CRSModel.java

/* Copyright (c) 2001 - 2007 TOPP - www.openplans.org. All rights reserved.
 * This code is licensed under the GPL 2.0 license, available at the root
 * application directory.
 */
package org.geoserver.web.wicket;

import org.apache.wicket.model.IModel;
import org.geotools.referencing.CRS;
import org.opengis.referencing.crs.CoordinateReferenceSystem;

/**
 * Model wrapper for {@link CoordinateReferenceSystem} instances.
 * <p>
 * This model operates by persisting the wkt ({@link CoordinateReferenceSystem#toWKT()}) for
 * a crs.
 * </p>
 * @author Justin Deoliveira, OpenGeo
 *
 */
public class CRSModel implements IModel {

    transient CoordinateReferenceSystem crs;
    String wkt;
    
    public CRSModel(CoordinateReferenceSystem crs) {
        setObject(crs);
    }

    public CoordinateReferenceSystem getObject() {
        if ( crs != null ) {
            return crs;
        }
        
        try {
            crs = CRS.parseWKT( wkt );
            return crs;
        } 
        catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

    public void setObject(Object object) {
        this.crs = (CoordinateReferenceSystem )object;
        this.wkt = crs != null ? crs.toWKT() : null;
    }

    public void detach() {
        crs = null;
    }
}