core/java/android/nfc/technology/NdefFormatable.java

/*
 * Copyright (C) 2010 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.technology;

import android.nfc.ErrorCodes;
import android.nfc.FormatException;
import android.nfc.NdefMessage;
import android.nfc.NfcAdapter;
import android.nfc.Tag;
import android.os.Bundle;
import android.os.RemoteException;

import java.io.IOException;

/**
 * An interface to a {@link Tag} allowing to format the tag as NDEF.
 *
 * <p>You can acquire this kind of interface with {@link Tag#getTechnology(int)}.
 *
 * <p class="note"><strong>Note:</strong>
 * Use of this class requires the {@link android.Manifest.permission#NFC}
 * permission.
 */
public final class NdefFormatable extends BasicTagTechnology {
    /**
     * Internal constructor, to be used by NfcAdapter
     * @hide
     */
    public NdefFormatable(NfcAdapter adapter, Tag tag, int tech, Bundle extras) throws RemoteException {
        super(adapter, tag, tech);
    }

    /**
     * Returns whether a tag can be formatted with {@link
     * NdefFormatable#format(NdefMessage)}
     */
    public boolean canBeFormatted() throws IOException {
      throw new UnsupportedOperationException();
    }

    /**
     * Formats a tag as NDEF, if possible. You may supply a first
     * NdefMessage to be written on the tag.
     */
    public void format(NdefMessage firstMessage) throws IOException, FormatException {
        try {
            byte[] DEFAULT_KEY = {(byte)0xFF,(byte)0xFF,(byte)0xFF,
                                  (byte)0xFF,(byte)0xFF,(byte)0xFF};
            int serviceHandle = mTag.getServiceHandle();
            int errorCode = mTagService.formatNdef(serviceHandle, DEFAULT_KEY);
            switch (errorCode) {
                case ErrorCodes.SUCCESS:
                    break;
                case ErrorCodes.ERROR_IO:
                    throw new IOException();
                case ErrorCodes.ERROR_INVALID_PARAM:
                    throw new FormatException();
                default:
                    // Should not happen
                    throw new IOException();
            }
            // Now check and see if the format worked
            if (mTagService.isNdef(serviceHandle)) {
                errorCode = mTagService.ndefWrite(serviceHandle, firstMessage);
                switch (errorCode) {
                    case ErrorCodes.SUCCESS:
                        break;
                    case ErrorCodes.ERROR_IO:
                        throw new IOException();
                    case ErrorCodes.ERROR_INVALID_PARAM:
                        throw new FormatException();
                    default:
                        // Should not happen
                        throw new IOException();
                }
            } else {
                throw new IOException();
            }
        } catch (RemoteException e) {
            attemptDeadServiceRecovery(e);
        }
    }

    @Override
    public byte[] transceive(byte[] data) {
        throw new UnsupportedOperationException();
    }
}