/*
* uDig - User Friendly Desktop Internet GIS client
* http://udig.refractions.net
* (C) 2012, Refractions Research Inc.
*
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* (http://www.eclipse.org/legal/epl-v10.html), and the Refractions BSD
* License v1.0 (http://udig.refractions.net/files/bsd3-v10.html).
*/
package org.locationtech.udig.project.internal.interceptor;
import org.locationtech.udig.project.interceptor.FeatureInterceptor;
import org.opengis.feature.Feature;
import org.opengis.feature.Property;
import org.opengis.feature.simple.SimpleFeature;
import org.opengis.feature.simple.SimpleFeatureType;
import org.opengis.feature.type.AttributeDescriptor;
import org.opengis.feature.type.PropertyDescriptor;
/**
* Used to fill in default values from attribute descriptor.
*
* @author Jody
* @since 1.2.0
*/
public class DefaultValueFeatureInterceptor implements FeatureInterceptor {
public void run( Feature feature ) {
if( feature instanceof SimpleFeature ){
SimpleFeatureType type = (SimpleFeatureType) feature.getType();
SimpleFeature simpleFeature = (SimpleFeature) feature;
for( int i = 0; i < type.getAttributeCount(); i++ ) {
if( simpleFeature.getAttribute(i) == null ){
Object value = toDefaultValue(type.getDescriptor(i));
simpleFeature.setAttribute(i, value );
}
}
}
else {
for( Property property : feature.getProperties() ){
Object defaultValue = toDefaultValue( property.getDescriptor() );
property.setValue( defaultValue );
}
}
}
/**
* Retrieves a default value for the provided descriptor.
* <p>
* The descriptor getDefaultValue() is used if available; if not
* a default value is created base on the descriptor binding. The default
* values mirror those used by Java; empty string, boolean false, 0 integer, 0.0 double, etc...
* >p>
* @param type attribute descriptor
*/
private Object toDefaultValue( PropertyDescriptor descriptor ) {
Object value = null;
if( descriptor instanceof AttributeDescriptor ){
AttributeDescriptor attributeDescriptor = (AttributeDescriptor) descriptor;
value = attributeDescriptor.getDefaultValue();
if( value != null ){
return value;
}
}
Class< ? > type = descriptor.getType().getBinding();
if (Boolean.class.isAssignableFrom(type)
|| boolean.class.isAssignableFrom(type)){
return Boolean.FALSE;
}
if (String.class.isAssignableFrom(type)){
return ""; //$NON-NLS-1$
}
if (Integer.class.isAssignableFrom(type)){
return Integer.valueOf(0);
}
if (Double.class.isAssignableFrom(type)){
return Double.valueOf(0);
}
if (Float.class.isAssignableFrom(type)){
return Float.valueOf(0);
}
return null;
}
}