Package com.clarkparsia.empire.jena

Source Code of com.clarkparsia.empire.jena.JenaTestDataSourceFactory

/*
* Copyright (c) 2009-2010 Clark & Parsia, LLC. <http://www.clarkparsia.com>
*
* 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.clarkparsia.empire.jena;

import com.clarkparsia.empire.ds.DataSource;
import com.clarkparsia.empire.ds.DataSourceException;

import com.clarkparsia.empire.ds.Alias;
import com.clarkparsia.empire.config.EmpireConfiguration;

import java.util.Map;
import java.util.HashMap;

import java.io.FileInputStream;

import com.hp.hpl.jena.rdf.model.Model;
import com.hp.hpl.jena.rdf.model.RDFReader;
import com.google.inject.name.Named;
import com.google.inject.Inject;
import com.google.common.base.Splitter;

/**
* <p>Implementation of the DataSourceFactory interface for creating in-memory Jena-backed data sources
* from data files on disk.  Created models are stored locally to save the overhead of re-parsing the
* files each time.  Intended to only be used for testing.</p>
*
* @author Michael Grove
* @since 0.6
* @version 0.7
*/
@Alias("jena-test")
class JenaTestDataSourceFactory extends BaseJenaDataSourceFactory {

  /**
   * Cache of data sources
   */
  private static Map<String, DataSource> mSourceCache = new HashMap<String, DataSource>();

  /**
   * @inheritDoc
   */
  public boolean canCreate(final Map<String, Object> theMap) {
    return true;
  }

  /**
   * @inheritDoc
   */
  public DataSource create(final Map<String, Object> theMap) throws DataSourceException {
    // tests should reuse the same source.
    if (theMap.containsKey("files") && mSourceCache.containsKey(theMap.get("files"))) {
      return mSourceCache.get(theMap.get("files"));
    }

    Model aModel = createModel(theMap);

    if (theMap.containsKey("files")) {
      for (String aFile : Splitter.on(",").omitEmptyStrings().trimResults().split(theMap.get("files").toString())) {
        RDFReader aReader = aModel.getReader();
        aReader.setProperty("WARN_REDEFINITION_OF_ID","EM_IGNORE");

        try {
          aReader.read(aModel, new FileInputStream(aFile.trim()), "");
        }
        catch (Exception e) {
          aReader = aModel.getReader("N3");
          aReader.setProperty("WARN_REDEFINITION_OF_ID","EM_IGNORE");
         
          try {
            aReader.read(aModel, new FileInputStream(aFile.trim()), "");
          }
          catch (Exception ex) {
            aReader = aModel.getReader("N-TRIPLE");
            aReader.setProperty("WARN_REDEFINITION_OF_ID","EM_IGNORE");

            try {
              aReader.read(aModel, new FileInputStream(aFile.trim()), "");
            }
            catch (Exception exc) {
              throw new DataSourceException(e);
            }
          }
        }
      }
    }

    DataSource aSource = new JenaDataSource(aModel);

    //mSourceCache.put(theMap.get("files").toString(), aSource);

    return aSource;
  }
}
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