MergeSample


1   package it.stefanochizzolini.clown.samples;
2   
3   import it.stefanochizzolini.clown.bytes.FileInputStream;
4   import it.stefanochizzolini.clown.bytes.IInputStream;
5   import it.stefanochizzolini.clown.documents.Document;
6   import it.stefanochizzolini.clown.documents.Page;
7   import it.stefanochizzolini.clown.documents.Pages;
8   import it.stefanochizzolini.clown.files.File;
9   import it.stefanochizzolini.clown.tokens.FileFormatException;
10  
11  import java.io.RandomAccessFile  ;
12  import java.util.Collection  ;
13  
14  /**
15    This sample demonstrates how to merge two documents into a unique one.
16    <h3>Remarks</h3>
17    <p>This implementation is based on the <b>contextual cloning</b> functionality
18    of PDF Clown which allows to transparently and intuitively import contents from
19    one document to another.</p>
20  */
21  public class MergeSample
22    implements ISample
23  {
24    public void run(
25      PDFClownSampleLoader loader
26      )
27    {
28      /*
29        NOTE: This procedure is made up of this sequence of actions:
30        1. User choice.
31        2. Document editing (core).
32        3. Serialization.
33      */
34  
35      // 1. User choice.
36      String   mainFilePath = loader.getPdfFileChoice("Please select main PDF file");
37      String   secondaryFilePath = loader.getPdfFileChoice("Please select secondary PDF file");
38  
39      // 2. Document editing.
40      // Opening the PDF files...
41      // Main file.
42      File mainFile;
43      try
44      {
45        mainFile = new File(
46          new FileInputStream(
47            new RandomAccessFile  (mainFilePath,"r")
48            )
49          );
50      }
51      catch(FileFormatException e)
52      {throw new RuntimeException  (mainFilePath + " file has a bad file format.",e);}
53      catch(Exception   e)
54      {throw new RuntimeException  (mainFilePath + " file access error.",e);}
55  
56      // Secondary file.
57      File secondaryFile;
58      try
59      {
60        secondaryFile = new File(
61          new FileInputStream(
62            new RandomAccessFile  (secondaryFilePath,"r")
63            )
64          );
65      }
66      catch(FileFormatException e)
67      {throw new RuntimeException  (secondaryFilePath + " file has a bad file format.",e);}
68      catch(Exception   e)
69      {throw new RuntimeException  (secondaryFilePath + " file access error.",e);}
70  
71      // Get the PDF documents!
72      Document mainDocument = mainFile.getDocument();
73      Pages mainPages = mainDocument.getPages();
74      Document secondaryDocument = secondaryFile.getDocument();
75  
76      // Append the secondary document's pages to the main document!
77      /*
78        NOTE: To be added to an alien document,
79        pages MUST be firstly contextualized within it,
80        then added to the target pages collection.
81      */
82      mainPages.addAll(
83        (Collection  <Page>)mainDocument.contextualize(
84          (Collection  <Page>)secondaryDocument.getPages()
85          )
86        );
87      mainPages.update(); // Fundamental to override original page collection.
88  
89      // 3. Serialization.
90      loader.serialize(mainFile,this.getClass().getSimpleName());
91    }
92  }
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