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 android.filterfw.core.Filter;
21import android.filterfw.core.Frame;
22import android.filterfw.core.FrameManager;
23import android.filterfw.core.GLEnvironment;
24
25import java.util.HashMap;
26import java.util.HashSet;
27import java.util.Set;
28
29/**
30 * @hide
31 */
32public class FilterContext {
33
34    private FrameManager mFrameManager;
35    private GLEnvironment mGLEnvironment;
36    private HashMap<String, Frame> mStoredFrames = new HashMap<String, Frame>();
37    private Set<FilterGraph> mGraphs = new HashSet<FilterGraph>();
38
39    public FrameManager getFrameManager() {
40        return mFrameManager;
41    }
42
43    public void setFrameManager(FrameManager manager) {
44        if (manager == null) {
45            throw new NullPointerException("Attempting to set null FrameManager!");
46        } else if (manager.getContext() != null) {
47            throw new IllegalArgumentException("Attempting to set FrameManager which is already "
48                + "bound to another FilterContext!");
49        } else {
50            mFrameManager = manager;
51            mFrameManager.setContext(this);
52        }
53    }
54
55    public GLEnvironment getGLEnvironment() {
56        return mGLEnvironment;
57    }
58
59    public void initGLEnvironment(GLEnvironment environment) {
60        if (mGLEnvironment == null) {
61            mGLEnvironment = environment;
62        } else {
63            throw new RuntimeException("Attempting to re-initialize GL Environment for " +
64                "FilterContext!");
65        }
66    }
67
68    public interface OnFrameReceivedListener {
69        public void onFrameReceived(Filter filter, Frame frame, Object userData);
70    }
71
72    public synchronized void storeFrame(String key, Frame frame) {
73        Frame storedFrame = fetchFrame(key);
74        if (storedFrame != null) {
75            storedFrame.release();
76        }
77        frame.onFrameStore();
78        mStoredFrames.put(key, frame.retain());
79    }
80
81    public synchronized Frame fetchFrame(String key) {
82        Frame frame = mStoredFrames.get(key);
83        if (frame != null) {
84            frame.onFrameFetch();
85        }
86        return frame;
87    }
88
89    public synchronized void removeFrame(String key) {
90        Frame frame = mStoredFrames.get(key);
91        if (frame != null) {
92            mStoredFrames.remove(key);
93            frame.release();
94        }
95    }
96
97    public synchronized void tearDown() {
98        // Release stored frames
99        for (Frame frame : mStoredFrames.values()) {
100            frame.release();
101        }
102        mStoredFrames.clear();
103
104        // Release graphs
105        for (FilterGraph graph : mGraphs) {
106            graph.tearDown(this);
107        }
108        mGraphs.clear();
109
110        // Release frame manager
111        if (mFrameManager != null) {
112            mFrameManager.tearDown();
113            mFrameManager = null;
114        }
115
116        // Release GL context
117        if (mGLEnvironment != null) {
118            mGLEnvironment.tearDown();
119            mGLEnvironment = null;
120        }
121    }
122
123    final void addGraph(FilterGraph graph) {
124        mGraphs.add(graph);
125    }
126}
127