1/*
2 * Copyright (C) 2011 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
18package android.filterfw.core;
19
20import java.util.Random;
21import java.util.Vector;
22
23import android.filterfw.core.Filter;
24import android.filterfw.core.Scheduler;
25
26/**
27 * @hide
28 */
29public class RandomScheduler extends Scheduler {
30
31    private Random mRand = new Random();
32
33    public RandomScheduler(FilterGraph graph) {
34        super(graph);
35    }
36
37    @Override
38    public void reset() {
39    }
40
41    @Override
42    public Filter scheduleNextNode() {
43        Vector<Filter> candidates = new Vector<Filter>();
44        for (Filter filter : getGraph().getFilters()) {
45            if (filter.canProcess())
46                candidates.add(filter);
47        }
48        if (candidates.size() > 0) {
49          int r = mRand.nextInt(candidates.size());
50          return candidates.elementAt(r);
51        }
52        return null;
53    }
54}
55