com.socrata.utils.GeneralUtils Maven / Gradle / Ivy
package com.socrata.utils;
import au.com.bytecode.opencsv.CSVReader;
import com.google.common.base.Function;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.Lists;
import com.google.common.collect.Maps;
import org.apache.commons.lang3.StringUtils;
import javax.annotation.Nullable;
import java.io.*;
import java.util.ArrayList;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
/**
*
* General util functions, that could have come from elsewhere, but don't want libraries
*/
public class GeneralUtils
{
/**
* Closes a stream, while ignoring any exceptions.
*
* @param is input stream to close
*/
public static void closeQuietly(final InputStream is) {
try {
if (is != null) {
is.close();
}
} catch (IOException ioe) {
//Ignore
}
}
/**
* Returns the canonical path for a file, but if there is an
* IO exception while trying to get it, will return an absolute path.
*
* @param file input stream to close
*/
public static String bestFilePath(final File file) {
try {
return file.getCanonicalPath();
} catch (IOException ioe) {
return file.getAbsolutePath();
}
}
/**
* Reads in a CSV file as maps of objects. You cannot assume anything
* smart happens in terms of type conversion, so everything will be a String.
*
* @param csvFile file to read in
* @return List of objects hydrated from the csv file. Each object will be a map from column
* name to value.
* @throws IOException
*/
public static List> readInCsv(final File csvFile) throws IOException
{
FileReader fileReader = new FileReader(csvFile);
CSVReader reader = new CSVReader(fileReader);
List> retVal = new ArrayList>();
String[] headers = reader.readNext();
if (headers != null) {
String[] currLine;
while ((currLine = reader.readNext()) != null) {
ImmutableMap.Builder builder = ImmutableMap.builder();
for (int i=0; i