# JsonXMLMapper.java

    /*
     * Copyright 2011, 2012 Odysseus Software GmbH
     *
     * 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 org.apache.synapse.commons.staxon.core.json.jaxb;

    import java.io.InputStream;
    import java.io.InputStreamReader;
    import java.io.OutputStream;
    import java.io.OutputStreamWriter;
    import java.io.Reader;
    import java.io.Writer;
    import java.nio.charset.Charset;
    import java.util.Collection;
    import java.util.List;

    import javax.xml.bind.JAXBContext;
    import javax.xml.bind.JAXBException;
    import javax.xml.stream.XMLStreamException;

    /**
     * Read/write instances of JAXB-annotated classes from/to JSON.
     */
    public class JsonXMLMapper<T> {
        private static final JsonXML getConfig(Class<?> type) throws JAXBException {
            @JsonXML
            class Default {
            }
            JsonXML config = type.getAnnotation(JsonXML.class);
            if (config == null) {
                config = Default.class.getAnnotation(JsonXML.class);
            }
            return config;
        }

        private static final Charset UTF_8 = Charset.forName("UTF-8");

        private final Class<T> type;
        private final JsonXML config;
        private final JsonXMLBinder binder;
        private final JAXBContext context;

        public JsonXMLMapper(Class<T> type) throws JAXBException {
            this(type, getConfig(type));
        }

        public JsonXMLMapper(Class<T> type, JsonXML config) throws JAXBException {
            this.type = type;
            this.config = config;
            this.binder = createBinder(config);
            this.context = createContext(config);
        }

        protected JsonXMLBinder createBinder(JsonXML config) {
            return new JsonXMLBinder(new JsonXMLRootProvider(), true);
        }

        protected JAXBContext createContext(JsonXML config) throws JAXBException {
            return JAXBContext.newInstance(type);
        }

        public T readObject(Reader reader) throws JAXBException, XMLStreamException {
            return binder.readObject(type, config, context, reader);
        }

        public T readObject(InputStream input) throws JAXBException, XMLStreamException {
            return readObject(new InputStreamReader(input, UTF_8));
        }

        public void writeObject(Writer writer, T value) throws JAXBException, XMLStreamException {
            binder.writeObject(type, config, context, writer, value);
        }

        public void writeObject(OutputStream output, T value) throws JAXBException, XMLStreamException {
            writeObject(new OutputStreamWriter(output, UTF_8), value);
        }

        public List<T> readArray(Reader reader) throws JAXBException, XMLStreamException {
            return binder.readArray(type, config, context, reader);
        }

        public List<T> readArray(InputStream input) throws JAXBException, XMLStreamException {
            return readArray(new InputStreamReader(input, UTF_8));
        }

        public void writeArray(Writer writer, Collection<T> collection) throws JAXBException, XMLStreamException {
            binder.writeArray(type, config, context, writer, collection);
        }

        public void writeArray(OutputStream output, Collection<T> collection) throws JAXBException, XMLStreamException {
            writeArray(new OutputStreamWriter(output, UTF_8), collection);
        }
    }