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/*
* This file is part of rasdaman community.
*
* Rasdaman community is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Rasdaman community 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with rasdaman community. If not, see <http://www.gnu.org/licenses/>.
*
* Copyright 2003 - 2010 Peter Baumann / rasdaman GmbH.
*
* For more information please see <http://www.rasdaman.org>
* or contact Peter Baumann via <baumann@rasdaman.com>.
*/
package petascope.wcps.server.core;
import petascope.exceptions.WCPSException;
import org.w3c.dom.*;
public class NumericScalarExpr implements IRasNode {
private IRasNode first, second;
private String op, value;
private boolean twoChildren;
private double dvalue;
public NumericScalarExpr(Node node, XmlQuery xq) throws WCPSException {
twoChildren = false;
String nodeName = node.getNodeName();
op = "";
System.err.println("Trying to parse numeric scalar expression ...");
while ((node != null) && node.getNodeName().equals("#text")) {
node = node.getNextSibling();
}
if (nodeName.equals("numericConstant")) {
twoChildren = false;
op = code(nodeName);
value = node.getFirstChild().getNodeValue();
try {
dvalue = Double.parseDouble(value);
} catch (NumberFormatException e) {
throw new WCPSException("Could not understand constant: " + value);
}
} else if (nodeName.equals("complexConstant")
|| nodeName.equals("condense")
|| nodeName.equals("reduce")) {
op = code(nodeName);
twoChildren = false;
if (nodeName.equals("complexConstant")) {
first = new ComplexConstant(node, xq);
}
if (nodeName.equals("condense")) {
first = new CondenseScalarExpr(node, xq);
}
if (nodeName.equals("reduce")) {
first = new ReduceScalarExpr(node, xq);
}
} else if (nodeName.equals("numericUnaryMinus")
|| nodeName.equals("numericSqrt")
|| nodeName.equals("numericAbs")) {
op = code(nodeName);
twoChildren = false;
first = new NumericScalarExpr(node.getFirstChild(), xq);
} else if (nodeName.equals("numericAdd")
|| nodeName.equals("numericMinus")
|| nodeName.equals("numericMult")
|| nodeName.equals("numericDiv")) {
try {
op = code(nodeName);
twoChildren = true;
Node child = node.getFirstChild();
first = new NumericScalarExpr(child, xq);
second = new NumericScalarExpr(child.getNextSibling(), xq);
} catch (WCPSException e) {
System.err.println("Failed to parse a numeric expression pair !");
}
} else if (nodeName.equals("variableRef")) {
try {
op = code(nodeName);
twoChildren = false;
first = new VariableReference(node, xq);
System.err.println("Matched variable reference: " + first.toRasQL());
} catch (WCPSException e) {
System.err.println("Failed to match variable reference: "
+ e.toString());
}
} else {
throw new WCPSException("Unexpected Numeric Scalar Expression node : "
+ node.getNodeName());
}
}
public String toRasQL() {
String result = "";
if (twoChildren == false)
{
if (op.equals("variable")) {
result = first.toRasQL();
} else if (op.equals("value")) {
result = value;
} else if (op.equals("-")) {
result = "-" + first.toRasQL();
} else if (op.equals("sqrt")) {
result = "sqrt(" + first.toRasQL() + ")";
} else if (op.equals("child")) {
result = first.toRasQL();
} else if (op.equals("abs")) {
result = "abs(" + first.toRasQL() + ")";
}
}else if (twoChildren == true) {
result = "(" + first.toRasQL() + ")" + op
+ "(" + second.toRasQL() + ")";
} else {
return " error ";
}
return result;
}
private String code(String name) {
String op = "";
if (name.equals("numericConstant")) {
op = "value";
}
if (name.equals("numericUnaryMinus") || name.equals("numericMinus")) {
op = "-";
}
if (name.equals("numericAdd")) {
op = "+";
}
if (name.equals("numericMult")) {
op = "*";
}
if (name.equals("numericDiv")) {
op = "/";
}
if (name.equals("numericSqrt")) {
op = "sqrt";
}
if (name.equals("numericAbs")) {
op = "abs";
}
if (name.equals("condense") || name.equals("reduce")
|| name.equals("complexConstant")) {
op = "child";
}
if (name.equals("variableRef")) {
op = "variable";
}
return op;
}
public boolean isSingleValue() {
return op.equals("value");
}
public double getSingleValue() {
return dvalue;
}
}
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