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/*
* $Id$
* ============================================================================
* The Apache Software License, Version 1.1
* ============================================================================
*
* Copyright (C) 1999-2003 The Apache Software Foundation. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modifica-
* tion, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* 3. The end-user documentation included with the redistribution, if any, must
* include the following acknowledgment: "This product includes software
* developed by the Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowledgment may appear in the software itself, if
* and wherever such third-party acknowledgments normally appear.
*
* 4. The names "FOP" and "Apache Software Foundation" must not be used to
* endorse or promote products derived from this software without prior
* written permission. For written permission, please contact
* apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache", nor may
* "Apache" appear in their name, without prior written permission of the
* Apache Software Foundation.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* APACHE SOFTWARE FOUNDATION OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLU-
* DING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
* ============================================================================
*
* This software consists of voluntary contributions made by many individuals
* on behalf of the Apache Software Foundation and was originally created by
* James Tauber <jtauber@jtauber.com>. For more information on the Apache
* Software Foundation, please see <http://www.apache.org/>.
*/
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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