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This artifact provides a single jar that contains all classes required to use remote EJB and JMS, including all dependencies. It is intended for use by those not using maven, maven users should just import the EJB and JMS BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up with different versions on classes on the class path).

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/*
 * 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);
            }
        }
    }

}