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Diffstat (limited to 'doc/html/Tutor/examples/java/DatasetRdWt.java')
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diff --git a/doc/html/Tutor/examples/java/DatasetRdWt.java b/doc/html/Tutor/examples/java/DatasetRdWt.java new file mode 100644 index 0000000..4c26d0f --- /dev/null +++ b/doc/html/Tutor/examples/java/DatasetRdWt.java @@ -0,0 +1,213 @@ +/****************************************************************** + * DatasetRdWt.java (for HDF5 tutorial lesson 6) + * + * -- Reading and Writing an existing Dataset + * (a java conversion from h5_rdwt.c) + * + ******************************************************************/ + +import ncsa.hdf.hdf5lib.*; +import ncsa.hdf.hdf5lib.exceptions.*; + +public class DatasetRdWt +{ + public static void main(String []argv) + { + final String FILE = "dset.h5"; + int file_id = -1; // file identifier + int dataset_id = -1; // dataset identifier + int status = -1; + int[][] dset_data = new int[4][6]; + + // Initialize the dataset. + for (int i = 0; i < 4; i++) + for (int j = 0; j < 6; j++) + dset_data[i][j] = i * 6 + j + 1; + + // Open an existing file + file_id = H5Fopen_wrap (FILE, HDF5Constants.H5F_ACC_RDWR, + HDF5Constants.H5P_DEFAULT); + + // Open an existing dataset. + dataset_id = H5Dopen_wrap (file_id, "/dset"); + + // Write the dataset. + status = H5Dwrite_wrap + (dataset_id, H5.J2C (HDF5CDataTypes.JH5T_NATIVE_INT), + HDF5Constants.H5S_ALL, HDF5Constants.H5S_ALL, + HDF5Constants.H5P_DEFAULT, dset_data); + + status = H5Dread_wrap + (dataset_id, H5.J2C (HDF5CDataTypes.JH5T_NATIVE_INT), + HDF5Constants.H5S_ALL, HDF5Constants.H5S_ALL, + HDF5Constants.H5P_DEFAULT, dset_data); + + // Close the dataset. + status = H5Dclose_wrap (dataset_id); + + // Close the file. + status = H5Fclose_wrap (file_id); + } + + + // Help function for opening an existing file + public static int H5Fopen_wrap (String name, int flags, int access_id) + { + int file_id = -1; // file identifier + try + { + // Create a new file using default file properties. + file_id = H5.H5Fopen (name, flags, access_id); + } + catch (HDF5Exception hdf5e) + { + System.out.println + ("DatasetRdWt.H5Fopen_wrap() with HDF5Exception: " + + hdf5e.getMessage()); + } + catch (Exception e) + { + System.out.println + ("DatasetRdWt.H5Fopen_wrap() with other Exception: " + + e.getMessage()); + } + return file_id; + } + + + // Help function for opening an existing dataset + public static int H5Dopen_wrap (int loc_id, String name) + { + int dataset_id = -1; // dataset identifier + + try + { + // Opening an existing dataset + dataset_id = H5.H5Dopen (loc_id, name); + } + catch (HDF5Exception hdf5e) + { + System.out.println + ("DatasetRdWt.H5Dopen_wrap() with HDF5Exception: " + + hdf5e.getMessage()); + } + catch (Exception e) + { + System.out.println + ("DatasetRdWt.H5Dopen_wrap() with other Exception: " + + e.getMessage()); + } + return dataset_id; + } + + + // Help function for writing the dataset + public static int H5Dwrite_wrap (int dataset_id, int mem_type_id, + int mem_space_id, int file_space_id, + int xfer_plist_id, Object buf) + { + int status = -1; + + try + { + // Write the dataset. + status = H5.H5Dwrite (dataset_id, mem_type_id, mem_space_id, + file_space_id, xfer_plist_id, buf); + } + catch (HDF5Exception hdf5e) + { + System.out.println + ("DatasetRdWt.H5Dwrite_wrap() with HDF5Exception: " + + hdf5e.getMessage()); + } + catch (Exception e) + { + System.out.println + ("DatasetRdWt.H5Dwrite_wrap() with other exception: " + + e.getMessage()); + } + return status; + } + + + // Help function for reading the dataset + public static int H5Dread_wrap (int dataset_id, int mem_type_id, + int mem_space_id, int file_space_id, + int xfer_plist_id, Object obj) + { + int status = -1; + + try + { + // Read the dataset. + status = H5.H5Dread (dataset_id, mem_type_id, mem_space_id, + file_space_id, xfer_plist_id, obj); + } + catch (HDF5Exception hdf5e) + { + System.out.println + ("DatasetRdWt.H5Dread_wrap() with HDF5Exception: " + + hdf5e.getMessage()); + } + catch (Exception e) + { + System.out.println + ("DatasetRdWt.H5Dread_wrap() with other exception: " + + e.getMessage()); + } + return status; + } + + + // Help function for ending access to the dataset and releasing + // resources used by it. + public static int H5Dclose_wrap (int dataset_id) + { + int status = -1; + + try + { + // End access to the dataset and release resources used by it. + status = H5.H5Dclose (dataset_id); + } + catch (HDF5Exception hdf5e) + { + System.out.println + ("DatasetRdWt.H5Dclose_wrap() with HDF5Exception: " + + hdf5e.getMessage()); + } + catch (Exception e) + { + System.out.println + ("DatasetRdWt.H5Dclose_wrap() with other exception: " + + e.getMessage()); + } + return status; + } + + + // Help function for terminating access to the file. + public static int H5Fclose_wrap (int file_id) + { + int status = -1; + + try + { + // Terminate access to the file. + status = H5.H5Fclose (file_id); + } + catch (HDF5Exception hdf5e) + { + System.out.println + ("DatasetRdWt.H5Fclose_wrap() with HDF5Exception: " + + hdf5e.getMessage()); + } + catch (Exception e) + { + System.out.println + ("DatasetRdWt.H5Fclose_wrap() with other exception: " + + e.getMessage()); + } + return status; + } +} |