com.dexcoder.dal.batis.parser.PropertyParser Maven / Gradle / Ivy

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package com.dexcoder.dal.batis.parser;

import java.util.Properties;

import com.dexcoder.dal.handler.GenericTokenParser;
import com.dexcoder.dal.handler.TokenHandler;

/**
 * Created by liyd on 2015-11-24.
 */
public class PropertyParser {

    private PropertyParser() {
        // Prevent Instantiation
    }

    public static String parse(String string, Properties variables) {
        VariableTokenHandler handler = new VariableTokenHandler(variables);
        GenericTokenParser parser = new GenericTokenParser("${", "}", handler);
        return parser.parse(string);
    }

    private static class VariableTokenHandler implements TokenHandler {
        private Properties variables;

        public VariableTokenHandler(Properties variables) {
            this.variables = variables;
        }

        public String handleToken(String content) {
            if (variables != null && variables.containsKey(content)) {
                return variables.getProperty(content);
            }
            return "${" + content + "}";
        }
    }
}