content: /*
   * Copyright (C) 2013 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.printservice;
  
  import android.annotation.NonNull;
  import android.annotation.Nullable;
  import android.os.ParcelFileDescriptor;
  import android.os.RemoteException;
  import android.print.PrintDocumentInfo;
  import android.print.PrintJobId;
  import android.util.Log;
  
  import java.io.IOException;
  
  /**
   * This class represents a printed document from the perspective of a print
   * service. It exposes APIs to query the document and obtain its data.
   * <p>
   * <strong>Note: </strong> All methods of this class must be executed on the
   * main application thread.
   * </p>
   */
  public final class PrintDocument {
  
      private static final String LOG_TAG = "PrintDocument";
  
      private final PrintJobId mPrintJobId;
  
      private final IPrintServiceClient mPrintServiceClient;
  
      private final PrintDocumentInfo mInfo;
  
      PrintDocument(PrintJobId printJobId, IPrintServiceClient printServiceClient,
              PrintDocumentInfo info) {
          mPrintJobId = printJobId;
          mPrintServiceClient = printServiceClient;
          mInfo = info;
      }
  
      /**
       * Gets the {@link PrintDocumentInfo} that describes this document.
       *
       * @return The document info.
       */
      public @NonNull PrintDocumentInfo getInfo() {
          PrintService.throwIfNotCalledOnMainThread();
          return mInfo;
      }
  
      /**
       * Gets the data associated with this document.
       * <p>
       * <strong>Note: </strong> It is a responsibility of the client to open a
       * stream to the returned file descriptor, fully read the data, and close
       * the file descriptor.
       * </p>
       *
       * @return A file descriptor for reading the data.
       */
      public @Nullable ParcelFileDescriptor getData() {
          PrintService.throwIfNotCalledOnMainThread();
          ParcelFileDescriptor source = null;
          ParcelFileDescriptor sink = null;
          try {
              ParcelFileDescriptor[] fds = ParcelFileDescriptor.createPipe();
              source = fds[0];
              sink = fds[1];
              mPrintServiceClient.writePrintJobData(sink, mPrintJobId);
              return source;
          } catch (IOException ioe) {
              Log.e(LOG_TAG, "Error calling getting print job data!", ioe);
          } catch (RemoteException re) {
              Log.e(LOG_TAG, "Error calling getting print job data!", re);
          } finally {
              if (sink != null) {
                  try {
                      sink.close();
                  } catch (IOException ioe) {
                      /* ignore */
                  }
              }
          }
          return null;
      }
  }
  