Application: gvSIG desktop

package org.gvsig.fmap.dal.store.h2.expressionbuilderformatter;

import java.text.MessageFormat;

import org.gvsig.expressionevaluator.ExpressionBuilder;

import org.gvsig.expressionevaluator.ExpressionBuilder.Value;

import org.gvsig.expressionevaluator.Formatter;

import org.gvsig.fmap.dal.SQLBuilder;

import org.gvsig.fmap.geom.Geometry;

import org.gvsig.fmap.geom.GeometryUtils;

/**

 *

 * @author jjdelcerro

 */

public class Constant implements Formatter<Value> {

    private static final String FORMAT_ST_GEOMFROMWKB = "ST_GeomFromWKB(({0}), ({1}))";

    private static final String FORMAT_ST_GEOMFROMEWKB = "ST_GeomFromEWKB(({0}), ({1}))";

    private final SQLBuilder sqlbuilder;

    private final Formatter<Value> formatter;

    public Constant(SQLBuilder sqlbuilder, Formatter<Value> formatter) {

        this.sqlbuilder = sqlbuilder;

        this.formatter = formatter;

    }

    @Override

    public boolean canApply(ExpressionBuilder.Value value) {

        if (value instanceof ExpressionBuilder.Constant) {

            Object x = ((ExpressionBuilder.Constant)value).value();

            if( x instanceof byte[] ) {

                return true;

            }

            if( x instanceof Geometry ) {

                return true;

            }

        }

        return false;

    }

    @Override

    public String format(Value constant) {

        Object x = ((ExpressionBuilder.Constant)constant).value();

        ExpressionBuilder builder = this.sqlbuilder.expression();

        if( x instanceof byte[] ) {

            return builder.bytearray_x((byte[]) x);

        }

        if( x instanceof Geometry ) {

            Geometry geometry = (Geometry) x;

            switch (builder.geometry_support_type()) {

                case EWKB:

                    return MessageFormat.format(

                            FORMAT_ST_GEOMFROMEWKB,

                            builder.bytearray_x(GeometryUtils.toEWKB(geometry)),

                            String.valueOf(builder.srs_id(geometry.getProjection()))

                    );

                case WKB:

                    return MessageFormat.format(

                            FORMAT_ST_GEOMFROMWKB,

                            builder.bytearray_x(GeometryUtils.toWKB(geometry)),

                            String.valueOf(builder.srs_id(geometry.getProjection()))

                    );

                case WKT:

                default:

                    return constant.toString(null);

            }

        }

        return null;

    }

}