com.framework.infrastructure.mapper.JaxbMapper.java Source code

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Here is the source code for com.framework.infrastructure.mapper.JaxbMapper.java

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/**
 * Copyright (c) 2005-2012 springside.org.cn
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 */
package com.framework.infrastructure.mapper;

import java.io.StringReader;
import java.io.StringWriter;
import java.util.Collection;

import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBElement;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Marshaller;
import javax.xml.bind.Unmarshaller;
import javax.xml.bind.annotation.XmlAnyElement;
import javax.xml.namespace.QName;

import org.apache.commons.lang.StringUtils;

import com.framework.infrastructure.utils.Exceptions;

/**
 * Jaxb2.0XML<->Java ObjectMapper.
 * 
 * RootClass.
 * RootCollection.
 * 
 * @author calvin
 */
public class JaxbMapper {
    //Context.
    private JAXBContext jaxbContext;

    /**
     * @param rootTypes RootClass.
     */
    public JaxbMapper(Class<?>... rootTypes) {
        try {
            jaxbContext = JAXBContext.newInstance(rootTypes);
        } catch (JAXBException e) {
            Exceptions.unchecked(e);
        }
    }

    /**
     * Java Object->Xml without encoding.
     */
    public String toXml(Object root) {
        return toXml(root, null);
    }

    /**
     * Java Object->Xml with encoding.
     */
    public String toXml(Object root, String encoding) {
        try {
            StringWriter writer = new StringWriter();
            createMarshaller(encoding).marshal(root, writer);
            return writer.toString();
        } catch (JAXBException e) {
            throw Exceptions.unchecked(e);
        }
    }

    /**
     * Java Collection->Xml without encoding, Root ElementCollection.
     */
    public String toXml(Collection<?> root, String rootName) {
        return toXml(root, rootName, null);
    }

    /**
     * Java Collection->Xml with encoding, Root ElementCollection.
     */
    public String toXml(Collection<?> root, String rootName, String encoding) {
        try {
            CollectionWrapper wrapper = new CollectionWrapper();
            wrapper.collection = root;

            JAXBElement<CollectionWrapper> wrapperElement = new JAXBElement<CollectionWrapper>(new QName(rootName),
                    CollectionWrapper.class, wrapper);

            StringWriter writer = new StringWriter();
            createMarshaller(encoding).marshal(wrapperElement, writer);

            return writer.toString();
        } catch (JAXBException e) {
            throw Exceptions.unchecked(e);
        }
    }

    /**
     * Xml->Java Object.
     */
    public <T> T fromXml(String xml) {
        try {
            StringReader reader = new StringReader(xml);
            return (T) createUnmarshaller().unmarshal(reader);
        } catch (JAXBException e) {
            throw Exceptions.unchecked(e);
        }
    }

    /**
     * Marshallerencoding(null).
     * pooling
     */
    public Marshaller createMarshaller(String encoding) {
        try {
            Marshaller marshaller = jaxbContext.createMarshaller();

            marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, Boolean.TRUE);

            if (StringUtils.isNotBlank(encoding)) {
                marshaller.setProperty(Marshaller.JAXB_ENCODING, encoding);
            }

            return marshaller;
        } catch (JAXBException e) {
            throw Exceptions.unchecked(e);
        }
    }

    /**
     * UnMarshaller.
     * pooling
     */
    public Unmarshaller createUnmarshaller() {
        try {
            return jaxbContext.createUnmarshaller();
        } catch (JAXBException e) {
            throw Exceptions.unchecked(e);
        }
    }

    /**
     * Root Element  Collection.
     */
    public static class CollectionWrapper {

        @XmlAnyElement
        protected Collection<?> collection;
    }
}