package com.agilejava.docbkx.support.fop;
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import org.apache.fop.fonts.apps.PFMReader;
import org.apache.fop.fonts.apps.TTFReader;
import org.apache.fop.fonts.truetype.TTFFile;
import org.apache.fop.fonts.type1.PFMFile;
import org.apache.maven.plugin.AbstractMojo;
import org.apache.maven.plugin.MojoExecutionException;
import org.apache.maven.plugin.MojoFailureException;
import org.codehaus.plexus.util.DirectoryScanner;
import org.codehaus.plexus.util.FileUtils;
import org.w3c.dom.Document;
import javax.xml.transform.TransformerException;
/**
* A Maven plugin for generating FOP font metrics files from font files.
*
* @author Wilfred Springer
* @goal generate
*/
public class FontmetricsMojo extends AbstractMojo {
/**
* The list of all {@link MetricsFileBuilder MetricsFileBuilders} to be
* included.
*/
private MetricsFileBuilder[] builders = new MetricsFileBuilder[]{
new Type1MetricsFileBuilder(), new TtfMetricsFileBuilder()};
/**
* The directory containing the font files.
*
* @parameter expression="${basedir}/src/fonts"
*/
protected File sourceDirectory;
/**
* The directory to which the metrics files will be generated.
*
* @parameter expression="${basedir}/target/fonts"
*/
protected File targetDirectory;
/**
* Creates a WinAnsi-encoded font metrics file. Without this option, a
* CID-keyed font metrics file is created. The table below summarizes the
* differences between these two encoding options as currently used within
* FOP. Please note that this information only applies to TrueType fonts and
* TrueType collections
*
* @parameter
*/
protected boolean ansi = false;
/**
* {@inheritDoc} Generates font metric files from the font files found in
* {@link #sourceDirectory the source directory}.
*/
public void execute() throws MojoExecutionException, MojoFailureException {
String[] fontFiles = getFontFiles();
targetDirectory.mkdirs();
for (int i = 0; i < fontFiles.length; i++) {
String fontFile = fontFiles[i];
for (int j = 0; j < builders.length; j++) {
if (builders[j].matches(fontFile)) {
transform(new File(sourceDirectory, fontFile)
.getAbsolutePath(), builders[j]);
break;
}
}
}
}
/**
* Transforms the font file passed in using the given builder.
*
* @param fontFile The font file to be transformed into a metrics file.
* @param builder The builder that's going to do it.
* @throws MojoExecutionException If the builder somehow fails to do it.
*/
private void transform(String fontFile, MetricsFileBuilder builder)
throws MojoExecutionException {
try {
builder.transform(fontFile);
} catch (IOException ioe) {
// let be tolerant here
getLog().warn("Failed to transform " + fontFile, ioe);
}
}
/**
* Returns the target metrics file for the given font file.
*
* @param fontFile The file to be transformed.
* @return The name of the target metrics file.
*/
private String getTargetFile(String fontFile) {
StringBuilder builder = new StringBuilder();
String basename = FileUtils.basename(fontFile);
builder.append(basename.substring(0, basename.length() - 1));
builder.append("-metrics.xml");
File file = new File(targetDirectory, builder.toString());
return file.getAbsolutePath();
}
/**
* Returns an array of the names of all font files found.
*
* @return An array with the names of all font files found.
*/
private String[] getFontFiles() {
String[] includes = getFontFileIncludes();
getLog().debug("Patterns " + Arrays.asList(includes));
DirectoryScanner scanner = new DirectoryScanner();
scanner.setBasedir(sourceDirectory);
scanner.setIncludes(includes);
scanner.scan();
String[] results = scanner.getIncludedFiles();
if (getLog().isDebugEnabled()) {
for (int i = 0; i < results.length; i++) {
getLog().debug("Found " + results[i]);
}
getLog().debug("Found " + results.length + " font files in total.");
}
return results;
}
/**
* Returns a list of patterns of font files to be included while scanning
* for font files.
*
* @return A list of patterns matching font files to be included while
* scanning for other font files.
*/
private String[] getFontFileIncludes() {
List results = new ArrayList();
for (int i = 0; i < builders.length; i++) {
builders[i].appendSuffixes(results);
}
return (String[]) results.toArray(new String[0]);
}
private interface MetricsFileBuilder {
boolean matches(String fontFile);
void transform(String fontFile) throws IOException;
void appendSuffixes(List list);
}
private class Type1MetricsFileBuilder implements MetricsFileBuilder {
public boolean matches(String fontFile) {
return fontFile.toLowerCase().endsWith(".pfm");
}
public void transform(String fontFile) throws IOException {
PFMReader reader = new PFMReader();
getLog().debug("Parsing font: " + fontFile);
PFMFile pfm = reader.loadPFM(fontFile);
if (pfm == null) {
throw new IOException("Unable to load PFM file: " + fontFile);
}
Document doc = reader.constructFontXML(pfm, null, null, null, null);
if (doc == null) {
throw new IOException("Unable to construct font XML file");
}
try {
reader.writeFontXML(doc, getTargetFile(fontFile));
} catch (TransformerException e) {
throw new IOException("Unable to write font XML file", e);
}
}
public void appendSuffixes(List list) {
list.add("*.pfm");
list.add("*.PFM");
}
}
private class TtfMetricsFileBuilder implements MetricsFileBuilder {
public boolean matches(String fontFile) {
return fontFile.toLowerCase().endsWith(".ttf");
}
public void transform(String fontFile) throws IOException {
TTFReader reader = new TTFReader();
getLog().debug("Parsing font: " + fontFile);
TTFFile ttf = reader.loadTTF(fontFile, null);
if (ttf == null) {
throw new IOException("Unable to load TTF file: " + fontFile);
}
Document doc = reader.constructFontXML(ttf, null, null, null, null, !ansi, null);
if (doc == null) {
throw new IOException("Unable to construct font XML file");
}
try {
reader.writeFontXML(doc, getTargetFile(fontFile));
} catch (TransformerException e) {
throw new IOException("Unable to write font XML file", e);
}
}
public void appendSuffixes(List list) {
list.add("*.ttf");
list.add("*.TTF");
}
}
}