001    /*
002     * Copyright 2002 - 2007 JEuclid, http://jeuclid.sf.net
003     *
004     * Licensed under the Apache License, Version 2.0 (the "License");
005     * you may not use this file except in compliance with the License.
006     * You may obtain a copy of the License at
007     *
008     *      http://www.apache.org/licenses/LICENSE-2.0
009     *
010     * Unless required by applicable law or agreed to in writing, software
011     * distributed under the License is distributed on an "AS IS" BASIS,
012     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013     * See the License for the specific language governing permissions and
014     * limitations under the License.
015     */
016    
017    /* $Id: StyleAttributeLayoutContext.java,v 8afef6dd0d58 2007/09/14 08:29:58 maxberger $ */
018    
019    package net.sourceforge.jeuclid.context;
020    
021    import java.awt.Color;
022    
023    import net.sourceforge.jeuclid.LayoutContext;
024    import net.sourceforge.jeuclid.elements.support.attributes.AttributesHelper;
025    
026    /**
027     * @version $Revision: 8afef6dd0d58 $
028     */
029    public class StyleAttributeLayoutContext implements LayoutContext {
030    
031        private final LayoutContext parentLayoutContext;
032    
033        private final String sizeString;
034    
035        private final Color foregroundColor;
036    
037        /**
038         * Default Constructor.
039         * 
040         * @param parent
041         *            LayoutContext of parent.
042         * @param msize
043         *            msize String to apply to parent context.
044         * @param foreground
045         *            Foreground color for new context.
046         */
047        public StyleAttributeLayoutContext(final LayoutContext parent,
048                final String msize, final Color foreground) {
049            this.parentLayoutContext = parent;
050            this.sizeString = msize;
051            this.foregroundColor = foreground;
052        }
053    
054        /** {@inheritDoc} */
055        public Object getParameter(final Parameter which) {
056            final Object retVal;
057            if (Parameter.MATHSIZE.equals(which) && (this.sizeString != null)) {
058                retVal = AttributesHelper.convertSizeToPt(this.sizeString,
059                        this.parentLayoutContext, AttributesHelper.PT);
060            } else if (Parameter.MATHCOLOR.equals(which)
061                    && this.foregroundColor != null) {
062                retVal = this.foregroundColor;
063            } else {
064                retVal = this.parentLayoutContext.getParameter(which);
065            }
066            return retVal;
067        }
068    }