content: /*
   * 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 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.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;
              }
          }
      }
  }
  