/*
* 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.filter.expression;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import junit.framework.TestCase;
import org.geotools.factory.Hints;
import org.geotools.feature.AttributeImpl;
import org.geotools.feature.ComplexAttributeImpl;
import org.geotools.feature.FeatureImpl;
import org.geotools.feature.NameImpl;
import org.geotools.feature.type.AttributeDescriptorImpl;
import org.geotools.feature.type.AttributeTypeImpl;
import org.geotools.feature.type.ComplexTypeImpl;
import org.geotools.feature.type.UniqueNameFeatureTypeFactoryImpl;
import org.geotools.filter.AttributeExpressionImpl;
import org.geotools.filter.identity.FeatureIdImpl;
import org.opengis.feature.Feature;
import org.opengis.feature.Property;
import org.opengis.feature.type.AttributeDescriptor;
import org.opengis.feature.type.AttributeType;
import org.opengis.feature.type.ComplexType;
import org.opengis.feature.type.FeatureType;
import org.opengis.feature.type.FeatureTypeFactory;
import org.opengis.feature.type.Name;
import org.opengis.feature.type.PropertyDescriptor;
import org.xml.sax.helpers.NamespaceSupport;
/**
* This is to demonstrate evaluating XPaths as attribute expressions when complex
* attributes/features are passed in, instead of simple features. This is necessary since complex
* features could contain nested properties, and we should be able to get properties of any level
* from the features.
*
* @author Rini Angreani, Curtin University of Technology
*
*
* @source $URL$
*/
public class FeaturePropertyAccessorTest extends TestCase {
/**
* Mock name space prefix
*/
static final String EG = "urn:cgi:xmlns:Example:1.0";
static final Name SIMPLE_ATTRIBUTE = new NameImpl(EG, "simpleAttribute");
static final Name COMPLEX_ATTRIBUTE = new NameImpl(EG, "complexAttribute");
static final Name ROOT_ATTRIBUTE = new NameImpl(EG, "rootAttribute");
static final Name SINGLE_LEAF_ATTRIBUTE = new NameImpl(EG, "singleLeafAttribute");
static final Name MULTI_LEAF_ATTRIBUTE = new NameImpl(EG, "multiLeafAttribute");
/**
* Mock name space
*/
static final NamespaceSupport NAMESPACES = new NamespaceSupport() {
{
declarePrefix("eg", EG);
}
};
public void testComplexFeature() {
FeatureType fType = createFeatureType();
ComplexType complexAttType = (ComplexType) fType.getDescriptor(COMPLEX_ATTRIBUTE).getType();
ComplexType rootAttType = (ComplexType) complexAttType.getDescriptor(ROOT_ATTRIBUTE)
.getType();
// feature properties
Collection<Property> properties = new ArrayList<Property>(fType.getDescriptors().size());
/**
* Build the feature properties
*/
// eg:simpleAttribute
AttributeDescriptor attDesc = (AttributeDescriptor) fType.getDescriptor(SIMPLE_ATTRIBUTE);
AttributeImpl simpleAttribute = new AttributeImpl("simple value", attDesc, null);
properties.add(simpleAttribute);
// eg:complexAttribute/eg:rootAttribute[1]
Collection<Property> rootPropertiesOne = new ArrayList<Property>();
attDesc = (AttributeDescriptor) rootAttType.getDescriptor(MULTI_LEAF_ATTRIBUTE);
// eg:complexAttribute/eg:rootAttribute[1]/eg:multiLeafAttribute[1]
AttributeImpl leafOne = new AttributeImpl("multi leaf value 1", attDesc, null);
rootPropertiesOne.add(leafOne);
// eg:complexAttribute/eg:rootAttribute[1]/eg:multiLeafAttribute[2]
AttributeImpl leafTwo = new AttributeImpl("multi leaf value 2", attDesc, null);
rootPropertiesOne.add(leafTwo);
// eg:complexAttribute/eg:rootAttribute[1]/eg:singleLeafAttribute
attDesc = (AttributeDescriptor) rootAttType.getDescriptor(SINGLE_LEAF_ATTRIBUTE);
AttributeImpl singleLeaf = new AttributeImpl("single leaf value", attDesc, null);
rootPropertiesOne.add(singleLeaf);
AttributeDescriptor rootDesc = (AttributeDescriptor) complexAttType
.getDescriptor(ROOT_ATTRIBUTE);
AttributeImpl rootOne = new ComplexAttributeImpl(rootPropertiesOne, rootDesc, null);
// eg:complexAttribute/eg:rootAttribute[2]
Collection<Property> rootPropertiesTwo = new ArrayList<Property>();
// eg:complexAttribute/eg:rootAttribute[2]/eg:multiLeafAttribute[1]
rootPropertiesTwo.add(leafOne);
AttributeImpl rootTwo = new ComplexAttributeImpl(rootPropertiesTwo, rootDesc, null);
// eg:complexAttribute/eg:rootAttribute[3]
Collection<Property> rootPropertiesThree = new ArrayList<Property>();
// eg:complexAttribute/eg:rootAttribute[3]/eg:singleLeafAttribute
rootPropertiesThree.add(singleLeaf);
AttributeImpl rootThree = new ComplexAttributeImpl(rootPropertiesThree, rootDesc, null);
Collection<Property> complexProperties = new ArrayList<Property>(2);
complexProperties.add(rootOne);
complexProperties.add(rootTwo);
complexProperties.add(rootThree);
AttributeImpl complexAttribute = new ComplexAttributeImpl(complexProperties,
complexAttType, null);
properties.add(complexAttribute);
Feature feature = new FeatureImpl(properties, fType, new FeatureIdImpl("test1"));
/**
* Test evaluating complex feature
*/
// test evaluating simple property
AttributeExpressionImpl ex = new AttributeExpressionImpl("eg:simpleAttribute", new Hints(
FeaturePropertyAccessorFactory.NAMESPACE_CONTEXT, NAMESPACES));
assertEquals(simpleAttribute, ex.evaluate(feature));
// test evaluating complex property
ex = new AttributeExpressionImpl("eg:complexAttribute", new Hints(
FeaturePropertyAccessorFactory.NAMESPACE_CONTEXT, NAMESPACES));
assertEquals(complexAttribute, ex.evaluate(feature));
// test multi-valued nested properties
ex = new AttributeExpressionImpl("eg:complexAttribute/eg:rootAttribute", new Hints(
FeaturePropertyAccessorFactory.NAMESPACE_CONTEXT, NAMESPACES));
// no index would return the first one
assertEquals(rootOne, ex.evaluate(feature));
// index specified
ex = new AttributeExpressionImpl("eg:complexAttribute/eg:rootAttribute[2]", new Hints(
FeaturePropertyAccessorFactory.NAMESPACE_CONTEXT, NAMESPACES));
assertEquals(rootTwo, ex.evaluate(feature));
// single valued nested property
ex = new AttributeExpressionImpl(
"eg:complexAttribute/eg:rootAttribute[3]/eg:singleLeafAttribute", new Hints(
FeaturePropertyAccessorFactory.NAMESPACE_CONTEXT, NAMESPACES));
assertEquals(singleLeaf, ex.evaluate(feature));
// null values
ex = new AttributeExpressionImpl(
"eg:complexAttribute/eg:rootAttribute[3]/eg:multiLeafAttribute", new Hints(
FeaturePropertyAccessorFactory.NAMESPACE_CONTEXT, NAMESPACES));
assertEquals(null, ex.evaluate(feature));
// deeper nesting
ex = new AttributeExpressionImpl(
"eg:complexAttribute/eg:rootAttribute[2]/eg:multiLeafAttribute", new Hints(
FeaturePropertyAccessorFactory.NAMESPACE_CONTEXT, NAMESPACES));
assertEquals(leafOne, ex.evaluate(feature));
// property index doesn't exist
ex = new AttributeExpressionImpl(
"eg:complexAttribute/eg:rootAttribute[2]/eg:multiLeafAttribute[2]", new Hints(
FeaturePropertyAccessorFactory.NAMESPACE_CONTEXT, NAMESPACES));
assertEquals(null, ex.evaluate(feature));
// expect an exception when object supplied is not a complex attribute
boolean exceptionThrown = false;
try {
ex.setLenient(false); //NC -added, only exception if lenient off
assertEquals(null, ex.evaluate(singleLeaf));
} catch (Exception e) {
exceptionThrown = true;
}
if (!exceptionThrown) {
fail("Expecting Exception since object passed in is not a complex attribute.");
}
// invalid property
ex = new AttributeExpressionImpl("randomAttribute", new Hints(
FeaturePropertyAccessorFactory.NAMESPACE_CONTEXT, NAMESPACES));
assertEquals(null, ex.evaluate(feature));
}
public static FeatureType createFeatureType() {
FeatureTypeFactory tfac = new UniqueNameFeatureTypeFactoryImpl();
Name fName = new NameImpl(EG, "complexFeatureType");
Collection<PropertyDescriptor> schema = new ArrayList<PropertyDescriptor>();
// add simple attribute
AttributeType attType = new AttributeTypeImpl(SIMPLE_ATTRIBUTE, String.class, false, false,
Collections.EMPTY_LIST, null, null);
AttributeDescriptor attDesc = new AttributeDescriptorImpl(attType, SIMPLE_ATTRIBUTE, 0, 1,
true, null);
schema.add(attDesc);
// build nested attributes
Collection<PropertyDescriptor> rootProperties = new ArrayList<PropertyDescriptor>();
attType = new AttributeTypeImpl(SINGLE_LEAF_ATTRIBUTE, String.class, false, false,
Collections.EMPTY_LIST, null, null);
attDesc = new AttributeDescriptorImpl(attType, SINGLE_LEAF_ATTRIBUTE, 0, 1, true, null);
rootProperties.add(attDesc);
attType = new AttributeTypeImpl(MULTI_LEAF_ATTRIBUTE, String.class, false, false,
Collections.EMPTY_LIST, null, null);
attDesc = new AttributeDescriptorImpl(attType, MULTI_LEAF_ATTRIBUTE, 0, -1, true, null);
rootProperties.add(attDesc);
attType = new ComplexTypeImpl(ROOT_ATTRIBUTE, rootProperties, false, false,
Collections.EMPTY_LIST, null, null);
attDesc = new AttributeDescriptorImpl(attType, ROOT_ATTRIBUTE, 0, -1, true, null);
Collection<PropertyDescriptor> nestedProperties = new ArrayList<PropertyDescriptor>(1);
nestedProperties.add(attDesc);
// add nested properties to complex attribute
attType = new ComplexTypeImpl(COMPLEX_ATTRIBUTE, nestedProperties, false, false,
Collections.EMPTY_LIST, null, null);
attDesc = new AttributeDescriptorImpl(attType, COMPLEX_ATTRIBUTE, 0, -1, true, null);
// add to feature schema
schema.add(attDesc);
return tfac.createFeatureType(fName, schema, null, false, Collections.EMPTY_LIST, null,
null);
}
}