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 *  or more contributor license agreements.  See the NOTICE file
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 *  to you under the Apache License, Version 2.0 (the
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package org.apache.cayenne.exp.parser;

import java.math.BigDecimal;
import java.util.Collection;
import java.util.Iterator;

import org.apache.cayenne.exp.Expression;
import org.apache.cayenne.util.ConversionUtil;

/**
 * "Multiply" expression.
 * 
 * @since 1.1
 * @author Andrei Adamchik
 */
public class ASTMultiply extends SimpleNode {
    ASTMultiply(int id) {
        super(id);
    }

    public ASTMultiply() {
        super(ExpressionParserTreeConstants.JJTMULTIPLY);
    }

    public ASTMultiply(Object[] nodes) {
        super(ExpressionParserTreeConstants.JJTMULTIPLY);
        int len = nodes.length;
        for (int i = 0; i < len; i++) {
            jjtAddChild(wrapChild(nodes[i]), i);
        }
    }

    public ASTMultiply(Collection nodes) {
        super(ExpressionParserTreeConstants.JJTMULTIPLY);
        int len = nodes.size();
        Iterator it = nodes.iterator();
        for (int i = 0; i < len; i++) {
            jjtAddChild(wrapChild(it.next()), i);
        }
    }

    protected Object evaluateNode(Object o) throws Exception {
        int len = jjtGetNumChildren();
        if (len == 0) {
            return null;
        }

        BigDecimal result = null;
        for (int i = 0; i < len; i++) {
            BigDecimal value = ConversionUtil.toBigDecimal(evaluateChild(i, o));

            if (value == null) {
                return null;
            }

            result = (i == 0) ? value : result.multiply(value);
        }

        return result;
    }

    /**
     * Creates a copy of this expression node, without copying children.
     */
    public Expression shallowCopy() {
        return new ASTMultiply(id);
    }

    protected String getExpressionOperator(int index) {
        return "*";
    }

    public int getType() {
        return Expression.MULTIPLY;
    }

    public void jjtClose() {
        super.jjtClose();
        flattenTree();
    }
}