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Parse Context Class in Java

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  • Last Updated : 17 Mar, 2022

ParseContext class is a component of the Java packages org.apache.tika.parser, which is used to parse context and pass it on to the Tika (The Apache Tika toolkit detecting and extracts the metadata and the text from over a thousand different file types) parsers org.apache.tika.parser.ParseContext implements a Serializable interface.

The parser’s context is yet another concept. An instance(object) of the Parse context class is created before a non-terminal starting the parsing and is destructed after parsing has concluded

The context is provided for extensibility. it has the main purpose is to expose the start and end of the non-terminal’s parse member function to accommodate external hooks. We can extend the non-terminal in a multitude of ways by writing specialized context classes, without modifying the class itself. For example, we can make the non-terminal emitting debug diagnostics information by writing for a context class that prints out the current state of the scanner at each point in the parse traversal where the non-terminal is invoked by it.

Class ParseContext- org.apache.tika.parser
All Implemented Interfaces:  Serializable
Class ParseContext -java.lang.Object org.apache.tika.parser.ParseContext

The Parse context Use pass context information to Tika parsers

Syntax:

public class ParseContext extends Object implements Serializable

Constructor of Parse Context Class

1. ParseContext(): The Constructor ParseContext() initializes a new instance of The ParseContext class. For example:

ParseContext ab = new ParseContext()

Note: ab is the new instance of the ParseContext Class

Methods of Parse Context Class

Method Description
 get(Class<T> key) Returning the object in this context that implements the given interface
 getDocumentBuilder()  Returning the DOM builder specified in this parsing context
 getSAXParser() Returning the SAX parser specified in this parsing context
getSAXParserFactory() Returning the SAX parser factory specified in this parsing context
getTransformer() Returning the transformer specified in this parsing context
getXMLInputFactory() Returning the StAX input factory specified in this parsing context
getXMLReader() Returning the XMLReader specified in this parsing context
 set(Class<T> key, T value) Adding the given value to context as an implementation of the given interfaces
get(Class<T> key, T defaultValue) Returning the objects in this context that implementing the given interface, or the given default value if such an object it is not found

Example:

Java




// Java Program To Getting Content of Document
// Using Tika Toolkit and ContextParser
 
// Importing required classes
import java.io.*;
import java.io.File.*;
import org.apache.tika.exception.TikaException;
import org.apache.tika.metadata.Metadata;
import org.apache.tika.parser.ParseContext;
import org.apache.tika.parser.txt.TXTParser;
import org.apache.tika.sax.BodyContentHandler;
// Importing necessary Tika packages to it
import org.xml.sax.SAXException;
 
// Main class
class Cowin {
 
    // Main driver method
    public static void main(String[] args)
    {
 
        // Creating a File
        File fileName = new File("abc.txt");
 
        // Instance of File created using new keyword
        FileInputStream fileInputStream
            = new FileInputStream(fileName);
 
        ParseContext parseContext = new ParseContext();
        // new instance of parseContext class is created
 
        MetaData metaData = new MetaData();
 
        // Instance of MetaData is created
        TXTParser textParser = new TXTParser();
 
        // Instance of BodyContentHandler is created for it
        BodyContentHandler bodyContentHandler
            = new BodyContentHandler();
 
        // TXTParser parse method is called for parsing to
        // it
        textParser.parse(fileInputStream,
                         bodyContentHandler, metaData,
                         parseContext);
 
        System.out.println("Contents in the File="
                           + bodyContenthandler.toString());
    }
}


 

 

Output:

 

Contents in the File= Cowin is the webportal for Vaccination

 

The abc.txt file contains the following data-

 

 


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