1/*
2 * Copyright (C) 2012 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
17package android.bordeaux.services;
18
19import android.bordeaux.services.IPredictor;
20import android.content.Context;
21import android.os.RemoteException;
22import android.util.Log;
23
24import java.util.ArrayList;
25import java.util.List;
26import java.util.HashMap;
27import java.util.Map;
28
29/** Predictor for the Learning framework.
30 */
31public class BordeauxPredictor {
32    static final String TAG = "BordeauxPredictor";
33    static final String PREDICTOR_NOTAVAILABLE = "Predictor is not available.";
34    private Context mContext;
35    private String mName;
36    private IPredictor mPredictor;
37
38    public boolean retrievePredictor() {
39        if (mPredictor == null)
40            mPredictor = BordeauxManagerService.getPredictor(mContext, mName);
41        if (mPredictor == null) {
42            Log.e(TAG, PREDICTOR_NOTAVAILABLE);
43            return false;
44        }
45        return true;
46    }
47
48    public BordeauxPredictor(Context context) {
49        mContext = context;
50        mName = "defaultPredictor";
51        mPredictor = BordeauxManagerService.getPredictor(context, mName);
52    }
53
54    public BordeauxPredictor(Context context, String name) {
55        mContext = context;
56        mName = name;
57        mPredictor = BordeauxManagerService.getPredictor(context, mName);
58    }
59
60    public boolean reset() {
61        if (!retrievePredictor()){
62            Log.e(TAG, PREDICTOR_NOTAVAILABLE);
63            return false;
64        }
65        try {
66            mPredictor.ResetPredictor();
67            return true;
68        } catch (RemoteException e) {
69        }
70        return false;
71    }
72
73    public void pushSample(String s) {
74        if (!retrievePredictor())
75            throw new RuntimeException(PREDICTOR_NOTAVAILABLE);
76        try {
77            mPredictor.pushNewSample(s);
78        } catch (RemoteException e) {
79            Log.e(TAG,"Exception: pushing a new example");
80            throw new RuntimeException(PREDICTOR_NOTAVAILABLE);
81        }
82    }
83
84    public float getProbability(String s) {
85        if (!retrievePredictor())
86            throw new RuntimeException(PREDICTOR_NOTAVAILABLE);
87        try {
88            return mPredictor.getSampleProbability(s);
89        } catch (RemoteException e) {
90            Log.e(TAG,"Exception: getting sample probability");
91            throw new RuntimeException(PREDICTOR_NOTAVAILABLE);
92        }
93    }
94
95    public boolean setParameter(String key, String value) {
96        if (!retrievePredictor())
97            throw new RuntimeException(PREDICTOR_NOTAVAILABLE);
98        try {
99            return mPredictor.setPredictorParameter(key, value);
100        } catch (RemoteException e) {
101            Log.e(TAG,"Exception: setting predictor parameter");
102            throw new RuntimeException(PREDICTOR_NOTAVAILABLE);
103        }
104    }
105}
106