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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 *   or more contributor license agreements.  See the NOTICE file
 *   distributed with this work for additional information
 *   regarding copyright ownership.  The ASF licenses this file
 *   to you 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.phoenix.pherf.result.impl;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import javax.xml.bind.JAXBContext;
import javax.xml.bind.Marshaller;
import javax.xml.bind.Unmarshaller;
import javax.xml.stream.XMLInputFactory;
import javax.xml.stream.XMLStreamReader;
import javax.xml.transform.stream.StreamSource;

import org.apache.phoenix.pherf.result.DataModelResult;
import org.apache.phoenix.pherf.result.Result;
import org.apache.phoenix.pherf.result.ResultValue;
import org.apache.phoenix.pherf.result.file.ResultFileDetails;

public class XMLResultHandler extends DefaultResultHandler{

    public XMLResultHandler() {
        super();
    }

    @Override
    public synchronized void write(Result result) throws Exception {
        FileOutputStream os = null;
        JAXBContext jaxbContext = JAXBContext.newInstance(DataModelResult.class);
        Marshaller jaxbMarshaller = jaxbContext.createMarshaller();
        jaxbMarshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, Boolean.TRUE);
        try {
            os = new FileOutputStream(resultFileName);
            ResultValue resultValue = result.getResultValues().get(0);
            jaxbMarshaller.marshal(resultValue.getResultValue(), os);
        } finally {
            if (os != null) {
                os.flush();
                os.close();
            }
        }
    }

    @Override
    public synchronized void flush() throws IOException {
        return;
    }

    @Override
    public synchronized void close() throws IOException {
        return;
    }

    @Override
    public synchronized List read() throws Exception {
        return readFromResultFile(new File(resultFileName));
    }

    List readFromResultFile(File resultsFile) throws Exception {
        XMLInputFactory xif = XMLInputFactory.newInstance();
        xif.setProperty(XMLInputFactory.IS_SUPPORTING_EXTERNAL_ENTITIES, false);
        xif.setProperty(XMLInputFactory.SUPPORT_DTD, false);
        JAXBContext jaxbContext = JAXBContext.newInstance(DataModelResult.class);
        Unmarshaller jaxbUnmarshaller = jaxbContext.createUnmarshaller();
        @SuppressWarnings("rawtypes")
        List resultValue = new ArrayList<>();
        XMLStreamReader xmlReader = xif.createXMLStreamReader(new StreamSource(resultsFile));
        resultValue.add(new ResultValue<>(jaxbUnmarshaller.unmarshal(xmlReader)));
        List results = new ArrayList<>();
        results.add(new Result(ResultFileDetails.XML, null, resultValue));
        return results;
    }

    @Override
    public boolean isClosed() {
        return true;
    }

    @Override
    public void setResultFileDetails(ResultFileDetails details) {
        super.setResultFileDetails(ResultFileDetails.XML);
    }
}