Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;

import javax.xml.namespace.QName;

import javax.xml.stream.XMLEventReader;

import javax.xml.stream.XMLStreamException;

import javax.xml.stream.events.StartElement;
import javax.xml.stream.events.XMLEvent;

public class Main {
    /**
     * Reads the text content of an element. The reader should be positioned in
     * front of a StartElement event, and will be read up to and including the
     * end element tag.
     * 
     * @param reader The event stream from which to read the element text.
     * @param elemName The optional name of the element being read. If this
     *            paramter is non- <code>null</code> then an exception will
     *            be thrown if the element read doesn't have the same name.
     * @return The text read from the element.
     * @throws XMLStreamException If an error occurs reading the stream, or if
     *             the read element doesn't match the provided QName.
     */
    public static final String readTextElement(XMLEventReader reader, QName elemName) throws XMLStreamException {

        if (elemName != null) {

            requireStartElement(reader, elemName);

        }

        // read text
        String text = reader.getElementText();

        // consume the end tag
        reader.nextEvent();

        return text;

    }

    /**
     * Utility method that throws an exception if the provided reader is not
     * positioned before a StartElement event with the specified tag name.
     * 
     * @param reader The reader to test.
     * @param qname The required name of the start-tag. If <code>null</code>,
     *            any start tag is accepted.
     * @throws XMLStreamException If an error occurs reading from the stream.
     */
    public static final void requireStartElement(XMLEventReader reader, QName qname) throws XMLStreamException {

        if (reader.hasNext()) {

            XMLEvent nextEvent = reader.peek();
            if (nextEvent.isStartElement()) {

                if (qname != null) {

                    StartElement start = nextEvent.asStartElement();
                    QName name = start.getName();
                    if (!name.equals(qname)) {

                        throw new XMLStreamException(
                                "Encountered unexpected element; expected " + qname + ", but found " + name);

                    }

                }

            } else {

                throw new XMLStreamException("Encountered unexpected event; expected " + qname
                        + " start-tag, but found event " + nextEvent);

            }

        } else {

            throw new XMLStreamException("Encountered unexpected end of stream; expected element " + qname);

        }

    }
}