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/*
* 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 io.netty.handler.codec.http;
import io.netty.buffer.ByteBuf;
import java.util.Arrays;
import java.util.Calendar;
import java.util.Date;
import java.util.Iterator;
import java.util.LinkedHashSet;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.NoSuchElementException;
import java.util.Set;
import static io.netty.util.internal.ObjectUtil.checkNotNull;
public class DefaultHttpHeaders extends HttpHeaders {
private static final int BUCKET_SIZE = 17;
private static int index(int hash) {
return hash % BUCKET_SIZE;
}
private final HeaderEntry[] entries = new HeaderEntry[BUCKET_SIZE];
private final HeaderEntry head = new HeaderEntry();
protected final boolean validate;
public DefaultHttpHeaders() {
this(true);
}
public DefaultHttpHeaders(boolean validate) {
this.validate = validate;
head.before = head.after = head;
}
void validateHeaderName0(CharSequence headerName) {
validateHeaderName(headerName);
}
@Override
public HttpHeaders add(HttpHeaders headers) {
if (headers instanceof DefaultHttpHeaders) {
if (headers == this) {
throw new IllegalArgumentException("can't add to itself.");
}
DefaultHttpHeaders defaultHttpHeaders = (DefaultHttpHeaders) headers;
HeaderEntry e = defaultHttpHeaders.head.after;
while (e != defaultHttpHeaders.head) {
add(e.key, e.value);
e = e.after;
}
return this;
} else {
return super.add(headers);
}
}
@Override
public HttpHeaders set(HttpHeaders headers) {
if (headers instanceof DefaultHttpHeaders) {
if (headers != this) {
clear();
DefaultHttpHeaders defaultHttpHeaders = (DefaultHttpHeaders) headers;
HeaderEntry e = defaultHttpHeaders.head.after;
while (e != defaultHttpHeaders.head) {
add(e.key, e.value);
e = e.after;
}
}
return this;
} else {
return super.set(headers);
}
}
@Override
public HttpHeaders add(final String name, final Object value) {
return add((CharSequence) name, value);
}
@Override
public HttpHeaders add(final CharSequence name, final Object value) {
CharSequence strVal;
if (validate) {
validateHeaderName0(name);
strVal = toCharSequence(value);
validateHeaderValue(strVal);
} else {
strVal = toCharSequence(value);
}
int h = hash(name);
int i = index(h);
add0(h, i, name, strVal);
return this;
}
@Override
public HttpHeaders add(String name, Iterable values) {
return add((CharSequence) name, values);
}
@Override
public HttpHeaders add(CharSequence name, Iterable values) {
if (validate) {
validateHeaderName0(name);
}
int h = hash(name);
int i = index(h);
for (Object v: values) {
CharSequence vstr = toCharSequence(v);
if (validate) {
validateHeaderValue(vstr);
}
add0(h, i, name, vstr);
}
return this;
}
private void add0(int h, int i, final CharSequence name, final CharSequence value) {
// Update the hash table.
HeaderEntry e = entries[i];
HeaderEntry newEntry;
entries[i] = newEntry = new HeaderEntry(h, name, value);
newEntry.next = e;
// Update the linked list.
newEntry.addBefore(head);
}
@Override
public HttpHeaders remove(final String name) {
return remove((CharSequence) name);
}
@Override
public HttpHeaders remove(final CharSequence name) {
if (name == null) {
throw new NullPointerException("name");
}
int h = hash(name);
int i = index(h);
remove0(h, i, name);
return this;
}
private void remove0(int h, int i, CharSequence name) {
HeaderEntry e = entries[i];
if (e == null) {
return;
}
for (;;) {
if (e.hash == h && equalsIgnoreCase(name, e.key)) {
e.remove();
HeaderEntry next = e.next;
if (next != null) {
entries[i] = next;
e = next;
} else {
entries[i] = null;
return;
}
} else {
break;
}
}
for (;;) {
HeaderEntry next = e.next;
if (next == null) {
break;
}
if (next.hash == h && equalsIgnoreCase(name, next.key)) {
e.next = next.next;
next.remove();
} else {
e = next;
}
}
}
@Override
public HttpHeaders set(final String name, final Object value) {
return set((CharSequence) name, value);
}
@Override
public HttpHeaders set(final CharSequence name, final Object value) {
CharSequence strVal;
if (validate) {
validateHeaderName0(name);
strVal = toCharSequence(value);
validateHeaderValue(strVal);
} else {
strVal = toCharSequence(value);
}
int h = hash(name);
int i = index(h);
remove0(h, i, name);
add0(h, i, name, strVal);
return this;
}
@Override
public HttpHeaders set(final String name, final Iterable values) {
return set((CharSequence) name, values);
}
@Override
public HttpHeaders set(final CharSequence name, final Iterable values) {
if (values == null) {
throw new NullPointerException("values");
}
if (validate) {
validateHeaderName0(name);
}
int h = hash(name);
int i = index(h);
remove0(h, i, name);
for (Object v: values) {
if (v == null) {
break;
}
CharSequence strVal = toCharSequence(v);
if (validate) {
validateHeaderValue(strVal);
}
add0(h, i, name, strVal);
}
return this;
}
@Override
public HttpHeaders clear() {
Arrays.fill(entries, null);
head.before = head.after = head;
return this;
}
@Override
public String get(final String name) {
return get((CharSequence) name);
}
@Override
public String get(final CharSequence name) {
if (name == null) {
throw new NullPointerException("name");
}
int h = hash(name);
int i = index(h);
HeaderEntry e = entries[i];
CharSequence value = null;
// loop until the first header was found
while (e != null) {
if (e.hash == h && equalsIgnoreCase(name, e.key)) {
value = e.value;
}
e = e.next;
}
if (value == null) {
return null;
}
return value.toString();
}
@Override
public List getAll(final String name) {
return getAll((CharSequence) name);
}
@Override
public List getAll(final CharSequence name) {
if (name == null) {
throw new NullPointerException("name");
}
LinkedList values = new LinkedList();
int h = hash(name);
int i = index(h);
HeaderEntry e = entries[i];
while (e != null) {
if (e.hash == h && equalsIgnoreCase(name, e.key)) {
values.addFirst(e.getValue());
}
e = e.next;
}
return values;
}
@Override
public List> entries() {
List> all =
new LinkedList>();
HeaderEntry e = head.after;
while (e != head) {
all.add(e);
e = e.after;
}
return all;
}
@Override
public Iterator> iterator() {
return new HeaderIterator();
}
@Override
public boolean contains(String name) {
return get(name) != null;
}
@Override
public boolean contains(CharSequence name) {
return get(name) != null;
}
@Override
public boolean isEmpty() {
return head == head.after;
}
@Override
public boolean contains(String name, String value, boolean ignoreCaseValue) {
return contains((CharSequence) name, (CharSequence) value, ignoreCaseValue);
}
@Override
public boolean contains(CharSequence name, CharSequence value, boolean ignoreCaseValue) {
if (name == null) {
throw new NullPointerException("name");
}
int h = hash(name);
int i = index(h);
HeaderEntry e = entries[i];
while (e != null) {
if (e.hash == h && equalsIgnoreCase(name, e.key)) {
if (ignoreCaseValue) {
if (equalsIgnoreCase(e.value, value)) {
return true;
}
} else {
if (e.value.equals(value)) {
return true;
}
}
}
e = e.next;
}
return false;
}
@Override
public Set names() {
Set names = new LinkedHashSet();
HeaderEntry e = head.after;
while (e != head) {
names.add(e.getKey());
e = e.after;
}
return names;
}
private static CharSequence toCharSequence(Object value) {
checkNotNull(value, "value");
if (value instanceof CharSequence) {
return (CharSequence) value;
}
if (value instanceof Number) {
return value.toString();
}
if (value instanceof Date) {
return HttpHeaderDateFormat.get().format((Date) value);
}
if (value instanceof Calendar) {
return HttpHeaderDateFormat.get().format(((Calendar) value).getTime());
}
return value.toString();
}
void encode(ByteBuf buf) {
HeaderEntry e = head.after;
while (e != head) {
e.encode(buf);
e = e.after;
}
}
private final class HeaderIterator implements Iterator> {
private HeaderEntry current = head;
@Override
public boolean hasNext() {
return current.after != head;
}
@Override
public Entry next() {
current = current.after;
if (current == head) {
throw new NoSuchElementException();
}
return current;
}
@Override
public void remove() {
throw new UnsupportedOperationException();
}
}
private final class HeaderEntry implements Map.Entry {
final int hash;
final CharSequence key;
CharSequence value;
HeaderEntry next;
HeaderEntry before, after;
HeaderEntry(int hash, CharSequence key, CharSequence value) {
this.hash = hash;
this.key = key;
this.value = value;
}
HeaderEntry() {
hash = -1;
key = null;
value = null;
}
void remove() {
before.after = after;
after.before = before;
}
void addBefore(HeaderEntry e) {
after = e;
before = e.before;
before.after = this;
after.before = this;
}
@Override
public String getKey() {
return key.toString();
}
@Override
public String getValue() {
return value.toString();
}
@Override
public String setValue(String value) {
if (value == null) {
throw new NullPointerException("value");
}
validateHeaderValue(value);
CharSequence oldValue = this.value;
this.value = value;
return oldValue.toString();
}
@Override
public String toString() {
return key.toString() + '=' + value.toString();
}
void encode(ByteBuf buf) {
HttpHeaders.encode(key, value, buf);
}
}
}
