BorderWidthResolveHandler.java example

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pentaho-reporting-master
/*
* 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.border;

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.keys.border.BorderStyle;
import org.pentaho.reporting.libraries.css.keys.border.BorderStyleKeys;
import org.pentaho.reporting.libraries.css.keys.border.BorderWidth;
import org.pentaho.reporting.libraries.css.model.StyleKey;
import org.pentaho.reporting.libraries.css.resolver.values.computed.ConstantsResolveHandler;
import org.pentaho.reporting.libraries.css.values.CSSConstant;
import org.pentaho.reporting.libraries.css.values.CSSNumericType;
import org.pentaho.reporting.libraries.css.values.CSSNumericValue;
import org.pentaho.reporting.libraries.css.values.CSSValue;

import java.util.HashMap;

/**
 * Creation-Date: 11.12.2005, 22:20:16
 *
 * @author Thomas Morgner
 */
public class BorderWidthResolveHandler extends ConstantsResolveHandler {
  private HashMap keyMapping;

  public BorderWidthResolveHandler() {
    keyMapping = new HashMap();
    keyMapping.put( BorderStyleKeys.BORDER_TOP_WIDTH, BorderStyleKeys.BORDER_TOP_STYLE );
    keyMapping.put( BorderStyleKeys.BORDER_LEFT_WIDTH, BorderStyleKeys.BORDER_LEFT_STYLE );
    keyMapping.put( BorderStyleKeys.BORDER_BOTTOM_WIDTH, BorderStyleKeys.BORDER_BOTTOM_STYLE );
    keyMapping.put( BorderStyleKeys.BORDER_RIGHT_WIDTH, BorderStyleKeys.BORDER_RIGHT_STYLE );
    keyMapping.put( BorderStyleKeys.BORDER_BREAK_WIDTH, BorderStyleKeys.BORDER_BREAK_STYLE );

    addValue( BorderWidth.THIN, CSSNumericValue.createValue( CSSNumericType.PT, 1 ) );
    addValue( BorderWidth.MEDIUM, CSSNumericValue.createValue( CSSNumericType.PT, 3 ) );
    addValue( BorderWidth.THICK, CSSNumericValue.createValue( CSSNumericType.PT, 5 ) );
    setFallback( CSSNumericValue.ZERO_LENGTH );
  }

  /**
   * 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 new StyleKey[] {
      BorderStyleKeys.BORDER_TOP_STYLE,
      BorderStyleKeys.BORDER_LEFT_STYLE,
      BorderStyleKeys.BORDER_BOTTOM_STYLE,
      BorderStyleKeys.BORDER_RIGHT_STYLE,
      BorderStyleKeys.BORDER_BREAK_STYLE
    };
  }

  protected CSSValue resolveValue( final DocumentContext process,
                                   final LayoutElement currentNode,
                                   final StyleKey key ) {
    final StyleKey borderStyleKey = (StyleKey) keyMapping.get( key );
    if ( borderStyleKey == null ) {
      // invalid
      throw new IllegalArgumentException( "This is not a valid key: " + key );
    }

    final LayoutStyle layoutContext = currentNode.getLayoutStyle();
    final CSSValue borderStyle = layoutContext.getValue( borderStyleKey );
    if ( BorderStyle.NONE.equals( borderStyle ) ) {
      return CSSNumericValue.ZERO_LENGTH;
    }

    final CSSValue value = layoutContext.getValue( key );
    if ( value instanceof CSSConstant ) {
      return super.resolveValue( process, currentNode, key );
    }
    return value;
  }
}