/*
* This program is free software; you can redistribute it and/or modify it under the
* terms of the GNU Lesser General Public License, version 2.1 as published by the Free Software
* Foundation.
*
* You should have received a copy of the GNU Lesser General Public License along with this
* program; if not, you can obtain a copy at http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
* or from the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU Lesser General Public License for more details.
*
* Copyright (c) 2006 - 2013 Pentaho Corporation and Contributors.  All rights reserved.
*/

package org.pentaho.reporting.libraries.resourceloader;

import java.io.Serializable;
import java.util.HashMap;

/**
 * Creation-Date: 08.04.2006, 14:12:14
 *
 * @author Thomas Morgner
 */
public class DependencyCollector implements Serializable, Cloneable {
  private HashMap dependencies;
  private static final long serialVersionUID = -3568774359923270189L;

  public DependencyCollector( final ResourceKey source,
                              final long version ) {
    if ( source == null ) {
      throw new NullPointerException();
    }
    dependencies = new HashMap();
    dependencies.put( source, new Long( version ) );
  }

  public ResourceKey[] getDependencies() {
    return (ResourceKey[]) dependencies.keySet().toArray
      ( new ResourceKey[ dependencies.size() ] );
  }

  public void add( final Resource dependentResource ) {
    if ( dependentResource == null ) {
      throw new NullPointerException();
    }

    final ResourceKey[] depKeys = dependentResource.getDependencies();
    for ( int i = 0; i < depKeys.length; i++ ) {
      final ResourceKey depKey = depKeys[ i ];
      final long version = dependentResource.getVersion( depKey );
      add( depKey, version );
    }
  }

  public void add( final ResourceKey resourceKey, final long version ) {
    if ( resourceKey == null ) {
      throw new NullPointerException();
    }

    dependencies.put( resourceKey, new Long( version ) );
  }

  public long getVersion( final ResourceKey key ) {
    if ( key == null ) {
      throw new NullPointerException();
    }

    final Long l = (Long) dependencies.get( key );
    if ( l == null ) {
      return -1;
    }
    return l.longValue();
  }

  public Object clone() throws CloneNotSupportedException {
    final DependencyCollector dc = (DependencyCollector) super.clone();
    dc.dependencies = (HashMap) dependencies.clone();
    return dc;
  }
}