com.iab.gpp.encoder.bitstring.BitStringEncoder Maven / Gradle / Ivy

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package com.iab.gpp.encoder.bitstring;

import java.util.List;
import com.iab.gpp.encoder.datatype.AbstractEncodableBitStringDataType;
import com.iab.gpp.encoder.datatype.SubstringException;
import com.iab.gpp.encoder.error.DecodingException;
import com.iab.gpp.encoder.error.EncodingException;
import com.iab.gpp.encoder.field.EncodableBitStringFields;

public class BitStringEncoder {

  private static BitStringEncoder instance = new BitStringEncoder();
  
  private BitStringEncoder() {
    
  }
  
  public static BitStringEncoder getInstance() {
    return instance;
  }
  
  public String encode(EncodableBitStringFields fields, List fieldNames) {
    String bitString = "";
    for (int i = 0; i < fieldNames.size(); i++) {
      String fieldName = fieldNames.get(i);
      if (fields.containsKey(fieldName)) {
        AbstractEncodableBitStringDataType field = fields.get(fieldName);
        bitString += field.encode();
      } else {
        throw new EncodingException("Field not found: '" + fieldName + "'");
      }
    }

    return bitString;
  }

  public void decode(String bitString, List fieldNames, EncodableBitStringFields fields) {
    int index = 0;
    for (int i = 0; i < fieldNames.size(); i++) {
      String fieldName = fieldNames.get(i);
      if (fields.containsKey(fieldName)) {
        AbstractEncodableBitStringDataType field = fields.get(fieldName);
        try {
          String substring = field.substring(bitString, index);
          field.decode(substring);
          index += substring.length();
        } catch (SubstringException e) {
          if(field.getHardFailIfMissing()) {
            throw new DecodingException("Unable to decode " + fieldName, e);
          } else {
            return;
          }
        } catch (Exception e) {
          throw new DecodingException("Unable to decode " + fieldName, e);
        }
      } else {
        throw new DecodingException("Field not found: '" + fieldName + "'");
      }
    }
  }
}