content: /*
   * Copyright (C) 2012 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.nfc.tech;
  
  import android.nfc.Tag;
  import android.os.Bundle;
  import android.os.RemoteException;
  
  /**
   * Provides access to tags containing just a barcode.
   *
   * <p>Acquire an {@link NfcBarcode} object using {@link #get}.
   *
   */
  public final class NfcBarcode extends BasicTagTechnology {
  
      /** Kovio Tags */
      public static final int TYPE_KOVIO = 1;
      public static final int TYPE_UNKNOWN = -1;
  
      /** @hide */
      public static final String EXTRA_BARCODE_TYPE = "barcodetype";
  
      private int mType;
  
      /**
       * Get an instance of {@link NfcBarcode} for the given tag.
       *
       * <p>Returns null if {@link NfcBarcode} was not enumerated in {@link Tag#getTechList}.
       *
       * <p>Does not cause any RF activity and does not block.
       *
       * @param tag an NfcBarcode compatible tag
       * @return NfcBarcode object
       */
      public static NfcBarcode get(Tag tag) {
          if (!tag.hasTech(TagTechnology.NFC_BARCODE)) return null;
          try {
              return new NfcBarcode(tag);
          } catch (RemoteException e) {
              return null;
          }
      }
  
      /**
       * Internal constructor, to be used by NfcAdapter
       * @hide
       */
      public NfcBarcode(Tag tag) throws RemoteException {
          super(tag, TagTechnology.NFC_BARCODE);
          Bundle extras = tag.getTechExtras(TagTechnology.NFC_BARCODE);
          if (extras != null) {
              mType = extras.getInt(EXTRA_BARCODE_TYPE);
          } else {
              throw new NullPointerException("NfcBarcode tech extras are null.");
          }
      }
  
      /**
       * Returns the NFC Barcode tag type.
       *
       * <p>Currently only one of {@link #TYPE_KOVIO} or {@link #TYPE_UNKNOWN}.
       *
       * <p>Does not cause any RF activity and does not block.
       *
       * @return the NFC Barcode tag type
       */
      public int getType() {
          return mType;
      }
  
      /**
       * Returns the barcode of an NfcBarcode tag.
       *
       * <p> Tags of {@link #TYPE_KOVIO} return 16 bytes:
       *     <ul>
       *     <p> The first byte is 0x80 ORd with a manufacturer ID, corresponding
       *       to ISO/IEC 7816-6.
       *     <p> The second byte describes the payload data format. Defined data
       *       format types include the following:<ul>
       *       <li>0x00: Reserved for manufacturer assignment</li>
       *       <li>0x01: 96-bit URL with "http://www." prefix</li>
       *       <li>0x02: 96-bit URL with "https://www." prefix</li>
       *       <li>0x03: 96-bit URL with "http://" prefix</li>
       *       <li>0x04: 96-bit URL with "https://" prefix</li>
       *       <li>0x05: 96-bit GS1 EPC</li>
       *       <li>0x06-0xFF: reserved</li>
       *       </ul>
       *     <p>The following 12 bytes are payload:<ul>
       *       <li> In case of a URL payload, the payload is encoded in US-ASCII,
       *            following the limitations defined in RFC3987.
       *            {@see <a href="http://www.ietf.org/rfc/rfc3987.txt">RFC 3987</a>}</li>
       *       <li> In case of GS1 EPC data, see <a href="http://www.gs1.org/gsmp/kc/epcglobal/tds/">
       *            GS1 Electronic Product Code (EPC) Tag Data Standard (TDS)</a> for more details.
       *       </li>
       *     </ul>
       *     <p>The last 2 bytes comprise the CRC.
       *     </ul>
       * <p>Does not cause any RF activity and does not block.
       *
       * @return a byte array containing the barcode
       * @see <a href="http://www.thinfilm.no/docs/thinfilm-nfc-barcode-datasheet.pdf">
       *      Thinfilm NFC Barcode tag specification (previously Kovio NFC Barcode)</a>
       * @see <a href="http://www.thinfilm.no/docs/thinfilm-nfc-barcode-data-format.pdf">
       *      Thinfilm NFC Barcode data format (previously Kovio NFC Barcode)</a>
       */
      public byte[] getBarcode() {
          switch (mType) {
              case TYPE_KOVIO:
                  // For Kovio tags the barcode matches the ID
                  return mTag.getId();
              default:
                  return null;
          }
      }
  }
  