/**
* Copyright 2011 Adrian Stabiszewski, as@nfctools.org
*
* 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 org.nfctools.ndef.wkt.handover.decoder;
import org.nfctools.ndef.NdefConstants;
import org.nfctools.ndef.NdefMessageDecoder;
import org.nfctools.ndef.Record;
import org.nfctools.ndef.ext.UnsupportedExternalTypeRecord;
import org.nfctools.ndef.wkt.WellKnownRecordPayloadDecoder;
import org.nfctools.ndef.wkt.handover.records.HandoverCarrierRecord;
import org.nfctools.ndef.wkt.handover.records.HandoverCarrierRecord.CarrierTypeFormat;
import org.nfctools.ndef.wkt.records.WellKnownRecord;
/**
*
* @author Thomas Rorvik Skjolberg (skjolber@gmail.com)
*
*/
public class HandoverCarrierRecordDecoder implements WellKnownRecordPayloadDecoder {
@Override
public WellKnownRecord decodePayload(byte[] payload, NdefMessageDecoder messageDecoder) {
HandoverCarrierRecord handoverCarrierRecord = new HandoverCarrierRecord();
CarrierTypeFormat carrierTypeFormat = CarrierTypeFormat.toCarrierTypeFormat((byte)(payload[0] & 0x7));
handoverCarrierRecord.setCarrierTypeFormat(carrierTypeFormat);
int carrierTypeLength = (int)(payload[1] & 0xFF);
byte[] carrierType = new byte[carrierTypeLength];
System.arraycopy(payload, 2, carrierType, 0, carrierTypeLength);
switch (carrierTypeFormat) {
case WellKnown: {
// NFC Forum well-known type [NFC RTD]
Record record = messageDecoder.decodeToRecord(carrierType);
if (record instanceof WellKnownRecord) {
handoverCarrierRecord.setCarrierType(record);
}
else {
throw new IllegalArgumentException("Expected well-known type carrier type");
}
break;
}
case Media: {
// Media-type as defined in RFC 2046 [RFC 2046]
handoverCarrierRecord.setCarrierType(new String(carrierType, NdefConstants.DEFAULT_CHARSET));
break;
}
case AbsoluteURI: {
// Absolute URI as defined in RFC 3986 [RFC 3986]
handoverCarrierRecord.setCarrierType(new String(carrierType, NdefConstants.DEFAULT_CHARSET));
break;
}
case External: {
// NFC Forum external type [NFC RTD]
Record record = messageDecoder.decodeToRecord(carrierType);
if (record instanceof UnsupportedExternalTypeRecord) {
handoverCarrierRecord.setCarrierType(record);
}
else {
throw new IllegalArgumentException("Expected external type carrier type");
}
}
default: {
throw new RuntimeException();
}
}
// The number of CARRIER_DATA octets is equal to the NDEF record PAYLOAD_LENGTH minus the CARRIER_TYPE_LENGTH minus 2.
int carrierDataLength = payload.length - 2 - carrierTypeLength;
byte[] carrierData;
if (carrierDataLength > 0) {
carrierData = new byte[carrierDataLength];
System.arraycopy(payload, 2 + carrierTypeLength, carrierData, 0, carrierDataLength);
}
else {
carrierData = NdefConstants.EMPTY_BYTE_ARRAY;
}
handoverCarrierRecord.setCarrierData(carrierData);
return handoverCarrierRecord;
}
}