/*
* 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.css.resolver.values.computed.content;

import org.pentaho.reporting.libraries.css.dom.DocumentContext;
import org.pentaho.reporting.libraries.css.dom.LayoutElement;
import org.pentaho.reporting.libraries.css.dom.LayoutStyle;
import org.pentaho.reporting.libraries.css.model.StyleKey;
import org.pentaho.reporting.libraries.css.resolver.values.ResolveHandler;
import org.pentaho.reporting.libraries.css.values.CSSConstant;
import org.pentaho.reporting.libraries.css.values.CSSValue;
import org.pentaho.reporting.libraries.css.values.CSSValueList;


public class XStringDefineResolveHandler implements ResolveHandler {
  private static final StyleKey[] EMPTY_KEYS = new StyleKey[ 0 ];

  public XStringDefineResolveHandler() {
  }

  /**
   * This indirectly defines the resolve order. The higher the order, the more dependent is the resolver on other
   * resolvers to be complete.
   *
   * @return the array of required style keys.
   */
  public StyleKey[] getRequiredStyles() {
    return EMPTY_KEYS;
  }

  /**
   * Resolves a single property.
   */
  public void resolve( final DocumentContext process,
                       final LayoutElement element,
                       final StyleKey key ) {
    final LayoutStyle layoutContext = element.getLayoutStyle();
    final CSSValue value = layoutContext.getValue( key );
    if ( value instanceof CSSValueList == false ) {
      return; // do nothing.
    }

    final CSSValueList valueList = (CSSValueList) value;
    for ( int i = 0; i < valueList.getLength(); i++ ) {
      final CSSValue item = valueList.getItem( i );
      if ( item instanceof CSSConstant == false ) {
        continue;
      }
      element.getStrings().put( item.getCSSText(), element.getStrings().get( item.getCSSText() ) );
    }
  }
}