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/*
* Copyright (C) 2016 The Android Open Source Project
*
* 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 com.xerox.printservicerecommendationplugin;
import android.content.Context;
import android.net.nsd.NsdManager;
import android.net.nsd.NsdServiceInfo;
import android.text.TextUtils;
import java.util.ArrayList;
import java.util.LinkedList;
import java.util.List;
public class ServiceResolver {
private final NsdManager mNSDManager;
private final String[] mServiceType;
private final Observer mObserver;
private final VendorInfo mVendorInfo;
private final String[] mPDLs;
private final PrinterHashMap mPrinterHashMap = new PrinterHashMap();
private final List<NsdManager.DiscoveryListener> mListeners = new ArrayList<>();
public interface Observer {
void dataSetChanged();
}
public ServiceResolver(Context context, Observer observer, VendorInfo vendorInfo, String[] serviceTypes, String[] pdls) {
mObserver = observer;
mServiceType = serviceTypes;
mNSDManager = (NsdManager) context.getSystemService(Context.NSD_SERVICE);
mVendorInfo = vendorInfo;
mPDLs = pdls;
}
public void start() {
stop();
for (final String service : mServiceType) {
NsdManager.DiscoveryListener listener = new NsdManager.DiscoveryListener() {
@Override
public void onStartDiscoveryFailed(String s, int i) {
}
@Override
public void onStopDiscoveryFailed(String s, int i) {
}
@Override
public void onDiscoveryStarted(String s) {
}
@Override
public void onDiscoveryStopped(String s) {
}
@Override
public void onServiceFound(NsdServiceInfo nsdServiceInfo) {
queueRequest(nsdServiceInfo);
}
@Override
public void onServiceLost(NsdServiceInfo nsdServiceInfo) {
removeRequest(nsdServiceInfo);
printerRemoved(nsdServiceInfo);
}
};
mNSDManager.discoverServices(service, NsdManager.PROTOCOL_DNS_SD, listener);
mListeners.add(listener);
}
}
public void stop() {
for (NsdManager.DiscoveryListener listener : mListeners) {
mNSDManager.stopServiceDiscovery(listener);
}
mListeners.clear();
clearRequests();
}
//Resolving nsd services
private final LinkedList<NsdServiceInfo> mQueue = new LinkedList<>();
private final Object mLock = new Object();
private NsdServiceInfo mCurrentRequest = null;
private void queueRequest(NsdServiceInfo serviceInfo) {
synchronized (mLock) {
if (mQueue.contains(serviceInfo)) return;
mQueue.add(serviceInfo);
makeNextRequest();
}
}
private void removeRequest(NsdServiceInfo serviceInfo) {
synchronized (mLock) {
mQueue.remove(serviceInfo);
if ((mCurrentRequest != null) && serviceInfo.equals(mCurrentRequest))
mCurrentRequest = null;
}
}
private void clearRequests() {
synchronized (mLock) {
mQueue.clear();
}
}
private void makeNextRequest() {
synchronized (mLock) {
if (mCurrentRequest != null) return;
if (mQueue.isEmpty()) return;
mCurrentRequest = mQueue.removeFirst();
mNSDManager.resolveService(mCurrentRequest, new NsdManager.ResolveListener() {
@Override
public void onResolveFailed(NsdServiceInfo nsdServiceInfo, int i) {
synchronized (mLock) {
if (mCurrentRequest != null) mQueue.add(mCurrentRequest);
makeNextRequest();
}
}
@Override
public void onServiceResolved(NsdServiceInfo nsdServiceInfo) {
synchronized (mLock) {
if (mCurrentRequest != null) {
printerFound(nsdServiceInfo);
mCurrentRequest = null;
}
makeNextRequest();
}
}
});
}
}
private void printerFound(NsdServiceInfo nsdServiceInfo) {
if (nsdServiceInfo == null) return;
if (TextUtils.isEmpty(PrinterHashMap.getKey(nsdServiceInfo))) return;
String vendor = MDnsUtils.getVendor(nsdServiceInfo);
if (vendor == null) vendor = "";
for (String vendorValues : mVendorInfo.mDNSValues) {
if (vendor.equalsIgnoreCase(vendorValues)) {
vendor = mVendorInfo.mVendorID;
break;
}
}
if ((vendor != mVendorInfo.mVendorID) &&
MDnsUtils.isVendorPrinter(nsdServiceInfo, mVendorInfo.mDNSValues)) {
vendor = mVendorInfo.mVendorID;
}
if (!(vendor == mVendorInfo.mVendorID)) {
return;
}
if (!MDnsUtils.checkPDLSupport(nsdServiceInfo, mPDLs)) {
return;
}
if ((mPrinterHashMap.addPrinter(nsdServiceInfo) == null)) {
mObserver.dataSetChanged();
}
}
private void printerRemoved(NsdServiceInfo nsdServiceInfo) {
if ((mPrinterHashMap.removePrinter(nsdServiceInfo) != null)) {
mObserver.dataSetChanged();
}
}
public int getCount() {
return mPrinterHashMap.size();
}
}
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