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/*
* Copyright 1999-2004 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.render.rtf;
import java.util.Map;
import java.util.HashMap;
//FOP
import org.apache.fop.apps.FOPException;
/** Converts XSL-FO units to RTF units
*
* @author Bertrand Delacretaz <bdelacretaz@codeconsult.ch>
* @author putzi
* @author Peter Herweg <pherweg@web.de>
*
* This class was originally developed by Bertrand Delacretaz bdelacretaz@codeconsult.ch
* for the JFOR project and is now integrated into FOP.
*/
class FoUnitsConverter {
private static final FoUnitsConverter INSTANCE = new FoUnitsConverter();
/** points to twips: 1 twip is 1/20 of a point */
public static final float POINT_TO_TWIPS = 20f;
/** millimeters and centimeters to twips: , one point is 1/72 of an inch, one inch is 25.4 mm */
public static final float IN_TO_TWIPS = 72f * POINT_TO_TWIPS;
public static final float MM_TO_TWIPS = IN_TO_TWIPS / 25.4f;
public static final float CM_TO_TWIPS = 10 * MM_TO_TWIPS;
/** conversion factors keyed by xsl:fo units names */
private static final Map TWIP_FACTORS = new HashMap();
static {
TWIP_FACTORS.put("mm", new Float(MM_TO_TWIPS));
TWIP_FACTORS.put("cm", new Float(CM_TO_TWIPS));
TWIP_FACTORS.put("pt", new Float(POINT_TO_TWIPS));
TWIP_FACTORS.put("in", new Float(IN_TO_TWIPS));
}
/** singleton pattern */
private FoUnitsConverter() {
}
/** singleton pattern */
static FoUnitsConverter getInstance() {
return INSTANCE;
}
/** convert given value to RTF units
* @param foValue a value like "12mm"
* TODO: tested with "mm" units only, needs work to comply with FO spec
* Why does it search for period instead of simply breaking last two
* Characters into another units string? - Chris
*/
float convertToTwips(String foValue)
throws FOPException {
foValue = foValue.trim();
// break value into number and units
final StringBuffer number = new StringBuffer();
final StringBuffer units = new StringBuffer();
for (int i = 0; i < foValue.length(); i++) {
final char c = foValue.charAt(i);
if (Character.isDigit(c) || c == '.') {
number.append(c);
} else {
// found the end of the digits
units.append(foValue.substring(i).trim());
break;
}
}
return numberToTwips(number.toString(), units.toString());
}
/** convert given value to twips according to given units */
private float numberToTwips(String number, String units)
throws FOPException {
float result = 0;
// convert number to integer
try {
if (number != null && number.trim().length() > 0) {
result = Float.valueOf(number).floatValue();
}
} catch (Exception e) {
throw new FOPException("number format error: cannot convert '"
+ number + "' to float value");
}
// find conversion factor
if (units != null && units.trim().length() > 0) {
final Float factor = (Float)TWIP_FACTORS.get(units.toLowerCase());
if (factor == null) {
throw new FOPException("conversion factor not found for '" + units + "' units");
}
result *= factor.floatValue();
}
return result;
}
/** convert a font size given in points like "12pt" */
int convertFontSize(String size) throws FOPException {
size = size.trim();
final String FONT_SUFFIX = "pt";
if (!size.endsWith(FONT_SUFFIX)) {
throw new FOPException("Invalid font size '" + size + "', must end with '"
+ FONT_SUFFIX + "'");
}
float result = 0;
size = size.substring(0, size.length() - FONT_SUFFIX.length());
try {
result = (Float.valueOf(size).floatValue());
} catch (Exception e) {
throw new FOPException("Invalid font size value '" + size + "'");
}
// RTF font size units are in half-points
return (int)(result * 2.0);
}
}
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