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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.android.printservice.recommendation.plugin.mdnsFilter;
import android.content.Context;
import android.net.nsd.NsdServiceInfo;
import androidx.annotation.NonNull;
import androidx.annotation.StringRes;
import com.android.printservice.recommendation.PrintServicePlugin;
import com.android.printservice.recommendation.util.MDNSFilteredDiscovery;
import com.android.printservice.recommendation.util.MDNSUtils;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
/**
* A plugin listening for mDNS results and only adding the ones that {@link
* MDNSUtils#isVendorPrinter match} configured list
*/
public class MDNSFilterPlugin implements PrintServicePlugin {
/** The mDNS service types supported */
private static final Set<String> PRINTER_SERVICE_TYPES = new HashSet<String>() {{
add("_ipp._tcp");
}};
/**
* The printer filter for {@link MDNSFilteredDiscovery} passing only mDNS results
* that {@link MDNSUtils#isVendorPrinter match} configured list
*/
private static class VendorNameFilter implements MDNSFilteredDiscovery.PrinterFilter {
/** mDNS names handled by the print service this plugin is for */
private final @NonNull Set<String> mMDNSNames;
/**
* Filter constructor
*
* @param vendorNames The vendor names to pass
*/
VendorNameFilter(@NonNull Set<String> vendorNames) {
mMDNSNames = new HashSet<>(vendorNames);
}
@Override
public boolean matchesCriteria(NsdServiceInfo nsdServiceInfo) {
return MDNSUtils.isVendorPrinter(nsdServiceInfo, mMDNSNames);
}
}
/** Name of the print service this plugin is for */
private final @StringRes int mName;
/** Package name of the print service this plugin is for */
private final @NonNull CharSequence mPackageName;
/** The mDNS filtered discovery */
private final MDNSFilteredDiscovery mMDNSFilteredDiscovery;
/**
* Create new stub that assumes that a print service can be used to print on all mPrinters
* matching some mDNS names.
*
* @param context The context the plugin runs in
* @param name The user friendly name of the print service
* @param packageName The package name of the print service
* @param mDNSNames The mDNS names of the printer.
*/
public MDNSFilterPlugin(@NonNull Context context, @NonNull String name,
@NonNull CharSequence packageName, @NonNull List<String> mDNSNames) {
mName = context.getResources().getIdentifier(name, null,
"com.android.printservice.recommendation");
mPackageName = packageName;
mMDNSFilteredDiscovery = new MDNSFilteredDiscovery(context, PRINTER_SERVICE_TYPES,
new VendorNameFilter(new HashSet<>(mDNSNames)));
}
@Override
public @NonNull CharSequence getPackageName() {
return mPackageName;
}
@Override
public void start(@NonNull PrinterDiscoveryCallback callback) throws Exception {
mMDNSFilteredDiscovery.start(callback);
}
@Override
public @StringRes int getName() {
return mName;
}
@Override
public void stop() throws Exception {
mMDNSFilteredDiscovery.stop();
}
}
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