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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 org.jivesoftware.smack.packet.Message;
+import org.jivesoftware.smack.packet.PacketExtension;
+import org.jivesoftware.smackx.pubsub.provider.ItemProvider;
+
+/**
+ * This class represents an item that has been, or will be published to a
+ * pubsub node. An <tt>Item</tt> has several properties that are dependent
+ * on the configuration of the node to which it has been or will be published.
+ *
+ * <h1>An Item received from a node (via {@link LeafNode#getItems()} or {@link LeafNode#addItemEventListener(org.jivesoftware.smackx.pubsub.listener.ItemEventListener)}</b>
+ * <li>Will always have an id (either user or server generated) unless node configuration has both
+ * {@link ConfigureForm#isPersistItems()} and {@link ConfigureForm#isDeliverPayloads()}set to false.
+ * <li>Will have a payload if the node configuration has {@link ConfigureForm#isDeliverPayloads()} set
+ * to true, otherwise it will be null.
+ *
+ * <h1>An Item created to send to a node (via {@link LeafNode#send()} or {@link LeafNode#publish()}</b>
+ * <li>The id is optional, since the server will generate one if necessary, but should be used if it is
+ * meaningful in the context of the node. This value must be unique within the node that it is sent to, since
+ * resending an item with the same id will overwrite the one that already exists if the items are persisted.
+ * <li>Will require payload if the node configuration has {@link ConfigureForm#isDeliverPayloads()} set
+ * to true.
+ *
+ * <p>To customise the payload object being returned from the {@link #getPayload()} method, you can
+ * add a custom parser as explained in {@link ItemProvider}.
+ *
+ * @author Robin Collier
+ */
+public class PayloadItem<E extends PacketExtension> extends Item
+{
+ private E payload;
+
+ /**
+ * Create an <tt>Item</tt> with no id and a payload The id will be set by the server.
+ *
+ * @param payloadExt A {@link PacketExtension} which represents the payload data.
+ */
+ public PayloadItem(E payloadExt)
+ {
+ super();
+
+ if (payloadExt == null)
+ throw new IllegalArgumentException("payload cannot be 'null'");
+ payload = payloadExt;
+ }
+
+ /**
+ * Create an <tt>Item</tt> with an id and payload.
+ *
+ * @param itemId The id of this item. It can be null if we want the server to set the id.
+ * @param payloadExt A {@link PacketExtension} which represents the payload data.
+ */
+ public PayloadItem(String itemId, E payloadExt)
+ {
+ super(itemId);
+
+ if (payloadExt == null)
+ throw new IllegalArgumentException("payload cannot be 'null'");
+ payload = payloadExt;
+ }
+
+ /**
+ * Create an <tt>Item</tt> with an id, node id and payload.
+ *
+ * <p>
+ * <b>Note:</b> This is not valid for publishing an item to a node, only receiving from
+ * one as part of {@link Message}. If used to create an Item to publish
+ * (via {@link LeafNode#publish(Item)}, the server <i>may</i> return an
+ * error for an invalid packet.
+ *
+ * @param itemId The id of this item.
+ * @param nodeId The id of the node the item was published to.
+ * @param payloadExt A {@link PacketExtension} which represents the payload data.
+ */
+ public PayloadItem(String itemId, String nodeId, E payloadExt)
+ {
+ super(itemId, nodeId);
+
+ if (payloadExt == null)
+ throw new IllegalArgumentException("payload cannot be 'null'");
+ payload = payloadExt;
+ }
+
+ /**
+ * Get the payload associated with this <tt>Item</tt>. Customising the payload
+ * parsing from the server can be accomplished as described in {@link ItemProvider}.
+ *
+ * @return The payload as a {@link PacketExtension}.
+ */
+ public E getPayload()
+ {
+ return payload;
+ }
+
+ @Override
+ public String toXML()
+ {
+ StringBuilder builder = new StringBuilder("<item");
+
+ if (getId() != null)
+ {
+ builder.append(" id='");
+ builder.append(getId());
+ builder.append("'");
+ }
+
+ if (getNode() != null) {
+ builder.append(" node='");
+ builder.append(getNode());
+ builder.append("'");
+ }
+ builder.append(">");
+ builder.append(payload.toXML());
+ builder.append("</item>");
+
+ return builder.toString();
+ }
+
+ @Override
+ public String toString()
+ {
+ return getClass().getName() + " | Content [" + toXML() + "]";
+ }
+}