com.px100systems.util.XmlParser.java Source code

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Here is the source code for com.px100systems.util.XmlParser.java

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/*
 * This file is part of Px100 Data.
 *
 * Px100 Data is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
    
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see http://www.gnu.org/licenses/
 */
package com.px100systems.util;

import org.apache.commons.io.IOUtils;
import org.apache.commons.io.output.StringBuilderWriter;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Marshaller;
import java.io.ByteArrayInputStream;
import java.io.InputStream;
import java.io.Writer;

/**
 * Simple JAXB-based XML parser
 * 
 * @version 0.3 <br>Copyright (c) 2015 Px100 Systems. All Rights Reserved.<br>
 * @author Alex Rogachevsky
 */
public class XmlParser<T> {
    private JAXBContext jaxb;

    /**
     * XML parser
     * @param xmlClass class to parse into
     */
    public XmlParser(Class<T> xmlClass) {
        try {
            jaxb = JAXBContext.newInstance(xmlClass);
        } catch (JAXBException e) {
            throw new RuntimeException(e);
        }
    }

    /**
     * Parse
     * @param in input
     * @return the parsed class
     */
    @SuppressWarnings("unchecked")
    public T parse(InputStream in) {
        try {
            return (T) jaxb.createUnmarshaller().unmarshal(in);
        } catch (JAXBException e) {
            throw new RuntimeException(e);
        }
    }

    /**
     * Parse
     * @param data input
     * @return the parsed class
     */
    public T parse(byte[] data) {
        InputStream in = null;
        try {
            in = new ByteArrayInputStream(data);
            return parse(in);
        } finally {
            IOUtils.closeQuietly(in);
        }
    }

    /**
     * Serialize the bean to XML
     * @param bean teh bean to serialize
     * @return XML
     */
    public String write(T bean) {
        StringBuilder result = new StringBuilder();
        Writer writer = new StringBuilderWriter(result);
        try {
            Marshaller m = jaxb.createMarshaller();
            m.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, Boolean.TRUE);
            m.setProperty(Marshaller.JAXB_FRAGMENT, Boolean.TRUE);
            m.marshal(bean, writer);
        } catch (Exception e) {
            throw new RuntimeException(e);
        } finally {
            IOUtils.closeQuietly(writer);
        }
        return result.toString();
    }
}