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/**
* All rights reserved. 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 org.jivesoftware.smackx.pubsub;
import java.util.List;
import org.jivesoftware.smack.packet.PacketExtension;
/**
* This class is used to for multiple purposes.
* <li>It can represent an event containing a list of items that have been published
* <li>It can represent an event containing a list of retracted (deleted) items.
* <li>It can represent a request to delete a list of items.
* <li>It can represent a request to get existing items.
*
* <p><b>Please note, this class is used for internal purposes, and is not required for usage of
* pubsub functionality.</b>
*
* @author Robin Collier
*/
public class ItemsExtension extends NodeExtension implements EmbeddedPacketExtension
{
protected ItemsElementType type;
protected Boolean notify;
protected List<? extends PacketExtension> items;
public enum ItemsElementType
{
/** An items element, which has an optional <b>max_items</b> attribute when requesting items */
items(PubSubElementType.ITEMS, "max_items"),
/** A retract element, which has an optional <b>notify</b> attribute when publishing deletions */
retract(PubSubElementType.RETRACT, "notify");
private PubSubElementType elem;
private String att;
private ItemsElementType(PubSubElementType nodeElement, String attribute)
{
elem = nodeElement;
att = attribute;
}
public PubSubElementType getNodeElement()
{
return elem;
}
public String getElementAttribute()
{
return att;
}
}
/**
* Construct an instance with a list representing items that have been published or deleted.
*
* <p>Valid scenarios are:
* <li>Request items from node - itemsType = {@link ItemsElementType#items}, items = list of {@link Item} and an
* optional value for the <b>max_items</b> attribute.
* <li>Request to delete items - itemsType = {@link ItemsElementType#retract}, items = list of {@link Item} containing
* only id's and an optional value for the <b>notify</b> attribute.
* <li>Items published event - itemsType = {@link ItemsElementType#items}, items = list of {@link Item} and
* attributeValue = <code>null</code>
* <li>Items deleted event - itemsType = {@link ItemsElementType#items}, items = list of {@link RetractItem} and
* attributeValue = <code>null</code>
*
* @param itemsType Type of representation
* @param nodeId The node to which the items are being sent or deleted
* @param items The list of {@link Item} or {@link RetractItem}
* @param attributeValue The value of the <b>max_items</b>
*/
public ItemsExtension(ItemsElementType itemsType, String nodeId, List<? extends PacketExtension> items)
{
super(itemsType.getNodeElement(), nodeId);
type = itemsType;
this.items = items;
}
/**
* Construct an instance with a list representing items that have been published or deleted.
*
* <p>Valid scenarios are:
* <li>Request items from node - itemsType = {@link ItemsElementType#items}, items = list of {@link Item} and an
* optional value for the <b>max_items</b> attribute.
* <li>Request to delete items - itemsType = {@link ItemsElementType#retract}, items = list of {@link Item} containing
* only id's and an optional value for the <b>notify</b> attribute.
* <li>Items published event - itemsType = {@link ItemsElementType#items}, items = list of {@link Item} and
* attributeValue = <code>null</code>
* <li>Items deleted event - itemsType = {@link ItemsElementType#items}, items = list of {@link RetractItem} and
* attributeValue = <code>null</code>
*
* @param itemsType Type of representation
* @param nodeId The node to which the items are being sent or deleted
* @param items The list of {@link Item} or {@link RetractItem}
* @param attributeValue The value of the <b>max_items</b>
*/
public ItemsExtension(String nodeId, List<? extends PacketExtension> items, boolean notify)
{
super(ItemsElementType.retract.getNodeElement(), nodeId);
type = ItemsElementType.retract;
this.items = items;
this.notify = notify;
}
/**
* Get the type of element
*
* @return The element type
*/
public ItemsElementType getItemsElementType()
{
return type;
}
public List<PacketExtension> getExtensions()
{
return (List<PacketExtension>)getItems();
}
/**
* Gets the items related to the type of request or event.
*
* return List of {@link Item}, {@link RetractItem}, or null
*/
public List<? extends PacketExtension> getItems()
{
return items;
}
/**
* Gets the value of the optional attribute related to the {@link ItemsElementType}.
*
* @return The attribute value
*/
public boolean getNotify()
{
return notify;
}
@Override
public String toXML()
{
if ((items == null) || (items.size() == 0))
{
return super.toXML();
}
else
{
StringBuilder builder = new StringBuilder("<");
builder.append(getElementName());
builder.append(" node='");
builder.append(getNode());
if (notify != null)
{
builder.append("' ");
builder.append(type.getElementAttribute());
builder.append("='");
builder.append(notify.equals(Boolean.TRUE) ? 1 : 0);
builder.append("'>");
}
else
{
builder.append("'>");
for (PacketExtension item : items)
{
builder.append(item.toXML());
}
}
builder.append("</");
builder.append(getElementName());
builder.append(">");
return builder.toString();
}
}
@Override
public String toString()
{
return getClass().getName() + "Content [" + toXML() + "]";
}
}
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