Java XML String Transform encodeStringIntoMemento(String str)

Description

Returns a XML memento, that encodes a single String parameter

License

Open Source License

Declaration

public static String encodeStringIntoMemento(String str) 

Method Source Code

//package com.java2s;
/*******************************************************************************
 * Copyright (c) 2015 Ericsson and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors://from  w w  w. j a  v a2s. c om
 *     Marc Dumais (Ericsson) - initial API and implementation (bug 460837)
 *******************************************************************************/

import java.io.ByteArrayOutputStream;

import java.util.ArrayList;

import java.util.List;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;

import org.w3c.dom.Document;
import org.w3c.dom.Element;

public class Main {
    protected static final String ROOT_ELEMENT_TAGNAME = "root_element";
    protected static final String ELEMENT_TAGNAME = "elem";
    protected static final String ATTRIBUTE_VALUE = "value";

    /** Returns a XML memento, that encodes a single String parameter */
    public static String encodeStringIntoMemento(String str) {
        List<String> list = new ArrayList<>();
        list.add(str);
        return encodeListIntoMemento(list);
    }

    /** Returns a XML memento, that encodes a List of Strings */
    public static String encodeListIntoMemento(List<String> labels) {
        String returnValue = null;

        DocumentBuilderFactory dfactory = DocumentBuilderFactory
                .newInstance();
        DocumentBuilder docBuilder = null;
        try {
            docBuilder = dfactory.newDocumentBuilder();
            Document doc = docBuilder.newDocument();

            Element rootElement = doc.createElement(ROOT_ELEMENT_TAGNAME);
            doc.appendChild(rootElement);
            // create one XML element per list entry to save
            for (String lbl : labels) {
                Element elem = doc.createElement(ELEMENT_TAGNAME);
                elem.setAttribute(ATTRIBUTE_VALUE, lbl);
                rootElement.appendChild(elem);
            }

            ByteArrayOutputStream s = new ByteArrayOutputStream();

            TransformerFactory factory = TransformerFactory.newInstance();
            Transformer transformer = factory.newTransformer();
            transformer.setOutputProperty(OutputKeys.METHOD, "xml"); //$NON-NLS-1$
            transformer.setOutputProperty(OutputKeys.INDENT, "yes"); //$NON-NLS-1$

            DOMSource source = new DOMSource(doc);
            StreamResult outputTarget = new StreamResult(s);
            transformer.transform(source, outputTarget);

            returnValue = s.toString("UTF8"); //$NON-NLS-1$
        } catch (Exception e) {
            e.printStackTrace();
        }
        return returnValue;
    }
}

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