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;
  
  /**
   * @hide
   */
  public abstract class InputPort extends FilterPort {
  
      protected OutputPort mSourcePort;
  
      public InputPort(Filter filter, String name) {
          super(filter, name);
      }
  
      public void setSourcePort(OutputPort source) {
          if (mSourcePort != null) {
              throw new RuntimeException(this + " already connected to " + mSourcePort + "!");
          }
          mSourcePort = source;
      }
  
      public boolean isConnected() {
          return mSourcePort != null;
      }
  
      public void open() {
          super.open();
          if (mSourcePort != null && !mSourcePort.isOpen()) {
              mSourcePort.open();
          }
      }
  
      public void close() {
          if (mSourcePort != null && mSourcePort.isOpen()) {
              mSourcePort.close();
          }
          super.close();
      }
  
      public OutputPort getSourcePort() {
          return mSourcePort;
      }
  
      public Filter getSourceFilter() {
          return mSourcePort == null ? null : mSourcePort.getFilter();
      }
  
      public FrameFormat getSourceFormat() {
          return mSourcePort != null ? mSourcePort.getPortFormat() : getPortFormat();
      }
  
      public Object getTarget() {
          return null;
      }
  
      public boolean filterMustClose() {
          return !isOpen() && isBlocking() && !hasFrame();
      }
  
      public boolean isReady() {
          return hasFrame() || !isBlocking();
      }
  
      public boolean acceptsFrame() {
          return !hasFrame();
      }
  
      public abstract void transfer(FilterContext context);
  }
  