/*
* #%L
* JBossOSGi Resolver API
* %%
* Copyright (C) 2010 - 2012 JBoss by Red Hat
* %%
* 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.
* #L%
*/
package org.jboss.osgi.resolver.spi;
import org.jboss.osgi.resolver.XElement;
import org.jboss.osgi.spi.AttachableSupport;
import org.jboss.osgi.spi.AttachmentKey;
import org.jboss.osgi.spi.Attachable;
/**
* The abstract implementation of a {@link XElement}.
*
* @author thomas.diesler@jboss.com
* @since 02-Jul-2010
*/
public abstract class AbstractElement implements XElement {
private Attachable attachments;
@Override
public <T> T putAttachment(AttachmentKey<T> key, T value) {
if (attachments == null)
attachments = new AttachableSupport();
return attachments.putAttachment(key, value);
}
@Override
public <T> T getAttachment(AttachmentKey<T> key) {
if (attachments == null)
return null;
return attachments.getAttachment(key);
}
@Override
public <T> T removeAttachment(AttachmentKey<T> key) {
if (attachments == null)
return null;
return attachments.removeAttachment(key);
}
}