org.qi4j.valueserialization.stax.StaxValueSerializer.java Source code

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Here is the source code for org.qi4j.valueserialization.stax.StaxValueSerializer.java

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/*
 * Copyright (c) 2012, Paul Merlin. All Rights Reserved.
 *
 * 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.qi4j.valueserialization.stax;

import java.io.OutputStream;
import javax.xml.stream.XMLOutputFactory;
import javax.xml.stream.XMLStreamWriter;
import org.apache.commons.lang.StringEscapeUtils;
import org.qi4j.spi.value.ValueSerializerAdapter;

/**
 * ValueSerializer producing Values state as XML documents.
 */
public class StaxValueSerializer extends ValueSerializerAdapter<XMLStreamWriter> {

    private final XMLOutputFactory outputFactory = XMLOutputFactory.newInstance();

    public StaxValueSerializer() {
        // Output Factory setup
        outputFactory.setProperty("javax.xml.stream.isRepairingNamespaces", Boolean.FALSE);
    }

    @Override
    protected XMLStreamWriter adaptOutput(OutputStream output) throws Exception {
        XMLStreamWriter xmlStreamWriter = outputFactory.createXMLStreamWriter(output, "UTF-8");
        xmlStreamWriter.writeStartDocument("utf-8", "1.1");
        return xmlStreamWriter;
    }

    @Override
    protected void onSerializationEnd(Object object, XMLStreamWriter output) throws Exception {
        output.writeEndDocument();
        output.flush();
        output.close();
    }

    @Override
    protected void onArrayStart(XMLStreamWriter output) throws Exception {
        output.writeStartElement("array");
    }

    @Override
    protected void onArrayEnd(XMLStreamWriter output) throws Exception {
        output.writeEndElement();
    }

    @Override
    protected void onObjectStart(XMLStreamWriter output) throws Exception {
        output.writeStartElement("object");
    }

    @Override
    protected void onObjectEnd(XMLStreamWriter output) throws Exception {
        output.writeEndElement();
    }

    @Override
    protected void onFieldStart(XMLStreamWriter output, String key) throws Exception {
        output.writeStartElement("field");
        output.writeStartElement("name");
        output.writeCharacters(key);
        output.writeEndElement();
    }

    @Override
    protected void onFieldEnd(XMLStreamWriter output) throws Exception {
        output.writeEndElement();
    }

    @Override
    protected void onValueStart(XMLStreamWriter output) throws Exception {
        output.writeStartElement("value");
    }

    @Override
    protected void onValue(XMLStreamWriter output, Object value) throws Exception {
        if (value == null) {
            output.writeStartElement("null");
            output.writeEndElement();
        } else {
            output.writeCharacters(StringEscapeUtils.escapeXml(value.toString()));
        }
    }

    @Override
    protected void onValueEnd(XMLStreamWriter output) throws Exception {
        output.writeEndElement();
    }
}