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54 | <H2><A NAME="SECTION0014140000000000000000"></A><A NAME="writer-impls"></A> | |
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56 | 12.1.4 Writer Implementations | |
57 | </H2> | |
58 | ||
59 | <P> | |
60 | Three implementations of the writer object interface are provided as | |
61 | examples by this module. Most applications will need to derive new | |
62 | writer classes from the <tt class="class">NullWriter</tt> class. | |
63 | ||
64 | <P> | |
65 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"> | |
66 | <td><nobr><b><span class="typelabel">class</span> <tt id='l2h-3824' xml:id='l2h-3824' class="class">NullWriter</tt></b>(</nobr></td> | |
67 | <td><var></var>)</td></tr></table></dt> | |
68 | <dd> | |
69 | A writer which only provides the interface definition; no actions are | |
70 | taken on any methods. This should be the base class for all writers | |
71 | which do not need to inherit any implementation methods. | |
72 | </dl> | |
73 | ||
74 | <P> | |
75 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"> | |
76 | <td><nobr><b><span class="typelabel">class</span> <tt id='l2h-3825' xml:id='l2h-3825' class="class">AbstractWriter</tt></b>(</nobr></td> | |
77 | <td><var></var>)</td></tr></table></dt> | |
78 | <dd> | |
79 | A writer which can be used in debugging formatters, but not much | |
80 | else. Each method simply announces itself by printing its name and | |
81 | arguments on standard output. | |
82 | </dl> | |
83 | ||
84 | <P> | |
85 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"> | |
86 | <td><nobr><b><span class="typelabel">class</span> <tt id='l2h-3826' xml:id='l2h-3826' class="class">DumbWriter</tt></b>(</nobr></td> | |
87 | <td><var></var><big>[</big><var>file</var><big>[</big><var>, maxcol<code> = 72</code></var><big>]</big><var></var><big>]</big><var></var>)</td></tr></table></dt> | |
88 | <dd> | |
89 | Simple writer class which writes output on the file object passed in | |
90 | as <var>file</var> or, if <var>file</var> is omitted, on standard output. The | |
91 | output is simply word-wrapped to the number of columns specified by | |
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