Java XML Parse File parseFile(Class context, String name)

Description

Parse an XHTML file from our CLASSPATH and return the instance.

License

Apache License

Declaration

public static Document parseFile(Class<?> context, String name) throws IOException 

Method Source Code

//package com.java2s;
// Licensed under the Apache License, Version 2.0 (the "License");

import org.w3c.dom.Document;

import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;

import java.io.IOException;
import java.io.InputStream;

import java.nio.file.Files;
import java.nio.file.NoSuchFileException;
import java.nio.file.Path;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;

import javax.xml.xpath.XPathConstants;
import javax.xml.xpath.XPathExpression;
import javax.xml.xpath.XPathExpressionException;
import javax.xml.xpath.XPathFactory;

public class Main {
    /** Parse an XHTML file from our CLASSPATH and return the instance. */
    public static Document parseFile(Class<?> context, String name) throws IOException {
        try (InputStream in = context.getResourceAsStream(name)) {
            if (in == null) {
                return null;
            }/*from   w  w w .  j a va 2s.c  om*/
            Document doc = newBuilder().parse(in);
            compact(doc);
            return doc;
        } catch (SAXException | ParserConfigurationException | IOException e) {
            throw new IOException("Error reading " + name, e);
        }
    }

    /** Parse an XHTML file from the local drive and return the instance. */
    public static Document parseFile(Path path) throws IOException {
        try (InputStream in = Files.newInputStream(path)) {
            Document doc = newBuilder().parse(in);
            compact(doc);
            return doc;
        } catch (NoSuchFileException e) {
            return null;
        } catch (SAXException | ParserConfigurationException | IOException e) {
            throw new IOException("Error reading " + path, e);
        }
    }

    private static DocumentBuilder newBuilder() throws ParserConfigurationException {
        DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
        factory.setValidating(false);
        factory.setExpandEntityReferences(false);
        factory.setIgnoringComments(true);
        factory.setCoalescing(true);
        return factory.newDocumentBuilder();
    }

    private static void compact(Document doc) {
        try {
            String expr = "//text()[normalize-space(.) = '']";
            XPathFactory xp = XPathFactory.newInstance();
            XPathExpression e = xp.newXPath().compile(expr);
            NodeList empty = (NodeList) e.evaluate(doc, XPathConstants.NODESET);
            for (int i = 0; i < empty.getLength(); i++) {
                Node node = empty.item(i);
                node.getParentNode().removeChild(node);
            }
        } catch (XPathExpressionException e) {
            // Don't do the whitespace removal.
        }
    }
}

Related

1. parse(String filename)
2. parse(String xmlFile)
3. parseAIMLFile(File file)
4. parseData(String filename)
5. parseDoc(File xmlFile)
6. parseFile(File file)
7. parseFile(File fn)
8. parseFile(final File aFile)
9. parseFile(String fileName)