com.globalsight.terminology.importer.GTXmlReaderThread.java Source code

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Here is the source code for com.globalsight.terminology.importer.GTXmlReaderThread.java

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/**
 *  Copyright 2009 Welocalize, Inc. 
 *  
 *  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 com.globalsight.terminology.importer;

import org.apache.log4j.Logger;

import com.globalsight.terminology.Termbase;
import com.globalsight.terminology.Entry;

import com.globalsight.importer.ImportOptions;

import com.globalsight.util.ReaderResult;
import com.globalsight.util.ReaderResultQueue;

import org.dom4j.*;
import org.dom4j.io.SAXReader;

/**
 * Reads GTXML files and produces Entry objects by putting
 * ReaderResult objects into a ReaderResultQueue.
 */
public class GTXmlReaderThread extends Thread {
    private static final Logger CATEGORY = Logger.getLogger(GTXmlReaderThread.class);

    private ReaderResultQueue m_results;
    private ReaderResult m_result = null;
    private ImportOptions m_options;
    private Termbase m_termbase;
    private DocumentFactory m_factory;

    //
    // Constructor
    //
    public GTXmlReaderThread(ReaderResultQueue p_queue, ImportOptions p_options, Termbase p_termbase) {
        m_results = p_queue;
        m_options = p_options;
        m_termbase = p_termbase;
        m_factory = new DocumentFactory();
    }

    //
    // Thread methods
    //
    public void run() {
        try {
            SAXReader reader = new SAXReader();
            reader.setXMLReaderClassName("org.apache.xerces.parsers.SAXParser");

            // enable pruning to call me back as each Element is complete
            reader.addHandler("/entries/conceptGrp", new ElementHandler() {
                public void onStart(ElementPath path) {
                }

                public void onEnd(ElementPath path) {
                    Element element = path.getCurrent();

                    // prune the current element to reduce memory
                    element.detach();

                    Document doc = m_factory.createDocument(element);
                    Entry entry = new Entry(doc);

                    m_result = m_results.hireResult();
                    m_result.setResultObject(entry);

                    boolean done = m_results.put(m_result);
                    m_result = null;

                    // Stop reading the TMX file.
                    if (done) {
                        throw new ThreadDeath();
                    }
                }
            });

            String url = m_options.getFileName();

            reader.read(url);
        } catch (ThreadDeath ignore) {
            CATEGORY.info("ReaderThread: interrupted.");
        } catch (Throwable ignore) {
            // Should never happen, and I don't know how to handle
            // this case other than passing the exception in
            // m_results, which I won't do for now.
        } finally {
            if (m_result != null) {
                m_results.fireResult(m_result);
                m_result = null;
            }

            m_results.producerDone();
            m_results = null;

            CATEGORY.debug("ReaderThread: done.");
        }
    }
}