vpffeaturetype.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>Namespace of schema</DL>
</DD>
</DL>
<HR>

<A NAME="getTypeName()"><!-- --></A><H3>
getTypeName</H3>
<PRE>
public <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/String.html" title="class or interface in java.lang">String</A> <B>getTypeName</B>()</PRE>
<DL>
<DD><B>Description copied from interface: <CODE><A HREF="../../../../org/geotools/feature/FeatureType.html" title="interface in org.geotools.feature">FeatureType</A></CODE></B></DD>
<DD>Gets the type name for this schema.
 <p>
 In GML this must be the element name of the Feature.
 </p>
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../org/geotools/feature/FeatureType.html#getTypeName()">getTypeName</A></CODE> in interface <CODE><A HREF="../../../../org/geotools/feature/FeatureType.html" title="interface in org.geotools.feature">FeatureType</A></CODE></DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>The name of this feature type.</DL>
</DD>
</DL>
<HR>

<A NAME="hasAttributeType(java.lang.String)"><!-- --></A><H3>
hasAttributeType</H3>
<PRE>
public boolean <B>hasAttributeType</B>(<A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/String.html" title="class or interface in java.lang">String</A>&nbsp;xPath)</PRE>
<DL>
<DD><B>Description copied from interface: <CODE><A HREF="../../../../org/geotools/feature/FeatureType.html" title="interface in org.geotools.feature">FeatureType</A></CODE></B></DD>
<DD>This is only used twice in the whole geotools code base, and one of those is for a test, so
 we're removing it from the interface. If getAttributeType does not have the AttributeType it
 will just return null. Gets the number of occurrences of this attribute.
 <p>
 Question: the comment says we are removing this, but it is not depricated? And how the heck
 can the number of occurances out of a boolean.
 </p>
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../org/geotools/feature/FeatureType.html#hasAttributeType(java.lang.String)">hasAttributeType</A></CODE> in interface <CODE><A HREF="../../../../org/geotools/feature/FeatureType.html" title="interface in org.geotools.feature">FeatureType</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>xPath</CODE> - XPath pointer to attribute type.
<DT><B>Returns:</B><DD>Number of occurrences.</DL>
</DD>
</DL>
<HR>

<A NAME="isAbstract()"><!-- --></A><H3>
isAbstract</H3>
<PRE>
public boolean <B>isAbstract</B>()</PRE>
<DL>
<DD><B>Description copied from interface: <CODE><A HREF="../../../../org/geotools/feature/FeatureType.html" title="interface in org.geotools.feature">FeatureType</A></CODE></B></DD>
<DD>Is this FeatureType an abstract type?
 <p>
 When true is returned instances of this Feature cannot be created, instead a child
 FeatureType must use this FeatureType as its ancestor.
 </p>
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../org/geotools/feature/FeatureType.html#isAbstract()">isAbstract</A></CODE> in interface <CODE><A HREF="../../../../org/geotools/feature/FeatureType.html" title="interface in org.geotools.feature">FeatureType</A></CODE></DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>true if abstract, false otherwise.</DL>
</DD>
</DL>
<HR>

<A NAME="isDescendedFrom(org.geotools.feature.FeatureType)"><!-- --></A><H3>
isDescendedFrom</H3>
<PRE>
public boolean <B>isDescendedFrom</B>(<A HREF="../../../../org/geotools/feature/FeatureType.html" title="interface in org.geotools.feature">FeatureType</A>&nbsp;type)</PRE>
<DL>
<DD><B>Description copied from interface: <CODE><A HREF="../../../../org/geotools/feature/FeatureType.html" title="interface in org.geotools.feature">FeatureType</A></CODE></B></DD>
<DD>A convenience method for calling <br>
 <code><pre>
 FeatureType f1;
 FeatureType f2;
 f1.isDescendedFrom(f2.getNamespace(), f2.getName());
 </pre></code>
 <p>
 Question: this method duplicates the information provided by getAncestors().
 </p>
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../org/geotools/feature/FeatureType.html#isDescendedFrom(org.geotools.feature.FeatureType)">isDescendedFrom</A></CODE> in interface <CODE><A HREF="../../../../org/geotools/feature/FeatureType.html" title="interface in org.geotools.feature">FeatureType</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>type</CODE> - The type to compare to.
<DT><B>Returns:</B><DD>true if descendant, false otherwise.</DL>
</DD>
</DL>
<HR>

<A NAME="isDescendedFrom(java.net.URI, java.lang.String)"><!-- --></A><H3>
isDescendedFrom</H3>
<PRE>
public boolean <B>isDescendedFrom</B>(<A HREF="http://java.sun.com/j2se/1.4/docs/api/java/net/URI.html" title="class or interface in java.net">URI</A>&nbsp;nsURI,
                               <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/String.html" title="class or interface in java.lang">String</A>&nbsp;typeName)</PRE>
<DL>
<DD><B>Description copied from interface: <CODE><A HREF="../../../../org/geotools/feature/FeatureType.html" title="interface in org.geotools.feature">FeatureType</A></CODE></B></DD>
<DD>Test to determine whether this FeatureType is descended from the given FeatureType. Think of
 this relationship likes the "extends" relationship in java.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../org/geotools/feature/FeatureType.html#isDescendedFrom(java.net.URI, java.lang.String)">isDescendedFrom</A></CODE> in interface <CODE><A HREF="../../../../org/geotools/feature/FeatureType.html" title="interface in org.geotools.feature">FeatureType</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>nsURI</CODE> - The namespace URI to use.<DD><CODE>typeName</CODE> - The typeName.
<DT><B>Returns:</B><DD>true if descendant, false otherwise.</DL>
</DD>
</DL>
<HR>

<A NAME="getFaccCode()"><!-- --></A><H3>
getFaccCode</H3>
<PRE>
public <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/String.html" title="class or interface in java.lang">String</A> <B>getFaccCode</B>()</PRE>
<DL>
<DD>The FACC code, a two-letter, 3-number code
 identifying the feature type
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>Returns the FACC Code.</DL>
</DD>
</DL>
<HR>

<A NAME="find(java.lang.String)"><!-- --></A><H3>
find</H3>
<PRE>
public int <B>find</B>(<A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/String.html" title="class or interface in java.lang">String</A>&nbsp;attName)</PRE>
<DL>
<DD><B>Description copied from interface: <CODE><A HREF="../../../../org/geotools/feature/FeatureType.html" title="interface in org.geotools.feature">FeatureType</A></CODE></B></DD>
<DD>Find the position of an AttributeType which matches the given String.
 <p>
 This index may be used with getAttributeType( index ), the search space is the entire schema
 defined by this FeatureType and its ancestors.
 </p>
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../org/geotools/feature/FeatureType.html#find(java.lang.String)">find</A></CODE> in interface <CODE><A HREF="../../../../org/geotools/feature/FeatureType.html" title="interface in org.geotools.feature">FeatureType</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>attName</CODE> - the name to look for
<DT><B>Returns:</B><DD>-1 if not found, zero-based index otherwise</DL>
</DD>
</DL>
<HR>

<A NAME="equals(java.lang.Object)"><!-- --></A><H3>
equals</H3>
<PRE>
public boolean <B>equals</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;obj)</PRE>
<DL>
<DD><B>Description copied from interface: <CODE><A HREF="../../../../org/geotools/feature/FeatureType.html" title="interface in org.geotools.feature">FeatureType</A></CODE></B></DD>
<DD>FeatureType check based on namespace, typeName, attributes and ancestors.
 <p>
 Conceptually FeatureType equality is supped to indicate an exact match based AttributeType
 and Ancestors. The geotools models includes additional information of namespace
 and typename.
 </p>
 <p>
 As far as the geotools data model is concerned any FeatureType implementation should be able
 to be subsituted for another. (An actually application may provided an implementation that
 provdes tracking of metadata such as creation history, or support for additional interfaces).
 </p>
 <p>
 Required implementation:<pre><code>
 </code></pre>
 A sample implementation is provided in FeatureTypes.equals( FeatureType, FeatureType ).
 </p>
 <p>
 Questions:
 <br>Q: You may wonder why namespace and typeName are not enought?
 <br>A: Geotools often returns a "limitied" schema in response to a query where only a subset
 of the attributes are requested.
 <br>Q: Doesn't that still indicate the same schema?
 <br>A: Yes it kind of should, a GML application (such as GeoServer) has to actually follow the
 application schema and include attributes required by the schema (but not request by the query).
 This library is more lax in its treatment, and expects you to uses isDecendedFrom as required.
 </p>
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../org/geotools/feature/FeatureType.html#equals(java.lang.Object)">equals</A></CODE> in interface <CODE><A HREF="../../../../org/geotools/feature/FeatureType.html" title="interface in org.geotools.feature">FeatureType</A></CODE></DL>
</DD>
<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="hashCode()"><!-- --></A><H3>
hashCode</H3>
<PRE>
public int <B>hashCode</B>()</PRE>
<DL>
<DD><B>Description copied from interface: <CODE><A HREF="../../../../org/geotools/feature/FeatureType.html" title="interface in org.geotools.feature">FeatureType</A></CODE></B></DD>
<DD>Hascode based on namespace, typeName, attributes and ancestors.
 <p>
 Hascode is always a matched set with an equals implementation, please see the javadocs
 for equals for a detailed discussion.
 </p>
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../org/geotools/feature/FeatureType.html#hashCode()">hashCode</A></CODE> in interface <CODE><A HREF="../../../../org/geotools/feature/FeatureType.html" title="interface in org.geotools.feature">FeatureType</A></CODE></DL>
</DD>
<DD><DL>
</DL>
</DD>
</DL>
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