nl.clockwork.common.util.XMLMessageBuilder.java Source code

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Here is the source code for nl.clockwork.common.util.XMLMessageBuilder.java

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/*******************************************************************************
 * Copyright 2011 Clockwork
 * 
 * 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 nl.clockwork.common.util;

import java.io.ByteArrayInputStream;
import java.io.InputStream;
import java.io.StringWriter;
import java.util.HashMap;

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 org.apache.commons.lang.StringUtils;
import org.w3c.dom.Node;

public class XMLMessageBuilder<T> {
    private static HashMap<Class<?>, XMLMessageBuilder<?>> xmlHandlers = new HashMap<Class<?>, XMLMessageBuilder<?>>();

    private JAXBContext context;

    private XMLMessageBuilder(JAXBContext context) {
        this.context = context;
    }

    public T handle(String xml) throws JAXBException {
        if (StringUtils.isEmpty(xml))
            return null;
        return handle(new ByteArrayInputStream(xml.getBytes()));
    }

    @SuppressWarnings("unchecked")
    public T handle(InputStream is) throws JAXBException {
        if (is == null)
            return null;
        Unmarshaller unmarshaller = context.createUnmarshaller();
        Object o = unmarshaller.unmarshal(is);
        if (o instanceof JAXBElement<?>)
            return (T) ((JAXBElement<T>) o).getValue();
        else
            return (T) o;
    }

    @SuppressWarnings("unchecked")
    public T handle(Node n) throws JAXBException {
        if (n == null)
            return null;
        Unmarshaller unmarshaller = context.createUnmarshaller();
        Object o = unmarshaller.unmarshal(n);
        if (o instanceof JAXBElement<?>)
            return (T) ((JAXBElement<T>) o).getValue();
        else
            return (T) o;
    }

    public String handle(JAXBElement<T> e) throws JAXBException {
        if (e == null)
            return null;
        StringWriter result = new StringWriter();
        Marshaller marshaller = context.createMarshaller();
        marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, Boolean.TRUE);
        marshaller.marshal(e, result);
        result.flush();
        return result.toString();
    }

    public String handle(T object) throws JAXBException {
        if (object == null)
            return null;
        StringWriter result = new StringWriter();
        Marshaller marshaller = context.createMarshaller();
        marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, Boolean.TRUE);
        marshaller.marshal(object, result);
        result.flush();
        return result.toString();
    }

    @SuppressWarnings("unchecked")
    public static <L> XMLMessageBuilder<L> getInstance(Class<L> clazz) throws JAXBException {
        if (xmlHandlers.get(clazz) == null) {
            JAXBContext context = JAXBContext.newInstance(clazz.getPackage().getName());
            xmlHandlers.put(clazz, new XMLMessageBuilder<L>(context));
        }
        return (XMLMessageBuilder<L>) xmlHandlers.get(clazz);
    }
}