1 /* 2 * Copyright (C) 2009 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.android.quicksearchbox; 18 19 import com.android.quicksearchbox.util.Consumer; 20 import com.android.quicksearchbox.util.Consumers; 21 import com.android.quicksearchbox.util.NamedTask; 22 import com.android.quicksearchbox.util.NamedTaskExecutor; 23 24 import android.os.Handler; 25 import android.util.Log; 26 27 /** 28 * A task that gets suggestions from a corpus. 29 */ 30 public class QueryTask<C extends SuggestionCursor> implements NamedTask { 31 private static final String TAG = "QSB.QueryTask"; 32 private static final boolean DBG = false; 33 34 private final String mQuery; 35 private final int mQueryLimit; 36 private final SuggestionCursorProvider<C> mProvider; 37 private final Handler mHandler; 38 private final Consumer<C> mConsumer; 39 40 /** 41 * Creates a new query task. 42 * 43 * @param query Query to run. 44 * @param queryLimit The number of suggestions to ask each provider for. 45 * @param provider The provider to ask for suggestions. 46 * @param handler Handler that {@link Consumer#consume} will 47 * get called on. If null, the method is called on the query thread. 48 * @param consumer Consumer to notify when the suggestions have been returned. 49 */ QueryTask(String query, int queryLimit, SuggestionCursorProvider<C> provider, Handler handler, Consumer<C> consumer)50 public QueryTask(String query, int queryLimit, SuggestionCursorProvider<C> provider, 51 Handler handler, Consumer<C> consumer) { 52 mQuery = query; 53 mQueryLimit = queryLimit; 54 mProvider = provider; 55 mHandler = handler; 56 mConsumer = consumer; 57 } 58 59 @Override getName()60 public String getName() { 61 return mProvider.getName(); 62 } 63 64 @Override run()65 public void run() { 66 final C cursor = mProvider.getSuggestions(mQuery, mQueryLimit); 67 if (DBG) Log.d(TAG, "Suggestions from " + mProvider + " = " + cursor); 68 Consumers.consumeCloseableAsync(mHandler, mConsumer, cursor); 69 } 70 71 @Override toString()72 public String toString() { 73 return mProvider + "[" + mQuery + "]"; 74 } 75 startQuery(String query, int maxResults, SuggestionCursorProvider<C> provider, NamedTaskExecutor executor, Handler handler, Consumer<C> consumer)76 public static <C extends SuggestionCursor> void startQuery(String query, 77 int maxResults, 78 SuggestionCursorProvider<C> provider, 79 NamedTaskExecutor executor, Handler handler, 80 Consumer<C> consumer) { 81 82 QueryTask<C> task = new QueryTask<C>(query, maxResults, provider, handler, 83 consumer); 84 executor.execute(task); 85 } 86 } 87