org.jivesoftware.smackx.iqprivate.PrivateDataManager Maven / Gradle / Ivy
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/**
*
* Copyright 2003-2007 Jive Software.
*
* 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.iqprivate;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import java.util.WeakHashMap;
import javax.xml.namespace.QName;
import org.jivesoftware.smack.Manager;
import org.jivesoftware.smack.SmackConfiguration;
import org.jivesoftware.smack.SmackException.NoResponseException;
import org.jivesoftware.smack.SmackException.NotConnectedException;
import org.jivesoftware.smack.XMPPConnection;
import org.jivesoftware.smack.XMPPException.XMPPErrorException;
import org.jivesoftware.smack.packet.IQ;
import org.jivesoftware.smack.packet.StanzaError.Condition;
import org.jivesoftware.smack.packet.XmlEnvironment;
import org.jivesoftware.smack.provider.IQProvider;
import org.jivesoftware.smack.xml.XmlPullParser;
import org.jivesoftware.smack.xml.XmlPullParserException;
import org.jivesoftware.smackx.iqprivate.packet.DefaultPrivateData;
import org.jivesoftware.smackx.iqprivate.packet.PrivateData;
import org.jivesoftware.smackx.iqprivate.packet.PrivateDataIQ;
import org.jivesoftware.smackx.iqprivate.provider.PrivateDataProvider;
/**
* Manages private data, which is a mechanism to allow users to store arbitrary XML
* data on an XMPP server. Each private data chunk is defined by a element name and
* XML namespace. Example private data:
*
*
* <color xmlns="http://example.com/xmpp/color">
* <favorite>blue</blue>
* <leastFavorite>puce</leastFavorite>
* </color>
*
*
* {@link PrivateDataProvider} instances are responsible for translating the XML into objects.
* If no PrivateDataProvider is registered for a given element name and namespace, then
* a {@link DefaultPrivateData} instance will be returned.
*
* Warning: this is an non-standard protocol documented by
* XEP-49. Because this is a
* non-standard protocol, it is subject to change.
*
* @author Matt Tucker
*/
public final class PrivateDataManager extends Manager {
private static final Map instances = new WeakHashMap();
public static synchronized PrivateDataManager getInstanceFor(XMPPConnection connection) {
PrivateDataManager privateDataManager = instances.get(connection);
if (privateDataManager == null) {
privateDataManager = new PrivateDataManager(connection);
}
return privateDataManager;
}
/**
* Map of provider instances.
*/
private static final Map privateDataProviders = new HashMap<>();
/**
* Returns the private data provider registered to the specified XML element name and namespace.
* For example, if a provider was registered to the element name "prefs" and the
* namespace "http://www.xmppclient.com/prefs", then the following stanza would trigger
* the provider:
*
*
* <iq type='result' to='[email protected]' from='[email protected]' id='time_1'>
* <query xmlns='jabber:iq:private'>
* <prefs xmlns='http://www.xmppclient.com/prefs'>
* <value1>ABC</value1>
* <value2>XYZ</value2>
* </prefs>
* </query>
* </iq>
*
* Note: this method is generally only called by the internal Smack classes.
*
* @param elementName the XML element name.
* @param namespace the XML namespace.
* @return the PrivateData provider.
*/
public static PrivateDataProvider getPrivateDataProvider(String elementName, String namespace) {
QName key = new QName(namespace, elementName);
return privateDataProviders.get(key);
}
/**
* Adds a private data provider with the specified element name and name space. The provider
* will override any providers loaded through the classpath.
*
* @param elementName the XML element name.
* @param namespace the XML namespace.
* @param provider the private data provider.
*/
public static void addPrivateDataProvider(String elementName, String namespace,
PrivateDataProvider provider) {
QName key = new QName(namespace, elementName);
privateDataProviders.put(key, provider);
}
/**
* Removes a private data provider with the specified element name and namespace.
*
* @param elementName The XML element name.
* @param namespace The XML namespace.
*/
public static void removePrivateDataProvider(String elementName, String namespace) {
QName key = new QName(namespace, elementName);
privateDataProviders.remove(key);
}
/**
* Creates a new private data manager.
*
* @param connection an XMPP connection which must have already undergone a
* successful login.
*/
private PrivateDataManager(XMPPConnection connection) {
super(connection);
instances.put(connection, this);
}
/**
* Returns the private data specified by the given element name and namespace. Each chunk
* of private data is uniquely identified by an element name and namespace pair.
*
* If a PrivateDataProvider is registered for the specified element name/namespace pair then
* that provider will determine the specific object type that is returned. If no provider
* is registered, a {@link DefaultPrivateData} instance will be returned.
*
* @param elementName the element name.
* @param namespace the namespace.
* @return the private data.
* @throws XMPPErrorException
* @throws NoResponseException
* @throws NotConnectedException
* @throws InterruptedException
*/
public PrivateData getPrivateData(final String elementName, final String namespace) throws NoResponseException, XMPPErrorException, NotConnectedException, InterruptedException {
// Create an IQ packet to get the private data.
IQ privateDataGet = new PrivateDataIQ(elementName, namespace);
PrivateDataIQ response = connection().createStanzaCollectorAndSend(
privateDataGet).nextResultOrThrow();
return response.getPrivateData();
}
/**
* Sets a private data value. Each chunk of private data is uniquely identified by an
* element name and namespace pair. If private data has already been set with the
* element name and namespace, then the new private data will overwrite the old value.
*
* @param privateData the private data.
* @throws XMPPErrorException
* @throws NoResponseException
* @throws NotConnectedException
* @throws InterruptedException
*/
public void setPrivateData(final PrivateData privateData) throws NoResponseException, XMPPErrorException, NotConnectedException, InterruptedException {
// Create an IQ packet to set the private data.
IQ privateDataSet = new PrivateDataIQ(privateData);
connection().createStanzaCollectorAndSend(privateDataSet).nextResultOrThrow();
}
private static final PrivateData DUMMY_PRIVATE_DATA = new PrivateData() {
@Override
public String getElementName() {
return "smackDummyPrivateData";
}
@Override
public String getNamespace() {
return SmackConfiguration.SMACK_URL_STRING;
}
@Override
public CharSequence toXML() {
return '<' + getElementName() + " xmlns='" + getNamespace() + "'/>";
}
};
/**
* Check if the service supports private data.
*
* @return true if the service supports private data, false otherwise.
* @throws NoResponseException
* @throws NotConnectedException
* @throws InterruptedException
* @throws XMPPErrorException
* @since 4.2
*/
public boolean isSupported() throws NoResponseException, NotConnectedException,
InterruptedException, XMPPErrorException {
// This is just a primitive hack, since XEP-49 does not specify a way to determine if the
// service supports it
try {
setPrivateData(DUMMY_PRIVATE_DATA);
return true;
}
catch (XMPPErrorException e) {
if (e.getStanzaError().getCondition() == Condition.service_unavailable) {
return false;
}
else {
throw e;
}
}
}
/**
* An IQ provider to parse IQ results containing private data.
*/
public static class PrivateDataIQProvider extends IQProvider {
@Override
public PrivateDataIQ parse(XmlPullParser parser, int initialDepth, XmlEnvironment xmlEnvironment)
throws XmlPullParserException, IOException {
PrivateData privateData = null;
boolean done = false;
while (!done) {
XmlPullParser.Event eventType = parser.next();
if (eventType == XmlPullParser.Event.START_ELEMENT) {
String elementName = parser.getName();
String namespace = parser.getNamespace();
// See if any objects are registered to handle this private data type.
PrivateDataProvider provider = getPrivateDataProvider(elementName, namespace);
// If there is a registered provider, use it.
if (provider != null) {
privateData = provider.parsePrivateData(parser);
}
// Otherwise, use a DefaultPrivateData instance to store the private data.
else {
DefaultPrivateData data = new DefaultPrivateData(elementName, namespace);
boolean finished = false;
while (!finished) {
XmlPullParser.Event event = parser.next();
if (event == XmlPullParser.Event.START_ELEMENT) {
String name = parser.getName();
event = parser.next();
if (event == XmlPullParser.Event.TEXT_CHARACTERS) {
String value = parser.getText();
data.setValue(name, value);
}
else if (event == XmlPullParser.Event.END_ELEMENT) {
// If an empty element, set the value with the empty string.
data.setValue(name, "");
}
}
else if (event == XmlPullParser.Event.END_ELEMENT) {
if (parser.getName().equals(elementName)) {
finished = true;
}
}
}
privateData = data;
}
}
else if (eventType == XmlPullParser.Event.END_ELEMENT) {
if (parser.getName().equals("query")) {
done = true;
}
}
}
return new PrivateDataIQ(privateData);
}
}
}