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
20/**
21 * @hide
22 */
23public abstract class InputPort extends FilterPort {
24
25    protected OutputPort mSourcePort;
26
27    public InputPort(Filter filter, String name) {
28        super(filter, name);
29    }
30
31    public void setSourcePort(OutputPort source) {
32        if (mSourcePort != null) {
33            throw new RuntimeException(this + " already connected to " + mSourcePort + "!");
34        }
35        mSourcePort = source;
36    }
37
38    public boolean isConnected() {
39        return mSourcePort != null;
40    }
41
42    public void open() {
43        super.open();
44        if (mSourcePort != null && !mSourcePort.isOpen()) {
45            mSourcePort.open();
46        }
47    }
48
49    public void close() {
50        if (mSourcePort != null && mSourcePort.isOpen()) {
51            mSourcePort.close();
52        }
53        super.close();
54    }
55
56    public OutputPort getSourcePort() {
57        return mSourcePort;
58    }
59
60    public Filter getSourceFilter() {
61        return mSourcePort == null ? null : mSourcePort.getFilter();
62    }
63
64    public FrameFormat getSourceFormat() {
65        return mSourcePort != null ? mSourcePort.getPortFormat() : getPortFormat();
66    }
67
68    public Object getTarget() {
69        return null;
70    }
71
72    public boolean filterMustClose() {
73        return !isOpen() && isBlocking() && !hasFrame();
74    }
75
76    public boolean isReady() {
77        return hasFrame() || !isBlocking();
78    }
79
80    public boolean acceptsFrame() {
81        return !hasFrame();
82    }
83
84    public abstract void transfer(FilterContext context);
85}
86