datafeaturecollection.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

<DT><B>Returns:</B><DD>Iterator, should be closed closeIterator</DL>
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<A NAME="close(org.geotools.feature.FeatureIterator)"><!-- --></A><H3>
close</H3>
<PRE>
public void <B>close</B>(<A HREF="../../../../org/geotools/feature/FeatureIterator.html" title="interface in org.geotools.feature">FeatureIterator</A>&nbsp;iterator)</PRE>
<DL>
<DD><B>Description copied from interface: <CODE><A HREF="../../../../org/geotools/feature/FeatureCollection.html" title="interface in org.geotools.feature">FeatureCollection</A></CODE></B></DD>
<DD>Clean up any resources assocaited with this iterator in a manner similar to JDO collections.
 <p>
 You must be sure to allow null values, this is because in a try/finally
 block client code may not be sure if they have actualy succeed in
 assign a value to an iterator they wish to ensure is closed.
 By permiting null as an api we prevent a null check in lots of finally
 statements.
 </p>
 <p>
 Note: Because of FeatureReader using an interator internally,
 there is only one implementation of this method that makes
 any sense:<pre><code>
 <b>public void</b> close( FeatureIterator iterator) {
     <b>if</b>( iterator != null ) iterator.close();
 }
 </code></pre>
 </p>
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../org/geotools/feature/FeatureCollection.html#close(org.geotools.feature.FeatureIterator)">close</A></CODE> in interface <CODE><A HREF="../../../../org/geotools/feature/FeatureCollection.html" title="interface in org.geotools.feature">FeatureCollection</A></CODE></DL>
</DD>
<DD><DL>
</DL>
</DD>
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<A NAME="close(java.util.Iterator)"><!-- --></A><H3>
close</H3>
<PRE>
public final 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><B>Description copied from interface: <CODE><A HREF="../../../../org/geotools/feature/FeatureCollection.html" title="interface in org.geotools.feature">FeatureCollection</A></CODE></B></DD>
<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>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../org/geotools/feature/FeatureCollection.html#close(java.util.Iterator)">close</A></CODE> in interface <CODE><A HREF="../../../../org/geotools/feature/FeatureCollection.html" title="interface in org.geotools.feature">FeatureCollection</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>close</CODE> - </DL>
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<A NAME="closeIterator(java.util.Iterator)"><!-- --></A><H3>
closeIterator</H3>
<PRE>
protected void <B>closeIterator</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>
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<DD><DL>
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<A NAME="size()"><!-- --></A><H3>
size</H3>
<PRE>
public int <B>size</B>()</PRE>
<DL>
<DD>Default implementation based on getCount() - this may be expensive
<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#size()" title="class or interface in java.util">size</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>
</DL>
</DD>
</DL>
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<A NAME="purge()"><!-- --></A><H3>
purge</H3>
<PRE>
public void <B>purge</B>()</PRE>
<DL>
<DD><B>Description copied from interface: <CODE><A HREF="../../../../org/geotools/data/collection/ResourceCollection.html" title="interface in org.geotools.data.collection">ResourceCollection</A></CODE></B></DD>
<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>
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../org/geotools/data/collection/ResourceCollection.html#purge()">purge</A></CODE> in interface <CODE><A HREF="../../../../org/geotools/data/collection/ResourceCollection.html" title="interface in org.geotools.data.collection">ResourceCollection</A></CODE></DL>
</DD>
<DD><DL>
</DL>
</DD>
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<A NAME="isEmpty()"><!-- --></A><H3>
isEmpty</H3>
<PRE>
public boolean <B>isEmpty</B>()</PRE>
<DL>
<DD>Default implementation based on creating an reader, testing hasNext, and closing.
 <p>
 For once the Collections API does not give us an escape route, we *have* to check the data.
 </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#isEmpty()" title="class or interface in java.util">isEmpty</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>
</DL>
</DD>
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<A NAME="contains(java.lang.Object)"><!-- --></A><H3>
contains</H3>
<PRE>
public boolean <B>contains</B>(<A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A>&nbsp;o)</PRE>
<DL>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="http://java.sun.com/j2se/1.4/docs/api/java/util/Collection.html#contains(java.lang.Object)" title="class or interface in java.util">contains</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>
</DL>
</DD>
</DL>
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<A NAME="toArray()"><!-- --></A><H3>
toArray</H3>
<PRE>
public <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A>[] <B>toArray</B>()</PRE>
<DL>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="http://java.sun.com/j2se/1.4/docs/api/java/util/Collection.html#toArray()" title="class or interface in java.util">toArray</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>
</DL>
</DD>
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<A NAME="toArray(java.lang.Object[])"><!-- --></A><H3>
toArray</H3>
<PRE>
public <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A>[] <B>toArray</B>(<A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A>[]&nbsp;arg0)</PRE>
<DL>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="http://java.sun.com/j2se/1.4/docs/api/java/util/Collection.html#toArray(java.lang.Object[])" title="class or interface in java.util">toArray</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>
</DL>
</DD>
</DL>
<HR>

<A NAME="add(java.lang.Object)"><!-- --></A><H3>
add</H3>
<PRE>
public boolean <B>add</B>(<A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A>&nbsp;arg0)</PRE>
<DL>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="http://java.sun.com/j2se/1.4/docs/api/java/util/Collection.html#add(java.lang.Object)" title="class or interface in java.util">add</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>
</DL>
</DD>
</DL>
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<A NAME="remove(java.lang.Object)"><!-- --></A><H3>
remove</H3>
<PRE>
public boolean <B>remove</B>(<A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A>&nbsp;arg0)</PRE>
<DL>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="http://java.sun.com/j2se/1.4/docs/api/java/util/Collection.html#remove(java.lang.Object)" title="class or interface in java.util">remove</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>
</DL>
</DD>
</DL>
<HR>

<A NAME="containsAll(java.util.Collection)"><!-- --></A><H3>
containsAll</H3>
<PRE>
public boolean <B>containsAll</B>(<A HREF="http://java.sun.com/j2se/1.4/docs/api/java/util/Collection.html" title="class or interface in java.util">Collection</A>&nbsp;arg0)</PRE>
<DL>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="http://java.sun.com/j2se/1.4/docs/api/java/util/Collection.html#containsAll(java.util.Collection)" title="class or interface in java.util">containsAll</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>
</DL>
</DD>
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<HR>

<A NAME="addAll(java.util.Collection)"><!-- --></A><H3>
addAll</H3>
<PRE>
public boolean <B>addAll</B>(<A HREF="http://java.sun.com/j2se/1.4/docs/api/java/util/Collection.html" title="class or interface in java.util">Collection</A>&nbsp;arg0)</PRE>
<DL>
<DD>Optimized implementation of addAll that recognizes the
 use of collections obtained with subCollection( filter ).
 <p>
 This method is constructed by either:
 <ul>
 <li>Filter OR
 <li>Removing an extact match of Filter AND
 </ul>
<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#addAll(java.util.Collection)" title="class or interface in java.util">addAll</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>
</DL>
</DD>
</DL>
<HR>

<A NAME="removeAll(java.util.Collection)"><!-- --></A><H3>
removeAll</H3>
<PRE>
public boolean <B>removeAll</B>(<A HREF="http://java.sun.com/j2se/1.4/docs/api/java/util/Collection.html" title="class or interface in java.util">Collection</A>&nbsp;arg0)</PRE>
<DL>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="http://java.sun.com/j2se/1.4/docs/api/java/util/Collection.html#removeAll(java.util.Collection)" title="class or interface in java.util">removeAll</A></CODE> in interface <CODE><A HREF="http://java.sun.com/j2se/1.4/docs/api/