/*
* Retrieve the XMP metadata for all images in the document.
*
* The metadata is written to a separate file for each image. The naming
* convention for the generated files is:
*
* <basename of input document>_images[<n>]_Metadata.txt
*
* where <n> is the index of the image in the "images" array.
*
* Required software: pCOS interface 8 (PDFlib+PDI/PPS 9, TET 4.1, PLOP 5.0)
* Required data: PDF document with images that have XMP metadata attached
*/
package com.pdflib.cookbook.pcos.interchange;
import java.io.File;
import java.io.FileOutputStream;
import java.io.PrintStream;
import com.pdflib.IpCOS;
import com.pdflib.cookbook.pcos.pcos_cookbook_example;
public class image_metadata extends pcos_cookbook_example {
/* This is where the data files are. Adjust as necessary. */
private final static String SEARCH_PATH = "../input";
public void example_code(IpCOS p, int doc) throws Exception {
String filename = p.pcos_get_string(doc, "filename");
System.out.println("File name: " + filename);
/*
* Loop over all images in the document and check whether there is a
* Metadata stream attached. If a Metadata stream is found, the contents
* are dumped to a file.
*/
int imagecount = (int) p.pcos_get_number(doc, "length:images");
for (int i = 0; i < imagecount; i += 1) {
String image_path = "images[" + i + "]/Metadata";
String objtype = p.pcos_get_string(doc, "type:" + image_path);
if (objtype.equals("stream")) {
xmp_dump(p, doc, filename, i, image_path);
}
}
}
private void xmp_dump(IpCOS p, int doc, String filename, int i,
String image_path) throws Exception {
/*
* Strip relative pathname and ".pdf" suffix from input filename.
*/
File path = new File(filename);
String basename = strip_suffix(path.getName());
/*
* Create an output filename that has blanks and forward slashes
* replaced with underscores
*/
String output_filename = (basename + "_" + image_path + ".txt")
.replaceAll("[ \\/]", "_");
System.out.println("Writing metadata of image " + i + " to file \""
+ output_filename + "\" ...");
byte[] contents = p.pcos_get_stream(doc, "", image_path);
PrintStream output_file = new PrintStream(new FileOutputStream(
output_filename));
output_file.write(contents);
output_file.close();
}
private String strip_suffix(String filename) {
int dot_index = filename.lastIndexOf('.');
return dot_index > 0 ? filename.substring(0, dot_index) : filename;
}
public image_metadata(String[] argv, String readable_name,
String search_path) {
super(argv, readable_name, search_path);
}
public static void main(String argv[]) {
image_metadata example = new image_metadata(argv, "Image XMP metadata",
SEARCH_PATH);
example.execute();
}
}