ucar.nc2.iosp.mcidas.McIDASGridReader Maven / Gradle / Ivy
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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.
/*
*
* Copyright 1998-2009 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.mcidas;
import edu.wisc.ssec.mcidas.*;
import ucar.grid.GridIndex;
import ucar.nc2.iosp.grid.*;
import ucar.unidata.io.RandomAccessFile;
import java.io.IOException;
import java.util.*;
/**
* Read grid(s) from a McIDAS grid file
*/
public class McIDASGridReader {
/** The file */
protected RandomAccessFile rf;
/** An error message */
private String errorMessage;
/** Grid index */
private GridIndex gridIndex;
/** swap flag */
protected boolean needToSwap = false;
/** hashMap of GridDefRecords */
private HashMap gdsMap = new HashMap();
/** maximum number of grids in a file */
// is this the right number?
private static final int MAX_GRIDS = 999999;
/**
* Bean ctor
*/
public McIDASGridReader() {}
/**
* Create a McIDASGrid Reader from the file
*
* @param filename filename
*
* @throws IOException problem reading file
*/
public McIDASGridReader(String filename) throws IOException {
this(new RandomAccessFile(filename, "r", 2048));
}
/**
* Create a McIDASGrid Reader from the file
*
* @param raf RandomAccessFile
*
* @throws IOException problem reading file
*/
public McIDASGridReader(RandomAccessFile raf) throws IOException {
init(raf);
}
/**
* Initialize the file, read in all the metadata (ala DM_OPEN)
*
* @param raf RandomAccessFile to read.
*
* @throws IOException problem reading file
*/
public final void init(RandomAccessFile raf) throws IOException {
init(raf, true);
}
/**
* Initialize the file, read in all the metadata (ala DM_OPEN)
*
* @param fullCheck for a full check reading grids
* @param raf RandomAccessFile to read.
*
* @throws IOException problem reading file
*/
public final void init(RandomAccessFile raf, boolean fullCheck)
throws IOException {
rf = raf;
raf.order(RandomAccessFile.BIG_ENDIAN);
boolean ok = init(fullCheck);
if ( !ok) {
throw new IOException("Unable to open McIDAS Grid file: "
+ errorMessage);
}
}
/**
* Initialize this reader. Get the Grid specific info
*
* @return true if successful
*
* @throws IOException problem reading the data
*/
protected boolean init() throws IOException {
return init(true);
}
/**
* Initialize this reader. Get the Grid specific info
*
* @param fullCheck for a full check reading grids
*
* @return true if successful
*
* @throws IOException problem reading the data
*/
protected boolean init(boolean fullCheck) throws IOException {
if (rf == null) {
logError("File is null");
return false;
}
gridIndex = new GridIndex(rf.getLocation());
rf.order(RandomAccessFile.BIG_ENDIAN);
int numEntries = Math.abs(readInt(10));
if (numEntries > 1000000) {
needToSwap = true;
numEntries = Math.abs(McIDASUtil.swbyt4(numEntries));
}
if (numEntries > MAX_GRIDS) {
return false;
}
//System.out.println("need to Swap = " + needToSwap);
//System.out.println("number entries="+numEntries);
// go back to the beginning
rf.seek(0);
// read the fileheader
String label = rf.readString(32);
// GEMPAK too closely like McIDAS
if (label.indexOf("GEMPAK DATA MANAGEMENT FILE") >= 0) {
logError("label indicates this is a GEMPAK grid");
return false;
} else { // check that they are all printable ASCII chars
for (int i=0; i 0) {
file = args[0];
}
McIDASGridReader mg = new McIDASGridReader(file);
GridIndex gridIndex = mg.getGridIndex();
List grids = gridIndex.getGridRecords();
System.out.println("found " + grids.size() + " grids");
int num = Math.min(grids.size(), 10);
for (int i = 0; i < num; i++) {
System.out.println(grids.get(i));
}
}
}