lowerCaseName);
String strVal = toString(value);
SpdyCodecUtil.validateHeaderValue(strVal);
int h = hash(lowerCaseName);
int i = index(h);
addHeader0(h, i, lowerCaseName, strVal);
}
private void addHeader0(int h, int i, final String name, final String value) {
// Update the hash table.
Entry e = entries[i];
Entry newEntry;
entries[i] = newEntry = new Entry(h, name, value);
newEntry.next = e;
// Update the linked list.
newEntry.addBefore(head);
}
void removeHeader(final String name) {
if (name == null) {
throw new NullPointerException("name");
}
String lowerCaseName = name.toLowerCase();
int h = hash(lowerCaseName);
int i = index(h);
removeHeader0(h, i, lowerCaseName);
}
private void removeHeader0(int h, int i, String name) {
Entry e = entries[i];
if (e == null) {
return;
}
for (;;) {
if (e.hash == h && eq(name, e.key)) {
e.remove();
Entry next = e.next;
if (next != null) {
entries[i] = next;
e = next;
} else {
entries[i] = null;
return;
}
} else {
break;
}
}
for (;;) {
Entry next = e.next;
if (next == null) {
break;
}
if (next.hash == h && eq(name, next.key)) {
e.next = next.next;
next.remove();
} else {
e = next;
}
}
}
void setHeader(final String name, final Object value) {
String lowerCaseName = name.toLowerCase();
SpdyCodecUtil.validateHeaderName(lowerCaseName);
String strVal = toString(value);
SpdyCodecUtil.validateHeaderValue(strVal);
int h = hash(lowerCaseName);
int i = index(h);
removeHeader0(h, i, lowerCaseName);
addHeader0(h, i, lowerCaseName, strVal);
}
void setHeader(final String name, final Iterable<?> values) {
if (values == null) {
throw new NullPointerException("values");
}
String lowerCaseName = name.toLowerCase();
SpdyCodecUtil.validateHeaderName(lowerCaseName);
int h = hash(lowerCaseName);
int i = index(h);
removeHeader0(h, i, lowerCaseName);
for (Object v: values) {
if (v == null) {
break;
}
String strVal = toString(v);
SpdyCodecUtil.validateHeaderValue(strVal);
addHeader0(h, i, lowerCaseName, strVal);
}
}
void clearHeaders() {
for (int i = 0; i < entries.length; i ++) {
entries[i] = null;
}
head.before = head.after = head;
}
String getHeader(final String name) {
if (name == null) {
throw new NullPointerException("name");
}
int h = hash(name);
int i = index(h);
Entry e = entries[i];
while (e != null) {
if (e.hash == h && eq(name, e.key)) {
return e.value;
}
e = e.next;
}
return null;
}
List<String> getHeaders(final String name) {
if (name == null) {
throw new NullPointerException("name");
}
LinkedList<String> values = new LinkedList<String>();
int h = hash(name);
int i = index(h);
Entry e = entries[i];
while (e != null) {
if (e.hash == h && eq(name, e.key)) {
values.addFirst(e.value);
}
e = e.next;
}
return values;
}
List<Map.Entry<String, String>> getHeaders() {
List<Map.Entry<String, String>> all =
new LinkedList<Map.Entry<String, String>>();
Entry e = head.after;
while (e != head) {
all.add(e);
e = e.after;
}
return all;
}
boolean containsHeader(String name) {
return getHeader(name) != null;
}
Set<String> getHeaderNames() {
Set<String> names = new TreeSet<String>();
Entry e = head.after;
while (e != head) {
names.add(e.key);
e = e.after;
}
return names;
}
private static String toString(Object value) {
if (value == null) {
return null;
}
return value.toString();
}
private static final class Entry implements Map.Entry<String, String> {
final int hash;
final String key;
String value;
Entry next;
Entry before, after;
Entry(int hash, String key, String value) {
this.hash = hash;
this.key = key;
this.value = value;
}
void remove() {
before.after = after;
after.before = before;
}
void addBefore(Entry e) {
after = e;
before = e.before;
before.after = this;
after.before = this;
}
public String getKey() {
return key;
}
public String getValue() {
return value;
}
public String setValue(String value) {
if (value == null) {
throw new NullPointerException("value");
}
SpdyCodecUtil.validateHeaderValue(value);
String oldValue = this.value;
this.value = value;
return oldValue;
}
@Override
public String toString() {
return key + "=" + value;
}
}
}