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 * http://glassfish.java.net/public/CDDL+GPL_1_1.html
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package com.sun.jersey.json.impl;

import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.nio.charset.Charset;

import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBElement;
import javax.xml.bind.JAXBException;
import javax.xml.bind.UnmarshalException;
import javax.xml.bind.Unmarshaller;
import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamReader;

import com.sun.jersey.api.json.JSONConfigurated;
import com.sun.jersey.api.json.JSONConfiguration;
import com.sun.jersey.api.json.JSONUnmarshaller;

/**
 * @author Jakub Podlesak (jakub.podlesak at oracle.com)
 * @author Michal Gajdos (michal.gajdos at oracle.com)
 */
public class BaseJSONUnmarshaller implements JSONUnmarshaller, JSONConfigurated {

    private static final Charset UTF8 = Charset.forName("UTF-8");

    protected final Unmarshaller jaxbUnmarshaller;
    private final JAXBContext jaxbContext;

    protected final JSONConfiguration jsonConfig;


    public BaseJSONUnmarshaller(JAXBContext jaxbContext, JSONConfiguration jsonConfig) throws JAXBException {
        this(jaxbContext.createUnmarshaller(), jaxbContext, jsonConfig);
    }

    public BaseJSONUnmarshaller(Unmarshaller jaxbUnmarshaller, JAXBContext jaxbContext, JSONConfiguration jsonConfig) {
        this.jaxbUnmarshaller = jaxbUnmarshaller;
        this.jaxbContext = jaxbContext;
        this.jsonConfig = jsonConfig;
    }


    // JSONConfigurated

    public JSONConfiguration getJSONConfiguration() {
        return jsonConfig;
    }


    // JSONUnmarshaller

    public  T unmarshalFromJSON(InputStream inputStream, Class expectedType) throws JAXBException {
        return unmarshalFromJSON(new InputStreamReader(inputStream, UTF8), expectedType);
    }

    public  T unmarshalFromJSON(Reader reader, Class expectedType) throws JAXBException {
        if (jsonConfig.isRootUnwrapping() || !expectedType.isAnnotationPresent(XmlRootElement.class)) {
            return unmarshalJAXBElementFromJSON(reader, expectedType).getValue();
        } else {
            return (T) jaxbUnmarshaller.unmarshal(createXmlStreamReader(reader, expectedType));
        }
    }

    public  JAXBElement unmarshalJAXBElementFromJSON(InputStream inputStream, Class declaredType) throws JAXBException {
        return unmarshalJAXBElementFromJSON(new InputStreamReader(inputStream, UTF8), declaredType);
    }

    public  JAXBElement unmarshalJAXBElementFromJSON(Reader reader, Class declaredType) throws JAXBException {
        return jaxbUnmarshaller.unmarshal(createXmlStreamReader(reader, declaredType), declaredType);
    }

    private XMLStreamReader createXmlStreamReader(Reader reader, Class expectedType) throws JAXBException {
        try {
        return Stax2JsonFactory.createReader(reader, jsonConfig,
                jsonConfig.isRootUnwrapping() ? JSONHelper.getRootElementName(expectedType) : null, expectedType, jaxbContext);
        } catch (XMLStreamException ex) {
            throw new UnmarshalException("Error creating JSON-based XMLStreamReader", ex);
        }
    }
}