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The NetCDF-Java Library is a Java interface to NetCDF files, as well as to many other types of scientific data formats.
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/*
 * Copyright 2010-2012 University Corporation for Atmospheric Research/Unidata
 *
 * Portions of this software were developed by the Unidata Program at the
 * University Corporation for Atmospheric Research.
 *
 * Access and use of this software shall impose the following obligations
 * and understandings on the user. The user is granted the right, without
 * any fee or cost, to use, copy, modify, alter, enhance and distribute
 * this software, and any derivative works thereof, and its supporting
 * documentation for any purpose whatsoever, provided that this entire
 * notice appears in all copies of the software, derivative works and
 * supporting documentation.  Further, UCAR requests that the user credit
 * UCAR/Unidata in any publications that result from the use of this
 * software or in any product that includes this software. The names UCAR
 * and/or Unidata, however, may not be used in any advertising or publicity
 * to endorse or promote any products or commercial entity unless specific
 * written permission is obtained from UCAR/Unidata. The user also
 * understands that UCAR/Unidata is not obligated to provide the user with
 * any support, consulting, training or assistance of any kind with regard
 * to the use, operation and performance of this software nor to provide
 * the user with any updates, revisions, new versions or "bug fixes."
 *
 * THIS SOFTWARE IS PROVIDED BY UCAR/UNIDATA "AS IS" AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL UCAR/UNIDATA BE LIABLE FOR ANY SPECIAL,
 * INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING
 * FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
 * NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
 * WITH THE ACCESS, USE OR PERFORMANCE OF THIS SOFTWARE.
 */
package ucar.nc2.iosp.noaa;

import ucar.ma2.*;
import ucar.unidata.io.RandomAccessFile;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * Create a StructureData by using a java.util.regex.Pattern on an ascii file.
 *
 * @author caron
 * @since Feb 26, 2011
 */
public class StructureDataRegexp extends StructureData {
  protected Matcher matcher;

  public StructureDataRegexp(StructureMembers members, Matcher m) {
    super(members);
    this.matcher = m;
  }

  protected Object parse(DataType dt, VinfoField vinfo) throws NumberFormatException {
    return parse(dt, vinfo, vinfo.fldno);
  }

  protected Object parse(DataType dt, VinfoField vinfo, int fldno) throws NumberFormatException {
    String svalue;
    if (fldno <= matcher.groupCount())
      svalue = matcher.group(fldno);
    else
      svalue = " ";
    //  System.out.printf("HEY! %d>= %d %n", field, matcher.groupCount());
    //String svalue = matcher.group(field);

    if (dt == DataType.STRING)
      return svalue.trim();
    else if (dt == DataType.CHAR)
      return svalue;

    try {
      svalue = svalue.trim();
      boolean isBlank = (svalue.length() == 0);
      if (dt == DataType.DOUBLE)
        return isBlank ? 0.0 : new Double(svalue);
      else if (dt == DataType.FLOAT) {
        float result = isBlank ? 0.0f : new Float(svalue);
        return (vinfo.hasScale) ? result * vinfo.scale : result;
      } else if (dt == DataType.INT) {
        return isBlank ? 0 : new Integer(svalue);
      }
      else if (dt == DataType.LONG)
        return isBlank ? 0 : new Long(svalue);

    } catch (NumberFormatException e) {
      System.out.printf("  %d = <%s> %n", fldno, svalue);
      throw e;
    }

    return null;
  }


  @Override
  public Array getArray(StructureMembers.Member m) {
    VinfoField f = (VinfoField) m.getDataObject();

    if (m.getDataType() == DataType.STRING) {
      String result = matcher.group(f.fldno);
      return new ArrayObject(String.class, new int[] {},  new Object[] {result.trim()});

    } else if (m.getDataType() == DataType.SEQUENCE) {
      return getArraySequence(m);

    } else if (!m.isScalar()) {
      if (m.getDataType() == DataType.FLOAT) {
        float[] ja = getJavaArrayFloat(m);
        return Array.factory(DataType.FLOAT, m.getShape(), ja);

      } else if (m.getDataType() == DataType.CHAR) {
        char[] ja = getJavaArrayChar(m);
        return Array.factory(DataType.CHAR, m.getShape(), ja);

      } else if (m.getDataType() == DataType.BYTE) {
        byte[] ja = getJavaArrayByte(m);
        return Array.factory(DataType.BYTE, m.getShape(), ja);
      }
    }

    Object result = parse(m.getDataType(), f);
    if (m.getDataType() == DataType.CHAR)
      return new ArrayChar((String) result);
    else
      return new ArrayScalar(result);
  }

  @Override
  public float convertScalarFloat(StructureMembers.Member m) {
    VinfoField f = (VinfoField) m.getDataObject();
    return ((Number) parse(m.getDataType(), f)).floatValue();
  }

  @Override
  public double convertScalarDouble(StructureMembers.Member m) {
    VinfoField f = (VinfoField) m.getDataObject();
    return ((Number) parse(m.getDataType(), f)).doubleValue();
  }

  @Override
  public int convertScalarInt(StructureMembers.Member m) {
    VinfoField f = (VinfoField) m.getDataObject();
    return ((Number) parse(m.getDataType(), f)).intValue();
  }

  @Override
  public long convertScalarLong(StructureMembers.Member m) {
    VinfoField f = (VinfoField) m.getDataObject();
    return ((Number) parse(m.getDataType(), f)).longValue();
  }

  @Override
  public double getScalarDouble(StructureMembers.Member m) {
    VinfoField f = (VinfoField) m.getDataObject();
    return (Double) parse(m.getDataType(), f);
  }

  @Override
  public double[] getJavaArrayDouble(StructureMembers.Member m) {
    return new double[0];  //To change body of implemented methods use File | Settings | File Templates.
  }

  @Override
  public float getScalarFloat(StructureMembers.Member m) {
    VinfoField f = (VinfoField) m.getDataObject();
    Object result =  parse(m.getDataType(), f);
    return (result instanceof Float) ? (Float) result : ((Double) result).floatValue();
  }

  @Override
  public float[] getJavaArrayFloat(StructureMembers.Member m) {
    int n = m.getSize();
    float[] result = new float[n];
    VinfoField f = (VinfoField) m.getDataObject();
    for (int i=0; i