Application: gvSIG desktop

package org.gvsig.expressionevaluator.impl;

import java.text.MessageFormat;

import java.util.ArrayList;

import java.util.Collection;

import java.util.Collections;

import java.util.HashMap;

import java.util.HashSet;

import java.util.List;

import java.util.Map;

import java.util.Objects;

import java.util.Set;

import org.apache.commons.lang3.ObjectUtils;

import org.apache.commons.lang3.StringUtils;

import org.cresques.cts.IProjection;

import org.gvsig.fmap.geom.Geometry;

import org.gvsig.fmap.geom.primitive.Envelope;

import org.gvsig.expressionevaluator.ExpressionBuilder;

import org.gvsig.fmap.geom.DataTypes;

@SuppressWarnings({"UseSpecificCatch","OverridableMethodCallInConstructor"})

public class DefaultExpressionBuilder implements ExpressionBuilder {

    public class ConfigBase implements Config {

        protected Map<String, Object> values;

        public ConfigBase() {

            this.values = new HashMap<>();

            this.set(Config.has_spatial_functions, true);

            this.set(Config.support_schemas, true);

            this.set(Config.constant_true, "(1=1)");

            this.set(Config.constant_false, "(1=2)");

            this.set(Config.quote_for_identifiers, "\"");

            this.set(Config.quote_for_strings, "'");

            this.set(Config.geometry_type_support, GeometrySupportType.WKB);

            this.set(Config.group, "( {0} )");

            this.set(Config.ST_SRID, "ST_SRID({0})");

            this.set(Config.ST_AsText, "ST_AsText({0})");

            this.set(Config.ST_AsBinary, "ST_AsBinary({0})");

            this.set(Config.ST_AsEWKB, "ST_AsEWKB({0})");

            this.set(Config.ST_Contains, "ST_Contains(({0}), ({1}))");

            this.set(Config.ST_Crosses, "ST_Crosses(({0}), ({1}))");

            this.set(Config.ST_Disjoint, "ST_Disjoint(({0}), ({1}))");

            this.set(Config.ST_Equals, "ST_Equals(({0}), ({1}))");

            this.set(Config.ST_IsClosed, "ST_IsClosed({0})");

            this.set(Config.ST_Overlaps, "ST_Overlaps(({0}), ({1}))");

            this.set(Config.ST_Touches, "ST_Touches(({0}), ({1}))");

            this.set(Config.ST_Within, "ST_Within(({0}), ({1}))");

            this.set(Config.ST_Envelope, "ST_Envelope({0})");

            this.set(Config.ST_Intersects, "ST_Intersects(({0}), ({1}))");

            this.set(Config.ST_GeomFromText, "ST_GeomFromText({0}, ({1}))");

            this.set(Config.ST_GeomFromWKB, "ST_GeomFromWKB(({0}), ({1}))");

            this.set(Config.ST_GeomFromEWKB, "ST_GeomFromEWKB(({0}), ({1}))");

            // Por defecto no esta disponible la funcion ST_Simplify

            // this.set(Config.ST_Simplify, "ST_Simplify(({0}), ({1}))");

            this.remove_functionality(Config.ST_Simplify);

            this.set(Config.lcase, "LCASE({0})");

            this.set(Config.ucase, "UCASE({0})");

            this.set(Config.isNull, "( ({0}) IS NULL )");

            this.set(Config.notIsNull, "( ({0}) NOT IS NULL )");

            this.set(Config.operator_not, "( NOT ({0}) )");

            this.set(Config.operator_AND, "{0} AND {1}");

            this.set(Config.operator_OR, "{0} OR {1}");

            this.set(Config.operator_EQ, "( ({0}) = ({1}) )");

            this.set(Config.operator_NE, "( ({0}) <> ({1}) )");

            this.set(Config.operator_GT, "( ({0}) > ({1}) )");

            this.set(Config.operator_GE, "( ({0}) >= ({1}) )");

            this.set(Config.operator_LT, "( ({0}) < ({1}) )");

            this.set(Config.operator_LE, "( ({0}) <= ({1}) )");

            this.set(Config.operator_LIKE, "( ({0}) LIKE ({1}) )");

            this.set(Config.operator_ILIKE, "( ({0}) ILIKE ({1}) )");

            this.set(Config.operator_add, "{0} + {1}");

            this.set(Config.operator_subst, "{0} - {1}");

            this.set(Config.operator_mult, "{0} * {1}");

            this.set(Config.operator_div, "{0} / {1}");

            this.set(Config.operator_concat, "{0} || {1}");

        }

        @Override

        public boolean has_functionality(String functionality) {

            Object x = this.values.get(functionality);

            if (x == null) {

                return false;

            }

            if (x instanceof CharSequence && StringUtils.isEmpty((CharSequence) x)) {

                return false;

            }

            return true;

        }

        @Override

        public void remove_functionality(String functionality) {

            this.values.remove(functionality);

        }

        @Override

        public boolean has_spatial_functions() {

            return this.getBoolean(has_spatial_functions);

        }

        @Override

        public GeometrySupportType getGeometryTypeSupport() {

            return (GeometrySupportType) this.get(geometry_type_support);

        }

        @Override

        public boolean getBoolean(String name) {

            return (boolean) this.values.get(name);

        }

        @Override

        public String getString(String name) {

            return (String) this.values.get(name);

        }

        @Override

        public Object get(String name) {

            return this.values.get(name);

        }

        @Override

        public void set(String name, Object value) {

            this.values.put(name, value);

        }

    }

    public abstract class AbstractValue implements Value {

        @Override

        public void accept(Visitor visitor, VisitorFilter filter) {

            if (filter == null || filter.accept(this)) {

                visitor.visit(this);

            }

        }

    }

    public class ClassVisitorFilter implements VisitorFilter {

        private final Class classFilter;

        public ClassVisitorFilter(Class classFilter) {

            this.classFilter = classFilter;

        }

        @Override

        public boolean accept(Visitable visitable) {

            return classFilter.isInstance(visitable);

        }

    }

    public class GroupBase extends AbstractValue implements Group {

        protected Value value;

        public GroupBase(Value value) {

            this.value = value;

        }

        @Override

        public Value getValue() {

            return value;

        }

        @Override

        public void accept(Visitor visitor, VisitorFilter filter) {

            super.accept(visitor, filter);

            this.value.accept(visitor, filter);

        }

        @Override

        public String toString() {

            return MessageFormat.format(config.getString(Config.group), this.value.toString());

        }

    }

    protected class ColumnDescriptorBase implements ColumnDescriptor {

        private String name;

        private int type;

        private int type_p;

        private int type_s;

        private boolean isPk;

        private boolean _allowNulls;

        private boolean _isAutomatic;

        private Object defaultValue;

        private int geom_type;

        private int geom_subtype;

        private Object geom_srsdbcode;

        private boolean _isIndexed;

        public ColumnDescriptorBase(String name, int type, Object defaultValue) {

            this.name = name;

            this.type = type;

            this.type_p = -1;

            this.type_s = -1;

            this.isPk = false;

            this._allowNulls = true;

            this._isAutomatic = false;

            this.defaultValue = defaultValue;

            this.geom_type = Geometry.TYPES.GEOMETRY;

            this.geom_subtype = Geometry.SUBTYPES.GEOM2D;

            this.geom_srsdbcode = null;

            this._isIndexed = false;

        }

        public ColumnDescriptorBase(String name, int type, int type_p, int type_s, boolean isPk, boolean isIndexed, boolean allowNulls, boolean isAutomatic, Object defaultValue) {

            this.name = name;

            this.type = type;

            this.type_p = type_p;

            this.type_s = type_s;

            this.isPk = isPk;

            this._allowNulls = allowNulls;

            this._isAutomatic = isAutomatic;

            this.defaultValue = defaultValue;

            this.geom_type = Geometry.TYPES.GEOMETRY;

            this.geom_subtype = Geometry.SUBTYPES.GEOM2D;

            this.geom_srsdbcode = null;

            this._isIndexed = isIndexed;

        }

        public ColumnDescriptorBase(String name, int geom_type, int geom_subtype, IProjection proj, boolean isIndexed, boolean allowNulls) {

            this.name = name;

            this.type = DataTypes.GEOMETRY;

            this.type_p = 0;

            this.type_s = 0;

            this.isPk = false;

            this._allowNulls = allowNulls;

            this._isAutomatic = false;

            this.defaultValue = null;

            this.geom_type = geom_type;

            this.geom_subtype = geom_subtype;

            this.geom_srsdbcode = getSRSId(proj);

            this._isIndexed = isIndexed;

        }

        public ColumnDescriptorBase(String name, int geom_type, int geom_subtype, Object srsdbcode, boolean isIndexed, boolean allowNulls) {

            this.name = name;

            this.type = DataTypes.GEOMETRY;

            this.type_p = 0;

            this.type_s = 0;

            this.isPk = false;

            this._allowNulls = allowNulls;

            this._isAutomatic = false;

            this.defaultValue = null;

            this.geom_type = geom_type;

            this.geom_subtype = geom_subtype;

            this.geom_srsdbcode = srsdbcode;

            this._isIndexed = isIndexed;

        }

        @Override

        public String getName() {

            return this.name;

        }

        @Override

        public void setName(String name) {

            this.name = name;

        }

        @Override

        public int getType() {

            return this.type;

        }

        @Override

        public void setType(int type) {

            this.type = type;

        }

        @Override

        public int getPrecision() {

            return type_p;

        }

        @Override

        public void setPrecision(int precision) {

            this.type_p = precision;

        }

        @Override

        public int getSize() {

            return type_s;

        }

        @Override

        public void setSize(int size) {

            this.type_s = size;

        }

        @Override

        public boolean isPrimaryKey() {

            return isPk;

        }

        @Override

        public void setIsPrimaryKey(boolean isPk) {

            this.isPk = isPk;

        }

        @Override

        public boolean allowNulls() {

            return _allowNulls;

        }

        @Override

        public void setAllowNulls(boolean allowNulls) {

            this._allowNulls = allowNulls;

        }

        @Override

        public boolean isAutomatic() {

            return _isAutomatic;

        }

        @Override

        public boolean isIndexed() {

            return _isIndexed;

        }

        @Override

        public void setIsAutomatic(boolean isAutomatic) {

            this._isAutomatic = isAutomatic;

        }

        @Override

        public Object getDefaultValue() {

            return defaultValue;

        }

        @Override

        public void setDefaultValue(Object defaultValue) {

            this.defaultValue = defaultValue;

        }

        @Override

        public int getGeometryType() {

            return geom_type;

        }

        @Override

        public void setGeometryType(int geom_type) {

            this.geom_type = geom_type;

        }

        @Override

        public int getGeometrySubtype() {

            return geom_subtype;

        }

        @Override

        public void setGeometrySubtype(int geom_subtype) {

            this.geom_subtype = geom_subtype;

        }

        @Override

        public Object getGeometrySRSId() {

            return geom_srsdbcode;

        }

        @Override

        public void setGeometrySRSId(Object geom_srsid) {

            this.geom_srsdbcode = geom_srsid;

        }        

        @Override

        public boolean isGeometry() {

            return this.type == DataTypes.GEOMETRY;

        }

    }

    public class VariableBase extends AbstractValue implements Variable {

        protected String name;

        protected ColumnDescriptor descriptor;

        public VariableBase(ColumnDescriptor descriptor) {

            this.descriptor = descriptor;

            this.name = descriptor.getName();

        }

        public VariableBase(String name) {

            this.descriptor = null;

            this.name = name;

        }

        @Override

        public ColumnDescriptor getDescriptor() {

            return descriptor;

        }

        @Override

        public String getName() {

            return this.name;

        }

        @Override

        public String toString() {

            return identifier(this.name);

        }

        @Override

        public int compareTo(Variable o) {

            return this.name.compareTo(o.getName());

        }

        @Override

        public boolean equals(Object obj) {

            if (!(obj instanceof Variable)) {

                return false;

            }

            return this.name.equals(((Variable) obj).getName());

        }

        @Override

        public int hashCode() {

            int hash = 7;

            hash = 37 * hash + Objects.hashCode(this.name);

            return hash;

        }

    }

    public class ParameterBase extends AbstractValue implements Parameter {

        protected String name;

        protected Object value;

        protected ParameterType type;

        protected Value srs;

        public ParameterBase() {

            this.type = ParameterType.Constant;

            this.name = null;

            this.value = null;

        }

        @Override

        public void accept(Visitor visitor, VisitorFilter filter) {

            super.accept(visitor, filter);

            if (this.srs != null) {

                this.srs.accept(visitor, filter);

            }

        }

        @Override

        public Parameter as_geometry_variable() {

            this.type = ParameterType.Geometry;

            if (this.value == null && this.name != null) {

                this.value = this.name;

            }

            return this;

        }

        @Override

        public Parameter as_constant() {

            this.type = ParameterType.Constant;

            if (this.value == null && this.name != null) {

                this.value = this.name;

            }

            return this;

        }

        @Override

        public Parameter as_variable() {

            this.type = ParameterType.Variable;

            if (this.value != null && this.name == null) {

                this.name = (String) this.value;

            }

            return this;

        }

        @Override

        public Parameter srs(Value srs) {

            this.srs = srs;

            if( this.type == ParameterType.Variable ) {

                this.type = ParameterType.Geometry;

            }

            return this;

        }

        @Override

        public Parameter srs(IProjection srs) {

            this.srs = constant(getSRSId(srs));

            if( this.type == ParameterType.Variable ) {

                this.type = ParameterType.Geometry;

            }

            return this;

        }

        @Override

        public String getName() {

            switch (this.type) {

                case Variable:

                case Geometry:

                    return this.name;

                case Constant:

                    if (this.value == null) {

                        return null;

                    }

                    return this.value.toString();

                default:

                    if (this.name != null) {

                        return this.name;

                    }

                    if (this.value != null) {

                        return this.value.toString();

                    }

                    return null;

            }

        }

        @Override

        public boolean is_constant() {

            return this.type == ParameterType.Constant;

        }

        @Override

        public boolean is_geometry_variable() {

            return this.type == ParameterType.Geometry;

        }

        @Override

        public boolean is_variable() {

            return this.type == ParameterType.Variable;

        }

        @Override

        public Parameter value(Object value) {

            this.value = value;

            return this;

        }

        @Override

        public Parameter name(String name) {

            this.type = ParameterType.Variable;

            this.name = name;

            return this;

        }

        @Override

        public Object getValue() {

            try {

                switch (this.type) {

                    case Constant:

                        if (this.value instanceof Geometry) {

                            switch (config.getGeometryTypeSupport()) {

                                case EWKB:

                                    return bytearray(((Geometry) this.value).convertToEWKB());

                                case NATIVE:

                                case WKB:

                                    return bytearray(((Geometry) this.value).convertToWKB());

                                case WKT:

                                default:

                                    return ((Geometry) this.value).convertToWKT();

                            }

                        } else if (this.value instanceof IProjection) {

                            return getSRSId((IProjection) this.value);

                        }

                        return this.value;

                    case Variable:

                    case Geometry:

                    default:

                        return this.value;

                }

            } catch (Exception ex) {

                throw new RuntimeException("Can't get value from parameter.", ex);

            }

        }

        @Override

        public ParameterType getType() {

            return this.type;

        }

        @Override

        public Value getSRS() {

            return this.srs;

        }

        @Override

        public String toString() {

            switch (this.type) {

                case Constant:

                case Variable:

                default:

                    return "?";

                case Geometry:

                    switch (config.getGeometryTypeSupport()) {

                        case EWKB:

                            return MessageFormat.format(

                                    config.getString(Config.ST_GeomFromEWKB),

                                    "?",

                                    String.valueOf(this.srs.toString())

                            );

                        case WKB:

                            return MessageFormat.format(

                                    config.getString(Config.ST_GeomFromWKB),

                                    "?",

                                    String.valueOf(this.srs.toString())

                            );

                        case WKT:

                        default:

                            return MessageFormat.format(

                                    config.getString(Config.ST_GeomFromText),

                                    "?",

                                    String.valueOf(this.srs.toString())

                            );

                    }

            }

        }

    }

    public class ConstantBase extends AbstractValue implements Constant {

        protected Object value;

        public ConstantBase(Object value) {

            this.value = value;

        }

        @Override

        public Object getValue() {

            return this.value;

        }

        @Override

        public String toString() {

            if (this.value instanceof String) {

                return string((String) this.value);

            }

            if (this.value instanceof Boolean) {

                if (((Boolean) this.value)) {

                    return config.getString(Config.constant_true);

                } else {

                    return config.getString(Config.constant_false);

                }

            }

            return ObjectUtils.toString(this.value, "");

        }

    }

    public class CustomBase extends AbstractValue implements Custom {

        protected Object value;

        // Esto es para permitir declarar parametros y columnas en una seccion

        // custom.

        protected List<Value> values;

        public CustomBase(Object value) {

            this.value = value;

        }

        @Override

        public void accept(Visitor visitor, VisitorFilter filter) {

            super.accept(visitor, filter);

            if (this.values != null) {

                for (Value theValue : values) {

                    theValue.accept(visitor, filter);

                }

            }

        }

        @Override

        public Object getValue() {

            return this.value;

        }

        @Override

        public Custom add(Variable variable) {

            if (this.values == null) {

                this.values = new ArrayList<>();

            }

            this.values.add(variable);

            return this;

        }

        @Override

        public Custom add(Parameter parameter) {

            if (this.values == null) {

                this.values = new ArrayList<>();

            }

            this.values.add(parameter);

            return this;

        }

        @Override

        public String toString() {

            return ObjectUtils.toString(this.value, "");

        }

    }

    public class GeometryValueBase extends AbstractValue implements GeometryValue {

        protected Geometry geometry;

        protected IProjection projection;

        public GeometryValueBase(Geometry geometry, IProjection projection) {

            this.geometry = geometry;

            this.projection = projection;

        }

        @Override

        public Geometry getGeometry() {

            return this.geometry;

        }

        @Override

        public IProjection getSRS() {

            return this.projection;

        }

        @Override

        public String toString() {

            try {

                switch (config.getGeometryTypeSupport()) {

                    case EWKB:

                        return MessageFormat.format(

                                config.getString(Config.ST_GeomFromEWKB),

                                bytearray(this.geometry.convertToEWKB()),

                                String.valueOf(getSRSId(this.projection))

                        );

                    case WKB:

                        return MessageFormat.format(

                                config.getString(Config.ST_GeomFromWKB),

                                bytearray(this.geometry.convertToWKB()),

                                String.valueOf(getSRSId(this.projection))

                        );

                    case WKT:

                    default:

                        return MessageFormat.format(

                                config.getString(Config.ST_GeomFromText),

                                string(this.geometry.convertToWKT()),

                                String.valueOf(getSRSId(this.projection))

                        );

                }

            } catch (Exception ex) {

                throw new RuntimeException("Can't convert geometry to string.", ex);

            }

        }

    }

    public class FunctionBase extends AbstractValue implements Function {

        protected String name;

        protected String format;

        protected List<Value> parameters;

        public FunctionBase(String name, String format) {

            this.name = name;

            this.format = format;

        }

        @Override

        public List<Value> parameters() {

            if (this.parameters == null) {

                this.parameters = new ArrayList<>();

            }

            return this.parameters;

        }

        @Override

        public Function parameter(Value parameter) {

            this.parameters().add(parameter);

            return this;

        }

        @Override

        public String getName() {

            return this.name;

        }

        @Override

        public void accept(Visitor visitor, VisitorFilter filter) {

            super.accept(visitor, filter);

            for (Value value : this.parameters) {

                value.accept(visitor, filter);

            }

        }

        @Override

        public String toString() {

            if (this.parameters != null && !this.parameters.isEmpty()) {

                List<String> values = new ArrayList<>();

                for (Value value : this.parameters) {

                    values.add(value.toString());

                }

                return MessageFormat.format(format, values.toArray());

            } else {

                return this.format;

            }

        }

    }

    public class BinaryOperatorBase extends AbstractValue implements BinaryOperator {

        protected String name;

        protected String format;

        protected Value left;

        protected Value right;

        public BinaryOperatorBase(String name, String format) {

            this.name = name;

            this.format = format;

        }

        @Override

        public String getName() {

            return this.name;

        }

        @Override

        public void accept(Visitor visitor, VisitorFilter filter) {

            super.accept(visitor, filter);

            this.left.accept(visitor, filter);

            this.right.accept(visitor, filter);

        }

        @Override

        public BinaryOperator setLeft(Value operand) {

            this.left = operand;

            return this;

        }

        @Override

        public BinaryOperator setRight(Value operand) {

            this.right = operand;

            return this;

        }

        @Override

        public Value getLeft() {

            return this.left;

        }

        @Override

        public Value getRight() {

            return this.right;

        }

        @Override

        public String toString() {

            return MessageFormat.format(

                    format,

                    this.left.toString(),

                    this.right.toString()

            );

        }

    }

    protected Value value;

    protected Config config;

    public DefaultExpressionBuilder() {

        this.config = new ConfigBase();

    }

    @Override

    public ExpressionBuilder createExpressionBuilder() {

        return new DefaultExpressionBuilder();

    }

    @Override

    public Config getConfig() {

        return this.config;

    }

    @Override

    public Value getValue() {

        return this.value;

    }

    @Override

    public ExpressionBuilder setValue(Value value) {

        this.value = value;

        return this;

    }

    @Override

    public String toString() {

        return this.value.toString();

    }

    @Override

    public void accept(Visitor visitor, VisitorFilter filter) {

        if( this.value == null) {

            return;

        }

        this.value.accept(visitor, filter);

    }

    @Override

    public boolean has_spatial_functions() {

        return this.config.getBoolean(Config.has_spatial_functions);

    }

    @Override

    public GeometrySupportType geometry_support_type() {

        return (GeometrySupportType) this.config.get(Config.geometry_type_support);

    }

    @Override

    public String string(String s) {

        String quote = this.config.getString(Config.quote_for_strings);

//        No se porque no esta disponible wrapIfMissing

//        return StringUtils.wrapIfMissing(s,quote);

        if (s.startsWith(quote)) {

            return s;

        }

        return quote + s + quote;

    }

    @Override

    public String identifier(String id) {

        String quote = this.config.getString(Config.quote_for_identifiers);

//        No se porque no esta disponible wrapIfMissing

//        return StringUtils.wrapIfMissing(id,quote);

        if (id.startsWith(quote)) {

            return id;

        }

        return quote + id + quote;

    }

    @Override

    public String bytearray(byte[] data) {

        return "DECODE('"+bytearray_hex(data)+"','hex')";

    }

    @Override

    public String bytearray_hex(byte[] data) {

        StringBuilder builder = new StringBuilder();

        for (byte abyte : data) {

            int v = abyte & 0xff;

            builder.append(String.format("%02x", v));

        }

        return builder.toString();

    }

    @Override

    public String bytearray_0x(byte[] data) {

        return "0x" + bytearray_hex(data);

    }

    @Override

    public String bytearray_x(byte[] data) {

        return "x'" + bytearray_hex(data) + "'";

    }

    @Override

    public Object getSRSId(IProjection projection) {

        if( projection==null ) {

            return 0;

        }

        return ProjectionUtils.getCode(projection);

    }

    @Override

    public Constant srs(IProjection projection) {

        return constant(getSRSId(projection));

    }

    @Override

    public Variable variable(String name) {

        return new VariableBase(name);

    }

    @Override

    public Variable column(String name) {

        return new VariableBase(name);

    }

    @Override

    public Parameter parameter(String name) {

        Parameters parameters = this.getParameters();

        Parameter parameter = parameters.get(name);

        if( parameter != null ) {

            return parameter;

        }

        parameter = this.parameter();

        parameter.name(name);

        return parameter;

    }

    @Override

    public Parameter parameter() {

        return new ParameterBase();

    }

    @Override

    public Constant constant(Object value) {

        return new ConstantBase(value);

    }

    @Override

    public Group group(Value value) {

        return new GroupBase(value);

    }

    @Override

    public GeometryValue geometry(Geometry geom, IProjection projection) {

        return new GeometryValueBase(geom, projection);

    }

    @Override

    public GeometryValue geometry(Geometry geom) {

        if( geom.getProjection()==null ) {

            throw new IllegalArgumentException("The geometry does not have an associated projection. Use 'geometry(Geometry, IProjection)'.");

        }

        return new GeometryValueBase(geom, geom.getProjection());

    }

    @Override

    public GeometryValue envelope(Envelope envelope, IProjection projection) {

        return new GeometryValueBase(envelope.getGeometry(), projection);

    }

    @Override

    public GeometryValue envelope(Envelope envelope) {

        if( envelope.getProjection()==null ) {

            throw new IllegalArgumentException("The envelope does not have an associated projection. Use 'envelope(Geometry, IProjection)'.");

        }

        return new GeometryValueBase(envelope.getGeometry(), envelope.getProjection());

    }

    @Override

    public Custom custom(Object value) {

        return new CustomBase(value);

    }

    public Function function(String name, String format, Value... values) {

        FunctionBase func = new FunctionBase(name, format);

        for (Value theValue : values) {

            func.parameter(theValue);

        }

        return func;

    }

    public BinaryOperator binaryOperator(String name, String format, Value leftOperand, Value rightOperand) {

        BinaryOperator operator = new BinaryOperatorBase(name, format);

        operator.setLeft(leftOperand);

        operator.setRight(rightOperand);

        return operator;

    }

    @Override

    public List<Variable> getVariables() {

        final Set<Variable> vars = new HashSet<>();

        this.accept(new Visitor() {

            @Override

            public void visit(Visitable value) {

                vars.add((Variable) value);

            }

        }, new ClassVisitorFilter(Variable.class));

        List<Variable> lvars = new ArrayList<>(vars);

        Collections.sort(lvars);

        return lvars;

    }

    private static class ParametersBase extends ArrayList<Parameter> implements Parameters {

        private static final long serialVersionUID = -2188534574151780470L;

        public ParametersBase() {

            super();

        }

        public ParametersBase(Collection parameters) {

            super(parameters);

        }

        @Override

        public Parameter get(String name) {

            if( name == null ) {

                return null;

            }

            for (Parameter param : this) {

                if( param.is_variable() || param.is_geometry_variable() ) {

                    if( name.equalsIgnoreCase(param.getName()) ) {

                        return param;

                    }

                }

            }

            return null;

        }

        @Override

        public String toString() {

            boolean first = true;

            StringBuilder builder = new StringBuilder();

            builder.append("{ ");

            for (Parameter param : this) {

                if (!first) {

                    builder.append(", ");

                } else {

                    first = false;

                }

                String s;

                Object value = param.getValue();

                if (value == null) {

                    s = "null";

                } else if (value instanceof String) {

                    s = "'" + (String) value + "'";

                } else {

                    s = value.toString();

                }

                switch (param.getType()) {

                    case Constant:

                        builder.append(s);

                        break;

                    case Geometry:

                        builder.append("(Geometry)");

                    case Variable:

                    default:

                        builder.append(param.getName());

                        builder.append(": ");

                        builder.append(s);

                }

            }

            builder.append(" }");

            return builder.toString();

        }

    }

    @Override

    public Parameters getParameters() {

        final Parameters params = new ParametersBase();

        this.accept(new Visitor() {

            @Override

            public void visit(Visitable value) {

                params.add((Parameter) value);

            }

        }, new ClassVisitorFilter(Parameter.class));

        return params;

    }

    @Override

    public Function getAsGeometry(Value value) {

        return function("ST_AsBinary", config.getString(Config.ST_AsBinary), value);

    }

    @Override

    public ExpressionBuilder set(Value value) {

        this.value = value;

        return this;

    }

    @Override

    public ExpressionBuilder and(Value value) {

        if (this.value == null) {

            return this.set(value);

        }

        BinaryOperator operator = binaryOperator("AND", config.getString(Config.operator_AND), this.value, value);

        this.value = operator;

        return this;

    }

    @Override

    public ExpressionBuilder or(Value value) {

        if (this.value == null) {

            return this.set(value);

        }

        BinaryOperator operator = binaryOperator("OR", config.getString(Config.operator_OR), this.value, value);

        this.value = operator;

        return this;

    }

    @Override

    public Function ST_Intersects(Value geom1, Value geom2) {

        return function("ST_Intersects", config.getString(Config.ST_Intersects), geom1, geom2);

    }

    @Override

    public Function ST_SRID(Value geom) {

        return function("ST_SRID", config.getString(Config.ST_SRID), geom);

    }

    @Override

    public Function ST_Envelope(Value geom) {

        return function("ST_Envelope", config.getString(Config.ST_Envelope), geom);

    }

    @Override

    public Function ST_AsText(Value geom) {

        return function("ST_AsText", config.getString(Config.ST_AsText), geom);

    }

    @Override

    public Function ST_AsBinary(Value geom) {

        return function("ST_AsBinary", config.getString(Config.ST_AsBinary), geom);

    }

    @Override

    public Function ST_AsEWKB(Value geom) {

        return function("ST_AsEWKB", config.getString(Config.ST_AsEWKB), geom);

    }

    @Override

    public Function ST_GeomFromText(Value geom, Value crs) {

        return function("ST_GeomFromText", config.getString(Config.ST_GeomFromText), geom, crs);

    }

    @Override

    public Function ST_GeomFromWKB(Value geom, Value crs) {

        return function("ST_GeomFromWKB", config.getString(Config.ST_GeomFromWKB), geom, crs);

    }

    @Override

    public Function ST_GeomFromEWKB(Value geom, Value crs) {

        return function("ST_GeomFromEWKB", config.getString(Config.ST_GeomFromEWKB), geom, crs);

    }

    @Override

    public Function ST_Simplify(Value geom, Value tolerance) {

        return function("ST_Simplify", config.getString(Config.ST_Simplify), tolerance);

    }

    @Override

    public Function ST_Disjoint(Value geom1, Value geom2) {

        return function("ST_Disjoint", config.getString(Config.ST_Disjoint), geom1, geom2);

    }

    @Override

    public Function ST_Contains(Value geom1, Value geom2) {

        return function("ST_Contains", config.getString(Config.ST_Contains), geom1, geom2);

    }

    @Override

    public Function ST_Equals(Value geom1, Value geom2) {

        return function("ST_Equals", config.getString(Config.ST_Equals), geom1, geom2);

    }

    @Override

    public Function ST_Crosses(Value geom1, Value geom2) {

        return function("ST_Crosses", config.getString(Config.ST_Crosses), geom1, geom2);

    }

    @Override

    public Function ST_IsClosed(Value geom) {

        return function("ST_IsClosed", config.getString(Config.ST_IsClosed), geom);

    }

    @Override

    public Function ST_Overlaps(Value geom1, Value geom2) {

        return function("ST_Overlaps", config.getString(Config.ST_Overlaps), geom1, geom2);