/*
 * Query block color:
 * Query the background color of blocks
 * 
 * Import a page containing blocks and query the background color space and 
 * color of all blocks.
 *
 * Required software: PPS 9
 * Required data: PDF document with blocks
 */
package com.pdflib.cookbook.pdflib.blocks;

import java.text.NumberFormat;
import java.util.*;

import com.pdflib.pdflib;
import com.pdflib.PDFlibException;

public class query_block_color
{
    public static void main (String argv[])
    {
    /* This is where the data files are. Adjust as necessary. */
    String searchpath = "../input";
    String outfile = "query_block_color.pdf";
    String title = "Query Block Color";

    pdflib p = null;
    String infile = "blocks_bgcolor.pdf";
    int exitcode = 0;
    
    String colorspace, path, blockname, type, textbuf;
    int i, j, font, page, indoc, blockcount;
    int x = 30, y = 750, yoff = 30, ncomp = 1;
    double comp;
    NumberFormat form = NumberFormat.getInstance(Locale.US);
    
    try {
        p = new pdflib();

        p.set_option("searchpath={" + searchpath + "}");

        /* This means we must check return values of load_font() etc. */
        p.set_option("errorpolicy=return");

        if (p.begin_document(outfile, "") == -1)
        throw new Exception("Error: " + p.get_errmsg());

        p.set_info("Creator", "PDFlib Cookbook");
        p.set_info("Title", title);
        
        /* Load the font */
        font = p.load_font("Helvetica", "unicode", "");

        if (font == -1)
        throw new Exception("Error: " + p.get_errmsg());
        
        /* Open a PDF containing blocks */
        indoc = p.open_pdi_document(infile, "");
        if (indoc == -1)
        throw new Exception("Error: " + p.get_errmsg());

        /* Open the first input page */
        page = p.open_pdi_page(indoc, 1, "");
        if (page == -1)
        throw new Exception("Error: " + p.get_errmsg());

        /* Start the first output page */
        p.begin_page_ext(0, 0, "width=a4.width height=a4.height");
        
        /* Set the font with a font size of 14 */
        p.setfont(font, 14);
        
        /* Set the number of fraction digits to 2 */
        form.setMaximumFractionDigits(2);
        form.setMinimumFractionDigits(2);
          
        /* Get the number of blocks on the page */
        blockcount = (int) p.pcos_get_number(indoc, "length:pages[0]/blocks");

        if (blockcount == 0)
        throw new Exception("Error: " + infile +
            "does not contain any PDFlib blocks");

        
        /* -------------------------------------------------------------------
         * Query the background color space and color of all blocks. The color
         * space can be DeviceGray, DeviceRGB, DeviceCMYK, Separation, or Lab.
         * -------------------------------------------------------------------
         */
        
        for (i = 0; i < blockcount; i++) 
        {
        /* Retrieve the block name */
        blockname = p.pcos_get_string(indoc,
            "pages[0]/blocks[" + i + "]/Name");
        
        /* Output the block name */
        textbuf = "Background color of \"" + blockname + "\" is:";
        p.fit_textline(textbuf,x, y-=yoff, "");
      
        /* Set the pCOS path for the background color */
        path = "pages[0]/blocks[" + i + "]/backgroundcolor";
        
        type = p.pcos_get_string(indoc, "type:" + path);
               
        /* Check, if a background color is available */
        if (type.equals("null")) {
            textbuf = "not available";   
        }
        else if (type.equals("array")) {
            /* Get the path type */
            type = p.pcos_get_string(indoc, "type:" + path + "[0]");
            
            /* Check for DeviceGray, DeviceRGB, or DeviceCMYK color space */
            if (type.equals("name")) {
            colorspace = p.pcos_get_string(indoc, path + "[0]");
                    
            textbuf = colorspace + " ";
        
            if (colorspace.equals("DeviceGray"))
                ncomp = 1;
            else if (colorspace.equals("DeviceRGB"))
                ncomp = 3;
            else if (colorspace.equals("DeviceCMYK"))
                ncomp = 4;
            else
                throw new Exception("Unknown color space");
            }
            else if (type.equals("array")){
            /* Check for Separation or Lab color space; in these cases 
             * the color space itself is an array
             */ 
            colorspace = p.pcos_get_string(indoc, path + "[0][0]"); 
        
            textbuf = colorspace + " ";
            
            if (colorspace.equals("Separation")) {
                String name = p.pcos_get_string(indoc, path + "[0][1]");
                textbuf = textbuf + "\"" + name + "\"" + " ";
                ncomp = 1;
            }
            else if (colorspace.equals("Lab"))
                ncomp = 3;
            else 
                throw new Exception("Unknown color space");
            }
            else {
            throw new Exception("Unknown color space");
            }
                
            /* Get one or more color components */
            if (ncomp == 1) {
            comp = p.pcos_get_number(indoc, path + "[1]");
            textbuf = textbuf + form.format(comp);
            }
            else
            {
            textbuf = textbuf + " [";
            for (j = 0; j < ncomp; ++j) {
                comp = 
                p.pcos_get_number(indoc, path + "[1][" + j + "]");
                textbuf = textbuf + " " + form.format(comp) + " ";
            }
            textbuf = textbuf + "]";
            }
        }
        else {
            throw new Exception("Unknown color space");
        }
                
        /* Output the color space and color of the block */
        p.fit_textline(textbuf, x, y-=yoff, "fillcolor={rgb 0.2 0.4 0.7}");
        
        } /* for */
        p.end_page_ext("");
          
        p.close_pdi_page(page);

        p.end_document("");
        p.close_pdi_document(indoc);

        } catch (PDFlibException e) {
            System.err.println("PDFlib exception occurred:");
            System.err.println("[" + e.get_errnum() + "] " + e.get_apiname() +
                ": " + e.get_errmsg());
        exitcode = 1;
        } catch (Exception e) {
            System.err.println(e.toString());
        exitcode = 1;
        } finally {
            if (p != null) {
                p.delete();
            }
        System.exit(exitcode);
        }
    }
}