1/*
2 * Copyright (C) 2010 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 com.replica.replicaisland;
18
19import java.util.Comparator;
20
21public class ChannelSystem extends BaseObject {
22    private static final int CHANNEL_COUNT = 8;
23    private static final ChannelComparator sChannelComparator = new ChannelComparator();
24    private FixedSizeArray<Channel> mChannels;
25    private Channel mSearchDummy;
26    private int mRegisteredChannelCount;
27
28    public ChannelSystem() {
29        super();
30        mChannels = new FixedSizeArray<Channel>(CHANNEL_COUNT);
31        mChannels.setComparator(sChannelComparator);
32        mSearchDummy = new Channel();
33
34        for (int x = 0; x < CHANNEL_COUNT; x++) {
35            mChannels.add(new Channel());
36        }
37
38        mRegisteredChannelCount = 0;
39    }
40
41    @Override
42    public void reset() {
43        for (int x = 0; x < CHANNEL_COUNT; x++) {
44            mChannels.get(x).name = null;
45            mChannels.get(x).value = null;
46        }
47
48        mRegisteredChannelCount = 0;
49    }
50
51    public Channel registerChannel(String name) {
52        Channel result = null;
53        mSearchDummy.name = name;
54        final int index = mChannels.find(mSearchDummy, false);
55        if (index == -1) {
56            // Add a new channel.
57            assert mRegisteredChannelCount < CHANNEL_COUNT : "Channel pool exhausted!";
58
59            if (mRegisteredChannelCount < CHANNEL_COUNT) {
60                result = mChannels.get(mRegisteredChannelCount);
61                mRegisteredChannelCount++;
62                result.name = name;
63                mChannels.sort(true);
64            }
65        } else {
66            result = mChannels.get(index);
67        }
68
69        return result;
70    }
71
72    public class Channel {
73        public String name;
74        public Object value;
75    }
76
77    public static class ChannelFloatValue {
78        public float value;
79    }
80
81    public static class ChannelBooleanValue {
82    	public boolean value;
83    }
84
85    /** Comparator for channels. */
86    private final static class ChannelComparator implements Comparator<Channel> {
87        public int compare(final Channel object1, final Channel object2) {
88            int result = 0;
89            if (object1 == null && object2 != null) {
90                result = 1;
91            } else if (object1 != null && object2 == null) {
92                result = -1;
93            } else if (object1 != null && object2 != null) {
94                if (object1.name == null && object2.name != null) {
95                    result = 1;
96                } else if (object1.name != null && object2.name == null) {
97                    result = -1;
98                } else if (object1.name != null && object2.name != null) {
99                    result = object1.name.compareTo(object2.name);
100                }
101            }
102            return result;
103        }
104    }
105
106}
107