com.aerospike.mapper.tools.utils.ParserUtils Maven / Gradle / Ivy

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package com.aerospike.mapper.tools.utils;

public class ParserUtils {
	private static final ParserUtils instance = new ParserUtils();
	public static ParserUtils getInstance() {
		return instance;
	}
	
	private ParserUtils() {
	}
	
	public String get(String value) {
		return parseString(value);
	}
	
	private String parseString(String value) {
		if (value == null || value.length() <= 3) {
			return value;
		}
		if ((value.startsWith("${") || value.startsWith("#{")) && value.endsWith("}")) {
			// Strip off the identifying tokens and split into value and default
			String[] values = value.substring(2, value.length()-1).split(":");
			
			String translatedValue;
			if (value.startsWith("${")) {
				translatedValue = System.getProperty(values[0]);
			}
			else {
				translatedValue = System.getenv(values[0]);
			}
			
			if (translatedValue != null) {
				return translatedValue;
			}
			if (values.length > 1) {
				// A default was provided, use it.
				return values[1];
			}
			// No environment/property variable was found, no default, return null
			return null;
		}
		return value;
	}
}