com.faceye.feature.util.JaxbMapper.java Source code

Introduction

Here is the source code for com.faceye.feature.util.JaxbMapper.java

Source

package com.faceye.feature.util;

/*******************************************************************************
 * Copyright (c) 2005, 2014 springside.github.io
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 *******************************************************************************/

import java.io.StringReader;
import java.io.StringWriter;
import java.util.Collection;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;

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.lang3.StringUtils;
import org.apache.commons.lang3.Validate;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Jaxb2.0XML<->Java ObjectMapper.
 * 
 * ???RootClass.
 * ?RootCollection.
 * 
 * @author calvin
 */
public class JaxbMapper {
    private static Logger logger = LoggerFactory.getLogger(JaxbMapper.class);
    private static ConcurrentMap<Class, JAXBContext> jaxbContexts = new ConcurrentHashMap<Class, JAXBContext>();

    /**
     * Java Object->Xml without encoding.
     */
    public static String toXml(Object root) {
        Class clazz = Reflections.getUserClass(root);
        String xml = toXml(root, clazz, null);
        return xml;
    }

    /**
     * Java Object->Xml with encoding.
     */
    public static String toXml(Object root, String encoding) {
        Class clazz = Reflections.getUserClass(root);
        return toXml(root, clazz, encoding);
    }

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

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

    /**
     * Java Collection->Xml with encoding, ?Root ElementCollection.
     */
    public static String toXml(Collection<?> root, String rootName, Class clazz, 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(clazz, encoding).marshal(wrapperElement, writer);

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

    /**
     * Xml->Java Object.
     */
    public static <T> T fromXml(String xml, Class<T> clazz) {
        try {
            StringReader reader = new StringReader(xml);
            return (T) createUnmarshaller(clazz).unmarshal(reader);
        } catch (JAXBException e) {
            logger.error(">>FaceYe form xml 2 class exception:", e);
            throw Exceptions.unchecked(e);
        }
    }

    /**
     * Marshallerencoding(?null).
     * ???pooling
     */
    public static Marshaller createMarshaller(Class clazz, String encoding) {
        try {
            JAXBContext jaxbContext = getJaxbContext(clazz);

            Marshaller marshaller = jaxbContext.createMarshaller();

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

            if (StringUtils.isNotBlank(encoding)) {
                marshaller.setProperty(Marshaller.JAXB_ENCODING, encoding);
            }
            //         marshaller.setProperty(Marshaller.JAXB_SCHEMA_LOCATION, "");
            //         marshaller.setProperty(Marshaller.JAXB_NO_NAMESPACE_SCHEMA_LOCATION, "");

            //         marshaller.setProperty("com.sun.xml.bind.namespacePrefixMapper", new NamespacePrefixMapper() {
            //                @Override
            //                public String[] getPreDeclaredNamespaceUris() {
            //                    return new String[] { WellKnownNamespace.XML_SCHEMA_INSTANCE };
            //                }
            //
            //                @Override
            //                public String getPreferredPrefix(String namespaceUri, String suggestion, boolean requirePrefix) {
            //                    if (namespaceUri.equals(WellKnownNamespace.XML_SCHEMA_INSTANCE))
            //                        return "xsi";
            //                    if (namespaceUri.equals(WellKnownNamespace.XML_SCHEMA))
            //                        return "xs";
            //                    if (namespaceUri.equals(WellKnownNamespace.XML_MIME_URI))
            //                        return "xmime";
            //                    return suggestion;
            //
            //                }
            //            });

            return marshaller;
        } catch (JAXBException e) {
            logger.error(">>FaceYe form xml 2 class exception:", e);
            throw Exceptions.unchecked(e);
        }
    }

    /**
     * UnMarshaller.
     * ???pooling
     */
    public static Unmarshaller createUnmarshaller(Class clazz) {
        try {
            JAXBContext jaxbContext = getJaxbContext(clazz);
            return jaxbContext.createUnmarshaller();
        } catch (JAXBException e) {
            logger.error(">>FaceYe form xml 2 class exception:", e);
            throw Exceptions.unchecked(e);
        }
    }

    protected static JAXBContext getJaxbContext(Class clazz) {
        Validate.notNull(clazz, "'clazz' must not be null");
        JAXBContext jaxbContext = jaxbContexts.get(clazz);
        if (jaxbContext == null) {
            try {
                jaxbContext = JAXBContext.newInstance(clazz, CollectionWrapper.class);
                //            jaxbContext = JAXBContext.newInstance(clazz, clazz);
                jaxbContexts.putIfAbsent(clazz, jaxbContext);
            } catch (JAXBException ex) {
                logger.error(">>FaceYe form xml 2 class exception:", ex);
                throw new RuntimeException(
                        "Could not instantiate JAXBContext for class [" + clazz + "]: " + ex.getMessage(), ex);
            }
        }
        return jaxbContext;
    }

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

        @XmlAnyElement
        protected Collection<?> collection;
    }
}