/*
* 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;

/**
 * Creation-Date: 08.04.2006, 14:08:13
 *
 * @author Thomas Morgner
 */
public class CompoundResource implements Resource {
  private static final long serialVersionUID = -5828242419391352185L;

  private ResourceKey source;
  private DependencyCollector dependencies;
  private Object product;
  private Class targetType;

  public CompoundResource( final ResourceKey source,
                           final DependencyCollector dependencies,
                           final Object product,
                           final Class targetType ) {
    if ( source == null ) {
      throw new NullPointerException( "Source must not be null" );
    }
    if ( dependencies == null ) {
      throw new NullPointerException( "Dependecies must be given." );
    }
    if ( targetType == null ) {
      throw new NullPointerException( "TargetType must not be null" );
    }
    if ( product == null ) {
      throw new NullPointerException( "Product must not be null" );
    }
    this.targetType = targetType;
    this.source = source;
    try {
      this.dependencies = (DependencyCollector) dependencies.clone();
    } catch ( CloneNotSupportedException e ) {
      throw new IllegalStateException
        ( "Clone not supported? This should not happen." );
    }
    this.product = product;
  }

  public Object getResource() throws ResourceException {
    return product;
  }

  public long getVersion( final ResourceKey key ) {
    return dependencies.getVersion( key );
  }

  /**
   * The primary source is also included in this set. The dependencies are given as ResourceKey objects. The keys itself
   * do not hold any state information.
   * <p/>
   * The dependencies do not track deep dependencies. So if Resource A depends on Resource B which depends on Resource
   * C, then A only knows about B, not C.
   *
   * @return
   */
  public ResourceKey[] getDependencies() {
    return dependencies.getDependencies();
  }

  public ResourceKey getSource() {
    return source;
  }

  public Class getTargetType() {
    return targetType;
  }

  public boolean isTemporaryResult() {
    return false;
  }
}