BaseObject


1   package com.etymon.pj.object;
2   
3   import java.io.*;
4   import java.util.*;
5   import com.etymon.pj.*;
6   
7   /**
8      The base class for all high level objects and page markings.
9      @author Nassib Nassar
10  */
11  public abstract class BaseObject
12      implements Cloneable   {
13  
14      /**
15         Returns a deep copy of this object.
16         @return a deep copy of this object.
17         @exception CloneNotSupportedException if the instance can not be cloned.
18      */
19      public abstract Object   clone() throws CloneNotSupportedException  ;
20      
21      /**
22         Writes this object to a file in PDF format.
23         @param raf the file to write to.
24         @return the number of bytes written.
25         @exception IOException if an I/O error occurs.
26       */
27      public abstract long writePdf(OutputStream os) throws
28          IOException;
29  
30      /**
31         Writes a char to a stream.
32         @param os the stream to write to.
33         @param c the character to write.
34         @return the number of bytes written.
35         @exception IOException if an I/O error occurs.
36      */
37      public static long write(OutputStream os, char c)
38          throws IOException {
39          os.write((int)c);
40          return 1;
41      }
42      
43      /**
44         Writes a byte[] to a stream.
45         @param os the stream to write to.
46         @param b the byte[] to write.
47         @return the number of bytes written.
48         @exception IOException if an I/O error occurs.
49      */
50      public static long write(OutputStream os, byte[] b)
51          throws IOException {
52          os.write(b);
53          return b.length;
54      }
55      
56      /**
57         Writes an Object to a stream.
58         @param os the stream to write to.
59         @param obj the Object to write.
60         @return the number of bytes written.
61         @exception IOException if an I/O error occurs.
62      */
63      public static long write(OutputStream os, Object   obj)
64          throws IOException {
65          return write(os, obj.toString().getBytes());
66      }
67  
68      /**
69         Writes an Object to a stream followed by a carriage return.
70         @param os the stream to write to.
71         @param obj the Object to write.
72         @return the number of bytes written.
73         @exception IOException if an I/O error occurs.
74      */
75      public static long writeln(OutputStream os, Object   obj)
76          throws IOException {
77          return write(os, obj) + write(os, PjConst.PDF_EOL);
78      }
79  
80      /**
81         Returns a string representation of this object in PDF format.
82         @return the string representation.
83       */
84      public String   toString() {
85          ByteArrayOutputStream baos = new ByteArrayOutputStream();
86          try {
87              writePdf(baos);
88          }
89          catch (IOException e) {
90              return null;
91          }
92          return baos.toString();
93      }
94  
95  }
96
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