/*

  * Copyright 2002 - 2007 JEuclid, http://jeuclid.sf.net

  *

  * Licensed under the Apache License, Version 2.0 (the "License");

  * you may not use this file except in compliance with the License.

  * You may obtain a copy of the License at

  *

  *      http://www.apache.org/licenses/LICENSE-2.0

  *

  * Unless required by applicable law or agreed to in writing, software

  * distributed under the License is distributed on an "AS IS" BASIS,

  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

  * See the License for the specific language governing permissions and

  * limitations under the License.

  */

 /* $Id: InlineLayoutContext.java,v 601cf72e95bf 2007/09/14 13:49:37 maxberger $ */

 package net.sourceforge.jeuclid.context;

 import net.sourceforge.jeuclid.LayoutContext;

 /**

  * @version $Revision: 601cf72e95bf $

  */

 public class InlineLayoutContext implements LayoutContext {

     private final LayoutContext parentLayoutContext;

     private final boolean increaseIfAlreadyInline;

     /**

      * Default Constructor.

      * 

      * @param parent

      *            LayoutContext of parent.

      */

     public InlineLayoutContext(final LayoutContext parent) {

         this.parentLayoutContext = parent;

         this.increaseIfAlreadyInline = false;

     }

     /**

      * Behavior for mfrac.

      * 

      * @param parent

      *            LayoutContext of parent.

      * @param increase

      *            increase scriptlevel if already inline.

      */

     public InlineLayoutContext(final LayoutContext parent,

             final boolean increase) {

         this.parentLayoutContext = parent;

         this.increaseIfAlreadyInline = increase;

     }

     /** {@inheritDoc} */

     public Object getParameter(final Parameter which) {

         Object retVal;

         if (Parameter.DISPLAY.equals(which)) {

             retVal = Display.INLINE;

         } else if (this.increaseIfAlreadyInline

                 && (Parameter.SCRIPTLEVEL.equals(which))

                 && (Display.INLINE.equals(this.parentLayoutContext

                         .getParameter(Parameter.DISPLAY)))) {

             retVal = ((Integer) this.parentLayoutContext

                     .getParameter(Parameter.SCRIPTLEVEL)) + 1;

         } else {

             retVal = this.parentLayoutContext.getParameter(which);

         }

         return retVal;

     }

 }