Headline

Push-based XML parsing in Language:Java with Technology:SAX

Characteristics

XML processing

Illustration

The data model is implemented as xml files (sampleCompany.xml) that conform to a schema (Company.xsd).

Feature:Parsing is implemented by loading a Technology:sax XMLreader:

    // here a handler can realise unparsing (see Cut)
    public static void parse(DefaultHandler handler, String file) throws SAXException, IOException {
        XMLReader xreader = XMLReaderFactory.createXMLReader();
        xreader.setContentHandler(handler);
        xreader.setErrorHandler(handler);
        FileReader reader = new FileReader(file);
        xreader.parse(new InputSource(reader));
    }

Feature:Unparsing can be implemented by a handler (see Cut).

Feature:Total is implemented by a SAX handler that totals during a parse:

    /**
     * Return the final result of query for totaling salaries.
     */
    public double getTotal() { 
        return total; 
    }

Feature:Cut is implemented by a SAX handler that outputs an XML-file with XMLStreamWriter.

The schema is not needed for the basic operations, but one can perform XML validation with regard to the schema (see package org.softlang.company.features.sax)

Test cases are implemented for all Namespace:Features.

Relationships

For DOM-like implementations of in-memory XML processing see Contribution:dom, Contribution:jdom and Contribution:xom.

For a query-based implementation of in-memory XML processing see Contribution:xpathAPI.

For push-based XML processing see Contribution:sax.

For Object/XML mapping see Contribution:jaxbChoice (XSD with choice for different subunits), Contribution:jaxbComposition (XSD with object composition), Contribution:jaxbExtension (XSD with type extension) and Contribution:jaxbSubstitution (XSD with substitution groups).

Architecture

The contribution follows a standardized structure:

  • inputs contains input files for tests
  • src/main/java contains the following packages:
  • src/test/java contains the following packages:

Usage

This contribution uses Technology:Gradle for building. Technology:Eclipse is supported.

See https://github.com/101companies/101simplejava/blob/master/README.md

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