/*
* GeoTools - The Open Source Java GIS Toolkit
* http://geotools.org
*
* (C) 2002-2008, Open Source Geospatial Foundation (OSGeo)
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation;
* version 2.1 of the License.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*/
package org.geotools.xml.impl.jxpath;
import org.apache.commons.jxpath.ri.QName;
import org.apache.commons.jxpath.ri.model.NodePointer;
import org.opengis.feature.simple.SimpleFeature;
/**
* Pointer to a single property of a feature.
* <p>
* THe property of the feature is specified via index. Setting the index to
* -1 will cause the pointer to point at the feature id.
* </p>
* @author Justin Deoliveira, The Open Planning Project
*
*
* @source $URL$
*/
public class FeaturePropertyPointer extends NodePointer {
/**
* the feature
*/
SimpleFeature feature;
/**
* The parent pointer
*/
FeaturePointer parent;
/**
* the indedx of hte property being pointed at
*/
int index;
/**
* Creates the pointer.
*
* @param parent The parent pointer, pointer at the feature.
* @param index The index of hte property to point to, or -1 to point
* to the feature id.
*/
public FeaturePropertyPointer(FeaturePointer parent, int index) {
super(parent);
this.index = index;
this.feature = (SimpleFeature) parent.getImmediateNode();
}
/**
* Return <code>true</code>.
*/
public boolean isLeaf() {
return true;
}
/**
* Return <code>false</code>.
*/
public boolean isCollection() {
return false;
}
/**
* Return <code>1</code>
*/
public int getLength() {
return 1;
}
/**
* Returns the qname with prefix as <code>null</code>, and local part the name of the
* feature attribute.
*/
public QName getName() {
return (index != -1)
? new QName(null, feature.getFeatureType().getDescriptor(index).getLocalName())
: new QName(null, "fid");
}
public Object getBaseValue() {
return feature;
}
public Object getImmediateNode() {
return (index != -1) ? feature.getAttribute(index) : feature.getID();
}
public void setValue(Object value) {
if (index == -1) {
return; //fids arent settable
}
try {
feature.setAttribute(index, value);
} catch (Exception e) {
throw new RuntimeException(e);
}
}
/**
* Always return <code>0</code>, can never have child pointers.
*/
public int compareChildNodePointers(NodePointer pointer1, NodePointer pointer2) {
return 0;
}
}