Java JDOM Document getContentSize() Method

The Java JDOM getContentSize() method of Document class retrieves the number of content objects present inside an XML document. This method counts DTD declaration, processing instruction, comments and root element. It doesn't count the child elements and comments inside the root; instead, it counts the entire content of the root element as a single element.

Syntax

Following is the syntax of the Java JDOM Document getContentSize() method −

Document.getContentSize();

Parameters

The Java getContentSize() method doesn't accept any parameters.

Return Value

The Java getContentSize() method returns the number of content objects in the form of an integer.

Example 1

The following basic example creates a document and adds a root element. Using the Java JDOM Document getContentSize() method, we are going to retrieve the number of content objects.

import org.jdom2.Document;
import org.jdom2.Element;

public class GetContentSize {
   public static void main(String args[]) {
      try {	
    	 //Creating a new Document and adding the root
	     Document doc = new Document();
	     Element root = new Element("book");
	     doc.addContent(root);
	     //Get the content size
	     int content_objs = doc.getContentSize();
	     System.out.println("No.of content objects : "+content_objs);      
      } catch (Exception e) {
    	 e.printStackTrace();
      }
   }
}

The output window displays the number of content objects.

No.of content objects : 1

Example 2

The getContentSize() method returns '0' if there is no content available inside the document. The following example illustrates this scenario −

import org.jdom2.Document;

public class GetContentSize {
   public static void main(String args[]) {
      try {	
    	 //Creating a new document
    	 Document doc = new Document();		 
    	 //Get the content size
	     int content_objs = doc.getContentSize();
	     System.out.println("No.of content objects : "+content_objs); 	           
      } catch (Exception e) {
    	 e.printStackTrace();
      }
   }
}

The output window displays number of content objects as '0'.

No.of content objects : 0

Example 3

Let us count the number of content objects inside the following bookstore.xml file.

<?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet type="text/xsl" href="style.xsl"?>
<!DOCTYPE bookstore[

<!ELEMENT bookstore (book+)>
<!ELEMENT book (name,author,price)>
<!ELEMENT name (#PCDATA)>
<!ELEMENT author (#PCDATA)>
<!ELEMENT price (#PCDATA)>
]>
<!-- Information of a Bookstore (last updated 05-08-2024) -->
<!-- All the books in the store are listed -->
<bookstore>
   <book>
      <name>Treasure Island</name>
      <author>Robert Louis</author>
      <price>1400</price>
   </book>
   <book>
      <name>Oliver Twist</name>
      <author>Charles Dickens</author>
      <price>2000</price>
   </book>
   <book>
      <name>War and Peace</name>
      <author>Leo Tolstoy</author>
      <price>1500</price>
   </book>
</bookstore>

The following program reads the above XML file and counts the number of content objects using getContentSize() method.

import java.io.File;
import org.jdom2.Document;
import org.jdom2.input.SAXBuilder;

public class GetContentSize {
   public static void main(String args[]) {
      try {	
    	 //Reading the document
 		 SAXBuilder saxBuilder = new SAXBuilder();
 		 File inputFile = new File("bookstore.xml");
 		 Document doc = saxBuilder.build(inputFile);		 
 		 //Get the content size
	     int content_objs = doc.getContentSize();
	     System.out.println("No.of content objects : "+content_objs); 	           
      } catch (Exception e) {
    	 e.printStackTrace();
      }
   }
}

The program counts 1 processing instruction, 1 DTD declaration, 2 comments and 1 root element and displays the count as 5.

No.of content objects : 5