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/*
* 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.filterpacks.base;
import java.util.Set;
import android.filterfw.core.Filter;
import android.filterfw.core.FilterContext;
import android.filterfw.core.Frame;
import android.filterfw.core.FrameFormat;
import android.filterfw.core.GenerateFieldPort;
import android.filterfw.core.GenerateFinalPort;
import android.filterfw.core.MutableFrameFormat;
import android.filterfw.format.ObjectFormat;
/**
* @hide
*/
public class ObjectSource extends Filter {
@GenerateFieldPort(name = "object")
private Object mObject;
@GenerateFinalPort(name = "format", hasDefault = true)
private FrameFormat mOutputFormat = FrameFormat.unspecified();
@GenerateFieldPort(name = "repeatFrame", hasDefault = true)
boolean mRepeatFrame = false;
private Frame mFrame;
public ObjectSource(String name) {
super(name);
}
@Override
public void setupPorts() {
addOutputPort("frame", mOutputFormat);
}
@Override
public void process(FilterContext context) {
// If no frame has been created, create one now.
if (mFrame == null) {
if (mObject == null) {
throw new NullPointerException("ObjectSource producing frame with no object set!");
}
FrameFormat outputFormat = ObjectFormat.fromObject(mObject, FrameFormat.TARGET_SIMPLE);
mFrame = context.getFrameManager().newFrame(outputFormat);
mFrame.setObjectValue(mObject);
mFrame.setTimestamp(Frame.TIMESTAMP_UNKNOWN);
}
// Push output
pushOutput("frame", mFrame);
// Wait for free output
if (!mRepeatFrame) {
closeOutputPort("frame");
}
}
@Override
public void tearDown(FilterContext context) {
mFrame.release();
}
@Override
public void fieldPortValueUpdated(String name, FilterContext context) {
// Release our internal frame, so that it is regenerated on the next call to process().
if (name.equals("object")) {
if (mFrame != null) {
mFrame.release();
mFrame = null;
}
}
}
}
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