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.filterfw.core;
  
  import android.annotation.UnsupportedAppUsage;
  import android.filterfw.core.Filter;
  import android.filterfw.core.Frame;
  import android.filterfw.core.FrameManager;
  import android.filterfw.core.GLEnvironment;
  
  import java.util.HashMap;
  import java.util.HashSet;
  import java.util.Set;
  
  /**
   * @hide
   */
  public class FilterContext {
  
      private FrameManager mFrameManager;
      private GLEnvironment mGLEnvironment;
      private HashMap<String, Frame> mStoredFrames = new HashMap<String, Frame>();
      private Set<FilterGraph> mGraphs = new HashSet<FilterGraph>();
  
      @UnsupportedAppUsage
      public FrameManager getFrameManager() {
          return mFrameManager;
      }
  
      public void setFrameManager(FrameManager manager) {
          if (manager == null) {
              throw new NullPointerException("Attempting to set null FrameManager!");
          } else if (manager.getContext() != null) {
              throw new IllegalArgumentException("Attempting to set FrameManager which is already "
                  + "bound to another FilterContext!");
          } else {
              mFrameManager = manager;
              mFrameManager.setContext(this);
          }
      }
  
      @UnsupportedAppUsage
      public GLEnvironment getGLEnvironment() {
          return mGLEnvironment;
      }
  
      public void initGLEnvironment(GLEnvironment environment) {
          if (mGLEnvironment == null) {
              mGLEnvironment = environment;
          } else {
              throw new RuntimeException("Attempting to re-initialize GL Environment for " +
                  "FilterContext!");
          }
      }
  
      public interface OnFrameReceivedListener {
          public void onFrameReceived(Filter filter, Frame frame, Object userData);
      }
  
      public synchronized void storeFrame(String key, Frame frame) {
          Frame storedFrame = fetchFrame(key);
          if (storedFrame != null) {
              storedFrame.release();
          }
          frame.onFrameStore();
          mStoredFrames.put(key, frame.retain());
      }
  
      public synchronized Frame fetchFrame(String key) {
          Frame frame = mStoredFrames.get(key);
          if (frame != null) {
              frame.onFrameFetch();
          }
          return frame;
      }
  
      public synchronized void removeFrame(String key) {
          Frame frame = mStoredFrames.get(key);
          if (frame != null) {
              mStoredFrames.remove(key);
              frame.release();
          }
      }
  
      public synchronized void tearDown() {
          // Release stored frames
          for (Frame frame : mStoredFrames.values()) {
              frame.release();
          }
          mStoredFrames.clear();
  
          // Release graphs
          for (FilterGraph graph : mGraphs) {
              graph.tearDown(this);
          }
          mGraphs.clear();
  
          // Release frame manager
          if (mFrameManager != null) {
              mFrameManager.tearDown();
              mFrameManager = null;
          }
  
          // Release GL context
          if (mGLEnvironment != null) {
              mGLEnvironment.tearDown();
              mGLEnvironment = null;
          }
      }
  
      final void addGraph(FilterGraph graph) {
          mGraphs.add(graph);
      }
  }
  