| /* |
| * Copyright (C) 2011 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| |
| package android.filterfw.core; |
| |
| /** |
| * @hide |
| */ |
| public class StreamPort extends InputPort { |
| |
| private Frame mFrame; |
| private boolean mPersistent; |
| |
| public StreamPort(Filter filter, String name) { |
| super(filter, name); |
| } |
| |
| @Override |
| public void clear() { |
| if (mFrame != null) { |
| mFrame.release(); |
| mFrame = null; |
| } |
| } |
| |
| @Override |
| public void setFrame(Frame frame) { |
| assignFrame(frame, true); |
| } |
| |
| @Override |
| public void pushFrame(Frame frame) { |
| assignFrame(frame, false); |
| } |
| |
| protected synchronized void assignFrame(Frame frame, boolean persistent) { |
| assertPortIsOpen(); |
| checkFrameType(frame, persistent); |
| |
| if (persistent) { |
| if (mFrame != null) { |
| mFrame.release(); |
| } |
| } else if (mFrame != null) { |
| throw new RuntimeException( |
| "Attempting to push more than one frame on port: " + this + "!"); |
| } |
| mFrame = frame.retain(); |
| mFrame.markReadOnly(); |
| mPersistent = persistent; |
| } |
| |
| @Override |
| public synchronized Frame pullFrame() { |
| // Make sure we have a frame |
| if (mFrame == null) { |
| throw new RuntimeException("No frame available to pull on port: " + this + "!"); |
| } |
| |
| // Return a retained result |
| Frame result = mFrame; |
| if (mPersistent) { |
| mFrame.retain(); |
| } else { |
| mFrame = null; |
| } |
| return result; |
| } |
| |
| @Override |
| public synchronized boolean hasFrame() { |
| return mFrame != null; |
| } |
| |
| @Override |
| public String toString() { |
| return "input " + super.toString(); |
| } |
| |
| @Override |
| public synchronized void transfer(FilterContext context) { |
| if (mFrame != null) { |
| checkFrameManager(mFrame, context); |
| } |
| } |
| } |