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A Java library for rendering forms that are compliant with ODK XForms spec

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/*
 * Copyright (C) 2009 JavaRosa
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */

package org.javarosa.xpath.parser.ast;

import java.util.Vector;

import org.javarosa.xpath.expr.XPathExpression;
import org.javarosa.xpath.expr.XPathNumNegExpr;
import org.javarosa.xpath.expr.XPathUnaryOpExpr;
import org.javarosa.xpath.parser.Token;
import org.javarosa.xpath.parser.XPathSyntaxException;

public class ASTNodeUnaryOp extends ASTNode {
    public ASTNode expr;
    public int op;

    public Vector getChildren () {
        Vector v = new Vector();
        v.addElement(expr);
        return v;
    }

    public XPathExpression build() throws XPathSyntaxException {
        XPathUnaryOpExpr x;
        if (op == Token.UMINUS) {
            x = new XPathNumNegExpr(expr.build());
        } else {
            throw new XPathSyntaxException();
        }
        return x;
    }
}