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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;
import org.apache.fop.fo.Constants;
/**
* An instance of this class represents information about a feasible
* breaking point; it does not represent any piece of content.
*
* A KnuthPenalty is a feasible breaking point unless its value is infinity;
* a KnuthPenalty whose value is -infinity represents a forced break.
*
* A KnuthPenalty is suppressed, and its width is ignored, if it is not a
* chosen breaking point; for example, a KnuthPenalty representing a
* hyphenation point has a width (the "-" width), which must be ignored if
* that point is not chosen as a breaking point.
*
* Besides the inherited methods and attributes, this class has two more
* attributes and the methods used to get them: the penalty value, which is
* a kind of "aesthetic cost" (the higher the value, the more unsightly the
* breaking point), and a boolean that marks KnuthPenalties which should not
* be chosen as breaking points for consecutive lines.
*/
public class KnuthPenalty extends KnuthElement {
/** Used for flagged penalties. See Knuth algorithm. */
public static final int FLAGGED_PENALTY = 50;
private int penalty;
private boolean bFlagged;
private int breakClass = -1;
/**
* Create a new KnuthPenalty.
*
* @param w the width of this penalty
* @param p the penalty value of this penalty
* @param f is this penalty flagged?
* @param pos the Position stored in this penalty
* @param bAux is this penalty auxiliary?
*/
public KnuthPenalty(int w, int p, boolean f, Position pos, boolean bAux) {
super(w, pos, bAux);
penalty = p;
bFlagged = f;
}
/**
* Create a new KnuthPenalty.
*
* @param w the width of this penalty
* @param p the penalty value of this penalty
* @param f is this penalty flagged?
* @param iBreakClass the break class of this penalty (one of the break-* constants)
* @param pos the Position stored in this penalty
* @param bAux is this penalty auxiliary?
*/
public KnuthPenalty(int w, int p, boolean f,
int iBreakClass, Position pos, boolean bAux) {
super(w, pos, bAux);
penalty = p;
bFlagged = f;
breakClass = iBreakClass;
}
/** @see org.apache.fop.layoutmgr.KnuthElement#isPenalty() */
public boolean isPenalty() {
return true;
}
/**
* @return the penalty value of this penalty.
*/
public int getP() {
return penalty;
}
/**
* Sets a new penalty value.
* @param p the new penalty value
*/
public void setP(int p) {
this.penalty = p;
}
/** @return true is this penalty is a flagged one. */
public boolean isFlagged() {
return bFlagged;
}
/** @see org.apache.fop.layoutmgr.KnuthElement#isForcedBreak() */
public boolean isForcedBreak() {
return penalty == -KnuthElement.INFINITE;
}
/** @return the break class of this penalty (one of the break-* constants) */
public int getBreakClass() {
return breakClass;
}
/**
* Sets the break class for this penalty.
* @param cl the break class (one of the break-* constants)
*/
public void setBreakClass(int cl) {
this.breakClass = cl;
}
/** @see java.lang.Object#toString() */
public String toString() {
StringBuffer sb = new StringBuffer(64);
if (isAuxiliary()) {
sb.append("aux. ");
}
sb.append("penalty");
sb.append(" p=");
if (getP() < 0) {
sb.append("-");
}
if (Math.abs(getP()) == INFINITE) {
sb.append("INFINITE");
} else {
sb.append(getP());
}
if (isFlagged()) {
sb.append(" [flagged]");
}
sb.append(" w=");
sb.append(getW());
if (isForcedBreak()) {
sb.append(" (forced break");
switch (getBreakClass()) {
case Constants.EN_PAGE:
sb.append(", page");
break;
case Constants.EN_COLUMN:
sb.append(", column");
break;
case Constants.EN_EVEN_PAGE:
sb.append(", even page");
break;
case Constants.EN_ODD_PAGE:
sb.append(", odd page");
break;
default:
}
sb.append(")");
}
return sb.toString();
}
}
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