/*
* 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.visitor;
import org.opengis.filter.And;
import org.opengis.filter.ExcludeFilter;
import org.opengis.filter.FilterVisitor;
import org.opengis.filter.Id;
import org.opengis.filter.IncludeFilter;
import org.opengis.filter.Not;
import org.opengis.filter.Or;
import org.opengis.filter.PropertyIsBetween;
import org.opengis.filter.PropertyIsEqualTo;
import org.opengis.filter.PropertyIsGreaterThan;
import org.opengis.filter.PropertyIsGreaterThanOrEqualTo;
import org.opengis.filter.PropertyIsLessThan;
import org.opengis.filter.PropertyIsLessThanOrEqualTo;
import org.opengis.filter.PropertyIsLike;
import org.opengis.filter.PropertyIsNil;
import org.opengis.filter.PropertyIsNotEqualTo;
import org.opengis.filter.PropertyIsNull;
import org.opengis.filter.capability.ArithmeticOperators;
import org.opengis.filter.capability.ComparisonOperators;
import org.opengis.filter.capability.FilterCapabilities;
import org.opengis.filter.capability.FunctionName;
import org.opengis.filter.capability.Functions;
import org.opengis.filter.capability.ScalarCapabilities;
import org.opengis.filter.capability.SpatialCapabilities;
import org.opengis.filter.capability.SpatialOperators;
import org.opengis.filter.capability.TemporalCapabilities;
import org.opengis.filter.capability.TemporalOperator;
import org.opengis.filter.capability.TemporalOperators;
import org.opengis.filter.expression.Add;
import org.opengis.filter.expression.Divide;
import org.opengis.filter.expression.ExpressionVisitor;
import org.opengis.filter.expression.Function;
import org.opengis.filter.expression.Literal;
import org.opengis.filter.expression.Multiply;
import org.opengis.filter.expression.NilExpression;
import org.opengis.filter.expression.PropertyName;
import org.opengis.filter.expression.Subtract;
import org.opengis.filter.spatial.BBOX;
import org.opengis.filter.spatial.Beyond;
import org.opengis.filter.spatial.Contains;
import org.opengis.filter.spatial.Crosses;
import org.opengis.filter.spatial.DWithin;
import org.opengis.filter.spatial.Disjoint;
import org.opengis.filter.spatial.Equals;
import org.opengis.filter.spatial.Intersects;
import org.opengis.filter.spatial.Overlaps;
import org.opengis.filter.spatial.Touches;
import org.opengis.filter.spatial.Within;
import org.opengis.filter.temporal.After;
import org.opengis.filter.temporal.AnyInteracts;
import org.opengis.filter.temporal.Before;
import org.opengis.filter.temporal.Begins;
import org.opengis.filter.temporal.BegunBy;
import org.opengis.filter.temporal.BinaryTemporalOperator;
import org.opengis.filter.temporal.During;
import org.opengis.filter.temporal.EndedBy;
import org.opengis.filter.temporal.Ends;
import org.opengis.filter.temporal.Meets;
import org.opengis.filter.temporal.MetBy;
import org.opengis.filter.temporal.OverlappedBy;
import org.opengis.filter.temporal.TContains;
import org.opengis.filter.temporal.TEquals;
import org.opengis.filter.temporal.TOverlaps;
/**
* This visitor will return Boolean.TRUE if the provided filter
* is supported by the the FilterCapabilities.
* <p>
* This method will look up the right information in the provided
* FilterCapabilities instance for you depending on the type of filter
* provided.
* <p>
* Example:<pre><code>
* boolean yes = filter.accepts( IsSupportedFilterVisitor( capabilities ), null );
* </code></pre>
*
* Please consider IsSupportedFilterVisitor if you need to be sure of the
* entire Filter.
*
* @author Jody Garnett (Refractions Research)
*
*
*
* @source $URL$
*/
public class IsSupportedFilterVisitor implements FilterVisitor, ExpressionVisitor {
private FilterCapabilities capabilities;
public IsSupportedFilterVisitor( FilterCapabilities capabilities ){
this.capabilities = capabilities;
}
/** INCLUDE and EXCLUDE are never supported */
public Object visit( ExcludeFilter filter, Object extraData ) {
return false;
}
/** INCLUDE and EXCLUDE are never supported */
public Object visit( IncludeFilter filter, Object extraData ) {
return false;
}
public Object visit( And filter, Object extraData ) {
return capabilities.getScalarCapabilities() != null &&
capabilities.getScalarCapabilities().hasLogicalOperators();
}
public Object visit( Id filter, Object extraData ) {
return capabilities.getIdCapabilities() != null &&
( capabilities.getIdCapabilities().hasFID() ||
capabilities.getIdCapabilities().hasEID() );
}
public Object visit( Not filter, Object extraData ) {
return capabilities.getScalarCapabilities() != null &&
capabilities.getScalarCapabilities().hasLogicalOperators();
}
public Object visit( Or filter, Object extraData ) {
return capabilities.getScalarCapabilities() != null &&
capabilities.getScalarCapabilities().hasLogicalOperators();
}
public Object visit( PropertyIsBetween filter, Object extraData ) {
ScalarCapabilities scalar = capabilities.getScalarCapabilities();
if( scalar == null ) return false;
ComparisonOperators operators = scalar.getComparisonOperators();
if( operators == null ) return false;
return operators.getOperator( PropertyIsBetween.NAME ) != null;
}
public Object visit( PropertyIsEqualTo filter, Object extraData ) {
ScalarCapabilities scalar = capabilities.getScalarCapabilities();
if( scalar == null ) return false;
ComparisonOperators operators = scalar.getComparisonOperators();
if( operators == null ) return false;
return operators.getOperator( PropertyIsEqualTo.NAME ) != null;
}
public Object visit( PropertyIsNotEqualTo filter, Object extraData ) {
ScalarCapabilities scalar = capabilities.getScalarCapabilities();
if( scalar == null ) return false;
ComparisonOperators operators = scalar.getComparisonOperators();
if( operators == null ) return false;
return operators.getOperator( PropertyIsNotEqualTo.NAME ) != null;
}
public Object visit( PropertyIsGreaterThan filter, Object extraData ) {
ScalarCapabilities scalar = capabilities.getScalarCapabilities();
if( scalar == null ) return false;
ComparisonOperators operators = scalar.getComparisonOperators();
if( operators == null ) return false;
return operators.getOperator( PropertyIsGreaterThan.NAME ) != null;
}
public Object visit( PropertyIsGreaterThanOrEqualTo filter, Object extraData ) {
ScalarCapabilities scalar = capabilities.getScalarCapabilities();
if( scalar == null ) return false;
ComparisonOperators operators = scalar.getComparisonOperators();
if( operators == null ) return false;
return operators.getOperator( PropertyIsGreaterThanOrEqualTo.NAME ) != null;
}
public Object visit( PropertyIsLessThan filter, Object extraData ) {
ScalarCapabilities scalar = capabilities.getScalarCapabilities();
if( scalar == null ) return false;
ComparisonOperators operators = scalar.getComparisonOperators();
if( operators == null ) return false;
return operators.getOperator( PropertyIsLessThan.NAME ) != null;
}
public Object visit( PropertyIsLessThanOrEqualTo filter, Object extraData ) {
ScalarCapabilities scalar = capabilities.getScalarCapabilities();
if( scalar == null ) return false;
ComparisonOperators operators = scalar.getComparisonOperators();
if( operators == null ) return false;
return operators.getOperator( PropertyIsLessThanOrEqualTo.NAME ) != null;
}
public Object visit( PropertyIsLike filter, Object extraData ) {
ScalarCapabilities scalar = capabilities.getScalarCapabilities();
if( scalar == null ) return false;
ComparisonOperators operators = scalar.getComparisonOperators();
if( operators == null ) return false;
return operators.getOperator( PropertyIsLike.NAME ) != null;
}
public Object visit( PropertyIsNull filter, Object extraData ) {
ScalarCapabilities scalar = capabilities.getScalarCapabilities();
if( scalar == null ) return false;
ComparisonOperators operators = scalar.getComparisonOperators();
if( operators == null ) return false;
return operators.getOperator( PropertyIsNull.NAME ) != null;
}
public Object visit( PropertyIsNil filter, Object extraData ) {
ScalarCapabilities scalar = capabilities.getScalarCapabilities();
if( scalar == null ) return false;
ComparisonOperators operators = scalar.getComparisonOperators();
if( operators == null ) return false;
return operators.getOperator( PropertyIsNil.NAME ) != null;
}
public Object visit( BBOX filter, Object extraData ) {
SpatialCapabilities spatial = capabilities.getSpatialCapabilities();
if( spatial == null ) return false;
SpatialOperators operators = spatial.getSpatialOperators();
if( operators == null ) return false;
return operators.getOperator( BBOX.NAME ) != null;
}
public Object visit( Beyond filter, Object extraData ) {
SpatialCapabilities spatial = capabilities.getSpatialCapabilities();
if( spatial == null ) return false;
SpatialOperators operators = spatial.getSpatialOperators();
if( operators == null ) return false;
return operators.getOperator( Beyond.NAME ) != null;
}
public Object visit( Contains filter, Object extraData ) {
SpatialCapabilities spatial = capabilities.getSpatialCapabilities();
if( spatial == null ) return false;
SpatialOperators operators = spatial.getSpatialOperators();
if( operators == null ) return false;
return operators.getOperator( Contains.NAME ) != null;
}
public Object visit( Crosses filter, Object extraData ) {
SpatialCapabilities spatial = capabilities.getSpatialCapabilities();
if( spatial == null ) return false;
SpatialOperators operators = spatial.getSpatialOperators();
if( operators == null ) return false;
return operators.getOperator( Crosses.NAME ) != null;
}
public Object visit( Disjoint filter, Object extraData ) {
SpatialCapabilities spatial = capabilities.getSpatialCapabilities();
if( spatial == null ) return false;
SpatialOperators operators = spatial.getSpatialOperators();
if( operators == null ) return false;
return operators.getOperator( Disjoint.NAME ) != null;
}
public Object visit( DWithin filter, Object extraData ) {
SpatialCapabilities spatial = capabilities.getSpatialCapabilities();
if( spatial == null ) return false;
SpatialOperators operators = spatial.getSpatialOperators();
if( operators == null ) return false;
return operators.getOperator( DWithin.NAME ) != null;
}
public Object visit( Equals filter, Object extraData ) {
SpatialCapabilities spatial = capabilities.getSpatialCapabilities();
if( spatial == null ) return false;
SpatialOperators operators = spatial.getSpatialOperators();
if( operators == null ) return false;
return operators.getOperator( Equals.NAME ) != null;
}
public Object visit( Intersects filter, Object extraData ) {
SpatialCapabilities spatial = capabilities.getSpatialCapabilities();
if( spatial == null ) return false;
SpatialOperators operators = spatial.getSpatialOperators();
if( operators == null ) return false;
return operators.getOperator( Intersects.NAME ) != null;
}
public Object visit( Overlaps filter, Object extraData ) {
SpatialCapabilities spatial = capabilities.getSpatialCapabilities();
if( spatial == null ) return false;
SpatialOperators operators = spatial.getSpatialOperators();
if( operators == null ) return false;
return operators.getOperator( Overlaps.NAME ) != null;
}
public Object visit( Touches filter, Object extraData ) {
SpatialCapabilities spatial = capabilities.getSpatialCapabilities();
if( spatial == null ) return false;
SpatialOperators operators = spatial.getSpatialOperators();
if( operators == null ) return false;
return operators.getOperator( Touches.NAME ) != null;
}
public Object visit( Within filter, Object extraData ) {
SpatialCapabilities spatial = capabilities.getSpatialCapabilities();
if( spatial == null ) return false;
SpatialOperators operators = spatial.getSpatialOperators();
if( operators == null ) return false;
return operators.getOperator( Within.NAME ) != null;
}
public Object visitNullFilter( Object extraData ) {
return false;
}
//
// Expressions
//
/** NilExpression is a placeholder and is never supported */
public Object visit( NilExpression expression, Object extraData ) {
return false;
}
public Object visit( Add expression, Object extraData ) {
ScalarCapabilities scalar = capabilities.getScalarCapabilities();
if( scalar == null ) return false;
ArithmeticOperators operators = scalar.getArithmeticOperators();
if( operators == null ) return false;
return operators.hasSimpleArithmetic();
}
public Object visit( Divide expression, Object extraData ) {
ScalarCapabilities scalar = capabilities.getScalarCapabilities();
if( scalar == null ) return false;
ArithmeticOperators operators = scalar.getArithmeticOperators();
if( operators == null ) return false;
return operators.hasSimpleArithmetic();
}
public Object visit( Function function, Object extraData ) {
ScalarCapabilities scalar = capabilities.getScalarCapabilities();
if( scalar == null ) return false;
ArithmeticOperators operators = scalar.getArithmeticOperators();
if( operators == null ) return false;
Functions functions = operators.getFunctions();
if( functions == null ) return false;
// Note that only function name is checked here
FunctionName found = functions.getFunctionName( function.getName() );
// And that's enough to assess if the function is supported
return found != null;
}
public Object visit( Literal expression, Object extraData ) {
return true;
}
public Object visit( Multiply expression, Object extraData ) {
ScalarCapabilities scalar = capabilities.getScalarCapabilities();
if( scalar == null ) return false;
ArithmeticOperators operators = scalar.getArithmeticOperators();
if( operators == null ) return false;
return operators.hasSimpleArithmetic();
}
/**
* You can override this to perform a sanity check against a provided
* FeatureType.
*/
public Object visit( PropertyName expression, Object extraData ) {
return true;
}
public Object visit( Subtract expression, Object extraData ) {
ScalarCapabilities scalar = capabilities.getScalarCapabilities();
if( scalar == null ) return false;
ArithmeticOperators operators = scalar.getArithmeticOperators();
if( operators == null ) return false;
return operators.hasSimpleArithmetic();
}
public Object visit(After after, Object extraData) {
return visit((BinaryTemporalOperator)after, After.NAME);
}
public Object visit(AnyInteracts anyInteracts, Object extraData) {
return visit((BinaryTemporalOperator)anyInteracts, AnyInteracts.NAME);
}
public Object visit(Before before, Object extraData) {
return visit((BinaryTemporalOperator)before, Before.NAME);
}
public Object visit(Begins begins, Object extraData) {
return visit((BinaryTemporalOperator)begins, Begins.NAME);
}
public Object visit(BegunBy begunBy, Object extraData) {
return visit((BinaryTemporalOperator)begunBy, extraData);
}
public Object visit(During during, Object extraData) {
return visit((BinaryTemporalOperator)during, During.NAME);
}
public Object visit(EndedBy endedBy, Object extraData) {
return visit((BinaryTemporalOperator)endedBy, EndedBy.NAME);
}
public Object visit(Ends ends, Object extraData) {
return visit((BinaryTemporalOperator)ends, Ends.NAME);
}
public Object visit(Meets meets, Object extraData) {
return visit((BinaryTemporalOperator)meets, Meets.NAME);
}
public Object visit(MetBy metBy, Object extraData) {
return visit((BinaryTemporalOperator)metBy, MetBy.NAME);
}
public Object visit(OverlappedBy overlappedBy, Object extraData) {
return visit((BinaryTemporalOperator)overlappedBy, OverlappedBy.NAME);
}
public Object visit(TContains contains, Object extraData) {
return visit((BinaryTemporalOperator)contains, TContains.NAME);
}
public Object visit(TEquals equals, Object extraData) {
return visit((BinaryTemporalOperator)equals, TEquals.NAME);
}
public Object visit(TOverlaps contains, Object extraData) {
return visit((BinaryTemporalOperator)contains, TOverlaps.NAME);
}
protected Object visit(BinaryTemporalOperator filter, Object data) {
TemporalCapabilities temporal = capabilities.getTemporalCapabilities();
if( temporal == null ) return false;
TemporalOperators operators = temporal.getTemporalOperators();
if( operators == null ) return false;
return operators.getOperator((String)data) != null;
}
}