Example usage for com.google.common.io CharSource toString

Introduction

In this page you can find the example usage for com.google.common.io CharSource toString.

Prototype

public String toString() 

Source Link

Document

Returns a string representation of the object.

Usage

From source file:org.onlab.util.XmlString.java

private String prettyPrintXml(CharSource inputXml) {
    try {//from w  w  w . j av a 2  s. co m
        Document document;
        boolean wasFragment = false;

        DocumentBuilder docBuilder = DocumentBuilderFactory.newInstance().newDocumentBuilder();
        // do not print error to stderr
        docBuilder.setErrorHandler(new DefaultHandler());

        try {
            document = docBuilder.parse(new InputSource(inputXml.openStream()));
        } catch (SAXException e) {
            log.debug("will retry assuming input is XML fragment", e);
            // attempt to parse XML fragments, adding virtual root
            try {
                document = docBuilder.parse(new InputSource(
                        CharSource.concat(CharSource.wrap("<vroot>"), inputXml, CharSource.wrap("</vroot>"))
                                .openStream()));
                wasFragment = true;
            } catch (SAXException e1) {
                log.debug("SAXException after retry", e1);
                // Probably wasn't fragment issue, throwing original
                throw e;
            }
        }

        document.normalize();

        XPath xPath = XPathFactory.newInstance().newXPath();
        NodeList nodeList = (NodeList) xPath.evaluate("//text()[normalize-space()='']", document,
                XPathConstants.NODESET);

        for (int i = 0; i < nodeList.getLength(); ++i) {
            Node node = nodeList.item(i);
            node.getParentNode().removeChild(node);
        }

        // Setup pretty print options
        Transformer t = TransformerFactory.newInstance().newTransformer();
        t.setOutputProperty(OutputKeys.ENCODING, "UTF-8");
        t.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "yes");
        t.setOutputProperty(OutputKeys.INDENT, "yes");
        t.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "2");

        // Return pretty print xml string
        StringWriter strWriter = new StringWriter();
        if (wasFragment) {
            // print everything but virtual root node added
            NodeList children = document.getDocumentElement().getChildNodes();
            for (int i = 0; i < children.getLength(); ++i) {
                t.transform(new DOMSource(children.item(i)), new StreamResult(strWriter));
            }
        } else {
            t.transform(new DOMSource(document), new StreamResult(strWriter));
        }
        return strWriter.toString();
    } catch (Exception e) {
        log.warn("Pretty printing failed", e);
        try {
            String rawInput = inputXml.read();
            log.debug("  failed input: \n{}", rawInput);
            return rawInput;
        } catch (IOException e1) {
            log.error("Failed to read from input", e1);
            return inputXml.toString();
        }
    }
}

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