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.core.MutableFrameFormat;
  import android.filterfw.format.PrimitiveFormat;
  
  import java.io.ByteArrayOutputStream;
  import java.io.InputStream;
  import java.io.IOException;
  import java.nio.ByteBuffer;
  
  /**
   * @hide
   */
  public class InputStreamSource extends Filter {
  
      @GenerateFinalPort(name = "target")
      private String mTarget;
  
      @GenerateFieldPort(name = "stream")
      private InputStream mInputStream;
  
      @GenerateFinalPort(name = "format", hasDefault = true)
      private MutableFrameFormat mOutputFormat = null;
  
      public InputStreamSource(String name) {
          super(name);
      }
  
      @Override
      public void setupPorts() {
          int target = FrameFormat.readTargetString(mTarget);
          if (mOutputFormat == null) {
              mOutputFormat = PrimitiveFormat.createByteFormat(target);
          }
          addOutputPort("data", mOutputFormat);
      }
  
      @Override
      public void process(FilterContext context) {
          int fileSize = 0;
          ByteBuffer byteBuffer = null;
  
          // Read the file
          try {
              ByteArrayOutputStream byteStream = new ByteArrayOutputStream();
              byte[] buffer = new byte[1024];
              int bytesRead;
              while ((bytesRead = mInputStream.read(buffer)) > 0) {
                  byteStream.write(buffer, 0, bytesRead);
                  fileSize += bytesRead;
              }
              byteBuffer = ByteBuffer.wrap(byteStream.toByteArray());
          } catch (IOException exception) {
              throw new RuntimeException(
                  "InputStreamSource: Could not read stream: " + exception.getMessage() + "!");
          }
  
          // Put it into a frame
          mOutputFormat.setDimensions(fileSize);
          Frame output = context.getFrameManager().newFrame(mOutputFormat);
          output.setData(byteBuffer);
  
          // Push output
          pushOutput("data", output);
  
          // Release pushed frame
          output.release();
  
          // Close output port as we are done here
          closeOutputPort("data");
      }
  }
  