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      1 /*
      2  * Copyright (C) 2017 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 androidx.contentpager.content;
     18 
     19 import static org.junit.Assert.assertEquals;
     20 import static org.junit.Assert.assertNotNull;
     21 import static org.junit.Assert.assertTrue;
     22 
     23 import android.database.Cursor;
     24 import android.database.MatrixCursor;
     25 import android.net.Uri;
     26 import android.os.Bundle;
     27 
     28 import androidx.annotation.Nullable;
     29 import androidx.core.util.Pair;
     30 
     31 import java.util.ArrayList;
     32 import java.util.List;
     33 import java.util.concurrent.CountDownLatch;
     34 import java.util.concurrent.TimeUnit;
     35 
     36 final class TestQueryCallback implements ContentPager.QueryRunner.Callback {
     37 
     38     private static final String URI_KEY = "testUri";
     39     private static final String URI_PAGE_ID = "testPageId";
     40 
     41     private CollectorLatch<Query> mQueryLatch;
     42     private CollectorLatch<Pair<Integer, Cursor>> mReplyLatch;
     43 
     44     @Override
     45     public @Nullable Cursor runQueryInBackground(Query query) {
     46         mQueryLatch.accept(query);
     47         Bundle extras = new Bundle();
     48         extras.putParcelable(URI_KEY, query.getUri());
     49         extras.putInt(URI_PAGE_ID, query.getId());
     50         MatrixCursor cursor = new MatrixCursor(new String[]{"id"}, 0);
     51         cursor.setExtras(extras);
     52         return cursor;
     53     }
     54 
     55     @Override
     56     public void onQueryFinished(Query query, Cursor cursor) {
     57         mReplyLatch.accept(new Pair<>(query.getId(), cursor));
     58     }
     59 
     60     public void reset(int expectedCount) throws InterruptedException {
     61         mQueryLatch = new CollectorLatch<>(expectedCount);
     62         mReplyLatch = new CollectorLatch<>(expectedCount);
     63     }
     64 
     65     public void waitFor(int seconds) throws InterruptedException {
     66         assertTrue(mQueryLatch.await(seconds, TimeUnit.SECONDS));
     67         assertTrue(mReplyLatch.await(seconds, TimeUnit.SECONDS));
     68     }
     69 
     70     public void assertQueried(final int expectedPageId) {
     71         mQueryLatch.assertHasItem(new Matcher<Query>() {
     72             @Override
     73             public boolean matches(Query query) {
     74                 return expectedPageId == query.getId();
     75             }
     76         });
     77     }
     78 
     79     public void assertReceivedContent(Uri expectedUri, final int expectedPageId) {
     80         mReplyLatch.assertHasItem(new Matcher<Pair<Integer, Cursor>>() {
     81             @Override
     82             public boolean matches(Pair<Integer, Cursor> value) {
     83                 return expectedPageId == value.first;
     84             }
     85         });
     86         List<Pair<Integer, Cursor>> collected = mReplyLatch.getCollected();
     87         Cursor cursor = null;
     88 
     89         for (Pair<Integer, Cursor> pair : collected) {
     90             if (expectedPageId == pair.first) {
     91                 cursor = pair.second;
     92             }
     93         }
     94 
     95         assertEquals(0, cursor.getCount());  // we don't add any records to our test cursor.
     96         Bundle extras = cursor.getExtras();
     97         assertNotNull(extras);
     98         assertTrue(extras.containsKey(URI_KEY));
     99         assertEquals(extras.getParcelable(URI_KEY), expectedUri);
    100         assertTrue(extras.containsKey(URI_PAGE_ID));
    101         assertEquals(extras.getInt(URI_PAGE_ID), expectedPageId);
    102     }
    103 
    104     private static final class CollectorLatch<T> extends CountDownLatch {
    105 
    106         private final List<T> mCollected = new ArrayList<>();
    107 
    108         CollectorLatch(int count) {
    109             super(count);
    110         }
    111 
    112         void accept(@Nullable T value) {
    113             onReceived(value);
    114             super.countDown();
    115         }
    116 
    117         @Override
    118         public void countDown() {
    119             throw new UnsupportedOperationException("Count is incremented by calls to accept.");
    120         }
    121 
    122         void onReceived(@Nullable T value) {
    123             mCollected.add(value);
    124         }
    125 
    126         List<T> getCollected() {
    127             return mCollected;
    128         }
    129 
    130         public void assertHasItem(Matcher<T> matcher) {
    131             T item = null;
    132             for (T val : mCollected) {
    133                 if (matcher.matches(val)) {
    134                     item = val;
    135                 }
    136             }
    137             assertNotNull(item);
    138         }
    139 
    140         public @Nullable T get(int index) {
    141             return mCollected.get(index);
    142         }
    143     }
    144 
    145     interface Matcher<T> {
    146         boolean matches(T value);
    147     }
    148 }
    149