| /* ==================================================================== |
| 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. |
| ==================================================================== */ |
| |
| package org.apache.poi.hssf.usermodel; |
| |
| import java.awt.Font; |
| import java.io.File; |
| import java.io.FileInputStream; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.util.HashMap; |
| import java.util.Map; |
| import java.util.Properties; |
| |
| import org.apache.poi.util.POILogFactory; |
| import org.apache.poi.util.POILogger; |
| |
| /** |
| * Allows the user to lookup the font metrics for a particular font without |
| * actually having the font on the system. The font details are loaded as a |
| * resource from the POI jar file (or classpath) and should be contained in path |
| * "/font_metrics.properties". The font widths are for a 10 point version of the |
| * font. Use a multiplier for other sizes. |
| */ |
| final class StaticFontMetrics { |
| private static final POILogger LOGGER = POILogFactory.getLogger(StaticFontMetrics.class); |
| /** The font metrics property file we're using */ |
| private static Properties fontMetricsProps; |
| /** Our cache of font details we've already looked up */ |
| private static final Map<String, FontDetails> fontDetailsMap = new HashMap<String, FontDetails>(); |
| |
| private StaticFontMetrics() {} |
| |
| /** |
| * Retrieves the fake font details for a given font. |
| * |
| * @param font |
| * the font to lookup. |
| * @return the fake font. |
| */ |
| public static synchronized FontDetails getFontDetails(Font font) { |
| // If we haven't already identified out font metrics file, |
| // figure out which one to use and load it |
| if (fontMetricsProps == null) { |
| try { |
| fontMetricsProps = loadMetrics(); |
| } catch (IOException e) { |
| throw new RuntimeException("Could not load font metrics", e); |
| } |
| } |
| |
| // Grab the base name of the font they've asked about |
| String fontName = font.getName(); |
| |
| // Some fonts support plain/bold/italic/bolditalic variants |
| // Others have different font instances for bold etc |
| // (eg font.dialog.plain.* vs font.Californian FB Bold.*) |
| String fontStyle = ""; |
| if (font.isPlain()) { |
| fontStyle += "plain"; |
| } |
| if (font.isBold()) { |
| fontStyle += "bold"; |
| } |
| if (font.isItalic()) { |
| fontStyle += "italic"; |
| } |
| |
| // Do we have a definition for this font with just the name? |
| // If not, check with the font style added |
| String fontHeight = FontDetails.buildFontHeightProperty(fontName); |
| String styleHeight = FontDetails.buildFontHeightProperty(fontName + "." + fontStyle); |
| |
| if (fontMetricsProps.get(fontHeight) == null |
| && fontMetricsProps.get(styleHeight) != null) { |
| // Need to add on the style to the font name |
| fontName += "." + fontStyle; |
| } |
| |
| // Get the details on this font |
| FontDetails fontDetails = fontDetailsMap.get(fontName); |
| if (fontDetails == null) { |
| fontDetails = FontDetails.create(fontName, fontMetricsProps); |
| fontDetailsMap.put(fontName, fontDetails); |
| } |
| return fontDetails; |
| } |
| |
| private static Properties loadMetrics() throws IOException { |
| // Check to see if the font metric file was specified |
| // as a system property |
| File propFile = null; |
| try { |
| String propFileName = System.getProperty("font.metrics.filename"); |
| if (propFileName != null) { |
| propFile = new File(propFileName); |
| if (!propFile.exists()) { |
| LOGGER.log(POILogger.WARN, "font_metrics.properties not found at path "+propFile.getAbsolutePath()); |
| propFile = null; |
| } |
| } |
| } catch (SecurityException e) { |
| LOGGER.log(POILogger.WARN, "Can't access font.metrics.filename system property", e); |
| } |
| |
| InputStream metricsIn = null; |
| try { |
| if (propFile != null) { |
| metricsIn = new FileInputStream(propFile); |
| } else { |
| // Use the built-in font metrics file off the classpath |
| metricsIn = FontDetails.class.getResourceAsStream("/font_metrics.properties"); |
| if (metricsIn == null) { |
| String err = "font_metrics.properties not found in classpath"; |
| throw new IOException(err); |
| } |
| } |
| |
| Properties props = new Properties(); |
| props.load(metricsIn); |
| return props; |
| } finally { |
| if (metricsIn != null) { |
| metricsIn.close(); |
| } |
| } |
| } |
| } |