/*
* JBoss, Home of Professional Open Source.
* Copyright 2014 Red Hat, Inc., and individual contributors
* as indicated by the @author tags.
*
* 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 io.undertow.util;
import java.util.
Collections;
import java.util.
IdentityHashMap;
import java.util.
List;
import java.util.
Map;
import io.undertow.
UndertowMessages;
/**
* A thing which can have named attachments.
*
* @author <a href="mailto:david.lloyd@redhat.com">David M. Lloyd</a>
*/
public abstract class
AbstractAttachable implements
Attachable {
private
Map<
AttachmentKey<?>,
Object>
attachments;
/**
* {@inheritDoc}
*/
@
Override
public <T> T
getAttachment(final
AttachmentKey<T>
key) {
if (
key == null ||
attachments == null) {
return null;
}
return (T)
attachments.
get(
key);
}
/**
* {@inheritDoc}
*/
@
Override
public <T>
List<T>
getAttachmentList(
AttachmentKey<? extends
List<T>>
key) {
if (
key == null ||
attachments == null) {
return
Collections.
emptyList();
}
List<T>
list = (
List<T>)
attachments.
get(
key);
if (
list == null) {
return
Collections.
emptyList();
}
return
list;
}
/**
* {@inheritDoc}
*/
@
Override
public <T> T
putAttachment(final
AttachmentKey<T>
key, final T
value) {
if (
key == null) {
throw
UndertowMessages.
MESSAGES.
argumentCannotBeNull("key");
}
if(
attachments == null) {
attachments =
createAttachmentMap();
}
return (T)
attachments.
put(
key,
value);
}
protected
Map<
AttachmentKey<?>,
Object>
createAttachmentMap() {
return new
IdentityHashMap<>(5);
}
/**
* {@inheritDoc}
*/
@
Override
public <T> T
removeAttachment(final
AttachmentKey<T>
key) {
if (
key == null ||
attachments == null) {
return null;
}
return (T)
attachments.
remove(
key);
}
/**
* {@inheritDoc}
*/
@
Override
public <T> void
addToAttachmentList(final
AttachmentKey<
AttachmentList<T>>
key, final T
value) {
if (
key != null) {
if(
attachments == null) {
attachments =
createAttachmentMap();
}
final
Map<
AttachmentKey<?>,
Object>
attachments = this.
attachments;
final
AttachmentList<T>
list = (
AttachmentList<T>)
attachments.
get(
key);
if (
list == null) {
final
AttachmentList<T>
newList = new
AttachmentList<>(((
ListAttachmentKey<T>)
key).
getValueClass());
attachments.
put(
key,
newList);
newList.
add(
value);
} else {
list.
add(
value);
}
}
}
}