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.io;
19
20import android.content.Context;
21import android.filterfw.core.FilterGraph;
22import android.filterfw.core.KeyValueMap;
23import android.filterfw.io.GraphIOException;
24
25import java.io.InputStream;
26import java.io.InputStreamReader;
27import java.io.IOException;
28import java.io.StringWriter;
29
30/**
31 * @hide
32 */
33public abstract class GraphReader {
34
35    protected KeyValueMap mReferences = new KeyValueMap();
36
37    public abstract FilterGraph readGraphString(String graphString) throws GraphIOException;
38
39    public abstract KeyValueMap readKeyValueAssignments(String assignments) throws GraphIOException;
40
41    public FilterGraph readGraphResource(Context context, int resourceId) throws GraphIOException {
42        InputStream inputStream = context.getResources().openRawResource(resourceId);
43        InputStreamReader reader = new InputStreamReader(inputStream);
44        StringWriter writer = new StringWriter();
45        char[] buffer = new char[1024];
46        try {
47            int bytesRead;
48            while ((bytesRead = reader.read(buffer, 0, 1024)) > 0) {
49                writer.write(buffer, 0, bytesRead);
50            }
51        } catch (IOException e) {
52            throw new RuntimeException("Could not read specified resource file!");
53        }
54        return readGraphString(writer.toString());
55    }
56
57    public void addReference(String name, Object object) {
58        mReferences.put(name, object);
59    }
60
61    public void addReferencesByMap(KeyValueMap refs) {
62        mReferences.putAll(refs);
63    }
64
65    public void addReferencesByKeysAndValues(Object... references) {
66        mReferences.setKeyValues(references);
67    }
68
69}
70