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GATE - general achitecture for text engineering - is open source software capable of solving almost any text processing problem. This artifact enables you to embed the core GATE Embedded with its essential dependencies. You will able to use the GATE Embedded API and load and store GATE XML documents. This artifact is the perfect dependency for CREOLE plugins or for applications that need to customize the GATE dependencies due to confict with their own dependencies or for lower footprint.

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/*
 *  Copyright (c) 1995-2012, The University of Sheffield. See the file
 *  COPYRIGHT.txt in the software or at http://gate.ac.uk/gate/COPYRIGHT.txt
 *
 *  This file is part of GATE (see http://gate.ac.uk/), and is free
 *  software, licenced under the GNU Library General Public License,
 *  Version 2, June 1991 (in the distribution as file licence.html,
 *  and also available at http://gate.ac.uk/gate/licence.html).
 *
 *  Valentin Tablan 26/10/2001
 *
 *  $Id: CollectionPersistence.java 18176 2014-07-11 15:45:13Z johann_p $
 *
 */
package gate.util.persistence;

import gate.creole.ResourceInstantiationException;
import gate.persist.PersistenceException;
import gate.util.Err;

import java.io.Serializable;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;


public class CollectionPersistence extends AbstractPersistence {

  /**
   * Populates this Persistence with the data that needs to be stored from the
   * original source object.
   */
  @Override
  public void extractDataFromSource(Object source)throws PersistenceException{
    if(! (source instanceof Collection)){
      throw new UnsupportedOperationException(
                getClass().getName() + " can only be used for " +
                Collection.class.getName() +
                " objects!\n" + source.getClass().getName() +
                " is not a " + Collection.class.getName());
    }
    collectionType = source.getClass();

    Collection coll = (Collection)source;

    //get the values in the iterator's order
    localList = new ArrayList(coll.size());
    Iterator elemIter = coll.iterator();
    while(elemIter.hasNext()){
      localList.add(PersistenceManager.
                    getPersistentRepresentation(elemIter.next()));
    }
  }

  /**
   * Creates a new object from the data contained. This new object is supposed
   * to be a copy for the original object used as source for data extraction.
   */
  @SuppressWarnings("unchecked")
  @Override
  public Object createObject()throws PersistenceException,
                                     ResourceInstantiationException{
    List exceptionsOccurred = new ArrayList();
    //let's try to create a collection of the same type as the original
    Collection result = null;
    try{
      result = (Collection)collectionType.newInstance();
    }catch(Exception e){
      // ignore - if we can't create a collection of the original type
      // for any reason, just create an ArrayList as a fallback.  The
      // main use for this class is to persist parameter values for
      // GATE resources, and GATE can convert an ArrayList to any type
      // required by a resource parameter.
    }
    if(result == null) result = new ArrayList(localList.size());

    //now we have the collection let's populate it
    for(Object local : localList) {
      try {
        result.add(PersistenceManager.getTransientRepresentation(
                local,containingControllerName,initParamOverrides));
      }
      catch(PersistenceException pe) {
        exceptionsOccurred.add(pe.getMessage());
        pe.printStackTrace(Err.getPrintWriter());
      }
      catch(ResourceInstantiationException rie) {
        exceptionsOccurred.add(rie.getMessage());
        rie.printStackTrace(Err.getPrintWriter());
      }
    }

    if(exceptionsOccurred.size() > 0) {
      throw new PersistenceException("Some resources cannot be restored:\n" +
        Arrays.toString(exceptionsOccurred
        .toArray(new String[exceptionsOccurred.size()]))
        .replaceAll("[\\]\\[]", "").replaceAll(", ", "\n"));
    }

    return result;
  }


  protected List localList;
  protected Class collectionType;
  static final long serialVersionUID = 7908364068699089834L;
}