PropertiesUtils.java

package com.proalpha.pds.projconf.properties;
 
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Properties;
 
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
 
final class PropertiesUtils {
 
    private static final Logger logger = LoggerFactory.getLogger(PropertiesUtils.class);
 
    private PropertiesUtils() {
        super();
    }
 
    public static void storeProperties(Properties properties, File outputFile) throws IOException {
 
        if (!outputFile.exists()) {
            File parentDir = outputFile.getParentFile();
            if ((parentDir != null) && (!parentDir.exists())) {
                parentDir.mkdirs();
            }
            boolean created = outputFile.createNewFile();
 
            // createNewFile returns false if the file already exists
            if (!created)
                logger.warn("The file {} already existed.", outputFile);
        }
 
        try (FileOutputStream out = new FileOutputStream(outputFile);) {
            properties.store(out, "");
        }
 
    }
 
    public static Properties loadProperties(File file) throws IOException {
 
        Properties properties = new Properties();
 
        if (file == null) {
            throw new IllegalArgumentException("Properties file is null.");
        }
 
        if (!file.exists()) {
            throw new IllegalArgumentException(
                    String.format("%s file does not exits or is null.", file.getAbsolutePath()));
        }
 
        try (FileInputStream reader = new FileInputStream(file)) {
            properties.load(reader);
        }
 
        return properties;
 
    }
}