| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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. |
| */ |
| |
| /* $Id$ */ |
| |
| package org.apache.fop.layoutmgr; |
| |
| /** |
| * This class is the base class for all kinds of elements that are added to element lists. There |
| * are basically two kinds of list elements: Knuth elements and unresolved elements like spaces, |
| * border and padding elements which are converted to Knuth elements prior to the breaking |
| * process. |
| */ |
| public abstract class ListElement { |
| |
| private Position position; |
| |
| /** |
| * Main constructor |
| * @param position the Position instance needed by the addAreas stage of the LMs. |
| */ |
| public ListElement(Position position) { |
| this.position = position; |
| } |
| |
| /** |
| * @return the Position instance for this element. |
| */ |
| public Position getPosition() { |
| return this.position; |
| } |
| |
| /** |
| * Change the Position stored in this element. |
| * @param position the Position instance |
| */ |
| public void setPosition(Position position) { |
| this.position = position; |
| } |
| |
| /** |
| * @return the LayoutManager responsible for this element. |
| */ |
| public LayoutManager getLayoutManager() { |
| if (position != null) { |
| return position.getLM(); |
| } else { |
| return null; |
| } |
| } |
| |
| /** @return true if this element is a KnuthBox. */ |
| public boolean isBox() { |
| return false; |
| } |
| |
| /** @return true if this element is a KnuthGlue. */ |
| public boolean isGlue() { |
| return false; |
| } |
| |
| /** @return true if this element is a KnuthPenalty. */ |
| public boolean isPenalty() { |
| return false; |
| } |
| |
| /** @return true if the element is a penalty and represents a forced break. */ |
| public boolean isForcedBreak() { |
| return false; |
| } |
| |
| /** @return true if the element is an unresolved element such as a space or a border. */ |
| public boolean isUnresolvedElement() { |
| return true; |
| } |
| |
| } |