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package com.android.printservicestubs;
import android.annotation.NonNull;
import android.annotation.Nullable;
import android.content.ContentProvider;
import android.content.ContentResolver;
import android.content.ContentValues;
import android.content.res.Configuration;
import android.database.*;
import android.net.Uri;
import android.util.Log;
import com.android.internal.util.Preconditions;
import com.android.printservicestubs.stubs.gcp.GoogleCloudPrintStub;
import com.android.printservicestubs.stubs.mdnsFilter.MDNSFilterStub;
import com.android.printservicestubs.stubs.mopria.MopriaStub;
import org.xmlpull.v1.XmlPullParserException;
import java.io.IOException;
import java.util.*;
/**
* Content provider for the {@link PrintServiceStub print service stubs}. Returns an {@link
* PrintServiceStubContract.PrintServiceStubs table} describing which stub found how many printers.
*/
public class PrintServiceStubProvider extends ContentProvider
implements RemotePrintServiceStub.OnChangedListener {
private final String LOG_TAG = "PrintServiceStubProv";
private ArrayList<RemotePrintServiceStub> mStubs;
private ContentResolver mContentResolver;
/**
* Initialize all {@link PrintServiceStub printer service stubs}.
*
* @return The list of stubs
*/
private @NonNull ArrayList<RemotePrintServiceStub> initStubs()
throws IOException, XmlPullParserException, RemotePrintServiceStub.StubException {
// Read the stubs defined in {@link R.xml#vendorconfigs vendorconfigs.xml}
Collection<VendorConfig> configs;
try {
configs = VendorConfig.getAllConfigs(getContext());
} catch (IOException | XmlPullParserException e) {
// {@link R.xml#vendorconfigs R.xml.vendorconfigs} is part of the file and parsed on
// each start. There should never be any error in this file.
throw new RuntimeException(e);
}
ArrayList<RemotePrintServiceStub> stubs = new ArrayList<>(configs.size());
// Add the stubs defined in {@link R.xml#vendorconfigs vendorconfigs.xml}
for (VendorConfig config : configs) {
if (!config.getMDNSNames().isEmpty()) {
Log.d(LOG_TAG, config.toString());
stubs.add(new RemotePrintServiceStub(
new MDNSFilterStub(getContext(), config.getName(),
config.getPackageName(), config.getMDNSNames()), this, false));
}
}
// Add non standard stubs
stubs.add(new RemotePrintServiceStub(new GoogleCloudPrintStub(getContext()), this,
true));
stubs.add(new RemotePrintServiceStub(new MopriaStub(getContext()), this, true));
return stubs;
}
@Override
public boolean onCreate() {
mContentResolver = getContext().getContentResolver();
try {
mStubs = initStubs();
final int numStubs = mStubs.size();
for (int i = 0; i < numStubs; i++) {
RemotePrintServiceStub stub = mStubs.get(i);
try {
stub.start();
} catch (RemotePrintServiceStub.StubException e) {
Log.e(LOG_TAG, "Could not start " + stub, e);
// Remove stub as it has issues
mStubs.remove(i);
i--;
}
}
return true;
} catch (Exception e) {
Log.e(LOG_TAG, "Could not initialize stubs", e);
return false;
}
}
@Override
public void shutdown() {
final int numStubs = mStubs.size();
for (int i = 0; i < numStubs; i++) {
RemotePrintServiceStub stub = mStubs.get(i);
try {
stub.stop();
} catch (RemotePrintServiceStub.StubException e) {
Log.e(LOG_TAG, "Could not stop " + stub, e);
// Remove stub as it has issues
mStubs.remove(i);
i--;
}
}
}
@Override
public void onChanged() {
mContentResolver
.notifyChange(PrintServiceStubContract.PrintServiceStubs.CONTENT_URI, null);
}
@Override
public Cursor query(@NonNull Uri uri, @Nullable String[] projection,
@Nullable String selection, @Nullable String[] selectionArgs,
@Nullable String sortOrder) {
// We only allow a very specific query
Preconditions.checkArgument(
PrintServiceStubContract.PrintServiceStubs.CONTENT_URI.equals(uri));
Preconditions.checkArgument(Arrays.equals(projection,
PrintServiceStubContract.PrintServiceStubs.ALL_COLUMNS));
Preconditions.checkArgument(selection == null);
Preconditions.checkArgument(selectionArgs == null);
Preconditions.checkArgument(
PrintServiceStubContract.PrintServiceStubs.DEFAULT_SORT_ORDER.equals(sortOrder));
MatrixCursor c = new MatrixCursor(new String[] {
PrintServiceStubContract.PrintServiceStubs.NAME,
PrintServiceStubContract.PrintServiceStubs.IS_MULTIVENDOR_SERVICE,
PrintServiceStubContract.PrintServiceStubs.NUM_DISCOVERED_PRINTERS,
PrintServiceStubContract.PrintServiceStubs.INSTALL_URI,
PrintServiceStubContract.PrintServiceStubs._ID
});
c.setNotificationUri(mContentResolver,
PrintServiceStubContract.PrintServiceStubs.CONTENT_URI);
final int numStubs = mStubs.size();
ArrayList<Object[]> data = new ArrayList<>(numStubs);
for (int i = 0; i < numStubs; i++) {
RemotePrintServiceStub stub = mStubs.get(i);
int numDiscoveredPrinters = stub.getNumPrinters();
if (numDiscoveredPrinters != 0) {
data.add(new Object[] {
stub.getName(),
stub.isMultiVendor() ? 1 : 0,
numDiscoveredPrinters,
stub.getInstallUri(),
Integer.valueOf(i).toString()
});
}
}
Collections.sort(data, new Comparator<Object[]>() {
@Override public int compare(Object[] o1, Object[] o2) {
int isMultiVendor1 = (int) o1[1];
int isMultiVendor2 = (int) o2[1];
int numDiscoveredPrinters1 = (int) o1[2];
int numDiscoveredPrinters2 = (int) o2[2];
// Sort by number of printers found first
int ret = numDiscoveredPrinters2 - numDiscoveredPrinters1;
// If this was not conclusive sort by multi-vendor or not
if (ret == 0) {
return isMultiVendor1 - isMultiVendor2;
} else {
return ret;
}
}
});
for (Object[] row : data) {
c.addRow(row);
}
return c;
}
@Override
public String getType(@NonNull Uri uri) {
return null;
}
@Override
public Uri insert(@NonNull Uri uri, @Nullable ContentValues values) {
throw new IllegalAccessError("Data cannot be inserted");
}
@Override
public int delete(@NonNull Uri uri, @Nullable String selection,
@Nullable String[] selectionArgs) {
throw new IllegalAccessError("Data cannot be deleted");
}
@Override
public int update(@NonNull Uri uri, @Nullable ContentValues values,
@Nullable String selection, @Nullable String[] selectionArgs) {
throw new IllegalAccessError("Data cannot be deleted");
}
}
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