PjArray


1   package com.etymon.pj.object;
2   
3   import java.io.*;
4   import java.util.*;
5   import com.etymon.pj.*;
6   
7   /**
8      A representation of the PDF array type.
9      @author Nassib Nassar
10  */
11  public class PjArray
12      extends PjObject {
13  
14      /**
15         Creates an empty array.
16      */
17      public PjArray() {
18          _v = new Vector();
19      }
20  
21      /**
22         Creates an array as a wrapper around a Vector.
23         @param v the Vector to use for this array.
24      */
25      public PjArray(Vector v) {
26          _v = v;
27      }
28  
29      /**
30         Returns the Vector used to represent this array.
31         @return the Vector used to represent this array.
32      */
33      public Vector getVector() {
34          return _v;
35      }
36  
37      /**
38         Writes this array to a stream in PDF format.
39         @param os the stream to write to.
40         @return the number of bytes written.
41         @exception IOException if an I/O error occurs.
42       */
43      public long writePdf(OutputStream os) throws IOException {
44          long z = writeln(os, "[");
45          int size = _v.size();
46          for (int x = 0; x < size; x++) {
47              z = z + ((PjObject)(_v.elementAt(x))).writePdf(os);
48              z = z + writeln(os, "");
49          }
50          z = z + write(os, "]");
51          return z;
52      }
53  
54      /**
55         Returns a deep copy of this object.
56         @return a deep copy of this object.
57         @exception CloneNotSupportedException if the instance can not be cloned.
58      */
59      public Object   clone() throws CloneNotSupportedException   {
60          return new PjArray(cloneVector());
61      }
62  
63      protected Vector cloneVector() throws CloneNotSupportedException   {
64          Vector v = new Vector(_v.size());
65          Enumeration m = _v.elements();
66          while (m.hasMoreElements()) {
67              Object   value = m.nextElement();
68              if (value instanceof PjObject) {
69                  v.addElement(((PjObject)value).clone());
70              } else {
71                  throw new CloneNotSupportedException  ("Object in array is not a PjObject.");
72              }
73          }
74          return v;
75      }
76      
77      /**
78         Renumbers object references within this object.  This
79         method calls itself recursively to comprehensively renumber
80         all objects contained within this object.
81         @param map the table of object number mappings.  Each
82         object number is looked up by key in the hash table, and
83         the associated value is assigned as the new object number.
84         The map hash table should consist of PjNumber keys and
85         PjReference values.
86      */
87      public void renumber(Hashtable map) {
88          PjObject obj;
89          Object   r;
90          int size = _v.size();
91          for (int x = 0; x < size; x++) {
92              try {
93                  obj = (PjObject)(_v.elementAt(x));
94                  if (obj instanceof PjReference) {
95                      r = map.get(((PjReference)obj).getObjNumber());
96                      if (r != null) {
97                          _v.setElementAt(r, x);
98                      }
99                  } else {
100                     obj.renumber(map);
101                 }
102             }
103             catch (ClassCastException   e) {
104                 // ignore bad objects
105             }
106         }
107     }
108     
109     protected Vector _v;
110     
111 }
112
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