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mirror of https://github.com/moparisthebest/k-9 synced 2024-11-14 05:25:07 -05:00
k-9/src/com/fsck/k9/provider/MessageProvider.java
Jesse Vincent f5eb6e03af astyle
2010-12-01 06:32:29 +00:00

1180 lines
34 KiB
Java

package com.fsck.k9.provider;
import java.lang.ref.WeakReference;
import java.util.ArrayList;
import java.util.Collections;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.Semaphore;
import java.util.concurrent.SynchronousQueue;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicBoolean;
import android.content.ContentProvider;
import android.content.ContentResolver;
import android.content.ContentValues;
import android.content.Context;
import android.content.UriMatcher;
import android.database.CharArrayBuffer;
import android.database.ContentObserver;
import android.database.CrossProcessCursor;
import android.database.Cursor;
import android.database.CursorWindow;
import android.database.DataSetObserver;
import android.database.MatrixCursor;
import android.net.Uri;
import android.os.Bundle;
import android.provider.BaseColumns;
import android.util.Log;
import com.fsck.k9.Account;
import com.fsck.k9.AccountStats;
import com.fsck.k9.K9;
import com.fsck.k9.Preferences;
import com.fsck.k9.SearchAccount;
import com.fsck.k9.activity.FolderInfoHolder;
import com.fsck.k9.activity.MessageInfoHolder;
import com.fsck.k9.activity.MessageList;
import com.fsck.k9.controller.MessagingController;
import com.fsck.k9.controller.MessagingListener;
import com.fsck.k9.helper.MessageHelper;
import com.fsck.k9.mail.Folder;
import com.fsck.k9.mail.Message;
import com.fsck.k9.mail.MessagingException;
import com.fsck.k9.mail.store.LocalStore;
public class MessageProvider extends ContentProvider
{
public static interface MessageColumns extends BaseColumns
{
/**
* The number of milliseconds since Jan. 1, 1970, midnight GMT.
*
* <P>Type: INTEGER (long)</P>
*/
String SEND_DATE = "date";
/**
* <P>Type: TEXT</P>
*/
String SENDER = "sender";
/**
* <P>Type: TEXT</P>
*/
String SUBJECT = "subject";
/**
* <P>Type: TEXT</P>
*/
String PREVIEW = "preview";
String ACCOUNT = "account";
String URI = "uri";
String DELETE_URI = "delUri";
/**
* @deprecated the field value is misnamed/misleading - present for compatibility purpose only. To be removed.
*/
@Deprecated
String INCREMENT = "id";
}
protected static interface QueryHandler
{
/**
* The path this instance is able to respond to.
*
* @return Never <code>null</code>.
*/
String getPath();
/**
* @param uri
* @param projection
* @param selection
* @param selectionArgs
* @param sortOrder
* @return
* @throws Exception
* @see {@link ContentProvider#query(Uri, String[], String, String[], String)}
*/
Cursor query(Uri uri, String[] projection,
String selection, String[] selectionArgs, String sortOrder) throws Exception;
}
/**
* Extracts a value from an object.
*
* @param <T>
* @param <K>
*/
public static interface FieldExtractor<T, K>
{
K getField(T source);
}
/**
* Extracts the {@link LocalStore.LocalMessage#getId() ID} from the given
* {@link MessageInfoHolder}. The underlying {@link Message} is expected to
* be a {@link LocalStore.LocalMessage}.
*/
public static class IdExtractor implements FieldExtractor<MessageInfoHolder, Long>
{
@Override
public Long getField(final MessageInfoHolder source)
{
return ((LocalStore.LocalMessage) source.message).getId();
}
}
public static class CountExtractor<T> implements FieldExtractor<T, Integer>
{
private Integer mCount;
public CountExtractor(final int count)
{
mCount = count;
}
@Override
public Integer getField(final T source)
{
return mCount;
}
}
public static class SubjectExtractor implements FieldExtractor<MessageInfoHolder, String>
{
@Override
public String getField(final MessageInfoHolder source)
{
return source.message.getSubject();
}
}
public static class SendDateExtractor implements FieldExtractor<MessageInfoHolder, Long>
{
@Override
public Long getField(final MessageInfoHolder source)
{
return source.message.getSentDate().getTime();
}
}
public static class PreviewExtractor implements FieldExtractor<MessageInfoHolder, String>
{
@Override
public String getField(final MessageInfoHolder source)
{
return source.message.getPreview();
}
}
public static class UriExtractor implements FieldExtractor<MessageInfoHolder, String>
{
@Override
public String getField(final MessageInfoHolder source)
{
return source.uri;
}
}
public static class DeleteUriExtractor implements FieldExtractor<MessageInfoHolder, String>
{
@Override
public String getField(final MessageInfoHolder source)
{
final Message message = source.message;
return CONTENT_URI + "/delete_message/"
+ message.getFolder().getAccount().getAccountNumber() + "/"
+ message.getFolder().getName() + "/" + message.getUid();
}
}
public static class SenderExtractor implements FieldExtractor<MessageInfoHolder, CharSequence>
{
@Override
public CharSequence getField(final MessageInfoHolder source)
{
return source.sender;
}
}
public static class AccountExtractor implements FieldExtractor<MessageInfoHolder, String>
{
@Override
public String getField(final MessageInfoHolder source)
{
return source.message.getFolder().getAccount().getDescription();
}
}
/**
* @deprecated having an incremential value has no real interest,
* implemented for compatibility only
*/
@Deprecated
// TODO remove
public static class IncrementExtractor implements FieldExtractor<MessageInfoHolder, Integer>
{
private int count = 0;
@Override
public Integer getField(final MessageInfoHolder source)
{
return count++;
}
}
/**
* Retrieve messages from the integrated inbox.
*/
protected class MessagesQueryHandler implements QueryHandler
{
@Override
public String getPath()
{
return "inbox_messages/";
}
@Override
public Cursor query(final Uri uri, final String[] projection, final String selection,
final String[] selectionArgs, final String sortOrder) throws Exception
{
return getMessages(projection);
}
/**
* @param projection
* Projection to use. If <code>null</code>, use the default
* projection.
* @return Never <code>null</code>.
* @throws InterruptedException
*/
protected MatrixCursor getMessages(final String[] projection) throws InterruptedException
{
final BlockingQueue<List<MessageInfoHolder>> queue = new SynchronousQueue<List<MessageInfoHolder>>();
// new code for integrated inbox, only execute this once as it will be processed afterwards via the listener
final SearchAccount integratedInboxAccount = new SearchAccount(getContext(), true, null, null);
final MessagingController msgController = MessagingController.getInstance(K9.app);
msgController.searchLocalMessages(integratedInboxAccount, null,
new MesssageInfoHolderRetrieverListener(queue));
final List<MessageInfoHolder> holders = queue.take();
// TODO add sort order parameter
Collections.sort(holders, new MessageList.ReverseComparator<MessageInfoHolder>(
new MessageList.DateComparator()));
final String[] projectionToUse;
if (projection == null)
{
projectionToUse = DEFAULT_MESSAGE_PROJECTION;
}
else
{
projectionToUse = projection;
}
final LinkedHashMap<String, FieldExtractor<MessageInfoHolder, ?>> extractors = resolveMessageExtractors(projectionToUse, holders.size());
final int fieldCount = extractors.size();
final String[] actualProjection = extractors.keySet().toArray(new String[fieldCount]);
final MatrixCursor cursor = new MatrixCursor(actualProjection);
for (final MessageInfoHolder holder : holders)
{
final Object[] o = new Object[fieldCount];
int i = 0;
for (final FieldExtractor<MessageInfoHolder, ?> extractor : extractors.values())
{
o[i] = extractor.getField(holder);
i += 1;
}
cursor.addRow(o);
}
return cursor;
}
// returns LinkedHashMap (rather than Map) to emphasize the inner element ordering
protected LinkedHashMap<String, FieldExtractor<MessageInfoHolder, ?>> resolveMessageExtractors(final String[] projection, int count)
{
final LinkedHashMap<String, FieldExtractor<MessageInfoHolder, ?>> extractors = new LinkedHashMap<String, FieldExtractor<MessageInfoHolder, ?>>();
for (final String field : projection)
{
if (extractors.containsKey(field))
{
continue;
}
if (MessageColumns._ID.equals(field))
{
extractors.put(field, new IdExtractor());
}
else if (MessageColumns._COUNT.equals(field))
{
extractors.put(field, new CountExtractor<MessageInfoHolder>(count));
}
else if (MessageColumns.SUBJECT.equals(field))
{
extractors.put(field, new SubjectExtractor());
}
else if (MessageColumns.SENDER.equals(field))
{
extractors.put(field, new SenderExtractor());
}
else if (MessageColumns.SEND_DATE.equals(field))
{
extractors.put(field, new SendDateExtractor());
}
else if (MessageColumns.PREVIEW.equals(field))
{
extractors.put(field, new PreviewExtractor());
}
else if (MessageColumns.URI.equals(field))
{
extractors.put(field, new UriExtractor());
}
else if (MessageColumns.DELETE_URI.equals(field))
{
extractors.put(field, new DeleteUriExtractor());
}
else if (MessageColumns.ACCOUNT.equals(field))
{
extractors.put(field, new AccountExtractor());
}
else if (MessageColumns.INCREMENT.equals(field))
{
extractors.put(field, new IncrementExtractor());
}
}
return extractors;
}
}
/**
* Retrieve the account list.
*/
protected class AccountsQueryHandler implements QueryHandler
{
@Override
public String getPath()
{
return "accounts";
}
@Override
public Cursor query(final Uri uri, String[] projection, String selection,
String[] selectionArgs, String sortOrder) throws Exception
{
return getAllAccounts();
}
public Cursor getAllAccounts()
{
String[] projection = new String[] { "accountNumber", "accountName" };
MatrixCursor ret = new MatrixCursor(projection);
for (Account account : Preferences.getPreferences(getContext()).getAccounts())
{
Object[] values = new Object[2];
values[0] = account.getAccountNumber();
values[1] = account.getDescription();
ret.addRow(values);
}
return ret;
}
}
/**
* Retrieve the unread message count for a given account specified by its
* {@link Account#getAccountNumber() number}.
*/
protected class UnreadQueryHandler implements QueryHandler
{
@Override
public String getPath()
{
return "account_unread/#";
}
@Override
public Cursor query(final Uri uri, String[] projection, String selection,
String[] selectionArgs, String sortOrder) throws Exception
{
List<String> segments = null;
int accountId = -1;
segments = uri.getPathSegments();
accountId = Integer.parseInt(segments.get(1));
return getAccountUnread(accountId);
}
public Cursor getAccountUnread(int accountNumber)
{
String[] projection = new String[] { "accountName", "unread" };
MatrixCursor ret = new MatrixCursor(projection);
Account myAccount;
AccountStats myAccountStats = null;
Object[] values = new Object[2];
for (Account account : Preferences.getPreferences(getContext()).getAvailableAccounts())
{
if (account.getAccountNumber()==accountNumber)
{
myAccount = account;
try
{
myAccountStats = account.getStats(getContext());
values[0] = myAccount.getDescription();
if (myAccountStats == null)
{
values[1] = 0;
}
else
{
values[1] = myAccountStats.unreadMessageCount;
}
ret.addRow(values);
}
catch (MessagingException e)
{
Log.e(K9.LOG_TAG, e.getMessage());
values[0] = "Unknown";
values[1] = 0;
}
}
}
return ret;
}
}
/**
* Cursor wrapper that release a semaphore on close. Close is also triggered
* on {@link #finalize()}.
*/
protected static class MonitoredCursor implements CrossProcessCursor
{
/**
* The underlying cursor implementation that handles regular
* requests
*/
private CrossProcessCursor mCursor;
/**
* Whether {@link #close()} was invoked
*/
private AtomicBoolean mClosed = new AtomicBoolean(false);
private Semaphore mSemaphore;
/**
* @param cursor
* Never <code>null</code>.
* @param semaphore
* The semaphore to release on close. Never
* <code>null</code>.
*/
protected MonitoredCursor(final CrossProcessCursor cursor, final Semaphore semaphore)
{
this.mCursor = cursor;
this.mSemaphore = semaphore;
}
/* (non-Javadoc)
*
* Close the underlying cursor and dereference it.
*
* @see android.database.Cursor#close()
*/
@Override
public void close()
{
if (mClosed.compareAndSet(false, true))
{
mCursor.close();
Log.d(K9.LOG_TAG, "Cursor closed, null'ing & releasing semaphore");
mCursor = null;
mSemaphore.release();
}
}
@Override
public boolean isClosed()
{
return mClosed.get() || mCursor.isClosed();
}
/* (non-Javadoc)
*
* Making sure cursor gets closed on garbage collection
*
* @see java.lang.Object#finalize()
*/
@Override
protected void finalize() throws Throwable
{
close();
super.finalize();
}
protected void checkClosed() throws IllegalStateException
{
if (mClosed.get())
{
throw new IllegalStateException("Cursor was closed");
}
}
@Override
public void fillWindow(int pos, CursorWindow winow)
{
checkClosed();
mCursor.fillWindow(pos, winow);
}
@Override
public CursorWindow getWindow()
{
checkClosed();
return mCursor.getWindow();
}
@Override
public boolean onMove(int oldPosition, int newPosition)
{
checkClosed();
return mCursor.onMove(oldPosition, newPosition);
}
@Override
public void copyStringToBuffer(int columnIndex, CharArrayBuffer buffer)
{
checkClosed();
mCursor.copyStringToBuffer(columnIndex, buffer);
}
@Override
public void deactivate()
{
checkClosed();
mCursor.deactivate();
}
@Override
public byte[] getBlob(int columnIndex)
{
checkClosed();
return mCursor.getBlob(columnIndex);
}
@Override
public int getColumnCount()
{
checkClosed();
return mCursor.getColumnCount();
}
@Override
public int getColumnIndex(String columnName)
{
checkClosed();
return mCursor.getColumnIndex(columnName);
}
@Override
public int getColumnIndexOrThrow(String columnName) throws IllegalArgumentException
{
checkClosed();
return mCursor.getColumnIndexOrThrow(columnName);
}
@Override
public String getColumnName(int columnIndex)
{
checkClosed();
return mCursor.getColumnName(columnIndex);
}
@Override
public String[] getColumnNames()
{
checkClosed();
return mCursor.getColumnNames();
}
@Override
public int getCount()
{
checkClosed();
return mCursor.getCount();
}
@Override
public double getDouble(int columnIndex)
{
checkClosed();
return mCursor.getDouble(columnIndex);
}
@Override
public Bundle getExtras()
{
checkClosed();
return mCursor.getExtras();
}
@Override
public float getFloat(int columnIndex)
{
checkClosed();
return mCursor.getFloat(columnIndex);
}
@Override
public int getInt(int columnIndex)
{
checkClosed();
return mCursor.getInt(columnIndex);
}
@Override
public long getLong(int columnIndex)
{
checkClosed();
return mCursor.getLong(columnIndex);
}
@Override
public int getPosition()
{
checkClosed();
return mCursor.getPosition();
}
@Override
public short getShort(int columnIndex)
{
checkClosed();
return mCursor.getShort(columnIndex);
}
@Override
public String getString(int columnIndex)
{
checkClosed();
return mCursor.getString(columnIndex);
}
@Override
public boolean getWantsAllOnMoveCalls()
{
checkClosed();
return mCursor.getWantsAllOnMoveCalls();
}
@Override
public boolean isAfterLast()
{
checkClosed();
return mCursor.isAfterLast();
}
@Override
public boolean isBeforeFirst()
{
checkClosed();
return mCursor.isBeforeFirst();
}
@Override
public boolean isFirst()
{
checkClosed();
return mCursor.isFirst();
}
public boolean isLast()
{
checkClosed();
return mCursor.isLast();
}
@Override
public boolean isNull(int columnIndex)
{
checkClosed();
return mCursor.isNull(columnIndex);
}
@Override
public boolean move(int offset)
{
checkClosed();
return mCursor.move(offset);
}
@Override
public boolean moveToFirst()
{
checkClosed();
return mCursor.moveToFirst();
}
@Override
public boolean moveToLast()
{
checkClosed();
return mCursor.moveToLast();
}
@Override
public boolean moveToNext()
{
checkClosed();
return mCursor.moveToNext();
}
@Override
public boolean moveToPosition(int position)
{
checkClosed();
return mCursor.moveToPosition(position);
}
@Override
public boolean moveToPrevious()
{
checkClosed();
return mCursor.moveToPrevious();
}
@Override
public void registerContentObserver(ContentObserver observer)
{
checkClosed();
mCursor.registerContentObserver(observer);
}
@Override
public void registerDataSetObserver(DataSetObserver observer)
{
checkClosed();
mCursor.registerDataSetObserver(observer);
}
@Override
public boolean requery()
{
checkClosed();
return mCursor.requery();
}
@Override
public Bundle respond(Bundle extras)
{
checkClosed();
return mCursor.respond(extras);
}
@Override
public void setNotificationUri(ContentResolver cr, Uri uri)
{
checkClosed();
mCursor.setNotificationUri(cr, uri);
}
@Override
public void unregisterContentObserver(ContentObserver observer)
{
checkClosed();
mCursor.unregisterContentObserver(observer);
}
@Override
public void unregisterDataSetObserver(DataSetObserver observer)
{
checkClosed();
mCursor.unregisterDataSetObserver(observer);
}
}
protected class ThrottlingQueryHandler implements QueryHandler
{
private QueryHandler mDelegate;
public ThrottlingQueryHandler(final QueryHandler delegate)
{
mDelegate = delegate;
}
@Override
public String getPath()
{
return mDelegate.getPath();
}
@Override
public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs,
String sortOrder) throws Exception
{
mSemaphore.acquire();
final Cursor cursor;
cursor = mDelegate.query(uri, projection, selection, selectionArgs, sortOrder);
/* Android content resolvers can only process CrossProcessCursor instances */
if (!(cursor instanceof CrossProcessCursor))
{
Log.w(K9.LOG_TAG, "Unsupported cursor, returning null: " + cursor);
return null;
}
final MonitoredCursor wrapped = new MonitoredCursor((CrossProcessCursor) cursor, mSemaphore);
/* use a weak reference not to actively prevent garbage collection */
final WeakReference<MonitoredCursor> weakReference = new WeakReference<MonitoredCursor>(wrapped);
/* make sure the cursor is closed after 30 seconds */
mScheduledPool.schedule(new Runnable()
{
@Override
public void run()
{
final MonitoredCursor monitored = weakReference.get();
if (monitored != null && !monitored.isClosed())
{
Log.w(K9.LOG_TAG, "Forcibly closing remotely exposed cursor");
try
{
monitored.close();
}
catch (Exception e)
{
Log.w(K9.LOG_TAG, "Exception while forcibly closing cursor", e);
}
}
}
}, 30, TimeUnit.SECONDS);
return wrapped;
}
}
/**
* Synchronized listener used to retrieve {@link MessageInfoHolder}s using a
* given {@link BlockingQueue}.
*/
protected class MesssageInfoHolderRetrieverListener extends MessagingListener
{
private final BlockingQueue<List<MessageInfoHolder>> queue;
private List<MessageInfoHolder> mHolders = new ArrayList<MessageInfoHolder>();
/**
* @param queue
* Never <code>null</code>. The synchronized channel to use
* to retrieve {@link MessageInfoHolder}s.
*/
public MesssageInfoHolderRetrieverListener(final BlockingQueue<List<MessageInfoHolder>> queue)
{
this.queue = queue;
}
@Override
public void listLocalMessagesAddMessages(final Account account,
final String folderName, final List<Message> messages)
{
// cache fields into local variables for faster access on JVM without JIT
final MessageHelper helper = mMessageHelper;
final List<MessageInfoHolder> holders = mHolders;
final Context context = getContext();
for (final Message message : messages)
{
final MessageInfoHolder messageInfoHolder = new MessageInfoHolder();
final Folder messageFolder = message.getFolder();
final Account messageAccount = messageFolder.getAccount();
helper.populate(messageInfoHolder, message, new FolderInfoHolder(context,
messageFolder, messageAccount), messageAccount);
holders.add(messageInfoHolder);
}
}
@Override
public void searchStats(AccountStats stats)
{
try
{
queue.put(mHolders);
}
catch (InterruptedException e)
{
Log.e(K9.LOG_TAG, "Unable to return message list back to caller", e);
}
}
}
public static final String AUTHORITY = "com.fsck.k9.messageprovider";
public static final Uri CONTENT_URI = Uri.parse("content://" + AUTHORITY);
private static final String[] DEFAULT_MESSAGE_PROJECTION = new String[]
{
MessageColumns._ID,
MessageColumns.SEND_DATE,
MessageColumns.SENDER,
MessageColumns.SUBJECT,
MessageColumns.PREVIEW,
MessageColumns.ACCOUNT,
MessageColumns.URI,
MessageColumns.DELETE_URI
};
/**
* URI matcher used for
* {@link #query(Uri, String[], String, String[], String)}
*/
private UriMatcher mUriMatcher = new UriMatcher(UriMatcher.NO_MATCH);
/**
* Handlers registered to respond to
* {@link #query(Uri, String[], String, String[], String)}
*/
private List<QueryHandler> mQueryHandlers = new ArrayList<QueryHandler>();
private MessageHelper mMessageHelper;
/**
* How many simultaneous cursors we can affort to expose at once
*/
/* package */
Semaphore mSemaphore = new Semaphore(1);
/* package */
ScheduledExecutorService mScheduledPool = Executors.newScheduledThreadPool(1);
@Override
public boolean onCreate()
{
mMessageHelper = MessageHelper.getInstance(getContext());
registerQueryHandler(new ThrottlingQueryHandler(new AccountsQueryHandler()));
registerQueryHandler(new ThrottlingQueryHandler(new MessagesQueryHandler()));
registerQueryHandler(new ThrottlingQueryHandler(new UnreadQueryHandler()));
K9.registerApplicationAware(new K9.ApplicationAware()
{
@Override
public void initializeComponent(final K9 application)
{
Log.v(K9.LOG_TAG, "Registering content resolver notifier");
MessagingController.getInstance(application).addListener(new MessagingListener()
{
@Override
public void searchStats(final AccountStats stats)
{
application.getContentResolver().notifyChange(CONTENT_URI, null);
}
});
}
});
return true;
}
@Override
public int delete(Uri uri, String selection, String[] selectionArgs)
{
if (K9.app == null)
{
return 0;
}
if (K9.DEBUG)
{
Log.v(K9.LOG_TAG, "MessageProvider/delete: " + uri);
}
// Nota : can only delete a message
List<String> segments = null;
int accountId = -1;
String folderName = null;
String msgUid = null;
segments = uri.getPathSegments();
accountId = Integer.parseInt(segments.get(1));
folderName = segments.get(2);
msgUid = segments.get(3);
// get account
Account myAccount = null;
for (Account account : Preferences.getPreferences(getContext()).getAccounts())
{
if (account.getAccountNumber() == accountId)
{
myAccount = account;
if (!account.isAvailable(getContext()))
{
Log.w(K9.LOG_TAG, "not deleting messages because account is unavailable at the moment");
return 0;
}
}
}
// get localstore parameter
Message msg = null;
try
{
Folder lf = LocalStore.getLocalInstance(myAccount, K9.app).getFolder(folderName);
int msgCount = lf.getMessageCount();
if (K9.DEBUG)
{
Log.d(K9.LOG_TAG, "folder msg count = " + msgCount);
}
msg = lf.getMessage(msgUid);
}
catch (MessagingException e)
{
Log.e(K9.LOG_TAG, "Unable to retrieve message", e);
}
// launch command to delete the message
if ((myAccount != null) && (msg != null))
{
MessagingController.getInstance(K9.app).deleteMessages(new Message[] { msg }, null);
}
// FIXME return the actual number of deleted messages
return 0;
}
@Override
public String getType(Uri uri)
{
if (K9.app == null)
{
return null;
}
if (K9.DEBUG)
{
Log.v(K9.LOG_TAG, "MessageProvider/getType: " + uri);
}
return null;
}
@Override
public Uri insert(Uri uri, ContentValues values)
{
if (K9.app == null)
{
return null;
}
if (K9.DEBUG)
{
Log.v(K9.LOG_TAG, "MessageProvider/insert: " + uri);
}
return null;
}
@Override
public Cursor query(final Uri uri, final String[] projection, final String selection,
final String[] selectionArgs, final String sortOrder)
{
if (K9.app == null)
{
return null;
}
if (K9.DEBUG)
{
Log.v(K9.LOG_TAG, "MessageProvider/query: " + uri);
}
final Cursor cursor;
final int code = mUriMatcher.match(uri);
if (code == -1)
{
throw new IllegalStateException("Unrecognized URI: " + uri);
}
try
{
// since we used the list index as the UriMatcher code, using it
// back to retrieve the handler from the list
final QueryHandler handler = mQueryHandlers.get(code);
cursor = handler.query(uri, projection, selection, selectionArgs, sortOrder);
}
catch (Exception e)
{
Log.e(K9.LOG_TAG, "Unable to execute query for URI: " + uri, e);
return null;
}
return cursor;
}
@Override
public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs)
{
if (K9.app == null)
{
return 0;
}
if (K9.DEBUG)
{
Log.v(K9.LOG_TAG, "MessageProvider/update: " + uri);
}
//TBD
return 0;
}
/**
* Register a {@link QueryHandler} to handle a certain {@link Uri} for
* {@link #query(Uri, String[], String, String[], String)}
*
* @param handler
* Never <code>null</code>.
*/
protected void registerQueryHandler(final QueryHandler handler)
{
if (mQueryHandlers.contains(handler))
{
return;
}
mQueryHandlers.add(handler);
// use the index inside the list as the UriMatcher code for that handler
final int code = mQueryHandlers.indexOf(handler);
mUriMatcher.addURI(AUTHORITY, handler.getPath(), code);
}
}