Java XML Parse File parse(File file)

Description

parse

License

Open Source License

Declaration

public static Document parse(File file) 

Method Source Code

//package com.java2s;
//License from project: Open Source License 

import org.w3c.dom.Document;

import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;

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

import java.io.Reader;
import java.io.StringReader;

import java.lang.ref.SoftReference;

public class Main {
    private static SoftReference<DocumentBuilderFactory> DOCUMENT_BUILDER_FACTORY = new SoftReference<>(null);

    public static Document parse(File file) {
        if (file == null)
            throw new IllegalArgumentException("Must provide non-null XML input to parse!");

        try {/*from   www  . ja  v  a2  s.c  om*/
            final Document document;

            DocumentBuilder documentBuilder = createDocumentBuilder();
            document = documentBuilder.parse(file);

            return document;
        } catch (SAXException e) {
            throw new RuntimeException("Error parsing xml: " + e.getMessage(), e);
        } catch (IOException e) {
            throw new RuntimeException("Error parsing xml: " + e.getMessage(), e);
        }
    }

    public static Document parse(String xml) {
        if (xml == null)
            throw new IllegalArgumentException("Must provide non-null XML input to parse!");

        return parse(new StringReader(xml));
    }

    public static Document parse(InputStream xml) {
        if (xml == null)
            throw new IllegalArgumentException("Must provide non-null XML input to parse!");

        return parse(new InputSource(xml));
    }

    public static Document parse(Reader xml) {
        if (xml == null)
            throw new IllegalArgumentException("Must provide non-null XML input to parse!");

        return parse(new InputSource(xml));
    }

    public static Document parse(InputSource src) {
        if (src == null)
            throw new IllegalArgumentException("Must provide non-null XML input to parse!");

        DocumentBuilder documentBuilder = createDocumentBuilder();
        try {
            return documentBuilder.parse(src);
        } catch (SAXException e) {
            throw new RuntimeException("Error parsing xml: " + e.getMessage(), e);
        } catch (IOException e) {
            throw new RuntimeException("Error parsing xml: " + e.getMessage(), e);
        }
    }

    /**
     * Create a new (namespace-aware) DocumentBuilder
     *
     * @return
     */
    public static DocumentBuilder createDocumentBuilder() {
        try {
            DocumentBuilderFactory factory = DOCUMENT_BUILDER_FACTORY.get();

            if (factory == null) {
                factory = createDocumentBuilderFactory();

                DOCUMENT_BUILDER_FACTORY = new SoftReference<>(factory);
            }

            return factory.newDocumentBuilder();
        } catch (ParserConfigurationException e) {
            throw new RuntimeException("Error creating DocumentBuilder: " + e.getMessage(), e);
        }
    }

    private static DocumentBuilderFactory createDocumentBuilderFactory() {
        DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();

        factory.setNamespaceAware(true);

        return factory;
    }
}

Related

1. parse(File file)
2. parse(File file)
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6. parse(File file)
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8. parse(File input)
9. parse(File xml, ErrorHandler errorHandler)