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com.xmlcalabash.extensions.MetadataExtractor Maven / Gradle / Ivy
package com.xmlcalabash.extensions;
import com.drew.imaging.jpeg.JpegMetadataReader;
import com.drew.imaging.jpeg.JpegProcessingException;
import com.drew.metadata.Directory;
import com.drew.metadata.Metadata;
import com.drew.metadata.Tag;
import com.xmlcalabash.core.XProcConstants;
import com.xmlcalabash.core.XProcException;
import com.xmlcalabash.core.XProcRuntime;
import com.xmlcalabash.io.WritablePipe;
import com.xmlcalabash.library.DefaultStep;
import com.xmlcalabash.runtime.XAtomicStep;
import com.xmlcalabash.util.TreeWriter;
import net.sf.saxon.s9api.QName;
import net.sf.saxon.s9api.SaxonApiException;
import java.awt.*;
import java.awt.image.ImageObserver;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.BufferedReader;
import java.net.MalformedURLException;
import java.net.URI;
import java.net.URL;
import java.net.URLConnection;
import java.text.CharacterIterator;
import java.text.StringCharacterIterator;
import java.util.Iterator;
import java.util.StringTokenizer;
/**
* Created by IntelliJ IDEA.
* User: ndw
* Date: Oct 8, 2008
* Time: 7:44:07 AM
* To change this template use File | Settings | File Templates.
*/
public class MetadataExtractor extends DefaultStep {
private static final QName _href = new QName("","href");
private final static QName c_metadata = new QName("c", XProcConstants.NS_XPROC_STEP, "metadata");
private final static QName c_tag = new QName("c", XProcConstants.NS_XPROC_STEP, "tag");
private final static QName _dir = new QName("", "dir");
private final static QName _type = new QName("", "type");
private final static QName _name = new QName("", "name");
private final static String[] controls = new String[] {
"0000", "0001", "0002", "0003", "0004", "0005", "0006", "0007",
"0008", "000b", "000c", "000e", "000f",
"0010", "0011", "0012", "0013", "0014", "0015", "0016", "0017",
"0018", "0019", "001a", "001b", "001c", "001d", "001e", "001f",
"007c" };
private WritablePipe result = null;
/**
* Creates a new instance of Identity
*/
public MetadataExtractor(XProcRuntime runtime, XAtomicStep step) {
super(runtime,step);
}
public void setOutput(String port, WritablePipe pipe) {
result = pipe;
}
public void reset() {
result.resetWriter();
}
public void run() throws SaxonApiException {
super.run();
URI href = getOption(_href).getBaseURI().resolve(getOption(_href).getString());
try {
URL url = href.toURL();
URLConnection connection = url.openConnection();
InputStream stream = connection.getInputStream();
Metadata metadata = JpegMetadataReader.readMetadata(stream);
TreeWriter tree = new TreeWriter(runtime);
tree.startDocument(step.getNode().getBaseURI());
tree.addStartElement(c_metadata);
tree.addAttribute(_href, href.toASCIIString());
tree.startContent();
// iterate through metadata directories
Iterator directories = metadata.getDirectories().iterator();
while (directories.hasNext()) {
Directory directory = directories.next();
String dir = directory.getName();
Iterator tags = directory.getTags().iterator();
while (tags.hasNext()) {
Tag tag = tags.next();
tree.addStartElement(c_tag);
tree.addAttribute(_dir, dir);
tree.addAttribute(_type, tag.getTagTypeHex());
tree.addAttribute(_name, tag.getTagName());
String value = tag.getDescription();
// Laboriously escape all the control characters with \\uxxxx, but first replace
// \\uxxxx with \\u005cuxxxx so we don't inadvertantly change the meaning of a string
value = value.replaceAll("\\\\u([0-9a-fA-F]{4}+)", "\\\\u005cu$1");
for (String control : controls) {
String match = "^.*\\u" + control + ".*$";
if (value.matches(match)) {
value = value.replaceAll("[\\u" + control + "]", "\\\\u" + control);
}
}
// Bah humbug...I don't see an easy way to tell if it's a date/time
if (value.matches("^\\d\\d\\d\\d:\\d\\d:\\d\\d \\d\\d:\\d\\d:\\d\\d$")) {
String iso = value.substring(0, 4) + "-" + value.substring(5, 7) + "-" + value.substring(8, 10)
+ "T" + value.substring(11,19);
value = iso;
}
tree.startContent();
tree.addText(value);
tree.addEndElement();
}
}
tree.addEndElement();
tree.endDocument();
result.write(tree.getResult());
} catch (IOException ioe) {
throw new XProcException(ioe);
} catch (JpegProcessingException e) {
// Not a JPEG? Let's try to do at least the intrinsics...
runIntrinsics(href);
}
}
private void runIntrinsics(URI href) throws SaxonApiException {
ImageIntrinsics intrinsics = new ImageIntrinsics();
intrinsics.run(href.toASCIIString());
}
private class ImageIntrinsics implements ImageObserver {
boolean imageLoaded = false;
boolean imageFailed = false;
Image image = null;
int width = -1;
int depth = -1;
public void run(String imageFn) {
imageLoaded = false;
imageFailed = false;
image = null;
width = -1;
depth = -1;
System.setProperty("java.awt.headless","true");
try {
URL url = new URL(imageFn);
image = Toolkit.getDefaultToolkit().getImage (url);
} catch (MalformedURLException mue) {
image = Toolkit.getDefaultToolkit().getImage (imageFn);
}
width = image.getWidth(this);
depth = image.getHeight(this);
while (!imageFailed && (width == -1 || depth == -1)) {
try {
Thread.sleep(50);
} catch (Exception e) {
// nop;
}
width = image.getWidth(this);
depth = image.getHeight(this);
}
image.flush();
if ((width == -1 || depth == -1) && imageFailed) {
// Maybe it's an EPS or PDF?
// FIXME: this code is crude
BufferedReader ir = null;
String line = null;
int lineLimit = 100;
try {
ir = new BufferedReader(new FileReader(new File(imageFn)));
line = ir.readLine();
if (line != null && line.startsWith("%PDF-")) {
// We've got a PDF!
while (lineLimit > 0 && line != null) {
lineLimit--;
if (line.startsWith("/CropBox [")) {
line = line.substring(10);
if (line.indexOf("]") >= 0) {
line = line.substring(0, line.indexOf("]"));
}
parseBox(line);
lineLimit = 0;
}
line = ir.readLine();
}
} else if (line != null
&& line.startsWith("%!")
&& line.indexOf(" EPSF-") > 0) {
// We've got an EPS!
while (lineLimit > 0 && line != null) {
lineLimit--;
if (line.startsWith("%%BoundingBox: ")) {
line = line.substring(15);
parseBox(line);
lineLimit = 0;
}
line = ir.readLine();
}
} else {
System.err.println("Failed to interpret image: " + imageFn);
}
} catch (Exception e) {
System.err.println("Failed to load image: " + imageFn);
// nop;
}
if (ir != null) {
try {
ir.close();
} catch (Exception e) {
// nop;
}
}
}
if (width >= 0) {
TreeWriter tree = new TreeWriter(runtime);
tree.startDocument(step.getNode().getBaseURI());
tree.addStartElement(c_metadata);
tree.addAttribute(_href, imageFn);
tree.startContent();
tree.addStartElement(c_tag);
tree.addAttribute(_dir, "Exif");
tree.addAttribute(_type, "0x9000");
tree.addAttribute(_name, "Exif Version");
tree.startContent();
tree.addText("0");
tree.addEndElement();
tree.addStartElement(c_tag);
tree.addAttribute(_dir, "Jpeg");
tree.addAttribute(_type, "0x0001");
tree.addAttribute(_name, "Image Height");
tree.startContent();
tree.addText(""+depth+" pixels");
tree.addEndElement();
tree.addStartElement(c_tag);
tree.addAttribute(_dir, "Jpeg");
tree.addAttribute(_type, "0x0003");
tree.addAttribute(_name, "Image Width");
tree.startContent();
tree.addText(""+width+" pixels");
tree.addEndElement();
tree.endDocument();
result.write(tree.getResult());
} else {
throw new XProcException("Failed to read image intrinsics");
}
}
private void parseBox(String line) {
int [] corners = new int [4];
int count = 0;
StringTokenizer st = new StringTokenizer(line);
while (count < 4 && st.hasMoreTokens()) {
try {
corners[count++] = Integer.parseInt(st.nextToken());
} catch (Exception e) {
// nop;
}
}
width = corners[2] - corners[0];
depth = corners[3] - corners[1];
}
public boolean imageUpdate(Image img, int infoflags,
int x, int y, int width, int height) {
if (((infoflags & ImageObserver.ERROR) == ImageObserver.ERROR)
|| ((infoflags & ImageObserver.ABORT) == ImageObserver.ABORT)) {
imageFailed = true;
return false;
}
// I really only care about the width and height, but if I return false as
// soon as those are available, the BufferedInputStream behind the loader
// gets closed too early.
if ((infoflags & ImageObserver.ALLBITS) == ImageObserver.ALLBITS) {
return false;
} else {
return true;
}
}
}
}
