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/*
* Copyright (c) 2015 Isode Limited.
* All rights reserved.
* See the COPYING file for more information.
*/
/*
* Copyright (c) 2015 Tarun Gupta.
* Licensed under the simplified BSD license.
* See Documentation/Licenses/BSD-simplified.txt for more information.
*/
package com.isode.stroke.disco;
import com.isode.stroke.base.Tristate;
import com.isode.stroke.elements.DiscoInfo;
import com.isode.stroke.elements.Presence;
import com.isode.stroke.jid.JID;
import com.isode.stroke.disco.EntityCapsProvider;
import com.isode.stroke.presence.PresenceOracle;
import com.isode.stroke.filetransfer.FileTransferManager;
import java.util.List;
import java.util.ArrayList;
import java.util.Collection;
public class FeatureOracle {
private EntityCapsProvider capsProvider_;
private PresenceOracle presenceOracle_;
public FeatureOracle(EntityCapsProvider capsProvider, PresenceOracle presenceOracle) {
this.capsProvider_ = capsProvider;
this.presenceOracle_ = presenceOracle;
}
public Tristate isFileTransferSupported(JID jid) {
DiscoInfo discoInfo = getDiscoResultForJID(jid);
if (discoInfo != null) {
return FileTransferManager.isSupportedBy(discoInfo) ? Tristate.Yes : Tristate.No;
}
else {
return Tristate.Maybe;
}
}
public Tristate isMessageReceiptsSupported(JID jid) {
return isFeatureSupported(jid, DiscoInfo.MessageDeliveryReceiptsFeature);
}
public Tristate isMessageCorrectionSupported(JID jid) {
return isFeatureSupported(jid, DiscoInfo.MessageCorrectionFeature);
}
/**
* @brief getDiscoResultForJID returns a shared reference to a DiscoInfo representing features supported by the jid.
* @param jid The JID to return the DiscoInfo for.
* @return DiscoResult.
*/
private DiscoInfo getDiscoResultForJID(JID jid) {
DiscoInfo discoInfo;
if (jid.isBare()) {
// Calculate the common subset of disco features of all available results and return that.
Collection<Presence> availablePresences = presenceOracle_.getAllPresence(jid);
boolean commonFeaturesInitialized = false;
List<String> commonFeatures = new ArrayList<String>();
for(Presence presence : availablePresences) {
DiscoInfo presenceDiscoInfo = capsProvider_.getCaps(presence.getFrom());
if (presenceDiscoInfo != null) {
List<String> features = presenceDiscoInfo.getFeatures();
if (!commonFeaturesInitialized) {
commonFeatures = features;
commonFeaturesInitialized = true;
}
else {
List<String> featuresToRemove = new ArrayList<String>();
for(String feature : commonFeatures) {
if(!features.contains(feature)) {
featuresToRemove.add(feature);
}
}
for(String featureToRemove : featuresToRemove) {
while(commonFeatures.contains(featureToRemove)) {
commonFeatures.remove(featureToRemove);
}
}
}
}
}
discoInfo = new DiscoInfo();
for(String commonFeature : commonFeatures) {
discoInfo.addFeature(commonFeature);
}
}
else {
// Return the disco result of the full JID.
discoInfo = capsProvider_.getCaps(jid);
}
return discoInfo;
}
private Tristate isFeatureSupported(JID jid, String feature) {
DiscoInfo discoInfo = getDiscoResultForJID(jid);
if (discoInfo != null) {
return discoInfo.hasFeature(feature) ? Tristate.Yes : Tristate.No;
}
else {
return Tristate.Maybe;
}
}
}
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