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/*
* Copyright 2004-2005 The Apache Software Foundation.
*
* 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.
*/
/* $Id$ */
package org.apache.fop.layoutmgr;
/**
* This is the super class for KnuthBox, KnuthGlue and KnuthPenalty.
*
* It stores information common to all sub classes, and the methods to get it:
* the width, a Position and a boolean marking KnuthElements used for some
* special feature (for example, the additional elements used to represent
* a space when text alignment is right, left or center).
*/
public abstract class KnuthElement {
public static final int INFINITE = 1000;
private int width;
private Position position;
private boolean bIsAuxiliary;
/**
* Create a new KnuthElement.
* This class being abstract, this can be called only by subclasses.
*
* @param t the type of this element (one of the KNUTH_* constants)
* @param w the width of this element
* @param pos the Position stored in this element
* @param bAux is this an auxiliary element?
*/
protected KnuthElement(int w, Position pos, boolean bAux) {
width = w;
position = pos;
bIsAuxiliary = bAux;
}
/**
* 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 this element is an auxiliary one.
*/
public boolean isAuxiliary() {
return bIsAuxiliary;
}
/**
* Return the width of this element.
*/
public int getW() {
return width;
}
public int getP() {
throw new RuntimeException("Element is not a penalty");
}
public int getY() {
throw new RuntimeException("Element is not a glue");
}
public int getZ() {
throw new RuntimeException("Element is not a glue");
}
public boolean isForcedBreak() {
return false;
}
/**
* Return the Position stored in this element.
*/
public Position getPosition() {
return position;
}
/**
* Change the Position stored in this element.
*/
public void setPosition(Position pos) {
position = pos;
}
/**
* Return the LayoutManager responsible for this element.
*/
public LayoutManager getLayoutManager() {
if (position != null) {
return position.getLM();
} else {
return null;
}
}
}
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