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ucar.nc2.iosp.netcdf3.N3raf Maven / Gradle / Ivy
/*
* 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.netcdf3;
import ucar.ma2.*;
import ucar.nc2.constants.CDM;
import ucar.nc2.iosp.Layout;
import ucar.nc2.iosp.IospHelper;
import java.nio.channels.WritableByteChannel;
/**
* Use our RandomAccessFile class to read and write.
* @author caron
*/
public class N3raf extends N3iosp {
protected void _open(ucar.unidata.io.RandomAccessFile raf) throws java.io.IOException {
}
protected void _create(ucar.unidata.io.RandomAccessFile raf) throws java.io.IOException {
}
/**
* Read data subset from file for a variable, create primitive array.
* @param index handles skipping around in the file.
* @param dataType dataType of the variable
* @return primitive array with data read in
*/
protected Object readData( Layout index, DataType dataType) throws java.io.IOException {
return IospHelper.readDataFill(raf, index, dataType, null, -1);
}
/**
* Read data subset from file for a variable, to WritableByteChannel.
* Will send as bigendian, since thats what the underlying file has.
* @param index handles skipping around in the file.
* @param dataType dataType of the variable
*/
protected long readData( Layout index, DataType dataType, WritableByteChannel out) throws java.io.IOException {
long count = 0;
if ((dataType == DataType.BYTE) || (dataType == DataType.CHAR) || (dataType == DataType.ENUM1)) {
while (index.hasNext()) {
Layout.Chunk chunk = index.next();
count += raf.readToByteChannel( out, chunk.getSrcPos(), chunk.getNelems());
}
} else if ((dataType == DataType.SHORT) || (dataType == DataType.ENUM2)) {
while (index.hasNext()) {
Layout.Chunk chunk = index.next();
count += raf.readToByteChannel( out, chunk.getSrcPos(), 2 * chunk.getNelems());
}
} else if ((dataType == DataType.INT) || (dataType == DataType.FLOAT) || (dataType == DataType.ENUM4)) {
while (index.hasNext()) {
Layout.Chunk chunk = index.next();
count += raf.readToByteChannel( out, chunk.getSrcPos(), 4 * chunk.getNelems());
}
} else if ((dataType == DataType.DOUBLE) || (dataType == DataType.LONG)) {
while (index.hasNext()) {
Layout.Chunk chunk = index.next();
count += raf.readToByteChannel( out, chunk.getSrcPos(), 8 * chunk.getNelems());
}
}
return count;
}
/**
* write data to a file for a variable.
* @param values write this data.
* @param index handles skipping around in the file.
* @param dataType dataType of the variable
*/
protected void writeData( Array values, Layout index, DataType dataType) throws java.io.IOException {
if ((dataType == DataType.BYTE) || (dataType == DataType.CHAR)) {
IndexIterator ii = values.getIndexIterator();
while (index.hasNext()) {
Layout.Chunk chunk = index.next();
raf.seek ( chunk.getSrcPos());
for (int k=0; k© 2015 - 2025 Weber Informatics LLC | Privacy Policy
