io.undertow.util.AbstractAttachable Maven / Gradle / Ivy
/*
* 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 David M. Lloyd
*/
public abstract class AbstractAttachable implements Attachable {
private Map, Object> attachments;
/**
* {@inheritDoc}
*/
@Override
public T getAttachment(final AttachmentKey key) {
if (key == null || attachments == null) {
return null;
}
return (T) attachments.get(key);
}
/**
* {@inheritDoc}
*/
@Override
public List getAttachmentList(AttachmentKey> key) {
if (key == null || attachments == null) {
return Collections.emptyList();
}
List list = (List) attachments.get(key);
if (list == null) {
return Collections.emptyList();
}
return list;
}
/**
* {@inheritDoc}
*/
@Override
public T putAttachment(final AttachmentKey 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, Object> createAttachmentMap() {
return new IdentityHashMap<>(5);
}
/**
* {@inheritDoc}
*/
@Override
public T removeAttachment(final AttachmentKey key) {
if (key == null || attachments == null) {
return null;
}
return (T) attachments.remove(key);
}
/**
* {@inheritDoc}
*/
@Override
public void addToAttachmentList(final AttachmentKey> key, final T value) {
if (key != null) {
if(attachments == null) {
attachments = createAttachmentMap();
}
final Map, Object> attachments = this.attachments;
final AttachmentList list = (AttachmentList) attachments.get(key);
if (list == null) {
final AttachmentList newList = new AttachmentList<>(((ListAttachmentKey) key).getValueClass());
attachments.put(key, newList);
newList.add(value);
} else {
list.add(value);
}
}
}
}