resourcecollection.html

Geotools是一个开源的Java GIS工具包,可利用它来开发符合标准的地理信息系统。Geotools提供了OGC(Open Geospatial Consortium)规范的一个实现来作为他们的

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<A NAME="iterator()"><!-- --></A><H3>
iterator</H3>
<PRE>
public <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/util/Iterator.html" title="class or interface in java.util">Iterator</A> <B>iterator</B>()</PRE>
<DL>
<DD>An iterator over this collection, which must be closeed after use.
 <p>
 Collection is not guarneteed to be ordered in any manner.
 </p>
 <p>
 The implementation of Collection must adhere to the rules of
 fail-fast concurrent modification. In addition (to allow for
 resource backed collections, the <code>close( Iterator )</code>
 method must be called.
 <p>
 </p>
 Example (safe) use:<pre><code>
 Iterator iterator = collection.iterator();
 try {
     while( iterator.hasNext();){
          Feature feature = (Feature) iterator.hasNext();
          System.out.println( feature.getID() );
     }
 }
 finally {
     collection.close( iterator );
 }
 </code></pre>
 </p>
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="http://java.sun.com/j2se/1.4/docs/api/java/util/Collection.html#iterator()" title="class or interface in java.util">iterator</A></CODE> in interface <CODE><A HREF="http://java.sun.com/j2se/1.4/docs/api/java/util/Collection.html" title="class or interface in java.util">Collection</A></CODE></DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>Iterator</DL>
</DD>
</DL>
<HR>

<A NAME="close(java.util.Iterator)"><!-- --></A><H3>
close</H3>
<PRE>
public void <B>close</B>(<A HREF="http://java.sun.com/j2se/1.4/docs/api/java/util/Iterator.html" title="class or interface in java.util">Iterator</A>&nbsp;close)</PRE>
<DL>
<DD>Clean up after any resources assocaited with this itterator in a manner similar to JDO collections.
 </p>
 Example (safe) use:<pre><code>
 Iterator iterator = collection.iterator();
 try {
     for( Iterator i=collection.iterator(); i.hasNext();){
          Feature feature = (Feature) i.hasNext();
          System.out.println( feature.getID() );
     }
 }
 finally {
     collection.close( iterator );
 }
 </code></pre>
 </p>
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>close</CODE> - </DL>
</DD>
</DL>
<HR>

<A NAME="purge()"><!-- --></A><H3>
purge</H3>
<PRE>
public void <B>purge</B>()</PRE>
<DL>
<DD>Close any outstanding resources released by this resources.
 <p>
 This method should be used with great caution, it is however available
 to allow the use of the ResourceCollection with algorthims that are
 unaware of the need to close iterators after use.
 </p>
 <p>
 Example of using a normal Collections utility method:<pre><code>
 Collections.sort( collection );
 collection.purge();
 </code></pre>
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