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- /*
- * 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.render.rtf;
-
- import java.util.HashMap;
- import java.util.Map;
-
- import org.apache.fop.apps.FOPException;
- import org.apache.fop.fo.properties.FixedLength;
-
-
- /** 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.
- */
-
- final 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(FixedLength.MM, new Float(MM_TO_TWIPS));
- TWIP_FACTORS.put(FixedLength.CM, new Float(CM_TO_TWIPS));
- TWIP_FACTORS.put(FixedLength.POINT, new Float(POINT_TO_TWIPS));
- TWIP_FACTORS.put(FixedLength.INCH, 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 sFONTSUFFIX = FixedLength.POINT;
- if (!size.endsWith(sFONTSUFFIX)) {
- throw new FOPException("Invalid font size '" + size + "', must end with '"
- + sFONTSUFFIX + "'");
- }
-
- float result = 0;
- size = size.substring(0, size.length() - sFONTSUFFIX.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);
- }
-
- public float convertMptToTwips(int width) {
- return width * POINT_TO_TWIPS / 1000;
- }
- }
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