/*
* GeoTools - The Open Source Java GIS Toolkit
* http://geotools.org
*
* (C) 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.xacml.geoxacml.cond;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import com.sun.xacml.EvaluationCtx;
import com.sun.xacml.attr.AttributeValue;
import com.sun.xacml.attr.DoubleAttribute;
import com.sun.xacml.attr.StringAttribute;
import com.sun.xacml.cond.EvaluationResult;
import com.sun.xacml.cond.Expression;
/**
* Converts untis to metres
*
* @author Christian Mueller
*
*/
public class ConvertToMetre extends ConvertFunction {
public static final String NAME = NAME_PREFIX + "convert-to-metre";
private static Map<String, Double> UnitToMetre;
static {
UnitToMetre = new HashMap<String, Double>();
UnitToMetre.put("ångström", 1.0E-10);
UnitToMetre.put("Å", 1.0E-10);
UnitToMetre.put("ua", 1.495979E+11);
UnitToMetre.put("chain", 2.011684E+01);
UnitToMetre.put("fathom", 1.828804E+00);
UnitToMetre.put("fermi", 1.0E-15);
UnitToMetre.put("ft", 3.048E-01);
UnitToMetre.put("ft 7", 3.048006E-01);
UnitToMetre.put("in", 2.54E-02);
UnitToMetre.put("K", 1E+02);
UnitToMetre.put("light year", 9.46073E+15);
UnitToMetre.put("microinch", 2.54E-08);
UnitToMetre.put("micron", 1.0E-06);
UnitToMetre.put("μ", 1.0E-06);
UnitToMetre.put("mil", 2.54E-05);
UnitToMetre.put("mi", 1.609344E+03);
UnitToMetre.put("mi 7", 1.609347E+03);
UnitToMetre.put("mile nautical", 1.852E+03);
UnitToMetre.put("pc", 3.085678E+16);
UnitToMetre.put("pica computer", 4.233333E-03);
UnitToMetre.put("pica printer", 4.217518E-03);
UnitToMetre.put("point computer", 3527778E-04);
UnitToMetre.put("point printer", 3.514598E-04);
UnitToMetre.put("rd 7", 5.029210E+00);
UnitToMetre.put("yd", 9.144E-01);
}
public ConvertToMetre() {
super(NAME);
}
public EvaluationResult evaluate(List<? extends Expression> inputs, EvaluationCtx context) {
AttributeValue[] argValues = new AttributeValue[inputs.size()];
EvaluationResult result = evalArgs(inputs, context, argValues);
if (result != null)
return result;
DoubleAttribute value = (DoubleAttribute) (argValues[0]);
StringAttribute unit = (StringAttribute) (argValues[1]);
Double multiplyBy = UnitToMetre.get(unit.getValue());
if (multiplyBy == null) {
exceptionError(new Exception("Unit" + unit + " not supported"));
}
double resultValue = value.getValue() * multiplyBy;
return new EvaluationResult(new DoubleAttribute(resultValue));
}
}