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Thread: XML DOM Parser problem

  1. #1
    Junior Member
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    Apr 2010
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    Default XML DOM Parser problem

    I have written the following java code for an XML Parser :
    import org.w3c.dom.*;
    import javax.xml.parsers.*;
    import java.io.*;
    import javax.xml.transform.*;
    import javax.xml.transform.dom.*;
    import javax.xml.transform.stream.*;
     
    public class XMLParser
    {
    	int i, j;
    	private final static String xmlFileName = "/home/kanishk/Desktop/SE/mini proj/sample.xml";
    	public void XMLSearch()
    	{
    		try{
    		System.out.println("sapsap");
    		File file = new File(xmlFileName);
    		int flag = 0;
    		if (file.exists())
    		{
    			DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
    			DocumentBuilder parser = factory.newDocumentBuilder();
    			Document doc = parser.parse(xmlFileName);
    			BufferedReader bf = new BufferedReader(new InputStreamReader(System.in));
          			System.out.print("Enter search data: ");
          			String str = bf.readLine();
          			NodeList nl = doc.getElementsByTagName("*");
          			for(i=0;i<nl.getLength();i++)
          			{
          				if(nl.item(i).hasChildNodes())
          				{
          					if(nl.item(i).hasAttributes())
          					{
          						NamedNodeMap nnm = nl.item(i).getAttributes();
          						for(j=0;j<nnm.getLength();j++)
          						{
          							Attr a = (Attr)nnm.item(j);
          							if(str.equals(a.getValue()))
          							{
          								System.out.println("Search Data found");
          								flag = 1;
          							}
          						}
          					}
          					Node ch;
          					for(ch=nl.item(i).getFirstChild();ch!=null;ch=ch.getNextSibling())
          					{
          						if(ch.getNodeType()==Node.TEXT_NODE || ch.getNodeType()==Node.ATTRIBUTE_NODE)
          						{
          							if(ch.getNodeType()==Node.TEXT_NODE)
          							{
          								if(str.equals(ch.getNodeValue()))
          								{
          									System.out.println("Search Data found");
          									flag = 1;
          								}
          							}
          						}
          					}
          				}
          			}
          			if(flag==0)
          				System.out.println("Data Not Found");
          		}
          		else
          			System.out.println("File doesnt exist");
          		}
          		catch(Exception e){
          		System.out.println(e);}
          	}
          	public void XMLModify(int k)
          	{
          		try{
          		File file = new File(xmlFileName);
          		if (file.exists())
    		{
    			if(k==1)
    			{
    				DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
    				DocumentBuilder parser = factory.newDocumentBuilder();
    				Document doc = parser.parse(xmlFileName);
    				BufferedReader bf = new BufferedReader(new InputStreamReader(System.in));
          				System.out.println("Enter parent node: ");
          				String str = bf.readLine();
          				BufferedReader bf1 = new BufferedReader(new InputStreamReader(System.in));
          				System.out.println("Enter element name: ");
          				String str1 = bf1.readLine();
          				bf1 = new BufferedReader(new InputStreamReader(System.in));
          				System.out.println("Give an element value(yes or no)?: ");
          				String str2 = bf1.readLine();
          				Node n1 = doc.createElement(str1);
          				NodeList nl = doc.getElementsByTagName(str);
          				for(j=0;j<nl.getLength();j++)
          				{
          					nl.item(j).appendChild(n1);
          					if(str2.equals("yes"))
          					{
          						bf1 = new BufferedReader(new InputStreamReader(System.in));
          						System.out.println("Enter element value: ");
          						String str3 = bf1.readLine();
          						Text txt = doc.createTextNode(str3);
          						n1.appendChild(txt);
          					}
          				}
          				storedata(doc);
          			}
          			if(k==2)
          			{
          				DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
    				DocumentBuilder parser = factory.newDocumentBuilder();
    				Document doc = parser.parse(xmlFileName);
          				BufferedReader bf = new BufferedReader(new InputStreamReader(System.in));
          				System.out.println("Enter attribute node: ");
          				String str = bf.readLine();
          				BufferedReader bf2 = new BufferedReader(new InputStreamReader(System.in));
          				System.out.println("Enter attribute value: ");
          				String str2 = bf2.readLine();
          				BufferedReader bf1 = new BufferedReader(new InputStreamReader(System.in));
          				System.out.print("Enter element name to which attribute should be added: ");
          				String str1 = bf1.readLine();
          				NodeList nl = doc.getElementsByTagName(str1);
          				for(j=0;j<nl.getLength();j++)
          				{
          					Element e = (Element)nl.item(j);
          					e.setAttribute(str,str2);
          				}
          				storedata(doc);
          			}
          			if(k==3)
          			{
          				Node n;
          				DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
    				DocumentBuilder parser = factory.newDocumentBuilder();
    				Document doc = parser.parse(xmlFileName);
          				BufferedReader bf = new BufferedReader(new InputStreamReader(System.in));
          				System.out.println("Enter element to be replaced: ");
          				String str = bf.readLine();
          				BufferedReader bf1 = new BufferedReader(new InputStreamReader(System.in));
          				System.out.print("Enter new element: ");
          				String str1 = bf1.readLine();
          				bf1 = new BufferedReader(new InputStreamReader(System.in));
          				System.out.println("Give an element value(yes or no)?: ");
          				String str2 = bf1.readLine();
          				n = doc.createElement(str1);
          				//Element e = doc.createElement(str);
          				NodeList nl = doc.getElementsByTagName(str);
          				for(j=0;j<nl.getLength();j++)
          				{
          					Node n1 = nl.item(j).getParentNode();
          					n1.removeChild(nl.item(j));
          					Node n2 = n1.appendChild(n);
          					if(str2.equals("yes"))
          					{
          						bf1 = new BufferedReader(new InputStreamReader(System.in));
          						System.out.println("Enter element value: ");
          						String str3 = bf1.readLine();
          						Text txt = doc.createTextNode(str3);
          						n2.appendChild(txt);
          					}
     
          				}
          				storedata(doc);
          			}
          			if(k==4)
          			{
          				DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
    				DocumentBuilder parser = factory.newDocumentBuilder();
    				Document doc = parser.parse(xmlFileName);
          				BufferedReader bf = new BufferedReader(new InputStreamReader(System.in));
          				System.out.println("Enter attribute to be replaced: ");
          				String str = bf.readLine();
          				BufferedReader bf1 = new BufferedReader(new InputStreamReader(System.in));
          				System.out.print("Enter new attribute: ");
          				String str1 = bf1.readLine();
          				BufferedReader bf2 = new BufferedReader(new InputStreamReader(System.in));
          				System.out.print("Enter new attribute value: ");
          				String str2 = bf2.readLine();
          				NodeList nl = doc.getElementsByTagName("*");
          				for(j=0;j<nl.getLength();j++)
          				{
          					Element e = (Element)nl.item(j);
          					if(e.hasAttribute(str))
          					{
          						e.removeAttribute(str);
          						e.setAttribute(str1,str2);
          					}
          				}
          				storedata(doc);
          			}
          			if(k==5)
          			{
          				Node n;
          				DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
    				DocumentBuilder parser = factory.newDocumentBuilder();
    				Document doc = parser.parse(xmlFileName);
          				BufferedReader bf = new BufferedReader(new InputStreamReader(System.in));
          				System.out.println("Enter element to be removed: ");
          				String str = bf.readLine();
          				NodeList nl = doc.getElementsByTagName(str);
          				for(j=0;j<nl.getLength();j++)
          				{
          					n = nl.item(j).getParentNode();
          					if(n!=null)
          						n.removeChild(nl.item(j));
          					else
          						System.out.println("Element not present in file");
          				}
          				storedata(doc);
          			}
          			if(k==6)
          			{
          				DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
    				DocumentBuilder parser = factory.newDocumentBuilder();
    				Document doc = parser.parse(xmlFileName);
          				BufferedReader bf = new BufferedReader(new InputStreamReader(System.in));
          				System.out.println("Enter attribute to be removed: ");
          				String str = bf.readLine();
          				NodeList nl = doc.getElementsByTagName("*");
          				for(j=0;j<nl.getLength();j++)
          				{
          					Element e = (Element)nl.item(j);
          					if(e.hasAttribute(str))
          						e.removeAttribute(str);
          				}
          				storedata(doc);
          			}
          			if(k==7)
          			{
          				DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
    				DocumentBuilder parser = factory.newDocumentBuilder();
    				Document doc = parser.parse(xmlFileName);
          				BufferedReader bf = new BufferedReader(new InputStreamReader(System.in));
          				System.out.println("Enter element whose value is to be updated: ");
          				String str = bf.readLine();
          				BufferedReader bf1 = new BufferedReader(new InputStreamReader(System.in));
          				System.out.print("Enter new value: ");
          				String str1 = bf1.readLine();
          				NodeList nl = doc.getElementsByTagName(str);
          				for(j=0;j<nl.getLength();j++)
          				{
          					if(nl.item(j).hasChildNodes())
          					{
          						NodeList nl1 = nl.item(j).getChildNodes();
          						for(i=0;i<nl1.getLength();i++)
          						{
          							if(nl1.item(i).getNodeType()==Node.TEXT_NODE);
          								nl1.item(i).setNodeValue(str1);
          						}
          					}
          					else
          						System.out.println("Element has no value");
          				}
          				storedata(doc);
          			}
          			if(k==8)
          			{
          				DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
    				DocumentBuilder parser = factory.newDocumentBuilder();
    				Document doc = parser.parse(xmlFileName);
          				BufferedReader bf = new BufferedReader(new InputStreamReader(System.in));
          				System.out.println("Enter attribute whose value is to be updated: ");
          				String str = bf.readLine();
          				BufferedReader bf1 = new BufferedReader(new InputStreamReader(System.in));
          				System.out.print("Enter new value: ");
          				String str1 = bf1.readLine();
          				NodeList nl = doc.getElementsByTagName("*");
          				for(j=0;j<nl.getLength();j++)
          				{
          					Element e = (Element)nl.item(j);
          					if(e.hasAttribute(str))
          					{
          						e.removeAttribute(str);
          						e.setAttribute(str,str1);
          					}
          				}
          				storedata(doc);
          			}
          		}
          		}
          		catch(Exception e){
          		System.out.println(e);}
          	}
          	private String nodevalue(Node n)
          	{
            	Node ch;
            	if(n!=null)
            	{
                 		if (n.hasChildNodes())
                 		{
                     		for(ch = n.getFirstChild();ch != null;ch = ch.getNextSibling())
                     		{
                         			if(ch.getNodeType() == Node.TEXT_NODE)
                             			return ch.getNodeValue();
                     		}
                 		}
             	}
             	return "";
         	}
          	public void XMLDisplay(Node n,int in)
          	{
          		File file = new File(xmlFileName);
          		if (file.exists())
          		{
            		String nn = n.getNodeName();
            		String str = nodevalue(n);
             		NamedNodeMap nnm = n.getAttributes();
             		System.out.println(indentspc(in) + "NodeName: " + nn + ", NodeValue: " + str);
             		if(nnm!=null)
             		{
             			for (int i = 0; i < nnm.getLength(); i++)
             			{
                    			Node n1 = nnm.item(i);
                  				System.out.println(indentspc(in + 2) + "AttributeName: " + n1.getNodeName() + ", attributeValue: " + n1.getNodeValue());
             			}
             		}
             		if(n.hasChildNodes())
             		{
             			NodeList ch = n.getChildNodes();
             			for (int i = 0; i < ch.getLength(); i++)
             			{
                 				Node ch1 = ch.item(i);
                 				if (ch1.getNodeType() == Node.ELEMENT_NODE)
                    		 		XMLDisplay(ch1,in + 2);
             			}
             		}
         		}
         		else
         			System.out.println("File doesnt exist");
         	}
         	private String indentspc(int in)
         	{
            	StringBuffer buffer = new StringBuffer();
             	for (int i = 0; i < in; i++)
                 		buffer.append(" ");
             	return buffer.toString();
         	}
         	private void storedata(Document doc)
         	{
         		try{
         		TransformerFactory trans = TransformerFactory.newInstance();
    		Transformer t = trans.newTransformer();
            	//StringWriter sw = new StringWriter();
            	//StreamResult r = new StreamResult(sw);
            	Node n = doc.getDocumentElement();
            	Source src = new DOMSource(n); 
            	Result dest = new StreamResult(System.out);
            	t.transform(src, dest);
            	/*DOMSource s = new DOMSource(doc);
            	t.transform(s,r);
            	String str = sw.toString();
            	OutputStream f;
    		byte buf[] = str.getBytes();
    		f = new FileOutputStream("connections.xml");
    		for(int i=0;i<buf.length;i++)
    	   		f.write(buf[i]);
    		f.close();
    		buf = null;*/
    		}
         		catch(Exception e){
          		System.out.println(e);}
    	}
         	public XMLParser()
         	{
         		try{
         		int x;
         		System.out.println("1. Search for data in XML file");
         		System.out.println("2. Modify data in XML file");
         		System.out.println("3. Display contents of XML file");
         		BufferedReader bf = new BufferedReader(new InputStreamReader(System.in));
         		System.out.print("Choose one of the three possibilities(1, 2, 3) : ");
          		x = Integer.parseInt(bf.readLine());
          		if(x==1)
          			XMLSearch();
          		if(x==2)
          		{
          			int y;
          			System.out.println("1. Add Element");
          			System.out.println("2. Add Attribute");
          			System.out.println("3. Replace Element");
          			System.out.println("4. Replace Attribute");
          			System.out.println("5. Remove Element");
          			System.out.println("6. Remove Attribute");
          			System.out.println("7. Modify Element Value(If value present)");
          			System.out.println("8. Modify Attribute Value");
          			bf = new BufferedReader(new InputStreamReader(System.in));
          			System.out.println("Choose one of the given modification possibilities(1, 2, 3, 4, 5, 6, 7, 8) : ");
          			y = Integer.parseInt(bf.readLine());
          			switch(y)
          			{
          				case 1: XMLModify(1);break;
          				case 2: XMLModify(2);break;
          				case 3: XMLModify(3);break;
          				case 4: XMLModify(4);break;
          				case 5: XMLModify(5);break;
          				case 6: XMLModify(6);break;
          				case 7: XMLModify(7);break;
          				case 8: XMLModify(8);break;
          				default: System.out.println("Invalid Selection");break;
          			}
          		}
          		if(x==3)
          		{
          			DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
    			DocumentBuilder parser = factory.newDocumentBuilder();
    			Document doc = parser.parse(xmlFileName);
          			Node root = doc.getDocumentElement();
          			XMLDisplay(root,0);
          		}
          		}
          		catch(Exception e){
          		System.out.println("sasasaas123");
          		System.out.println(e);}
          	}
          	public static void main(String args[])
          	{
          		new XMLParser();
          	}
    }



    and iam parsing the following xml file :
    <?xml version="1.0"?>
    <catalog>
       <product description="Cardigan Sweater" product_image="cardigan.jpg">
          <catalog_item gender="Men's">
             <item_number>QWZ5671</item_number>
             <price>39.95</price>
             <size description="Medium">
                <color_swatch image="red_cardigan.jpg">Red</color_swatch>
                <color_swatch image="burgundy_cardigan.jpg">Burgundy</color_swatch>
             </size>
             <size description="Large">
                <color_swatch image="red_cardigan.jpg">Red</color_swatch>
                <color_swatch image="burgundy_cardigan.jpg">Burgundy</color_swatch>
             </size>
          </catalog_item>
          <catalog_item gender="Women's">
             <item_number>RRX9856</item_number>
             <price>42.50</price>
             <size description="Small">
                <color_swatch image="red_cardigan.jpg">Red</color_swatch>
                <color_swatch image="navy_cardigan.jpg">Navy</color_swatch>
                <color_swatch image="burgundy_cardigan.jpg">Burgundy</color_swatch>
             </size>
             <size description="Medium">
                <color_swatch image="red_cardigan.jpg">Red</color_swatch>
                <color_swatch image="navy_cardigan.jpg">Navy</color_swatch>
                <color_swatch image="burgundy_cardigan.jpg">Burgundy</color_swatch>
                <color_swatch image="black_cardigan.jpg">Black</color_swatch>
             </size>
             <size description="Large">
                <color_swatch image="navy_cardigan.jpg">Navy</color_swatch>
                <color_swatch image="black_cardigan.jpg">Black</color_swatch>
             </size>
             <size description="Extra Large">
                <color_swatch image="burgundy_cardigan.jpg">Burgundy</color_swatch>
                <color_swatch image="black_cardigan.jpg">Black</color_swatch>
             </size>
          </catalog_item>
       </product>
    </catalog>



    and when iam trying to modify the file(by adding the element color_divide with the value yes and parent node as color_swatch) iam getting the following file as output :
    <?xml version="1.0"?>
    <catalog>
       <product description="Cardigan Sweater" product_image="cardigan.jpg">
          <catalog_item gender="Men&apos;s">
             <item_number>QWZ5671</item_number>
             <price>39.95</price>
             <size description="Medium">
                <color_swatch image="red_cardigan.jpg">Red</color_swatch>
                <color_swatch image="burgundy_cardigan.jpg">Burgundy</color_swatch>
             </size>
             <size description="Large">
                <color_swatch image="red_cardigan.jpg">Red</color_swatch>
                <color_swatch image="burgundy_cardigan.jpg">Burgundy</color_swatch>
             </size>
          </catalog_item>
          <catalog_item gender="Women&apos;s">
             <item_number>RRX9856</item_number>
             <price>42.50</price>
             <size description="Small">
                <color_swatch image="red_cardigan.jpg">Red</color_swatch>
                <color_swatch image="navy_cardigan.jpg">Navy</color_swatch>
                <color_swatch image="burgundy_cardigan.jpg">Burgundy</color_swatch>
             </size>
             <size description="Medium">
                <color_swatch image="red_cardigan.jpg">Red</color_swatch>
                <color_swatch image="navy_cardigan.jpg">Navy</color_swatch>
                <color_swatch image="burgundy_cardigan.jpg">Burgundy</color_swatch>
                <color_swatch image="black_cardigan.jpg">Black</color_swatch>
             </size>
             <size description="Large">
                <color_swatch image="navy_cardigan.jpg">Navy</color_swatch>
                <color_swatch image="black_cardigan.jpg">Black</color_swatch>
             </size>
             <size description="Extra Large">
                <color_swatch image="burgundy_cardigan.jpg">Burgundy</color_swatch>
                <color_swatch image="black_cardigan.jpg">Black<color_divide>yesyesyesyesyesyesyesyesyesyesyesyesyesyes</color_divide></color_swatch>
             </size>
          </catalog_item>
       </product>
    </catalog>



    please help me out here.........i want color_divide to be added to each instance of color_swatch ........not only to the last one.........and with only 1 yes as the value each time.......
    Last edited by Json; April 13th, 2010 at 06:35 AM. Reason: Please use code tags.


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