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 class OutputPort extends FilterPort {
  
      protected InputPort mTargetPort;
      protected InputPort mBasePort;
  
      public OutputPort(Filter filter, String name) {
          super(filter, name);
      }
  
      public void connectTo(InputPort target) {
          if (mTargetPort != null) {
              throw new RuntimeException(this + " already connected to " + mTargetPort + "!");
          }
          mTargetPort = target;
          mTargetPort.setSourcePort(this);
      }
  
      public boolean isConnected() {
          return mTargetPort != null;
      }
  
      public void open() {
          super.open();
          if (mTargetPort != null && !mTargetPort.isOpen()) {
              mTargetPort.open();
          }
      }
  
      public void close() {
          super.close();
          if (mTargetPort != null && mTargetPort.isOpen()) {
              mTargetPort.close();
          }
      }
  
      public InputPort getTargetPort() {
          return mTargetPort;
      }
  
      public Filter getTargetFilter() {
          return mTargetPort == null ? null : mTargetPort.getFilter();
      }
  
      public void setBasePort(InputPort basePort) {
          mBasePort = basePort;
      }
  
      public InputPort getBasePort() {
          return mBasePort;
      }
  
      public boolean filterMustClose() {
          return !isOpen() && isBlocking();
      }
  
      public boolean isReady() {
          return (isOpen() && mTargetPort.acceptsFrame()) || !isBlocking();
      }
  
      @Override
      public void clear() {
          if (mTargetPort != null) {
              mTargetPort.clear();
          }
      }
  
      @Override
      public void pushFrame(Frame frame) {
          if (mTargetPort == null) {
              throw new RuntimeException(
                  "Attempting to push frame on unconnected port: " + this + "!");
          }
          mTargetPort.pushFrame(frame);
      }
  
      @Override
      public void setFrame(Frame frame) {
          assertPortIsOpen();
          if (mTargetPort == null) {
              throw new RuntimeException(
                  "Attempting to set frame on unconnected port: " + this + "!");
          }
          mTargetPort.setFrame(frame);
      }
  
      @Override
      public Frame pullFrame() {
          throw new RuntimeException("Cannot pull frame on " + this + "!");
      }
  
      @Override
      public boolean hasFrame() {
          return mTargetPort == null ? false : mTargetPort.hasFrame();
      }
  
      @Override
      public String toString() {
          return "output " + super.toString();
      }
  }
  