/*
* JBoss, Home of Professional Open Source.
* Copyright 2015, Red Hat, Inc., and individual contributors
* as indicated by the @author tags. See the copyright.txt file in the
* distribution for a full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jboss.as.controller.transform;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import org.jboss.as.controller.OperationContext;
import org.wildfly.common.Assert;
/**
* Internal class for providing attachments. Although it is in the .transform package, this is more to avoid polluting
* the parent package.
*
* @author <a href="mailto:kabir.khan@jboss.com">Kabir Khan</a>
*/
public class ContextAttachments {
/**
* A concurrent map for the attachments.
*/
private final ConcurrentMap<OperationContext.AttachmentKey<?>, Object> valueAttachments = new ConcurrentHashMap<>();
public ContextAttachments() {
}
public <V> V getAttachment(final OperationContext.AttachmentKey<V> key) {
Assert.checkNotNullParam("key", key);
return key.cast(valueAttachments.get(key));
}
public <V> V attach(final OperationContext.AttachmentKey<V> key, final V value) {
Assert.checkNotNullParam("key", key);
return key.cast(valueAttachments.put(key, value));
}
public <V> V attachIfAbsent(final OperationContext.AttachmentKey<V> key, final V value) {
Assert.checkNotNullParam("key", key);
return key.cast(valueAttachments.putIfAbsent(key, value));
}
public <V> V detach(final OperationContext.AttachmentKey<V> key) {
Assert.checkNotNullParam("key", key);
return key.cast(valueAttachments.remove(key));
}
}