org.beangle.commons.dbf.Field.scala Maven / Gradle / Ivy

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/*
 * Copyright (C) 2005, The Beangle Software.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published
 * by the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program.  If not, see .
 */

package org.beangle.commons.dbf

import java.io.{DataInput, IOException}

class Field(
             val index: Int,
             val name: String,
             val dataType: DataType,
             val fieldLength: Int,
             val decimalCount: Byte,
             val workAreaId: Byte,
             val setFieldsFlag: Byte,
             val indexFieldFlag: Byte) {
}

object Field {
  val HEADER_TERMINATOR = 0x0d;

  def read(in: DataInput, index: Int): Field =
    try {
      //|fileName{0-10}|data-type{11}|reserved{12-15}|field-ength{16}|decimal-count{17}
      //|reserved{18-19}|work-areaid{20}|reserved{21-22}|setFieldsFlag{23}|reserved{24-30}
      //|indexFieldFlag{31}

      // we get end of the dbf header
      val firstByte = in.readByte()
      if (firstByte == HEADER_TERMINATOR) return null;

      val nameBuf = new Array[Byte](11)
      in.readFully(nameBuf, 1, 10)
      nameBuf(0) = firstByte

      var nonZeroIndex = nameBuf.length - 1
      while (nonZeroIndex >= 0 && nameBuf(nonZeroIndex) == 0) nonZeroIndex -= 1

      val name = new String(nameBuf, 0, nonZeroIndex + 1)
      val fieldType = in.readByte();
      val dataType = DataType.valueOf(fieldType)
      if (dataType == null)
        throw new DbfException(
          String.format(
            "Unsupported Dbf field type: %s",
            Integer.toString(fieldType, 16)))
      in.skipBytes(4)
      val fieldLength = in.readUnsignedByte()
      val decimalCount = in.readByte()
      in.skipBytes(2)
      val workAreaId = in.readByte()
      in.skipBytes(2)
      val setFieldsFlag = in.readByte()
      in.skipBytes(7)
      val indexFieldFlag = in.readByte()
      new Field(index, name, dataType, fieldLength, decimalCount, workAreaId, setFieldsFlag, indexFieldFlag)
    } catch {
      case e: IOException => throw new DbfException("Cannot read Dbf field", e);
    }
}