Loader.java

package xml_ini;
import java.io.*;

import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathConstants;
import javax.xml.xpath.XPathFactory;
import javax.xml.xpath.XPathExpression;

import org.w3c.dom.Document;
/** ôàéë, êîòîðûé çàãðóæàåò ïåðåìåííûå èç óêàçàííûõ ïóòåé âèäà XPath èç ïðî÷èòàííîãî XML ôàéëà*/
public class Loader {
	/** âûâîä îòëàäî÷íîé èíôîðìàöèè */
	private static void debug(String information){
		System.out.print("Loader");
		System.out.print(" DEBUG ");
		System.out.println(information);
	}
	/** âûâîä îøèáî÷íîé èíôîðìàöèè */
	private static void error(String information){
		System.out.print("Loader");
		System.out.print(" ERROR ");
		System.out.println(information);
	}
	
	private Document field_document;
	private XPath field_xpath;
	
	/** ôàéë, êîòîðûé çàãðóæàåò ïåðåìåííûå èç óêàçàííûõ ïóòåé âèäà XPath èç ïðî÷èòàííîãî XML ôàéëà*/
	public Loader(String path_to_xml) throws Exception {
		// ÷òåíèå ôàéëà 
		File file=new File(path_to_xml);
		if(!file.exists()){
			throw new Exception();
		}
		// ñîçäàíèå äîêóìåíòà XML 
		this.field_document=getXmlByPath(path_to_xml);
		// ñîçäàíèå îáúåêòà XPath
		XPathFactory factory=XPathFactory.newInstance();
		this.field_xpath=factory.newXPath();
	}
	
	/** ïîëó÷èòü XML ôàéë èç óêàçàííîãî àáñîëþòíîãî ïóòè */
	private Document getXmlByPath(String path_to_xml) throws Exception{
        Document return_value=null;
		javax.xml.parsers.DocumentBuilderFactory document_builder_factory=javax.xml.parsers.DocumentBuilderFactory.newInstance();
        // óñòàíîâèòü íåïðîâåðÿåìîå ïîðîæäåíèå Parser-îâ
        document_builder_factory.setValidating(false);
        try {
            // ïîëó÷åíèå àíàëèçàòîðà
            javax.xml.parsers.DocumentBuilder parser=document_builder_factory.newDocumentBuilder();
            return_value=parser.parse(new File(path_to_xml));
        }catch(Exception ex){
        	error("XmlExchange.java ERROR");
        	throw ex;
        }
		return return_value;
	}
	
	/** ïîëó÷èòü çíà÷åíèå èç XML ôàéëà ñîãëàñíî çàäàííîìó XPath ïóòè <br>
	 * @return âîçâðàùàåò ëèáî ïóñòóþ ñòðîêó, ëèáî çíà÷åíèå 
	 * */
	public String getValue(String path){
		String return_value="";
		try{
			XPathExpression expression=this.field_xpath.compile(path);
			return_value=(String) expression.evaluate(this.field_document,XPathConstants.STRING);
		}catch(Exception ex){
			error("getValue: Exception:"+ex.getMessage());
		}
		return return_value;
	}

	/** ïîëó÷èòü çíà÷åíèå èç XML ôàéëà ñîãëàñíî çàäàííîìó XPath ïóòè <br>
	 * @return âîçâðàùàåò ëèáî default_value 
	 * */
	public int getInteger(String path,int default_value){
		int return_value=default_value;
		try{
			return_value=Integer.parseInt(getValue(path));
		}catch(Exception ex){
			error("getInteger: Exception:"+ex.getMessage());
		}
		return return_value;
	}
	
	public double getDouble(String path, double default_value){
		double return_value=default_value;
		try{
			return_value=Double.parseDouble(getValue(path));
		}catch(Exception ex){
			error("getInteger: Exception:"+ex.getMessage());
		}
		return return_value;
	}

}