/**
* $RCSfile$
* $Revision$
* $Date$
*
* Copyright 2003-2007 Jive Software.
*
* 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.packet;
import org.jivesoftware.smack.packet.IQ;
import org.jivesoftware.smack.util.StringUtils;
import java.util.Collection;
import java.util.Collections;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import java.util.concurrent.CopyOnWriteArrayList;
/**
* A DiscoverInfo IQ packet, which is used by XMPP clients to request and receive information
* to/from other XMPP entities.<p>
*
* The received information may contain one or more identities of the requested XMPP entity, and
* a list of supported features by the requested XMPP entity.
*
* @author Gaston Dombiak
*/
public class DiscoverInfo extends IQ {
public static final String NAMESPACE = "http://jabber.org/protocol/disco#info";
private final List<Feature> features = new CopyOnWriteArrayList<Feature>();
private final List<Identity> identities = new CopyOnWriteArrayList<Identity>();
private String node;
public DiscoverInfo() {
super();
}
/**
* Copy constructor
*
* @param d
*/
public DiscoverInfo(DiscoverInfo d) {
super(d);
// Set node
setNode(d.getNode());
// Copy features
synchronized (d.features) {
for (Feature f : d.features) {
addFeature(f);
}
}
// Copy identities
synchronized (d.identities) {
for (Identity i : d.identities) {
addIdentity(i);
}
}
}
/**
* Adds a new feature to the discovered information.
*
* @param feature the discovered feature
*/
public void addFeature(String feature) {
addFeature(new Feature(feature));
}
/**
* Adds a collection of features to the packet. Does noting if featuresToAdd is null.
*
* @param featuresToAdd
*/
public void addFeatures(Collection<String> featuresToAdd) {
if (featuresToAdd == null) return;
for (String feature : featuresToAdd) {
addFeature(feature);
}
}
private void addFeature(Feature feature) {
synchronized (features) {
features.add(feature);
}
}
/**
* Returns the discovered features of an XMPP entity.
*
* @return an Iterator on the discovered features of an XMPP entity
*/
public Iterator<Feature> getFeatures() {
synchronized (features) {
return Collections.unmodifiableList(features).iterator();
}
}
/**
* Adds a new identity of the requested entity to the discovered information.
*
* @param identity the discovered entity's identity
*/
public void addIdentity(Identity identity) {
synchronized (identities) {
identities.add(identity);
}
}
/**
* Adds identities to the DiscoverInfo stanza
*
* @param identitiesToAdd
*/
public void addIdentities(Collection<Identity> identitiesToAdd) {
if (identitiesToAdd == null) return;
synchronized (identities) {
identities.addAll(identitiesToAdd);
}
}
/**
* Returns the discovered identities of an XMPP entity.
*
* @return an Iterator on the discoveted identities
*/
public Iterator<Identity> getIdentities() {
synchronized (identities) {
return Collections.unmodifiableList(identities).iterator();
}
}
/**
* Returns the node attribute that supplements the 'jid' attribute. A node is merely
* something that is associated with a JID and for which the JID can provide information.<p>
*
* Node attributes SHOULD be used only when trying to provide or query information which
* is not directly addressable.
*
* @return the node attribute that supplements the 'jid' attribute
*/
public String getNode() {
return node;
}
/**
* Sets the node attribute that supplements the 'jid' attribute. A node is merely
* something that is associated with a JID and for which the JID can provide information.<p>
*
* Node attributes SHOULD be used only when trying to provide or query information which
* is not directly addressable.
*
* @param node the node attribute that supplements the 'jid' attribute
*/
public void setNode(String node) {
this.node = node;
}
/**
* Returns true if the specified feature is part of the discovered information.
*
* @param feature the feature to check
* @return true if the requestes feature has been discovered
*/
public boolean containsFeature(String feature) {
for (Iterator<Feature> it = getFeatures(); it.hasNext();) {
if (feature.equals(it.next().getVar()))
return true;
}
return false;
}
public String getChildElementXML() {
StringBuilder buf = new StringBuilder();
buf.append("<query xmlns=\"" + NAMESPACE + "\"");
if (getNode() != null) {
buf.append(" node=\"");
buf.append(StringUtils.escapeForXML(getNode()));
buf.append("\"");
}
buf.append(">");
synchronized (identities) {
for (Identity identity : identities) {
buf.append(identity.toXML());
}
}
synchronized (features) {
for (Feature feature : features) {
buf.append(feature.toXML());
}
}
// Add packet extensions, if any are defined.
buf.append(getExtensionsXML());
buf.append("</query>");
return buf.toString();
}
/**
* Test if a DiscoverInfo response contains duplicate identities.
*
* @return true if duplicate identities where found, otherwise false
*/
public boolean containsDuplicateIdentities() {
List<Identity> checkedIdentities = new LinkedList<Identity>();
for (Identity i : identities) {
for (Identity i2 : checkedIdentities) {
if (i.equals(i2))
return true;
}
checkedIdentities.add(i);
}
return false;
}
/**
* Test if a DiscoverInfo response contains duplicate features.
*
* @return true if duplicate identities where found, otherwise false
*/
public boolean containsDuplicateFeatures() {
List<Feature> checkedFeatures = new LinkedList<Feature>();
for (Feature f : features) {
for (Feature f2 : checkedFeatures) {
if (f.equals(f2))
return true;
}
checkedFeatures.add(f);
}
return false;
}
/**
* Represents the identity of a given XMPP entity. An entity may have many identities but all
* the identities SHOULD have the same name.<p>
*
* Refer to <a href="http://www.jabber.org/registrar/disco-categories.html">Jabber::Registrar</a>
* in order to get the official registry of values for the <i>category</i> and <i>type</i>
* attributes.
*
*/
public static class Identity implements Comparable<Object> {
private String category;
private String name;
private String type;
private String lang; // 'xml:lang;
/**
* Creates a new identity for an XMPP entity.
* 'category' and 'type' are required by
* <a href="http://xmpp.org/extensions/xep-0030.html#schemas">XEP-30 XML Schemas</a>
*
* @param category the entity's category (required as per XEP-30).
* @param name the entity's name.
* @param type the entity's type (required as per XEP-30).
*/
public Identity(String category, String name, String type) {
this.category = category;
this.name = name;
this.type = type;
}
/**
* Returns the entity's category. To get the official registry of values for the
* 'category' attribute refer to <a href="http://www.jabber.org/registrar/disco-categories.html">Jabber::Registrar</a>
*
* @return the entity's category.
*/
public String getCategory() {
return category;
}
/**
* Returns the identity's name.
*
* @return the identity's name.
*/
public String getName() {
return name;
}
/**
* Returns the entity's type. To get the official registry of values for the
* 'type' attribute refer to <a href="http://www.jabber.org/registrar/disco-categories.html">Jabber::Registrar</a>
*
* @return the entity's type.
*/
public String getType() {
return type;
}
/**
* Sets the entity's type. To get the official registry of values for the
* 'type' attribute refer to <a href="http://www.jabber.org/registrar/disco-categories.html">Jabber::Registrar</a>
*
* @param type the identity's type.
*/
public void setType(String type) {
this.type = type;
}
/**
* Sets the natural language (xml:lang) for this identity (optional)
*
* @param lang the xml:lang of this Identity
*/
public void setLanguage(String lang) {
this.lang = lang;
}
/**
* Returns the identities natural language if one is set
*
* @return the value of xml:lang of this Identity
*/
public String getLanguage() {
return lang;
}
public String toXML() {
StringBuilder buf = new StringBuilder();
buf.append("<identity");
// Check if this packet has 'lang' set and maybe append it to the resulting string
if (lang != null)
buf.append(" xml:lang=\"").append(StringUtils.escapeForXML(lang)).append("\"");
// Category must always be set
buf.append(" category=\"").append(StringUtils.escapeForXML(category)).append("\"");
// Name must always be set
buf.append(" name=\"").append(StringUtils.escapeForXML(name)).append("\"");
// Check if this packet has 'type' set and maybe append it to the resulting string
if (type != null) {
buf.append(" type=\"").append(StringUtils.escapeForXML(type)).append("\"");
}
buf.append("/>");
return buf.toString();
}
/**
* Check equality for Identity for category, type, lang and name
* in that order as defined by
* <a href="http://xmpp.org/extensions/xep-0115.html#ver-proc">XEP-0015 5.4 Processing Method (Step 3.3)</a>
*
*/
public boolean equals(Object obj) {
if (obj == null)
return false;
if (obj == this)
return true;
if (obj.getClass() != getClass())
return false;
DiscoverInfo.Identity other = (DiscoverInfo.Identity) obj;
if (!this.category.equals(other.category))
return false;
String otherLang = other.lang == null ? "" : other.lang;
String thisLang = lang == null ? "" : lang;
if (!other.type.equals(type))
return false;
if (!otherLang.equals(thisLang))
return false;
String otherName = other.name == null ? "" : other.name;
String thisName = name == null ? "" : other.name;
if (!thisName.equals(otherName))
return false;
return true;
}
/**
* Compares and identity with another object. The comparison order is:
* Category, Type, Lang. If all three are identical the other Identity is considered equal.
* Name is not used for comparision, as defined by XEP-0115
*
* @param obj
* @return
*/
public int compareTo(Object obj) {
DiscoverInfo.Identity other = (DiscoverInfo.Identity) obj;
String otherLang = other.lang == null ? "" : other.lang;
String thisLang = lang == null ? "" : lang;
if (category.equals(other.category)) {
if (type.equals(other.type)) {
if (thisLang.equals(otherLang)) {
// Don't compare on name, XEP-30 says that name SHOULD
// be equals for all identities of an entity
return 0;
} else {
return thisLang.compareTo(otherLang);
}
} else {
return type.compareTo(other.type);
}
} else {
return category.compareTo(other.category);
}
}
}
/**
* Represents the features offered by the item. This information helps requestors determine
* what actions are possible with regard to this item (registration, search, join, etc.)
* as well as specific feature types of interest, if any (e.g., for the purpose of feature
* negotiation).
*/
public static class Feature {
private String variable;
/**
* Creates a new feature offered by an XMPP entity or item.
*
* @param variable the feature's variable.
*/
public Feature(String variable) {
this.variable = variable;
}
/**
* Returns the feature's variable.
*
* @return the feature's variable.
*/
public String getVar() {
return variable;
}
public String toXML() {
StringBuilder buf = new StringBuilder();
buf.append("<feature var=\"").append(StringUtils.escapeForXML(variable)).append("\"/>");
return buf.toString();
}
public boolean equals(Object obj) {
if (obj == null)
return false;
if (obj == this)
return true;
if (obj.getClass() != getClass())
return false;
DiscoverInfo.Feature other = (DiscoverInfo.Feature) obj;
return variable.equals(other.variable);
}
}
}