org.geotools.appschema.jdbc

Class NestedFilterToSQL

Object

FilterToSQL

NestedFilterToSQL

All Implemented Interfaces:

ExpressionVisitor, FilterVisitor

public class NestedFilterToSQL
extends FilterToSQL

FilterToSQL decorator capable of encoding filters on nested attributes.

Currently, the filters that can be translated to SQL are:

• BBOX
• Contains
• Touches
• Intersects
• Overlaps
• Within
• Crosses
• Disjoint
• Equals
• Beyond
• DWithin
• PropertyIsEqualTo
• PropertyIsNotEqualTo
• PropertyIsLessThan
• PropertyIsLessThanOrEqualTo
• PropertyIsGreaterThan
• PropertyIsGreaterThanOrEqualTo
• PropertyIsLike
• PropertyIsNull
• PropertyIsBetween

Note that, in order to be successfully encoded, the filter must not involve more than one nested attribute (i.e. comparing nested attributes is not supported), nor attributes that are chained via polymorphic mappings.

If the visited filter does not involve nested attributes, its encoding is delegated to the wrapped FilterToSQL instance.

Author:

Mauro Bartolomeoli, GeoSolutions, Stefano Costa, GeoSolutions

Nested Class Summary

Nested classes/interfaces inherited from class FilterToSQL

FilterToSQL.FieldEncoder

Field Summary

Fields inherited from class FilterToSQL

capabilities, currentDimension, currentGeometry, currentSRID, databaseSchema, encodingFunction, featureType, fieldEncoder, filterFactory, inEncodingEnabled, inline, IO_ERROR, LOGGER, out, primaryKey

Constructor Summary

Constructors

Constructor and Description
NestedFilterToSQL(FeatureTypeMapping rootMapping, FilterToSQL original) Constructor.

Method Summary

Modifier and Type	Method and Description
void	encode(Filter filter) Performs the encoding, sends the encoded sql to the writer passed in.
static boolean	isNestedFilter(Filter filter) A filter is considered nested if it operates on at least one nested attribute.
boolean	isReplaceOrWithUnion()
void	setReplaceOrWithUnion(boolean replaceOrWithUnion)
void	setSelectClause(String selectClause)
Object	visit(BBOX filter, Object extraData)
Object	visit(Beyond filter, Object extraData)
protected Object	visit(BinaryLogicOperator filter, Object extraData) If replaceOrWithUnion flag is enabled this method will build main OR condition in the form of UNION queries like: SELECT id, name FROM table WHERE name = "Alf" OR name = "Rick" -> SELECT id, name FROM table WHERE name = "Alf" UNION SELECT id, name FROM table WHERE name = "Rick"
Object	visit(Contains filter, Object extraData)
Object	visit(Crosses filter, Object extraData)
Object	visit(Disjoint filter, Object extraData)
Object	visit(DWithin filter, Object extraData)
Object	visit(Equals filter, Object extraData)
Object	visit(Intersects filter, Object extraData)
Object	visit(Or filter, Object extraData) Write the SQL for an Or filter
Object	visit(Overlaps filter, Object extraData)
Object	visit(PropertyIsBetween filter, Object extraData) Writes the SQL for the PropertyIsBetween Filter.
Object	visit(PropertyIsEqualTo filter, Object extraData) Write the SQL for this kind of filter
Object	visit(PropertyIsGreaterThan filter, Object extraData) Write the SQL for this kind of filter
Object	visit(PropertyIsGreaterThanOrEqualTo filter, Object extraData) Write the SQL for this kind of filter
Object	visit(PropertyIsLessThan filter, Object extraData) Write the SQL for this kind of filter
Object	visit(PropertyIsLessThanOrEqualTo filter, Object extraData) Write the SQL for this kind of filter
Object	visit(PropertyIsLike filter, Object extraData) Writes the SQL for the Like Filter.
Object	visit(PropertyIsNotEqualTo filter, Object extraData) Write the SQL for this kind of filter
Object	visit(PropertyIsNull filter, Object extraData) Writes the SQL for the Null Filter.
Object	visit(Touches filter, Object extraData)
Object	visit(Within filter, Object extraData)
protected Object	visitNestedFilter(Filter filter, Object extraData, String xpath)

Methods inherited from class FilterToSQL

cast, createFilterCapabilities, encode, encodeBinaryComparisonOperator, encodeToString, encodeToString, escapeName, evaluateLiteral, getCapabilities, getDatabaseSchema, getDistanceInMeters, getDistanceInNativeUnits, getExpressionType, getFeatureType, getFunctionName, getFunctionReturnType, getParameter, getPrimaryKey, getReferenceGeometryCentroid, isBinaryExpression, isInEncodingEnabled, setCapabilities, setDatabaseSchema, setFeatureType, setFieldEncoder, setInEncodingEnabled, setInline, setPrimaryKey, setSqlNameEscape, setWriter, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visitBinaryComparisonOperator, visitBinarySpatialOperator, visitBinarySpatialOperator, visitBinarySpatialOperator, visitBinaryTemporalOperator, visitBinaryTemporalOperator, visitBinaryTemporalOperator, visitInFunction, visitLiteralGeometry, visitLiteralTimePeriod, visitNullFilter, writeBinaryExpression, writeBinaryExpressionMember, writeLiteral

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

NestedFilterToSQL

public NestedFilterToSQL(FeatureTypeMapping rootMapping,
                         FilterToSQL original)

Constructor.

Parameters:

rootMapping - the feature type being queried

original - the wrapped filter-to-SQL encoder

Method Detail

encode

public void encode(Filter filter)
            throws FilterToSQLException

Description copied from class: FilterToSQL

Performs the encoding, sends the encoded sql to the writer passed in.

Overrides:

encode in class FilterToSQL

Parameters:

filter - the Filter to be encoded.

Throws:

FilterToSQLException - If filter type not supported, or if there were io problems.

visitNestedFilter

protected Object visitNestedFilter(Filter filter,
                                   Object extraData,
                                   String xpath)

visit

public Object visit(BBOX filter,
                    Object extraData)

Specified by:

visit in interface FilterVisitor

Overrides:

visit in class FilterToSQL

visit

public Object visit(Contains filter,
                    Object extraData)

Specified by:

visit in interface FilterVisitor

Overrides:

visit in class FilterToSQL

visit

public Object visit(Touches filter,
                    Object extraData)

Specified by:

visit in interface FilterVisitor

Overrides:

visit in class FilterToSQL

visit

public Object visit(Intersects filter,
                    Object extraData)

Specified by:

visit in interface FilterVisitor

Overrides:

visit in class FilterToSQL

visit

public Object visit(Overlaps filter,
                    Object extraData)

Specified by:

visit in interface FilterVisitor

Overrides:

visit in class FilterToSQL

visit

public Object visit(Within filter,
                    Object extraData)

Specified by:

visit in interface FilterVisitor

Overrides:

visit in class FilterToSQL

visit

public Object visit(Crosses filter,
                    Object extraData)

Specified by:

visit in interface FilterVisitor

Overrides:

visit in class FilterToSQL

visit

public Object visit(Disjoint filter,
                    Object extraData)

Specified by:

visit in interface FilterVisitor

Overrides:

visit in class FilterToSQL

visit

public Object visit(Equals filter,
                    Object extraData)

Specified by:

visit in interface FilterVisitor

Overrides:

visit in class FilterToSQL

visit

public Object visit(Beyond filter,
                    Object extraData)

Specified by:

visit in interface FilterVisitor

Overrides:

visit in class FilterToSQL

visit

public Object visit(Or filter,
                    Object extraData)

Description copied from class: FilterToSQL

Write the SQL for an Or filter

Specified by:

visit in interface FilterVisitor

Overrides:

visit in class FilterToSQL

Parameters:

filter - the filter to visit

extraData - extra data (unused by this method)

visit

protected Object visit(BinaryLogicOperator filter,
                       Object extraData)

If replaceOrWithUnion flag is enabled this method will build main OR condition in the form of UNION queries like: SELECT id, name FROM table WHERE name = "Alf" OR name = "Rick" -> SELECT id, name FROM table WHERE name = "Alf" UNION SELECT id, name FROM table WHERE name = "Rick"

Overrides:

visit in class FilterToSQL

Parameters:

filter - the logic statement to be turned into SQL.

extraData - extra filter data. Not modified directly by this method.

visit

public Object visit(DWithin filter,
                    Object extraData)

Specified by:

visit in interface FilterVisitor

Overrides:

visit in class FilterToSQL

visit

public Object visit(PropertyIsEqualTo filter,
                    Object extraData)

Description copied from class: FilterToSQL

Write the SQL for this kind of filter

Specified by:

visit in interface FilterVisitor

Overrides:

visit in class FilterToSQL

Parameters:

filter - the filter to visit

extraData - extra data (unused by this method)

visit

public Object visit(PropertyIsBetween filter,
                    Object extraData)
             throws RuntimeException

Description copied from class: FilterToSQL

Writes the SQL for the PropertyIsBetween Filter.

Specified by:

visit in interface FilterVisitor

Overrides:

visit in class FilterToSQL

Parameters:

filter - the Filter to be visited.

Throws:

RuntimeException - for io exception with writer

visit

public Object visit(PropertyIsLike filter,
                    Object extraData)

Description copied from class: FilterToSQL

Writes the SQL for the Like Filter. Assumes the current java implemented wildcards for the Like Filter: . for multi and .? for single. And replaces them with the SQL % and _, respectively.

Specified by:

visit in interface FilterVisitor

Overrides:

visit in class FilterToSQL

Parameters:

filter - the Like Filter to be visited.

visit

public Object visit(PropertyIsGreaterThanOrEqualTo filter,
                    Object extraData)

Description copied from class: FilterToSQL

Write the SQL for this kind of filter

Specified by:

visit in interface FilterVisitor

Overrides:

visit in class FilterToSQL

Parameters:

filter - the filter to visit

extraData - extra data (unused by this method)

visit

public Object visit(PropertyIsGreaterThan filter,
                    Object extraData)

Description copied from class: FilterToSQL

Write the SQL for this kind of filter

Specified by:

visit in interface FilterVisitor

Overrides:

visit in class FilterToSQL

Parameters:

filter - the filter to visit

extraData - extra data (unused by this method)

visit

public Object visit(PropertyIsLessThan filter,
                    Object extraData)

Description copied from class: FilterToSQL

Write the SQL for this kind of filter

Specified by:

visit in interface FilterVisitor

Overrides:

visit in class FilterToSQL

Parameters:

filter - the filter to visit

extraData - extra data (unused by this method)

visit

public Object visit(PropertyIsLessThanOrEqualTo filter,
                    Object extraData)

Description copied from class: FilterToSQL

Write the SQL for this kind of filter

Specified by:

visit in interface FilterVisitor

Overrides:

visit in class FilterToSQL

Parameters:

filter - the filter to visit

extraData - extra data (unused by this method)

visit

public Object visit(PropertyIsNotEqualTo filter,
                    Object extraData)

Description copied from class: FilterToSQL

Write the SQL for this kind of filter

Specified by:

visit in interface FilterVisitor

Overrides:

visit in class FilterToSQL

Parameters:

filter - the filter to visit

extraData - extra data (unused by this method)

visit

public Object visit(PropertyIsNull filter,
                    Object extraData)
             throws RuntimeException

Description copied from class: FilterToSQL

Writes the SQL for the Null Filter.

Specified by:

visit in interface FilterVisitor

Overrides:

visit in class FilterToSQL

Parameters:

filter - the null filter to be written to SQL.

Throws:

RuntimeException - for io exception with writer

isNestedFilter

public static boolean isNestedFilter(Filter filter)

A filter is considered nested if it operates on at least one nested attribute.

Technically, this means that at least one of the expressions in it is an instance of NestedAttributeExpression.

Parameters:

filter - the filter to test

Returns:

true if the filter involves at least one nested attribute, false otherwise

setSelectClause

public void setSelectClause(String selectClause)

isReplaceOrWithUnion

public boolean isReplaceOrWithUnion()

setReplaceOrWithUnion

public void setReplaceOrWithUnion(boolean replaceOrWithUnion)