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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2010-2011 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * http://glassfish.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
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 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
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 */

package com.sun.jersey.json.impl;

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

/**
 *
 * @author [email protected]
 */
public class BaseJSONUnmarshaller implements JSONUnmarshaller, JSONConfigurated {

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

    protected final Unmarshaller jaxbUnmarshaller;

    protected final JSONConfiguration jsonConfig;


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

    public BaseJSONUnmarshaller(Unmarshaller jaxbUnmarshaller, JSONConfiguration jsonConfig) {
        this.jaxbUnmarshaller = jaxbUnmarshaller;
        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);
        } catch (XMLStreamException ex) {
            throw new UnmarshalException("Error creating JSON-based XMLStreamReader", ex);
        }
    }
}