samples/VoicemailProviderDemo/src/com/example/android/voicemail/common/core/VoicemailProviderHelper.java

/*
 * Copyright (C) 2011 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.example.android.voicemail.common.core;

import android.provider.VoicemailContract;

import android.net.Uri;

import java.io.IOException;
import java.io.InputStream;
import java.util.List;

/**
 * Provides a simple interface to manipulate voicemails within the voicemail content provider.
 * <p>
 * Methods on this interface throw checked exceptions only where the corresponding underlying
 * methods perform an operation that itself requires a checked exception. In all other cases a
 * {@link RuntimeException} will be thrown here.
 * <p>
 * These methods are blocking, and will return control to the caller only when the operation
 * completes. You should not call any of these methods from your main ui thread, as this may result
 * in your application becoming unresponsive.
 */
public interface VoicemailProviderHelper {

    /** Sort order to return results by. */
    public enum SortOrder {
        ASCENDING,
        DESCENDING,
        /** Default sort order returned by DB. (Typically Ascending, but no guarantees made). */
        DEFAULT
    }

    /**
     * Clears all voicemails accessible to this voicemail content provider.
     *
     * @return the number of voicemails deleted
     */
    public int deleteAll();

    /**
     * Inserts a new voicemail into the voicemail content provider.
     *
     * @param voicemail data to be inserted
     * @return {@link Uri} of the newly inserted {@link Voicemail}
     * @throws IllegalArgumentException if any of the following are true:
     *         <ul>
     *         <li>your voicemail is missing a timestamp</li>
     *         <li>your voiceamil is missing a number</li>
     *         <li>your voicemail is missing the provider id field</li>
     *         <li>voicemail has an id (which would indicate that it has already been inserted)
     *         </li>
     *         </ul>
     */
    public Uri insert(Voicemail voicemail);

    /**
     * Returns the {@link Voicemail} whose provider data matches the given value.
     * <p>
     * It is expected that there be one such voicemail. Returns null if no such voicemail exists,
     * and returns one chosen arbitrarily if more than one exists.
     */
    public Voicemail findVoicemailBySourceData(String providerData);

    /**
     * Returns the {@link Voicemail} corresponding to a given Uri. The uri must correspond to a
     * unique voicemail record.
     * <p>
     * Returns null if no voicemail was found that exactly matched the given uri.
     */
    public Voicemail findVoicemailByUri(Uri uri);

    /**
     * Updates an existing voicemail in the content provider.
     * <p>
     * Note that <b>only the fields that are set</b> on the {@link Voicemail} that you provide will
     * be used to perform the update. The remaining fields will be left unmodified. To mark a
     * voicemail as read, create a new {@link Voicemail} that is marked as read, and call update.
     *
     * @throws IllegalArgumentException if you provide a {@link Voicemail} that already has a Uri
     *             set, because we don't support altering the Uri of a voicemail, and this most
     *             likely implies that you're using this api incorrectly
     * @return the number of rows that were updated
     */
    public int update(Uri uri, Voicemail voicemail);

    /**
     * Sets the voicemail content from the supplied input stream.
     * <p>
     * The inputStream is owned by the caller and must be closed by it as usual after the call has
     * returned.
     *
     * @throws IOException if there is a problem creating the file or no voicemail is found matching
     *             the given Uri
     */
    public void setVoicemailContent(Uri voicemailUri, InputStream inputStream, String mimeType)
            throws IOException;

    /**
     * Sets the voicemail content from the supplied byte array.
     *
     * @throws IOException if there is a problem creating the file or no voicemail is found matching
     *             the given Uri
     */
    public void setVoicemailContent(Uri voicemailUri, byte[] inputBytes, String mimeType)
            throws IOException;

    /**
     * Fetch all the voicemails accessible to this voicemail content provider.
     *
     * @return the list of voicemails, no guarantee is made about the ordering
     */
    public List<Voicemail> getAllVoicemails();

    /**
     * Same as {@link #getAllVoicemails()} but also sorts them by the requested column and allows to
     * set a filter.
     *
     * @param filter The filter to apply while retrieving voicemails.
     * @param sortColumn The column to sort by. Must be one of the values defined in
     *            {@link VoicemailContract.Voicemails}.
     * @param sortOrder Order to sort by
     * @return the list of voicemails, sorted by the requested DB column in specified sort order.
     */
    public List<Voicemail> getAllVoicemails(VoicemailFilter filter,
            String sortColumn, SortOrder sortOrder);

    /**
     * Returns the Uri for the voicemail with the specified message Id.
     */
    public Uri getUriForVoicemailWithId(long id);
}