XAlternateTextReadHandler.java

/*!
* 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) 2002-2013 Pentaho Corporation..  All rights reserved.
*/

package org.pentaho.reporting.libraries.css.parser.stylehandler.content;

import org.pentaho.reporting.libraries.css.model.StyleKey;
import org.pentaho.reporting.libraries.css.parser.CSSValueFactory;
import org.pentaho.reporting.libraries.css.parser.CSSValueReadHandler;
import org.pentaho.reporting.libraries.css.values.CSSAttrFunction;
import org.pentaho.reporting.libraries.css.values.CSSConstant;
import org.pentaho.reporting.libraries.css.values.CSSFunctionValue;
import org.pentaho.reporting.libraries.css.values.CSSStringValue;
import org.pentaho.reporting.libraries.css.values.CSSValue;
import org.pentaho.reporting.libraries.css.values.CSSValueList;
import org.w3c.css.sac.LexicalUnit;

import java.util.ArrayList;

/**
 * Creation-Date: 30.05.2006, 14:56:09
 *
 * @author Thomas Morgner
 */
public class XAlternateTextReadHandler implements CSSValueReadHandler {
  public XAlternateTextReadHandler() {
  }

  public CSSValue createValue( StyleKey name, LexicalUnit value ) {

    final ArrayList contents = new ArrayList();
    final ArrayList contentList = new ArrayList();
    while ( value != null ) {
      if ( value.getLexicalUnitType() == LexicalUnit.SAC_IDENT ) {
        return null;
      } else if ( value.getLexicalUnitType() == LexicalUnit.SAC_STRING_VALUE ) {
        contentList.add( new CSSConstant( value.getStringValue() ) );
      } else if ( value.getLexicalUnitType() == LexicalUnit.SAC_URI ) {
        final CSSStringValue uriValue = CSSValueFactory.createUriValue( value );
        if ( uriValue == null ) {
          return null;
        }
        contentList.add( uriValue );
      } else if ( value.getLexicalUnitType() == LexicalUnit.SAC_FUNCTION ||
        value.getLexicalUnitType() == LexicalUnit.SAC_COUNTER_FUNCTION ||
        value.getLexicalUnitType() == LexicalUnit.SAC_COUNTERS_FUNCTION ) {
        final CSSFunctionValue functionValue =
          CSSValueFactory.parseFunction( value );
        if ( functionValue == null ) {
          return null;
        }
        contentList.add( functionValue );
      } else if ( value.getLexicalUnitType() == LexicalUnit.SAC_ATTR ) {
        final CSSAttrFunction attrFn = CSSValueFactory.parseAttrFunction( value );
        if ( attrFn == null ) {
          return null;
        }
        contentList.add( attrFn );
      } else if ( value.getLexicalUnitType() == LexicalUnit.SAC_OPERATOR_COMMA ) {
        final CSSValue[] values =
          (CSSValue[]) contentList.toArray(
            new CSSValue[ contentList.size() ] );
        final CSSValueList sequence = new CSSValueList( values );
        contents.add( sequence );
      }
      value = value.getNextLexicalUnit();
    }

    final CSSValue[] values =
      (CSSValue[]) contentList.toArray( new CSSValue[ contentList.size() ] );
    final CSSValueList sequence = new CSSValueList( values );
    contents.add( sequence );
    return new CSSValueList( contents );
  }
}