io.github.h5jan.core.Util Maven / Gradle / Ivy
/*-
*******************************************************************************
* Copyright (c) 2019 Halliburton International, Inc.
*
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
*******************************************************************************/
package io.github.h5jan.core;
import org.eclipse.dawnsci.analysis.tree.impl.AttributeImpl;
import org.eclipse.dawnsci.nexus.NexusException;
import org.eclipse.january.dataset.ILazyWriteableDataset;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
public class Util {
private static final ObjectMapper mapper = new ObjectMapper();
/**
* Attributes to tag data
*/
static void setReferenceAttributes(NxsFile nfile, String h5Path, String name) throws NexusException {
nfile.addAttribute("/", new AttributeImpl(Constants.PATH, h5Path));
nfile.addAttribute("/", new AttributeImpl(Constants.DATA_PATH, h5Path+"/"+name));
}
/**
* Column names and metadata written
* @param hFile
* @param h5Path
* @param names
* @throws NexusException
* @throws JsonProcessingException
*/
public static void setMetaAttributues(NxsFile hFile, String h5Path, DataFrame data) throws NexusException, JsonProcessingException {
if (data.getName() == null) {
throw new IllegalArgumentException("The data frame must have a name!");
}
if (data.getColumnNames() == null) {
throw new IllegalArgumentException("The columns must be named!");
}
hFile.addAttribute(h5Path, new AttributeImpl(Constants.NAME, data.getName()));
hFile.addAttribute(h5Path, new AttributeImpl(Constants.COL_NAMES, data.getColumnNames()));
if (data!=null) {
// Difficult to store all metadata because ILazyDataset only provides
// access by type and we do not know the type at the point of serialization to hdf5.
// So we just save the first one of any type. This means only one entry of
// metadata is supported per data frame.
NxsMetadata meta = data.getMetadata();
if (meta!=null) {
if (meta instanceof GenericMetadata) {
JsonNode node = ((GenericMetadata)meta).getNode();
hFile.addAttribute(h5Path, new AttributeImpl(Constants.META, mapper.writeValueAsString(node)));
hFile.addAttribute(h5Path, new AttributeImpl(Constants.META_TYPE, meta.getClass().getName()));
} else {
// The metadata set must serialize to json or this call will fail.
hFile.addAttribute(h5Path, new AttributeImpl(Constants.META_TYPE, meta.getClass().getName()));
hFile.addAttribute(h5Path, new AttributeImpl(Constants.META, mapper.writeValueAsString(meta)));
}
}
}
}
}