de.tudarmstadt.ukp.integration.alignment.xml.AlignmentXmlReader.java Source code

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Here is the source code for de.tudarmstadt.ukp.integration.alignment.xml.AlignmentXmlReader.java

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/*******************************************************************************
 * Copyright 2016
 * Ubiquitous Knowledge Processing (UKP) Lab
 * Technische Universitt Darmstadt
 *
 * 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 de.tudarmstadt.ukp.integration.alignment.xml;

import static org.apache.commons.io.IOUtils.closeQuietly;

import java.io.Closeable;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;

import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Unmarshaller;
import javax.xml.stream.XMLEventReader;
import javax.xml.stream.XMLInputFactory;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.events.StartElement;
import javax.xml.stream.events.XMLEvent;

import de.tudarmstadt.ukp.integration.alignment.xml.model.Alignments;
import de.tudarmstadt.ukp.integration.alignment.xml.model.XmlMeta;

/**
 * Read relevant information sources from alignment.xml file
 */
public class AlignmentXmlReader implements Closeable {

    XMLEventReader xmlEventReader;
    Unmarshaller unmarshaller;
    InputStream fs;

    public AlignmentXmlReader(File inputLocation) throws IOException {
        fs = null;
        try {
            fs = new FileInputStream(inputLocation);
            XMLInputFactory xmlInputFactory = XMLInputFactory.newInstance();
            xmlEventReader = xmlInputFactory.createXMLEventReader(fs);

            JAXBContext context;
            context = JAXBContext.newInstance(XmlMeta.class, Alignments.class);

            unmarshaller = context.createUnmarshaller();
        } catch (JAXBException | XMLStreamException e1) {
            throw new IOException(e1);
        }

    }

    public XmlMeta readMetaData() throws IOException {
        XmlMeta meta = null;
        try {
            XMLEvent e = xmlEventReader.peek();
            while (e != null && !isStartElement(e, "metadata")) {
                xmlEventReader.next();
                e = xmlEventReader.peek();
            }
            if (e != null) {
                meta = unmarshaller.unmarshal(xmlEventReader, XmlMeta.class).getValue();
            }
        } catch (XMLStreamException e1) {
            throw new IOException(e1);
        } catch (JAXBException e1) {
            throw new IOException(e1);
        }
        return meta;
    }

    public Alignments readAlignments() throws IOException {
        Alignments alignments = null;
        try {
            XMLEvent e = xmlEventReader.peek();
            while (e != null && !isStartElement(e, "alignments")) {
                xmlEventReader.next();
                e = xmlEventReader.peek();
            }
            if (e != null) {
                alignments = unmarshaller.unmarshal(xmlEventReader, Alignments.class).getValue();
            }
        } catch (XMLStreamException e1) {
            e1.printStackTrace();
            throw new IOException(e1);
        } catch (JAXBException e1) {
            e1.printStackTrace();
            throw new IOException(e1);
        }
        return alignments;
    }

    public static boolean isStartElement(XMLEvent aEvent, String aElement) {
        return aEvent.isStartElement() && ((StartElement) aEvent).getName().getLocalPart().equals(aElement);
    }

    @Override
    public void close() throws IOException {
        closeQuietly(fs);
    }
}