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1   /*
2    * Copyright 2002 - 2007 JEuclid, http://jeuclid.sf.net
3    *
4    * Licensed under the Apache License, Version 2.0 (the "License");
5    * you may not use this file except in compliance with the License.
6    * You may obtain a copy of the License at
7    *
8    *      http://www.apache.org/licenses/LICENSE-2.0
9    *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS,
12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   * See the License for the specific language governing permissions and
14   * limitations under the License.
15   */
16  
17  /* $Id: StyleAttributeLayoutContext.java,v 8afef6dd0d58 2007/09/14 08:29:58 maxberger $ */
18  
19  package net.sourceforge.jeuclid.context;
20  
21  import java.awt.Color;
22  
23  import net.sourceforge.jeuclid.LayoutContext;
24  import net.sourceforge.jeuclid.elements.support.attributes.AttributesHelper;
25  
26  /**
27   * @version $Revision: 8afef6dd0d58 $
28   */
29  public class StyleAttributeLayoutContext implements LayoutContext {
30  
31      private final LayoutContext parentLayoutContext;
32  
33      private final String sizeString;
34  
35      private final Color foregroundColor;
36  
37      /**
38       * Default Constructor.
39       * 
40       * @param parent
41       *            LayoutContext of parent.
42       * @param msize
43       *            msize String to apply to parent context.
44       * @param foreground
45       *            Foreground color for new context.
46       */
47      public StyleAttributeLayoutContext(final LayoutContext parent,
48              final String msize, final Color foreground) {
49          this.parentLayoutContext = parent;
50          this.sizeString = msize;
51          this.foregroundColor = foreground;
52      }
53  
54      /** {@inheritDoc} */
55      public Object getParameter(final Parameter which) {
56          final Object retVal;
57          if (Parameter.MATHSIZE.equals(which) && (this.sizeString != null)) {
58              retVal = AttributesHelper.convertSizeToPt(this.sizeString,
59                      this.parentLayoutContext, AttributesHelper.PT);
60          } else if (Parameter.MATHCOLOR.equals(which)
61                  && this.foregroundColor != null) {
62              retVal = this.foregroundColor;
63          } else {
64              retVal = this.parentLayoutContext.getParameter(which);
65          }
66          return retVal;
67      }
68  }