net.cloudkit.enterprises.infrastructure.utilities.JaxbMapperHelper.java Source code

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Here is the source code for net.cloudkit.enterprises.infrastructure.utilities.JaxbMapperHelper.java

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/*
 * Copyright (C) 2015 The Workbench Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package net.cloudkit.enterprises.infrastructure.utilities;

import org.apache.commons.lang3.StringUtils;
import org.apache.commons.lang3.Validate;

import javax.xml.bind.*;
import javax.xml.bind.annotation.XmlAnyElement;
import javax.xml.namespace.QName;
import java.io.StringReader;
import java.io.StringWriter;
import java.util.Collection;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;

/**
 * Jaxb2.0XML<->Java ObjectMapper.
 *
 * ???RootClass.
 * ?RootCollection.
 *
 * @author hongquanli <hongquanli@qq.com>
 * @version 1.0 20131121 ?3:03:21
 */
public class JaxbMapperHelper {

    private static ConcurrentMap<Class<?>, JAXBContext> jaxbContexts = new ConcurrentHashMap<Class<?>, JAXBContext>();

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

    /**
     * Java Object->Xml with encoding.
     */
    public static String toXml(Object root, String encoding) {
        Class<?> clazz = ReflectionHelper.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 ExceptionHelper.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 ExceptionHelper.unchecked(e);
        }
    }

    /**
     * Xml->Java Object.
     */
    @SuppressWarnings("unchecked")
    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) {
            throw ExceptionHelper.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);
            }

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

    /**
     * UnMarshaller. ???pooling
     */
    public static Unmarshaller createUnmarshaller(Class<?> clazz) {
        try {
            JAXBContext jaxbContext = getJaxbContext(clazz);
            return jaxbContext.createUnmarshaller();
        } catch (JAXBException e) {
            throw ExceptionHelper.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);
                jaxbContexts.putIfAbsent(clazz, jaxbContext);
            } catch (JAXBException 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;
    }
}