pbwest 2003/01/20 06:51:12
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PropertyConsts-class.html
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<h1>PropertyConsts Description</h1>
<p>
<font size="-2">by Peter B. West</font>
</p>
<ul class="minitoc">
<li>
<a href="#N10014">Introduction</a>
</li>
</ul>
<a name="N10014"></a>
<h3>Introduction</h3>
<p>
<a href="javascript:parent.displayCode(
'PropertyConsts.html#PropertyConstsClass'
)">This class</a>, and the singleton object which is <a
href="javascript:parent.displayCode(
'PropertyConsts.html#pconsts' )">generated by the static
initializer</a>, is essentially a repository of
<property> class instances and the static data from
those classes of <span
class="codefrag">org.apache.fop.fo.property</span>.
The heart of this class is the method <a href=
"javascript:parent.displayCode(
'PropertyConsts.html#setupProperty' )"><span class="codefrag"
>setupProperty</span ></a>. Whenever access to the data or
methods of a property class is required, this method in the
singleton must be called to ensure that an instance of the
property exists and that the static data from that instance
has been extracted.
</p>
<div class="frame note">
<div class="label">Note</div>
<div class="content">
An alternative to this requirement would be to pre-load all
of the individual property classes during the system
initialization phase. This is not done currently because of
the start-up expense of the required class loading for over
three hundred classes, and the relatively low added expense
of checking for the existence of a property instance before
every access. Given that FOP is increasingly used in a
server environment, it may prove acceptable in the long run
to change to pre-loading.
</div>
</div>
<p>
The class name is generated and stored in the <a
href="javascript:parent.displayCode(
'PropertyConsts.html#classNames' )"><span class="codefrag"
>classNames</span ></a> array; a class instance is generated
from the name and stored in the <a
href="javascript:parent.displayCode(
'PropertyConsts.html#classes' )"><span class="codefrag"
>classes</span ></a> array; and an instance of the class is
generated from the class object and stored in the <a
href="javascript:parent.displayCode(
'PropertyConsts.html#properties' )"><span class="codefrag"
>properties</span ></a> array.
</p>
<p>
The other data gathering facilities and access methods of this
class will be examined in conjunction with the various types
of property classes.
</p>
<p>
<strong>Previous:</strong> <a href = "classes-overview.html"
>Property classes overview</a>
</p>
<p>
<strong>Next:</strong> <a href= "simple-properties.html"
>Simple property classes</a>
</p>
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