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Diffstat (limited to 'HDF5Examples/JAVA/H5T/H5Ex_T_String.java')
| -rw-r--r-- | HDF5Examples/JAVA/H5T/H5Ex_T_String.java | 307 |
1 files changed, 307 insertions, 0 deletions
diff --git a/HDF5Examples/JAVA/H5T/H5Ex_T_String.java b/HDF5Examples/JAVA/H5T/H5Ex_T_String.java new file mode 100644 index 0000000..fa16464 --- /dev/null +++ b/HDF5Examples/JAVA/H5T/H5Ex_T_String.java @@ -0,0 +1,307 @@ +/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * + * Copyright by The HDF Group. * + * All rights reserved. * + * * + * This file is part of HDF5. The full HDF5 copyright notice, including * + * terms governing use, modification, and redistribution, is contained in * + * the COPYING file, which can be found at the root of the source code * + * distribution tree, or in https://www.hdfgroup.org/licenses. * + * If you do not have access to either file, you may request a copy from * + * help@hdfgroup.org. * + * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */ + +/************************************************************ + This example shows how to read and write string datatypes + to a dataset. The program first writes strings to a + dataset with a dataspace of DIM0, then closes the file. + Next, it reopens the file, reads back the data, and + outputs it to the screen. + ************************************************************/ + +import hdf.hdf5lib.H5; +import hdf.hdf5lib.HDF5Constants; + +public class H5Ex_T_String { + private static String FILENAME = "H5Ex_T_String.h5"; + private static String DATASETNAME = "DS1"; + private static final int DIM0 = 4; + private static final int SDIM = 8; + private static final int RANK = 1; + + private static void CreateDataset() + { + long file_id = HDF5Constants.H5I_INVALID_HID; + long memtype_id = HDF5Constants.H5I_INVALID_HID; + long filetype_id = HDF5Constants.H5I_INVALID_HID; + long dataspace_id = HDF5Constants.H5I_INVALID_HID; + long dataset_id = HDF5Constants.H5I_INVALID_HID; + long[] dims = {DIM0}; + byte[][] dset_data = new byte[DIM0][SDIM]; + StringBuffer[] str_data = {new StringBuffer("Parting"), new StringBuffer("is such"), + new StringBuffer("sweet"), new StringBuffer("sorrow.")}; + + // Create a new file using default properties. + try { + file_id = H5.H5Fcreate(FILENAME, HDF5Constants.H5F_ACC_TRUNC, HDF5Constants.H5P_DEFAULT, + HDF5Constants.H5P_DEFAULT); + } + catch (Exception e) { + e.printStackTrace(); + } + + // Create file and memory datatypes. For this example we will save + // the strings as FORTRAN strings, therefore they do not need space + // for the null terminator in the file. + try { + filetype_id = H5.H5Tcopy(HDF5Constants.H5T_FORTRAN_S1); + if (filetype_id >= 0) + H5.H5Tset_size(filetype_id, SDIM - 1); + } + catch (Exception e) { + e.printStackTrace(); + } + try { + memtype_id = H5.H5Tcopy(HDF5Constants.H5T_C_S1); + if (memtype_id >= 0) + H5.H5Tset_size(memtype_id, SDIM); + } + catch (Exception e) { + e.printStackTrace(); + } + + // Create dataspace. Setting maximum size to NULL sets the maximum + // size to be the current size. + try { + dataspace_id = H5.H5Screate_simple(RANK, dims, null); + } + catch (Exception e) { + e.printStackTrace(); + } + + // Create the dataset and write the string data to it. + try { + if ((file_id >= 0) && (filetype_id >= 0) && (dataspace_id >= 0)) + dataset_id = + H5.H5Dcreate(file_id, DATASETNAME, filetype_id, dataspace_id, HDF5Constants.H5P_DEFAULT, + HDF5Constants.H5P_DEFAULT, HDF5Constants.H5P_DEFAULT); + } + catch (Exception e) { + e.printStackTrace(); + } + + // Write the data to the dataset. + try { + for (int indx = 0; indx < DIM0; indx++) { + for (int jndx = 0; jndx < SDIM; jndx++) { + if (jndx < str_data[indx].length()) + dset_data[indx][jndx] = (byte)str_data[indx].charAt(jndx); + else + dset_data[indx][jndx] = 0; + } + } + if ((dataset_id >= 0) && (memtype_id >= 0)) + H5.H5Dwrite(dataset_id, memtype_id, HDF5Constants.H5S_ALL, HDF5Constants.H5S_ALL, + HDF5Constants.H5P_DEFAULT, dset_data); + } + catch (Exception e) { + e.printStackTrace(); + } + + // End access to the dataset and release resources used by it. + try { + if (dataset_id >= 0) + H5.H5Dclose(dataset_id); + } + catch (Exception e) { + e.printStackTrace(); + } + + // Terminate access to the data space. + try { + if (dataspace_id >= 0) + H5.H5Sclose(dataspace_id); + } + catch (Exception e) { + e.printStackTrace(); + } + + // Terminate access to the file type. + try { + if (filetype_id >= 0) + H5.H5Tclose(filetype_id); + } + catch (Exception e) { + e.printStackTrace(); + } + + // Terminate access to the mem type. + try { + if (memtype_id >= 0) + H5.H5Tclose(memtype_id); + } + catch (Exception e) { + e.printStackTrace(); + } + + // Close the file. + try { + if (file_id >= 0) + H5.H5Fclose(file_id); + } + catch (Exception e) { + e.printStackTrace(); + } + } + + private static void ReadDataset() + { + long file_id = HDF5Constants.H5I_INVALID_HID; + long filetype_id = HDF5Constants.H5I_INVALID_HID; + long memtype_id = HDF5Constants.H5I_INVALID_HID; + long dataspace_id = HDF5Constants.H5I_INVALID_HID; + long dataset_id = HDF5Constants.H5I_INVALID_HID; + long sdim = 0; + long[] dims = {DIM0}; + byte[][] dset_data; + StringBuffer[] str_data; + + // Open an existing file. + try { + file_id = H5.H5Fopen(FILENAME, HDF5Constants.H5F_ACC_RDONLY, HDF5Constants.H5P_DEFAULT); + } + catch (Exception e) { + e.printStackTrace(); + } + + // Open an existing dataset. + try { + if (file_id >= 0) + dataset_id = H5.H5Dopen(file_id, DATASETNAME, HDF5Constants.H5P_DEFAULT); + } + catch (Exception e) { + e.printStackTrace(); + } + + // Get the datatype and its size. + try { + if (dataset_id >= 0) + filetype_id = H5.H5Dget_type(dataset_id); + if (filetype_id >= 0) { + sdim = H5.H5Tget_size(filetype_id); + sdim++; // Make room for null terminator + } + } + catch (Exception e) { + e.printStackTrace(); + } + + // Get dataspace and allocate memory for read buffer. + try { + if (dataset_id >= 0) + dataspace_id = H5.H5Dget_space(dataset_id); + } + catch (Exception e) { + e.printStackTrace(); + } + + try { + if (dataspace_id >= 0) + H5.H5Sget_simple_extent_dims(dataspace_id, dims, null); + } + catch (Exception e) { + e.printStackTrace(); + } + + // Allocate space for data. + dset_data = new byte[(int)dims[0]][(int)sdim]; + str_data = new StringBuffer[(int)dims[0]]; + + // Create the memory datatype. + try { + memtype_id = H5.H5Tcopy(HDF5Constants.H5T_C_S1); + if (memtype_id >= 0) + H5.H5Tset_size(memtype_id, sdim); + } + catch (Exception e) { + e.printStackTrace(); + } + + // Read data. + try { + if ((dataset_id >= 0) && (memtype_id >= 0)) + H5.H5Dread(dataset_id, memtype_id, HDF5Constants.H5S_ALL, HDF5Constants.H5S_ALL, + HDF5Constants.H5P_DEFAULT, dset_data); + byte[] tempbuf = new byte[(int)sdim]; + for (int indx = 0; indx < (int)dims[0]; indx++) { + for (int jndx = 0; jndx < sdim; jndx++) { + tempbuf[jndx] = dset_data[indx][jndx]; + } + str_data[indx] = new StringBuffer(new String(tempbuf).trim()); + } + } + catch (Exception e) { + e.printStackTrace(); + } + + // Output the data to the screen. + for (int indx = 0; indx < dims[0]; indx++) { + System.out.println(DATASETNAME + " [" + indx + "]: " + str_data[indx]); + } + System.out.println(); + + // End access to the dataset and release resources used by it. + try { + if (dataset_id >= 0) + H5.H5Dclose(dataset_id); + } + catch (Exception e) { + e.printStackTrace(); + } + + // Terminate access to the data space. + try { + if (dataspace_id >= 0) + H5.H5Sclose(dataspace_id); + } + catch (Exception e) { + e.printStackTrace(); + } + + // Terminate access to the file type. + try { + if (filetype_id >= 0) + H5.H5Tclose(filetype_id); + } + catch (Exception e) { + e.printStackTrace(); + } + + // Terminate access to the mem type. + try { + if (memtype_id >= 0) + H5.H5Tclose(memtype_id); + } + catch (Exception e) { + e.printStackTrace(); + } + + // Close the file. + try { + if (file_id >= 0) + H5.H5Fclose(file_id); + } + catch (Exception e) { + e.printStackTrace(); + } + } + + public static void main(String[] args) + { + H5Ex_T_String.CreateDataset(); + // Now we begin the read section of this example. Here we assume + // the dataset and array have the same name and rank, but can have + // any size. Therefore we must allocate a new array to read in + // data using malloc(). + H5Ex_T_String.ReadDataset(); + } +} |